XMLHttpRequest - Web APIs
xmlhttprequest (xhr) objects are used to interact with servers. you can retrieve data from a url without having to do a full page refresh. this enables a web page to update just part of a page without disrupting what the user is doing. xmlhttprequest is used heavily in ajax programming. <div id="interfacediagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 23.076923076923077%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 650 150" preserveaspectratio="xminymin meet"><a xlink:href="/docs/web/api/eventtarget" target="_top"><rect x="1" y="1" width="110" height="50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="56" y="30" font-size="12px" font-family="consolas,mo...
...fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="56" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">eventtarget</text></a><polyline points="111,25 121,20 121,30 111,25" stroke="#d4dde4" fill="none"/><line x1="121" y1="25" x2="151" y2="25" stroke="#d4dde4"/><a xlink:href="/docs/web/api/xmlhttprequesteventtarget" target="_top"><rect x="151" y="1" width="250" height="50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="276" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">xmlhttprequesteventtarget</text></a><polyline points="401,25 411,20 411,30 401,25" stroke="#d4dde4" fill="none"/><line x1...
...oke="#d4dde4" stroke-width="2px" /><text x="276" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">xmlhttprequesteventtarget</text></a><polyline points="401,25 411,20 411,30 401,25" stroke="#d4dde4" fill="none"/><line x1="411" y1="25" x2="441" y2="25" stroke="#d4dde4"/><a xlink:href="/docs/web/api/xmlhttprequest" target="_top"><rect x="441" y="1" width="140" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="511" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">xmlhttprequest</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} despite its name, xmlhttprequest...
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PaymentRequest.show() - Web APIs
the paymentrequest interface's show() method instructs the user agent to begin the process of showing and handling the user interface for the payment request to the user. for security reasons, the paymentrequest.show() method can't just be initiated at any time. it may only be called while handling events that represent user interactions, such as click, keyup, or the like. only one payment request can be in the process of being handled at once, across all documents. once one paymentrequest's show() method has been called, any other call to show() will by rejected with an aborterror until the returned promise has been concluded, either by being fulfilled with a paymentresponse indicating the results of the payment request, or by being rejected with an error. note: in reality, despit...
... called, any other call to show() will by rejected with an aborterror until the returned promise has been concluded, either by being fulfilled with a paymentresponse indicating the results of the payment request, or by being rejected with an error. note: in reality, despite the fact that the specification says this can't be done, some browsers, including firefox, support multiple active payment requests at a time. if your architecture doesn't necessarily have all of the data ready to go at the moment it instantiates the payment interface by calling show(), specify the detailspromise parameter, providing a promise that is fulfilled once the data is ready. if this is provided, show() will not allow the user to interact with the payment interface until the promise is fulfilled, so that data can ...
...esult and, if necessary, calling paymentresponse.retry() to retry a failed payment can all be done either asynchronously or synchronously, depending on your needs. for the best user experience, asynchronous solutions are typically the best way to go. most examples on mdn and elsewhere use async/await to wait asynchronously while results are validated and so forth. syntax paymentpromise = paymentrequest.show(detailspromise); parameters detailspromise optional an optional promise that you can provide if your architecture requires that the payment request's details need to be updated between instantiating the payment interface and the user beginning to interact with it. the promise should resolve with a paymentdetailsupdate object containing the updated information. return value a promise...
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Request - Web APIs
the request interface of the fetch api represents a resource request. you can create a new request object using the request() constructor, but you are more likely to encounter a request object being returned as the result of another api operation, such as a service worker fetchevent.request. constructor request() creates a new request object. properties request.cache read only contains the cache mode of the request (e.g., default, reload, no-cache). request.context read only contains the context of the request (e.g., audio, image, iframe, etc.) request.credentials read only contains the credentials of the request (e.g., omit, same-origin, include). the default is same-origin. ...
... request() creates a new request object. properties request.cache read only contains the cache mode of the request (e.g., default, reload, no-cache). request.context read only contains the context of the request (e.g., audio, image, iframe, etc.) request.credentials read only contains the credentials of the request (e.g., omit, same-origin, include). the default is same-origin. request.destination read only returns a string from the requestdestination enum describing the request's destination. this is a string indicating the type of content being requested. request.headers read only contains the associated headers object of the request. ...
....credentials read only contains the credentials of the request (e.g., omit, same-origin, include). the default is same-origin. request.destination read only returns a string from the requestdestination enum describing the request's destination. this is a string indicating the type of content being requested. request.headers read only contains the associated headers object of the request. request.integrity read only contains the subresource integrity value of the request (e.g., sha256-bpfbw7ivv8q2jlit13fxdyae2tjllusrsz273h2nfse=). request.method read only contains the request's method (get, post, etc.) request.mode read only contains the mode of the request (e.g., cors, no-cors, same-origin, navigate.) request.redirect read only contains the mode for how redirects are handled. ...
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Request() - Web APIs
the request() constructor creates a new request object. syntax var myrequest = new request(input[, init]); parameters input defines the resource that you wish to fetch. this can either be: a usvstring containing the direct url of the resource you want to fetch. a request object, effectively creating a copy. note the following behavioural updates to retain security while making the constructor less likely to throw exceptions: if this object exists on another origin to the constructor call, the request.referrer is stripped out. if this object has a request.mode of navigate, the mode value is converted to same-origin. init optional an options object containing any custom settings that you want to apply to the request. the possible options are: method: the r...
...tor call, the request.referrer is stripped out. if this object has a request.mode of navigate, the mode value is converted to same-origin. init optional an options object containing any custom settings that you want to apply to the request. the possible options are: method: the request method, e.g., get, post. the default is get. headers: any headers you want to add to your request, contained within a headers object or an object literal with bytestring values. body: any body that you want to add to your request: this can be a blob, buffersource, formdata, urlsearchparams, usvstring, or readablestream object. note that a request using the get or head method cannot have a body. mode: the mode you want to use for the request, e.g., cors, no-cors, same-origin, or navigate. ...
... redirect: the redirect mode to use: follow, error, or manual. the default is follow. referrer: a usvstring specifying no-referrer, client, or a url. ...
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HTTP conditional requests - HTTP
http has a concept of conditional requests, where the result, and even the success of a request, can be changed by comparing the affected resources with the value of a validator. such requests can be useful to validate the content of a cache, and sparing a useless control, to verify the integrity of a document, like when resuming a download, or when preventing to lose updates when uploading or modifying a document on the server. principles http conditional requests are requests that are executed differently, depending on the value of specific headers. these headers define a precondition, and the result of the request will be different if the precondition is matched or not. ...
..., or when preventing to lose updates when uploading or modifying a document on the server. principles http conditional requests are requests that are executed differently, depending on the value of specific headers. these headers define a precondition, and the result of the request will be different if the precondition is matched or not. the different behaviors are defined by the method of the request used, and by the set of headers used for a precondition: for safe methods, like get, which usually tries to fetch a document, the conditional request can be used to send back the document, if relevant only. therefore, this spares bandwidth. ...
... or not. the different behaviors are defined by the method of the request used, and by the set of headers used for a precondition: for safe methods, like get, which usually tries to fetch a document, the conditional request can be used to send back the document, if relevant only. therefore, this spares bandwidth. for unsafe methods, like put, which usually uploads a document, the conditional request can be used to upload the document, only if the original it is based on is the same as that stored on the server. validators all conditional headers try to check if the resource stored on the server matches a specific version. to achieve this, the conditional requests need to indicate the version of the resource. as comparing the whole resource byte to byte is impracticable, and not always wha...
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imgIRequest
read only. decoderobserver imgidecoderobserver read only. image imgicontainer the image container. read only. ...
...read only. decoderobserver imgidecoderobserver read only. image imgicontainer the image container. read only. ...
...read only. decoderobserver imgidecoderobserver read only. image imgicontainer the image container. read only. ...
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HTML in XMLHttpRequest - Web APIs
the w3c xmlhttprequest specification adds html parsing support to xmlhttprequest, which originally supported only xml parsing. this feature allows web apps to obtain an html resource as a parsed dom using xmlhttprequest. to get an overview of how to use xmlhttprequest in general, see using xmlhttprequest. limitations to discourage the synchronous use of xmlhttprequest, html support is not available in the synchronous mode. also, html support is only available if the responsetype property has been set to "document". this limitation avoids wasting time parsing html uselessly when legacy code uses xmlhttprequest in the default mode to retrieve responsetext for text/html resources. also, this limitation avoids problems with legacy code that assumes that responsexml is null for http error pages (w...
... to "document". this limitation avoids wasting time parsing html uselessly when legacy code uses xmlhttprequest in the default mode to retrieve responsetext for text/html resources. also, this limitation avoids problems with legacy code that assumes that responsexml is null for http error pages (which often have a text/html response body). ...
...y when legacy code uses xmlhttprequest in the default mode to retrieve responsetext for text/html resources. also, this limitation avoids problems with legacy code that assumes that responsexml is null for http error pages (which often have a text/html response body). usage retrieving an html resource as a dom using xmlhttprequest works just like retrieving an xml resource as a dom using xmlhttprequest, except you can't use the synchronous mode and you have to explicitly request a document by assigning the string "document" to the responsetype property of the xmlhttprequest object after calling open() but before calling send(). ...
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XRSession.requestAnimationFrame() - Web APIs
this can be done from within the callback itself. the callback takes two parameters as inputs: an xrframe describing the state of all tracked objects for the session, and a time stamp you can use to compute any animation updates needed. you can cancel a previously scheduled animation by calling cancelanimationframe(). ...
...this can be done from within the callback itself. the callback takes two parameters as inputs: an xrframe describing the state of all tracked objects for the session, and a time stamp you can use to compute any animation updates needed. you can cancel a previously scheduled animation by calling cancelanimationframe(). ...
...this can be done from within the callback itself. the callback takes two parameters as inputs: an xrframe describing the state of all tracked objects for the session, and a time stamp you can use to compute any animation updates needed. you can cancel a previously scheduled animation by calling cancelanimationframe(). ...
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IDBRequest.error - Web APIs
constrainterror if you insert data that doesn't conform to a constraint. it's an exception type for creating stores and indexes. ...
... constrainterror if you insert data that doesn't conform to a constraint. it's an exception type for creating stores and indexes. ...
... constrainterror if you insert data that doesn't conform to a constraint. it's an exception type for creating stores and indexes. you get this error, for example, if you try to add a new key that already exists in the record. ...
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IDBRequest.transaction - Web APIs
if a version upgrade is needed when opening a database then during the upgradeneeded event handler the transaction property will be an idbtransaction with mode equal to "versionchange", and can be used to access existing object stores and indexes, or abort the the upgrade. following the upgrade, the transaction ​property will again be null. ...
...needed when opening a database then during the upgradeneeded event handler the transaction property will be an idbtransaction with mode equal to "versionchange", and can be used to access existing object stores and indexes, or abort the the upgrade. following the upgrade, the transaction ​property will again be null. note: this feature is available in web workers. ...
...ransaction property will be an idbtransaction with mode equal to "versionchange", and can be used to access existing object stores and indexes, or abort the the upgrade. following the upgrade, the transaction ​property will again be null. note: this feature is available in web workers. syntax var mytransaction = request.transaction; value an idbtransaction. example the following example requests a given record title, onsuccess gets the associated record from the idbobjectstore (made available as objectstoretitlerequest.result), updates one property of the record, and then puts the updated record back into the object store in another request. the source of the requests is logged to the developer console — both originate from the same transaction. for a full working example, see our to-...
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XMLHttpRequest.getAllResponseHeaders() - Web APIs
return value a bytestring representing all of the response's headers (except those whose field name is set-cookie or set-cookie2) separated by crlf, or null if no response has been received. if a network error happened, an empty string is returned. ...
... return value a bytestring representing all of the response's headers (except those whose field name is set-cookie or set-cookie2) separated by crlf, or null if no response has been received. if a network error happened, an empty string is returned. ...
... return value a bytestring representing all of the response's headers (except those whose field name is set-cookie or set-cookie2) separated by crlf, or null if no response has been received. if a network error happened, an empty string is returned. ...
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nsIXMLHttpRequest
obsolete since gecko 60 (firefox 60 / thunderbird 60 / seamonkey 2.57)this feature is obsolete. although it may still work in some browsers, its use is discouraged since it could be removed at any time. try to avoid using it. nsixmlhttprequest along with nsijsxmlhttprequest and nsixmlhttprequesteventtarget are mozilla's implementation details of the dom xmlhttprequest object. note: if you're a web developer or a mozilla add-on developer, please refer to the xmlhttprequest documentation instead. ...
...nsixmlhttprequesteventtarget are mozilla's implementation details of the dom xmlhttprequest object. note: if you're a web developer or a mozilla add-on developer, please refer to the xmlhttprequest documentation instead. this page contains documentation, specific to mozilla application and add-on developers. the interface definition: //github.com/realityripple/uxp/blob/master/dom/xhr/nsixmlhttprequest.idl elevated privileges as mentioned in the "non-standard properties" the property of channel was read-only. when using the xpcom interface, as seen below in example 2, we can get access to this. the most obvious benefit is that we can set nsirequest - constants in the xhr.channel.loadflags. for instance, as done in example 2, the flag of load_anonymous is added, this strips all user data (cook...
...hr.channel.loadflags. for instance, as done in example 2, the flag of load_anonymous is added, this strips all user data (cookies, tokens, etc). using event handlers from native code (not sure if it's up-to-date) from native code, the way to set up onload and onerror handlers is a bit different. here is a comment from johnny stenback <jst@netscape.com>: the mozilla implementation of nsixmlhttprequest implements the interface nsidomeventtarget and that's how you're supported to add event listeners. try something like this: nscomptr<nsidomeventtarget> target(do_queryinterface(myxmlhttpreq)); target->addeventlistener(ns_literal_string("load"), mylistener, pr_false) where mylistener is your event listener object that implements the interface nsidomeventlistener. the 'onload', 'onerror', and 'onre...
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LockManager.request() - Web APIs
the request() method of the lockmanager interface requests a lock object with parameters specifying its name and characteristics. the requested lock is passed to a callback, while the function itself returns a promise that resolves with undefined. the mode property of the options parameter may be either "exclusive" or "shared". request an "exclusive" lock when it should only be held by one code instance at a time. this applies to code in both tabs and workers. use this to represent mutually exclusive access to a resource. when an "exclusive" lock for a given name is held, no other lock with the same name can be held. request a "shared" lock when multiple instances of the code can share access to a resource. when a "shared" lock for a given name is held, other "shared" locks for the same nam...
... request a "shared" lock when multiple instances of the code can share access to a resource. when a "shared" lock for a given name is held, other "shared" locks for the same name can be granted, but no "exclusive" locks with that name can be held or granted. this shared/exclusive lock pattern is common in database transaction architecture, for example to allow multiple simultaneous readers (each requests a "shared" lock) but only one writer (a single "exclusive" lock). this is known as the readers-writer pattern. in the indexeddb api, this is exposed as "readonly" and "readwrite" transactions which have the same semantics. syntax lockmanager.request(var promise = name[, {options}], callback) parameters name an identifier for the lock you want to request. options optional an object descr...
...the default value is false. ...
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PaymentRequest.shippingOption - Web APIs
the shippingoption read-only attribute of the paymentrequest interface returns either the id of a selected shipping option, null (if no shipping option was set to be selected) or a shipping option selected by the user. it is initially null by when no "selected" shipping options are provided. this attribute is only populated if the constructor is called with the requestshipping flag set to true. if requestshipping was false (or missing), shippingoption returns null, even the developer provides a selected a shipping option. syntax // returns the id of the selected paymentshippingoption var shippingoption = request.shippingoption; example in the example below, the paymentrequest.onshippingoptionchange and the paymentrequest.onshippingaoptionchange events are dispatched. in each calls to ...
...ed paymentshippingoption var shippingoption = request.shippingoption; example in the example below, the paymentrequest.onshippingoptionchange and the paymentrequest.onshippingaoptionchange events are dispatched. in each calls to updatedetails() are made, one using a promise, and the other with a plain js object. this demotrates synchrounous and asynchronous updates to a payment sheet. ...
...ion var shippingoption = request.shippingoption; example in the example below, the paymentrequest.onshippingoptionchange and the paymentrequest.onshippingaoptionchange events are dispatched. in each calls to updatedetails() are made, one using a promise, and the other with a plain js object. this demotrates synchrounous and asynchronous updates to a payment sheet. ...
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nsIRequest
netwerk/base/nsirequest.idlscriptable this interface is used by the request initiator to control the request. inherits from: nsisupports last changed in gecko 1.9.1 (firefox 3.5 / thunderbird 3.0 / seamonkey 2.0) for example nsichannel typically passes itself as the nsirequest argument to the nsistreamlistener on each onstartrequest, ondataavaliable, and onstoprequest invocation. method overview void cancel(in nsresult astatus); boolean ispending(); void resume(); void suspend(); attributes attribute type description loadflags nsloadflags the load flags of this request. bits 0-15 are reserved. when added to a load group, this request's load flags are merged with the load flags of the load group. ...
... boolean ispending(); void resume(); void suspend(); attributes attribute type description loadflags nsloadflags the load flags of this request. bits 0-15 are reserved. when added to a load group, this request's load flags are merged with the load flags of the load group. loadgroup nsiloadgroup the load group of this request. while pending, the request is a member of the load group. it is the responsibility of the request to implement this policy. name autf8string the name of the request. often this is the uri of the request. read only. status nsresult the error status associated with the request. read only. constants various load flags which may be or'd together. const...
...do not deliver status notifications to the nsiprogresseventsink, or keep this load from completing the nsiloadgroup it may belong to. the following flags control the flow of data into the cache. constant value description inhibit_caching 1 << 7 this flag prevents caching of any kind. it does not, however, prevent cached content from being used to satisfy this request. inhibit_persistent_caching 1 << 8 this flag prevents caching on disk (or other persistent media), which may be needed to preserve privacy. for https, this flag is set automatically. the following flags control what happens when the cache contains data that could perhaps satisfy this request. they are listed in descending order of precedence. constant value d...
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BasicCardRequest - Web APIs
the basiccardrequest dictionary is a javascript object-structure that can be used in the payment request api. the properties of basiccardrequest are defined in the basic card payment spec). properties basiccardrequest.supportednetworks optional secure context an optional array of domstrings representing the card networks that the retailer supports (e.g. "amex", "mastercard"); see card network identifiers for a complete list. if the property is missing, it implies that all networks are supported. obsolete properties these properties have been removed from the payment method: basic card specification and should no longer be used. ...
...context an optional array of domstrings representing the card networks that the retailer supports (e.g. "amex", "mastercard"); see card network identifiers for a complete list. if the property is missing, it implies that all networks are supported. obsolete properties these properties have been removed from the payment method: basic card specification and should no longer be used. basiccardrequest.supportedtypes optional secure context this obsolete property was used to provide an optional array of domstrings representing the card types that the retailer supports (e.g. credit, debit, prepaid). if the property is missing, it implies that all the card types are supported. instead of using this property, it is up to the server to check support for the card given the information coded into ...
...s up to the server to check support for the card given the information coded into the account number. card network identifiers the w3c maintains an official list of approved card network identifier strings, which may be used in the supportednetworks list. those are: amex cartebancaire diners discover jcb mastercard mir unionpay visa examples in the following example, the paymentrequest() constructor is used to create a new payment request, which takes three objects as parameters — one containing details of the payment methods that can be used for the payment, one containing details of the actual order (such as items bought and shipping options), and an optional object that describes what data is needed to fullfil the payment (e.g., a shipping address). the first of these thr...
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Document.requestStorageAccess() - Web APIs
conditions for granting storage access storage access is granted based on a series of checks described here: if the document already has been granted access, resolve. if the document has a null origin, reject. if the document's frame is the main frame, resolve. if the sub frame's origin is equal to the main frame's, resolve. if the sub frame is not sandboxed, skip to step 7. if the sub frame doesn't have the token allow-storage-access-by-user-activation, reject. if the sub frame's parent frame is not the top frame, reject. if the browser is not processing a user gesture, reject. ...
... reject. check any additional rules that the browser has. examples: allow lists, block lists, on-device classification, user settings, anti-clickjacking heuristics, or prompting the user for explicit permission. reject if some rule is not fulfilled. ...
... anti-clickjacking heuristics, or prompting the user for explicit permission. reject if some rule is not fulfilled. grant the document access to cookies and other site storage and store that fact for the purposes of future calls to document.hasstorageaccess() and requeststorageaccess(). assuming all of the requirements above are satisfied, firefox will automatically grant storage access to the requesting origin on up to a threshold number of first-party origins in the current session for the duration of user’s session, up to a maximum of 24 hours. after the requesting origin has exceeded the maximum allowable number of storage access grants, any future call to requeststorageaccess() during the same browsing session will prompt the user. the maximum number of concurrent storage access grants...
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IDBOpenDBRequest - Web APIs
note: this feature is available in web workers. ...
... note: this feature is available in web workers. ...
...50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="56" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">eventtarget</text></a><polyline points="111,25 121,20 121,30 111,25" stroke="#d4dde4" fill="none"/><line x1="121" y1="25" x2="151" y2="25" stroke="#d4dde4"/><a xlink:href="/docs/web/api/idbrequest" target="_top"><rect x="151" y="1" width="100" height="50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="201" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">idbrequest</text></a><polyline points="251,25 261,20 261,30 251,25" stroke="#d4dde4" fill="none"/><line x1="261" y1="25" x2="291" y2...
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IDBRequest - Web APIs
the idbrequest interface of the indexeddb api provides access to results of asynchronous requests to databases and database objects using event handler attributes. each reading and writing operation on a database is done using a request. the request object does not initially contain any information about the result of the operation, but once information becomes available, an event is fired on the request, and the information becomes available through the properties of the idbrequest instance. all asynchronous operations immediately return an idbrequest instance. each request has a readystate that is set to the 'pending' state; this changes to 'done' when the request is completed or fails. ...
...ut once information becomes available, an event is fired on the request, and the information becomes available through the properties of the idbrequest instance. all asynchronous operations immediately return an idbrequest instance. each request has a readystate that is set to the 'pending' state; this changes to 'done' when the request is completed or fails. when the state is set to done, every request returns a result and an error, and an event is fired on the request. when the state is still pending, any attempt to access the result or error raises an invalidstateerror exception. in plain words, all asynchronous methods return a request object. ...
...hat is set to the 'pending' state; this changes to 'done' when the request is completed or fails. when the state is set to done, every request returns a result and an error, and an event is fired on the request. when the state is still pending, any attempt to access the result or error raises an invalidstateerror exception. in plain words, all asynchronous methods return a request object. if the request has been completed successfully, the result is made available through the result property and an event indicating success is fired at the request (idbrequest.onsuccess). if an error occurs while performing the operation, the exception is made available through the result property and an error event is fired (idbrequest.onerror). the interface idbopendbrequest is derived from idbrequest. note: t...
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PaymentRequest: paymentmethodchange event - Web APIs
paymentmethodchange events are delivered by the payment request api to a paymentrequest object when the user changes payment methods within a given payment handler. for example, if the user switches from one credit card to another on their apple pay account, a paymentmethodchange event is fired to let you know about the change. bubbles no cancelable no interface paymentmethodchangeevent event handler property onpaymentmethodchange examples let's take a look at an example. this code creates a new paymentrequest, adds a handler for the paymentmethodchange event by calling the request's addeventlistener(), then calls show() to present the payment interface to the user. the code assumes the existence of a method detailsforshipping(), which re...
...listener(), then calls show() to present the payment interface to the user. the code assumes the existence of a method detailsforshipping(), which returns a paymentdetailsupdate object containing the shipping options for the ground shipping method, in the form found in the paymentshippingoption dictionary. by doing so, the payment form defaults to the ground shipping method. ...
...t the payment interface to the user. the code assumes the existence of a method detailsforshipping(), which returns a paymentdetailsupdate object containing the shipping options for the ground shipping method, in the form found in the paymentshippingoption dictionary. by doing so, the payment form defaults to the ground shipping method. ...
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Payment Request API - Web APIs
the payment request api provides a consistent user experience for both merchants and users. it is not a new way for paying for things; rather, it's a way for users to select their preferred way of paying for things, and make that information available to a merchant. payment request concepts and usage many problems related to online shopping-cart abandonment can be traced to checkout forms, which can be difficult and time consuming to fill out and often require multiple steps to complete. the payment request api is meant to reduce the number of steps needed to complete a payment online, potentially doing away with checkout forms. it aims to make the checkout process easier, by remembering a user's details, which are then passed along to a merchant hopefully without requiring a html fo...
...they no longer have to fill out the same details repeatedly across different sites. ...
...when buying things. consistent error handling: the browser can check the validity of card numbers, and can tell the user if a card has expired (or is about to expire). the browser can automatically suggest which card to use based on past usage patterns or restrictions from the merchant (e.g, "we only accept visa or mastercard"), or allow the user to say which is their default/favorite card. to request a payment, a web page creates a paymentrequest object in response to a user action that initiates a payment, such as clicking a "purchase" button. the paymentrequest allows the web page to exchange information with the user agent while the user provides input to complete the transaction. you can find a complete guide in using the payment request api. note: the api is available inside cross-ori...
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Request.headers - Web APIs
the headers read-only property of the request interface contains the headers object associated with the request. syntax var myheaders = request.headers; value a headers object. ...
... the headers read-only property of the request interface contains the headers object associated with the request. syntax var myheaders = request.headers; value a headers object. ...
... the headers read-only property of the request interface contains the headers object associated with the request. syntax var myheaders = request.headers; value a headers object. ...
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XMLHttpRequestEventTarget - Web APIs
xmlhttprequesteventtarget is the interface that describes the event handlers you can implement in an object that will handle events for an xmlhttprequest. <div id="interfacediagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 11.666666666666666%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 70" preserveaspectratio="xminymin meet"><a xlink:href="/docs/web/api/eventtarget" target="_top"><rect x="1" y="1" width="110" height="50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="56" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">eventtarget</text></a><polyline points="11...
...fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="56" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">eventtarget</text></a><polyline points="111,25 121,20 121,30 111,25" stroke="#d4dde4" fill="none"/><line x1="121" y1="25" x2="151" y2="25" stroke="#d4dde4"/><a xlink:href="/docs/web/api/xmlhttprequesteventtarget" target="_top"><rect x="151" y="1" width="250" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="276" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">xmlhttprequesteventtarget</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties...
..." target="_top"><rect x="151" y="1" width="250" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="276" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">xmlhttprequesteventtarget</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties xmlhttprequesteventtarget.onabort contains the function to call when a request is aborted and the abort event is received by this object. ...
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XRSystem: requestSession() - Web APIs
the supported modes are: immersive-ar the session's output will be given exclusive access to the immersive device, but the rendered content will be blended with the real-world environment. the session's environmentblendmode indicates the method to be used to blend the content together. ...
...the supported modes are: immersive-ar the session's output will be given exclusive access to the immersive device, but the rendered content will be blended with the real-world environment. the session's environmentblendmode indicates the method to be used to blend the content together. ...
... inline sessions don't require special hardware and should be avalable on any user agent offering webxr api support. sessioninit optional a xrsessioninit object providing options to configure the new xrsession. see specifying session options for details on how to configure a webxr session. return value a promise that resolves with an xrsession object if the device and user agent support the requested mode and features. exceptions this method doesn't throw true exceptions; instead, it rejects the returned promise, passing into it a domexception whose name is one of the following: invalidstateerror the requested session mode is immersive-vr but there is already an immersive vr session either currently active or in the process of being set up. there can only be one immersive vr session a...
...And 7 more matches

HTTP range requests - HTTP
curl -i http://i.imgur.com/z4d4kwk.jpg http/1.1 200 ok ... accept-ranges: bytes content-length: 146515 in this response, accept-ranges: bytes indicates that bytes can be used as unit to define a range. here the content-length header is also useful as it indicates the full size of the image to retrieve. ...
... curl -i http://i.imgur.com/z4d4kwk.jpg http/1.1 200 ok ... accept-ranges: bytes content-length: 146515 in this response, accept-ranges: bytes indicates that bytes can be used as unit to define a range. here the content-length header is also useful as it indicates the full size of the image to retrieve. ...
... curl -i http://i.imgur.com/z4d4kwk.jpg http/1.1 200 ok ... accept-ranges: bytes content-length: 146515 in this response, accept-ranges: bytes indicates that bytes can be used as unit to define a range. here the content-length header is also useful as it indicates the full size of the image to retrieve. ...
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Preflight request - MDN Web Docs Glossary: Definitions of Web-related terms
a cors preflight request is a cors request that checks to see if the cors protocol is understood and a server is aware using specific methods and headers. it is an options request, using three http request headers: access-control-request-method, access-control-request-headers, and the origin header. a preflight request is automatically issued by a browser and in normal cases, front-end developers don't need to craft such requests themselves. it appears when request is qualified as "to be preflighted" and omitted for simple requests. ...
...access-control-request-method, access-control-request-headers, and the origin header. a preflight request is automatically issued by a browser and in normal cases, front-end developers don't need to craft such requests themselves. it appears when request is qualified as "to be preflighted" and omitted for simple requests. ...
...cess-control-request-headers, and the origin header. a preflight request is automatically issued by a browser and in normal cases, front-end developers don't need to craft such requests themselves. it appears when request is qualified as "to be preflighted" and omitted for simple requests. ...
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PaymentRequest.canMakePayment() - Web APIs
the paymentrequest method canmakepayment() determines whether or not the request is configured in a way that is compatible with at least one payment method supported by the user agent. you can call this before calling show() to provide a streamlined user experience when the user's browser can't handle any of the payment methods you accept. for instance, you might call canmakepayment() to determine if the browser will let the user pay using payment request api, and if it won't, you could fall back to another payment method, or offer a list of methods that aren't handled by payment request api (or even provide instructions for paying by mail or by phone). syntax paymentrequest.canmakepayment() .then( canpay => { ... }) .catch( error => { ... ...
...if the payment can't be processed, the promise receives a value of false. ...
...s that aren't handled by payment request api (or even provide instructions for paying by mail or by phone). syntax paymentrequest.canmakepayment() .then( canpay => { ... }) .catch( error => { ... }) canpay = await paymentrequest.canmakepayment(); returns a promise to a boolean that resolves to true if the user agent supports any of the payment methods supplied when instantiating the request using the paymentrequest constructor. if the payment can't be processed, the promise receives a value of false. note: if you call this too often, the browser may reject the returned promise with a domexception. parameters none examples in the following example, is excerpted from a demo that asynchronously builds a paymentrequest object for both apple pay and credit cards. it wraps the call...
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PaymentRequest.onshippingoptionchange - Web APIs
the onshippingoptionchange event of the paymentrequest interface is fired whenever the user changes a shipping option. syntax paymentrequest.addeventlistener('shippingoptionchange', shippingoptionchangeevent => { ... }); paymentrequest.onshippingoptionchange = function(shippingoptionchangeevent) { ... }; examples the shippingoptionchange event is triggered by a user-agent controlled interaction. if the option stored by the user agent changes at any time during a payment process, the event is triggered. to make sure an updated option is included when sending payment information to the server, you should add event listeners for a paymentrequest object after instantiation, but before the call to show(). ...
... event is triggered by a user-agent controlled interaction. if the option stored by the user agent changes at any time during a payment process, the event is triggered. to make sure an updated option is included when sending payment information to the server, you should add event listeners for a paymentrequest object after instantiation, but before the call to show(). // initialization of paymentrequest arguments are excerpted for clarity. ...
...teraction. if the option stored by the user agent changes at any time during a payment process, the event is triggered. to make sure an updated option is included when sending payment information to the server, you should add event listeners for a paymentrequest object after instantiation, but before the call to show(). // initialization of paymentrequest arguments are excerpted for clarity. ...
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Request.mode - Web APIs
the mode read-only property of the request interface contains the mode of the request (e.g., cors, no-cors, same-origin, or navigate.) this is used to determine if cross-origin requests lead to valid responses, and which properties of the response are readable. syntax var mymode = request.mode; value a requestmode value. the associated mode, available values of which are: same-origin — if a request is made to another origin with this mode set, the result is simply an error. you could use this to ensure that a request is always being made to your origin. no-cors — prevents the method from being anything other than head, get or post, and the headers from being anything other than simple headers. ...
...e values of which are: same-origin — if a request is made to another origin with this mode set, the result is simply an error. you could use this to ensure that a request is always being made to your origin. no-cors — prevents the method from being anything other than head, get or post, and the headers from being anything other than simple headers. if any serviceworkers intercept these requests, they may not add or override any headers except for those that are simple headers. in addition, javascript may not access any properties of the resulting response. this ensures that serviceworkers do not affect the semantics of the web and prevents security and privacy issues arising from leaking data across domains. ...
.... if any serviceworkers intercept these requests, they may not add or override any headers except for those that are simple headers. in addition, javascript may not access any properties of the resulting response. this ensures that serviceworkers do not affect the semantics of the web and prevents security and privacy issues arising from leaking data across domains. cors — allows cross-origin requests, for example to access various apis offered by 3rd party vendors. these are expected to adhere to the cors protocol. only a limited set of headers are exposed in the response, but the body is readable. navigate — a mode for supporting navigation. the navigate value is intended to be used only by html navigation. a navigate request is created only while navigating between documents. def...
...And 6 more matches

XDomainRequest - Web APIs
xdomainrequest is an implementation of http access control (cors) that worked in internet explorer 8 and 9. it was removed in internet explorer 10 in favor of using xmlhttprequest with proper cors; if you are targeting internet explorer 10 or later, or wish to support any other browser, you need to use standard http access control. this interface can send both get and post requests. syntax var xdr = new xdomainrequest(); returns a new xdomainrequest object, which can then be used to make and manage these requests. properties xdomainrequest.timeout gets or sets the amount of time until a request times out. xdomainrequest.responsetext gets the response body as a string. methods xdomainrequest.open() opens the request, specifing the method (get/post) and url. xdomainreq...
...equest(); returns a new xdomainrequest object, which can then be used to make and manage these requests. properties xdomainrequest.timeout gets or sets the amount of time until a request times out. xdomainrequest.responsetext gets the response body as a string. methods xdomainrequest.open() opens the request, specifing the method (get/post) and url. xdomainrequest.send() sends the request. post data is specified in this method. xdomainrequest.abort() aborts the request. event handlers xdomainrequest.onprogress a handler for when the request has made progress between the send method call and the onload event. xdomainrequest.ontimeout a handler for when the request times out. xdomainrequest.onerror a handler for when a request has errored. ...
...nd() sends the request. post data is specified in this method. xdomainrequest.abort() aborts the request. event handlers xdomainrequest.onprogress a handler for when the request has made progress between the send method call and the onload event. xdomainrequest.ontimeout a handler for when the request times out. xdomainrequest.onerror a handler for when a request has errored. xdomainrequest.onload a handler for when the full response has been received from the server. ...
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generateCRMFRequest() - Archive of obsolete content
mpatibility table at the bottom of this page to guide your decision. be aware that this feature may cease to work at any time. warning: the features mentioned in this article are deleted proprietary mozilla extensions, and are not supported in any other browser. they won't work in firefox 34 or later. use <keygen> or the future web crypto api instead. ...
...ty table at the bottom of this page to guide your decision. be aware that this feature may cease to work at any time. warning: the features mentioned in this article are deleted proprietary mozilla extensions, and are not supported in any other browser. they won't work in firefox 34 or later. use <keygen> or the future web crypto api instead. ...
...ratecrmfrequest("requesteddn", "regtoken", "authenticator", "escrowauthoritycert", "crmf generation done code", keysize1, "keyparams1", "keygenalg1", ..., keysizen, "keyparamsn", "keygenalgn"); this method will generate a sequence of crmf requests that has n requests. one request for each key pair that is generated. the first three parameters will be applied to every request. the "escrowauthoritycert" parameter will only be used for requests that pertain to a key that is being escrowed. after the "escrowauthoritycert" parameter, the method takes some javascript code that is invoked when the crmf request is ready. finally, there are 1 or m...
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PaymentRequest.abort() - Web APIs
the paymentrequest.abort() method of the paymentrequest interface causes the user agent to end the payment request and to remove any user interface that might be shown. syntax paymentrequest.abort(); returns void. parameters none examples the following example sets up a timeout to clear the payment request that might have been abandoned or neglected. ...
... the paymentrequest.abort() method of the paymentrequest interface causes the user agent to end the payment request and to remove any user interface that might be shown. syntax paymentrequest.abort(); returns void. parameters none examples the following example sets up a timeout to clear the payment request that might have been abandoned or neglected. ...
... the paymentrequest.abort() method of the paymentrequest interface causes the user agent to end the payment request and to remove any user interface that might be shown. syntax paymentrequest.abort(); returns void. parameters none examples the following example sets up a timeout to clear the payment request that might have been abandoned or neglected. ...
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Request.cache - Web APIs
the cache read-only property of the request interface contains the cache mode of the request. it controls how the request will interact with the browser's http cache. syntax var currentcachemode = request.cache; value a requestcache value. the available values are: default — the browser looks for a matching request in its http cache. if there is a match and it is fresh, it will be returned from the cache. if there is a match but it is stale, the browser will make a conditional request to the remote server. if the server indicates that the resource has not changed, it will be returned from the cache. otherwise the resource will be downloaded from the server and the cache will be updated. ...
... no-store — the browser fetches the resource from the remote server without first looking in the cache, and will not update the cache with the downloaded resource. ...
...loaded resource. no-store — the browser fetches the resource from the remote server without first looking in the cache, and will not update the cache with the downloaded resource. reload — the browser fetches the resource from the remote server without first looking in the cache, but then will update the cache with the downloaded resource. ...
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Request.context - Web APIs
the deprecated context read-only property of the request interface contains the context of the request (e.g., audio, image, iframe). this defines what sort of resource is being fetched. this has been replaced by the destination property. the context of a request is only relevant in the serviceworker api; a service worker can make decisions based on whether the url is for an image, or an embeddable object such as a <video>, iframe, etc. note: you can find a full list of the different available contexts including associated context frame types, csp directives, and platform feature examples in the fetch spec request context section. syntax var mycontext = request.context; value a requestcontext value. ...
...is for an image, or an embeddable object such as a <video>, iframe, etc. note: you can find a full list of the different available contexts including associated context frame types, csp directives, and platform feature examples in the fetch spec request context section. syntax var mycontext = request.context; value a requestcontext value. ...
...r an embeddable object such as a <video>, iframe, etc. note: you can find a full list of the different available contexts including associated context frame types, csp directives, and platform feature examples in the fetch spec request context section. syntax var mycontext = request.context; value a requestcontext value. ...
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Using XMLHttpRequest in IE6 - Web APIs
xmlhttprequest was first introduced by microsoft in internet explorer 5.0 as an activex control. however, in ie7 and other browsers xmlhttprequest is a native javascript object. ...
... xmlhttprequest was first introduced by microsoft in internet explorer 5.0 as an activex control. however, in ie7 and other browsers xmlhttprequest is a native javascript object. ...
... xmlhttprequest was first introduced by microsoft in internet explorer 5.0 as an activex control. however, in ie7 and other browsers xmlhttprequest is a native javascript object. ...
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XMLHttpRequest.responseType - Web APIs
when setting responsetype to a particular value, the author should make sure that the server is actually sending a response compatible with that format. if the server returns data that is not compatible with the responsetype that was set, the value of response will be null. ...
... when setting responsetype to a particular value, the author should make sure that the server is actually sending a response compatible with that format. if the server returns data that is not compatible with the responsetype that was set, the value of response will be null. ...
... when setting responsetype to a particular value, the author should make sure that the server is actually sending a response compatible with that format. if the server returns data that is not compatible with the responsetype that was set, the value of response will be null. ...
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NPN_RequestRead - Archive of obsolete content
returns if successful, the function returns nperr_no_error. ...
... returns if successful, the function returns nperr_no_error. ...
...t calls to npp_writeready() and npp_write(). syntax #include <npapi.h> nperror npn_requestread(npstream* stream, npbyterange* rangelist); parameters the function has the following parameters: stream stream of type np_seek from which to read bytes. rangelist range of bytes in the form of a linked list of npbyterange objects, each of which specifies a request for a range of bytes. returns if successful, the function returns nperr_no_error. if unsuccessful, the function returns an error code. for possible values, see error codes. description for a seekable stream, the browser sends data only in response to requests by the plug-in. the plug-in calls npn_requestread() to request data from a seekable stream. the plug-in can use this function to make ...
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JS_SuspendRequest
obsolete since jsapi 18this feature is obsolete. although it may still work in some browsers, its use is discouraged since it could be removed at any time. try to avoid using it. removed from spidermonkey at or prior to version 45. since then, a jsruntime is tied to the thread that created it; it may not be accessed by any other thread. ...
...use is discouraged since it could be removed at any time. try to avoid using it. removed from spidermonkey at or prior to version 45. since then, a jsruntime is tied to the thread that created it; it may not be accessed by any other thread. suspends the calling thread's current request, if any, to allow the thread to block or perform time-consuming calculations. syntax jsrefcount js_suspendrequest(jscontext *cx); void js_resumerequest(jscontext *cx, jsrefcount savedepth); name type description cx jscontext * the context whose current request is to be suspended or resumed. savedepth jsrefcount (only in js_resumerequest) the valued returned by the matching js_suspendrequest call. description in js_threadsafe builds, when a multi-threade...
... js_resumerequest(jscontext *cx, jsrefcount savedepth); name type description cx jscontext * the context whose current request is to be suspended or resumed. savedepth jsrefcount (only in js_resumerequest) the valued returned by the matching js_suspendrequest call. description in js_threadsafe builds, when a multi-threaded application is in a request but needs to block or perform lengthy computation that can race safely with the garbage collector, it should call js_suspendrequest before the time-consuming operation and js_resumerequest after. for more information about thread safety and requests, see js_threadsafe. js_suspendrequest suspends any currently active requests associated with the context cx. this allows the runtime to perform garb...
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Element.requestFullscreen() - Web APIs
it's not guaranteed that the element will be put into full screen mode. if permission to enter full screen mode is granted, the returned promise will resolve and the element will receive a fullscreenchange event to let it know that it's now in full screen mode. if permission is denied, the promise is rejected and the element receives a fullscreenerror event instead. if the element has been detached from the original document, then the document receives these events instead. earlier implementations of the fullscreen api would always send these events to the document rather than the element, and you may need to be able to handle that situation. ...
...e fullscreen api would always send these events to the document rather than the element, and you may need to be able to handle that situation. check browser compatibility in fullscreen for specifics on when each browser made this change. note: this method must be called while responding to a user interaction or a device orientation change; otherwise it will fail. syntax var promise = element.requestfullscreen(options); parameters options optional a fullscreenoptions object providing options that control the behavior of the transition to full-screen mode. currently, the only option is navigationui, which controls whether or not to show navigation ui while the element is in full-screen mode. the default value is "auto", which indicates that the browser should decide what to do. return...
...ently, the only option is navigationui, which controls whether or not to show navigation ui while the element is in full-screen mode. the default value is "auto", which indicates that the browser should decide what to do. return value a promise which is resolved with a value of undefined when the transition to full screen is complete. exceptions rather than throw a traditional exception, the requestfullscreen() procedure announces error conditions by rejecting the promise it has returned. the rejection handler receives one of the following exception values: typeerror the typeerror exception may be delivered in any of the following situations: the document containing the element isn't fully active; that is, it's not the current active document. the element is not contained by a docu...
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HTMLIFrameElement.allowPaymentRequest - Web APIs
living standard browser compatibility the compatibility table on this page is generated from structured data. ...
... living standard browser compatibility the compatibility table on this page is generated from structured data. ...
... living standard browser compatibility the compatibility table on this page is generated from structured data. ...
...And 4 more matches

IDBRequest: error event - Web APIs
the error handler is executed when an error caused a request to fail. ...
...rror caused a request to fail. ...
... cancelable no interface event event handler property onerror examples this example opens a database and tries to add a record, listening for the error event for the add() operation (this will occur if, for example, a record with the given tasktitle already exists): // open the database const dbopenrequest = window.indexeddb.open('todolist', 4); dbopenrequest.addeventlistener('upgradeneeded', event => { const db = event.target.result; db.onerror = () => { console.log('error creating database'); }; // create an objectstore for this database var objectstore = db.createobjectstore('todolist', { keypath: 'tasktitle' }); // define what data items the objectstore will contain objectstore.createindex('hours', 'hours', { unique: false });...
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IDBRequest.onerror - Web APIs
the onerror event handler of the idbrequest interface handles the error event, fired when a request returns an error. the event handler takes one parameter, an error event with type="error". note: this feature is available in web workers. syntax request.onerror = function(event) { ... }; example the following example requests a given record title, onsuccess gets the associated record from the idbobjectstore (made available as objectstoretitlerequest.result), updates one property of the record, and then puts the updated record back into the object store. also included at the bottom is an onerror function that reports what the error was if the request fails. for a full working example, see our to-do notifications app (view example live.) var title = "walk dog"; // open up a transaction a...
...t the bottom is an onerror function that reports what the error was if the request fails. ...
...at the error was if the request fails. ...
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IDBRequest.readyState - Web APIs
the readystate read-only property of the idbrequest interface returns the state of the request. every request starts in the pending state. the state changes to done when the request completes successfully or when an error occurs. note: this feature is available in web workers. syntax var currentreadystate = request.readystate; value the idbrequestreadystate of the request, which takes one of the following two values: value meaning pending the request is pending. done the request is done. ...
...mpletes successfully or when an error occurs. note: this feature is available in web workers. syntax var currentreadystate = request.readystate; value the idbrequestreadystate of the request, which takes one of the following two values: value meaning pending the request is pending. done the request is done. example the following example requests a given record title, onsuccess gets the associated record from the idbobjectstore (made available as objectstoretitlerequest.result), updates one property of the record, and then puts the updated record back into the object store in another request. the readystate of the 2nd request is logged to the developer console. for a full working example, see our to-do notifications app (view example liv...
...in another request. the readystate of the 2nd request is logged to the developer console. ...
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IDBRequest.source - Web APIs
the source read-only property of the idbrequest interface returns the source of the request, such as an index or an object store. if no source exists (such as when calling indexeddb.open), it returns null. note: this feature is available in web workers. syntax var idbindex = request.source; var idbcursor = request.source; var idbobjectstore = request.source; value an object representing the source of the request, such as an idbindex, idbobjectstore or idbcursor. ...
...dex or an object store. if no source exists (such as when calling indexeddb.open), it returns null. note: this feature is available in web workers. syntax var idbindex = request.source; var idbcursor = request.source; var idbobjectstore = request.source; value an object representing the source of the request, such as an idbindex, idbobjectstore or idbcursor. example the following example requests a given record title, onsuccess gets the associated record from the idbobjectstore (made available as objectstoretitlerequest.result), updates one property of the record, and then puts the updated record back into the object store in another request. the source of the 2nd request is logged to the developer console. for a full working example, see our to-do notifications app (view example live.) ...
...tore in another request. the source of the 2nd request is logged to the developer console. ...
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PaymentRequest.prototype.id - Web APIs
the id read-only attribute of the paymentrequest interface returns a unique identifier for a particular paymentrequest instance. when constructing an instance of the paymentrequest, you are able to supply an custom id via paymentdetailsinit dictionary's id member. if none is provided, the browser automatically sets the id value to a uuid. example this example shows how to give a paymentrequest instance a custom id. ...
...uest, you are able to supply an custom id via paymentdetailsinit dictionary's id member. if none is provided, the browser automatically sets the id value to a uuid. example this example shows how to give a paymentrequest instance a custom id. ...
... supply an custom id via paymentdetailsinit dictionary's id member. if none is provided, the browser automatically sets the id value to a uuid. example this example shows how to give a paymentrequest instance a custom id. const details = { id: "super-store-order-123-12312", total: { label: "total due", amount: { currency: "usd", value: "65.00" }, }, }; const request = new paymentrequest(methoddata, details); console.log(request.id); // super-store-order-123-12312 the id is then also available in the paymentresponse returned from the show() method, but under the requestid attribute. ...
...And 4 more matches

PaymentRequest: shippingoptionchange event - Web APIs
the code recalculates the total charge for the payment based on the selected shipping option. ...
...the code recalculates the total charge for the payment based on the selected shipping option. ...
...the code recalculates the total charge for the payment based on the selected shipping option. ...
...And 4 more matches

Window.requestAnimationFrame() - Web APIs
the window.requestanimationframe() method tells the browser that you wish to perform an animation and requests that the browser calls a specified function to update an animation before the next repaint. the method takes a callback as an argument to be invoked before the repaint. note: your callback routine must itself call requestanimationframe() if you want to animate another frame at the next repaint. you should call this method whenever you're ready to update your animation onscreen. this will request that your animation function be called before the browser performs the next repaint. the number of callbacks is usually 60 times per second, but will generally match the display refresh rate in most web browsers as per w3c recommendation. ...
...f you want to animate another frame at the next repaint. you should call this method whenever you're ready to update your animation onscreen. this will request that your animation function be called before the browser performs the next repaint. the number of callbacks is usually 60 times per second, but will generally match the display refresh rate in most web browsers as per w3c recommendation. requestanimationframe() calls are paused in most browsers when running in background tabs or hidden <iframe>s in order to improve performance and battery life. ...
...this timestamp is a decimal number, in milliseconds, but with a minimal precision of 1ms (1000 µs). ...
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XMLHttpRequest.responseXML - Web APIs
this property isn't available to workers. ...
... this property isn't available to workers. ...
... this property isn't available to workers. ...
...And 4 more matches

XMLHttpRequest.sendAsBinary() - Web APIs
you can create the binary string using the filereader method readasbinarystring(). the string is converted to binary for transfer by removing the high-order byte of each character. return value undefined. ...
...variant of the send() method that sends binary data. the send() method now supports binary data and should now be used instead. this method makes it possible to read and upload any type of file and to stringify the raw data. warning: this method is obsolete and should not be used. you should instead simply use the send() method, which now supports binary data in various forms. syntax xmlhttprequest.sendasbinary(binarystring); parameters binarystring a domstring which encodes the binary content to be sent. you can create the binary string using the filereader method readasbinarystring(). the string is converted to binary for transfer by removing the high-order byte of each character. return value undefined. polyfill since sendasbinary() is an experimental feature, here is a polyfi...
...ent. you can create the binary string using the filereader method readasbinarystring(). the string is converted to binary for transfer by removing the high-order byte of each character. return value undefined. polyfill since sendasbinary() is an experimental feature, here is a polyfill for browsers that don't support the sendasbinary() method but support typed arrays. ...
...And 4 more matches

JS_BeginRequest
indicates to the js engine that the calling thread is entering a region of code that may call into the jsapi but does not block. syntax void js_beginrequest(jscontext *cx); void js_endrequest(jscontext *cx); name type description cx jscontext * the context in which the calling thread intends to call jsapi functions. description when your multithreaded application wants to use a jscontext, it must use js_beginrequest and js_endrequest to bracket maximal non-blocking hunks of native code that call the jsapi. this "request model" is necessary to interlock with the global garbage collector. in a js_threadsafe build, many jsapi functions must only be called from within a request. in this reference, the cx parameter of such functions is documented wit...
...jscontext, it must use js_beginrequest and js_endrequest to bracket maximal non-blocking hunks of native code that call the jsapi. this "request model" is necessary to interlock with the global garbage collector. in a js_threadsafe build, many jsapi functions must only be called from within a request. in this reference, the cx parameter of such functions is documented with the phrase “requires request”, like this: name type description cx jscontext * the context to use. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. in a debug build, this is enforced with assertions. requests constrain garbage collection. ...
... parameter of such functions is documented with the phrase “requires request”, like this: name type description cx jscontext * the context to use. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. in a debug build, this is enforced with assertions. requests constrain garbage collection. if any thread is in a requests, garbage collection can happen only when that thread calls into the jsapi. if one thread needs garbage collection, it blocks until each other thread makes a jsapi call. it is therefore imperative that native code executing within an active request on cx not block, or simply take too long, outside the jsapi. any blocking native call, or lengthy computation that can race safely with the garbage co...
...And 3 more matches

IDBCursor.request - Web APIs
the request read-only property of the idbcursor interface returns the idbrequest used to obtain the cursor. note: this feature is available in web workers. syntax var request = cursor.request; value an idbrequest object instance. examples when you open a cursor, the request property is then available on that cursor object, to tell you what request object the cursor originated from. ...
...uest; value an idbrequest object instance. examples when you open a cursor, the request property is then available on that cursor object, to tell you what request object the cursor originated from. ...
...ance. examples when you open a cursor, the request property is then available on that cursor object, to tell you what request object the cursor originated from. ...
...And 3 more matches

IDBOpenDBRequest.onblocked - Web APIs
the onblocked event handler of the idbopendbrequest interface is the event handler for the blocked event. this event is triggered when the upgradeneeded should be triggered because of a version change but the database is still in use (that is, not closed) somewhere, even after the versionchange event was sent. note: this feature is available in web workers. syntax idbopendbrequest.onblocked = function(event) { ... ...
...handler for the blocked event. this event is triggered when the upgradeneeded should be triggered because of a version change but the database is still in use (that is, not closed) somewhere, even after the versionchange event was sent. note: this feature is available in web workers. syntax idbopendbrequest.onblocked = function(event) { ... }; example var db; // let us open our database var request = indexeddb.open("todolist", 4); // these two event handlers act on the database being opened // successfully, or not request.onerror = function(event) { note.innerhtml += '<li>error loading database.</li>'; }; request.onsuccess = function(event) { note.innerhtml += '<li>database initialised.</li>'; // store the result of opening the database in the db variable. // this is used a lot b...
....open("todolist", 4); // these two event handlers act on the database being opened // successfully, or not request.onerror = function(event) { note.innerhtml += '<li>error loading database.</li>'; }; request.onsuccess = function(event) { note.innerhtml += '<li>database initialised.</li>'; // store the result of opening the database in the db variable. // this is used a lot below db = request.result; // run the displaydata() function to populate the task list with // all the to-do list data already in the idb displaydata(); }; // this event handles the event whereby a new version of the // database needs to be created. either one has not been created // before, or a new version number has been submitted via the // window.indexeddb.open line above //it is only implemented in re...
...And 3 more matches

IDBOpenDBRequest.onupgradeneeded - Web APIs
the onupgradeneeded property of the idbopendbrequest interface is the event handler for the upgradeneeded event, triggered when a database of a bigger version number than the existing stored database is loaded. the event passed to the listener is an idbversionchangeevent. inside the event handler function you can include code to upgrade the database structure, as shown in the example below. note: this feature is available in web workers. syntax idbopendbrequest.onupgradeneeded = function(event) { ... }; example in the following example you can see the onupgradeneeded handler being used to update the database structure if a database with a higher version number is loaded. ...
...xample below. note: this feature is available in web workers. syntax idbopendbrequest.onupgradeneeded = function(event) { ... }; example in the following example you can see the onupgradeneeded handler being used to update the database structure if a database with a higher version number is loaded. for a full working example, see our to-do notifications app (view example live.) var db; // request version 3 of the database. var request = window.indexeddb.open("library", 3); // this event handles the event whereby a new version of the // database needs to be created. either one has not been created // before, or a new version number has been submitted via the // window.indexeddb.open line above. ...
...full working example, see our to-do notifications app (view example live.) var db; // request version 3 of the database. var request = window.indexeddb.open("library", 3); // this event handles the event whereby a new version of the // database needs to be created. either one has not been created // before, or a new version number has been submitted via the // window.indexeddb.open line above. request.onupgradeneeded = function(event) { db = request.result; db.onerror = function(errorevent) { note.innerhtml += '<li>error loading database.</li>'; }; if (event.oldversion < 1) { // version 1 is the first version of the database. var store = db.createobjectstore("books", {keypath: "isbn"}); var titleindex = store.createindex("by_title", "title", {unique: true}); var a...
...And 3 more matches

PaymentRequest.onshippingaddresschange - Web APIs
the onshippingaddresschange event of the paymentrequest interface is fired whenever the user changes their shipping address, including when an address is added by the user for the first time. syntax paymentrequest.addeventlistener('shippingaddresschange', shippingaddresschangeevent => { ... }); paymentrequest.onshippingaddresschange = function(shippingaddresschangeevent) { ... }; examples the shippingaddresschange event is triggered by a user-agent controlled interaction. if the address stored by the user agent changes at any time during a payment process, the event is triggered. to make sure an updated address is included when sending payment information to the server, you should add event listeners for a paymentrequest object after instantiation, but before the call to show(). // initi...
...vent is triggered by a user-agent controlled interaction. if the address stored by the user agent changes at any time during a payment process, the event is triggered. to make sure an updated address is included when sending payment information to the server, you should add event listeners for a paymentrequest object after instantiation, but before the call to show(). // initialization of paymentrequest arguments are excerpted for clarity. ...
...ss stored by the user agent changes at any time during a payment process, the event is triggered. to make sure an updated address is included when sending payment information to the server, you should add event listeners for a paymentrequest object after instantiation, but before the call to show(). // initialization of paymentrequest arguments are excerpted for clarity. var payment = new paymentrequest(supportedinstruments, details, options); request.addeventlistener('shippingaddresschange', function(evt) { evt.updatewith(new promise(function(resolve) { updatedetails(details, request.shippingaddress, resolve); })); }); payment.show().then(function(paymentresponse) { // processing of paymentresponse exerpted for the same of clarity. }).catch(function(err) { console.error("uh oh, so...
...And 3 more matches

Request.destination - Web APIs
these destinations vary substantially in how they operate. some are simply data receptacles, where the received data is stored for processing later. others are script-based, in which case the received data is delivered to a script by calling it and passing the data along. ...
... these destinations vary substantially in how they operate. some are simply data receptacles, where the received data is stored for processing later. others are script-based, in which case the received data is delivered to a script by calling it and passing the data along. ...
...ored for processing later. others are script-based, in which case the received data is delivered to a script by calling it and passing the data along. script-based destinations include <script> elements, as well as any of the worklet-based destinations (including audioworklet and paintworklet), and the worker-based destinations, including serviceworker and sharedworker. ...
...And 3 more matches

StorageQuota.requestPersistentQuota - Web APIs
obsolete initial definition. ...
... obsolete initial definition. ...
... obsolete initial definition. ...
...And 3 more matches

WakeLock.request() - Web APIs
the request() method of the wakelock interface returns a promise that resolves with a wakelocksentinel object, which allows control over screen dimming and locking. syntax var wakelock = navigator.wakelock.request(type); parameters type options are as follows: 'screen': requests a screen wake lock. prevents devices from dimming or locking the screen. return value a promise that resolves with a wakelocksentinel object. exceptions notallowederror thrown when wake lock is not available, which can happen because: document is not allowed to use screen wake lock due to screen-wake-lock policy. document is not fully active. document is hidden. user agent could not acquire platform's wake lock. ...
...e a promise that resolves with a wakelocksentinel object. exceptions notallowederror thrown when wake lock is not available, which can happen because: document is not allowed to use screen wake lock due to screen-wake-lock policy. document is not fully active. document is hidden. user agent could not acquire platform's wake lock. ...
...cksentinel object. exceptions notallowederror thrown when wake lock is not available, which can happen because: document is not allowed to use screen wake lock due to screen-wake-lock policy. document is not fully active. document is hidden. user agent could not acquire platform's wake lock. examples the following asynchronous function requests a wakelocksentinel object. ...
...And 3 more matches

XMLHttpRequest.onreadystatechange - Web APIs
an eventhandler that is called whenever the readystate attribute changes. the callback is called from the user interface thread. the xmlhttprequest.onreadystatechange property contains the event handler to be called when the readystatechange event is fired, that is every time the readystate property of the xmlhttprequest changes. warning: this should not be used with synchronous requests and must not be used from native code. syntax xmlhttprequest.onreadystatechange = callback; values callback is the function to be executed when the readystate changes. ...
...to be called when the readystatechange event is fired, that is every time the readystate property of the xmlhttprequest changes. warning: this should not be used with synchronous requests and must not be used from native code. syntax xmlhttprequest.onreadystatechange = callback; values callback is the function to be executed when the readystate changes. ...
...mlhttprequest.onreadystatechange = callback; values callback is the function to be executed when the readystate changes. ...
...And 3 more matches

XMLHttpRequest.open() - Web APIs
async optional an optional boolean parameter, defaulting to true, indicating whether or not to perform the operation asynchronously. if this value is false, the send() method does not return until the response is received. ...
... async optional an optional boolean parameter, defaulting to true, indicating whether or not to perform the operation asynchronously. if this value is false, the send() method does not return until the response is received. ...
... async optional an optional boolean parameter, defaulting to true, indicating whether or not to perform the operation asynchronously. if this value is false, the send() method does not return until the response is received. ...
...And 3 more matches

XMLHttpRequest.response - Web APIs
the xmlhttprequest response property returns the response's body content as an arraybuffer, blob, document, javascript object, or domstring, depending on the value of the request's responsetype property. syntax var body = xmlhttprequest.response; value an appropriate object based on the value of responsetype. you may attempt to request the data be provided in a specific format by setting the value of responsetype after calling open() to initialize the request but before calling send() to send the request to the server. ...
... the response types are described below. "" an empty responsetype string is treated the same as "text", the default type. ...
... the response types are described below. "" an empty responsetype string is treated the same as "text", the default type. arraybuffer the response is a javascript arraybuffer containing binary data. ...
...And 3 more matches

XMLHttpRequestResponseType - Web APIs
json the response is a javascript object created by parsing the contents of received data as json. ...
... json the response is a javascript object created by parsing the contents of received data as json. ...
... json the response is a javascript object created by parsing the contents of received data as json. ...
...And 3 more matches

CSP: upgrade-insecure-requests - HTTP
the http content-security-policy (csp) upgrade-insecure-requests directive instructs user agents to treat all of a site's insecure urls (those served over http) as though they have been replaced with secure urls (those served over https). this directive is intended for web sites with large numbers of insecure legacy urls that need to be rewritten. the upgrade-insecure-requests directive is evaluated before block-all-mixed-content and if it is set, the latter is effectively a no-op. it is recommended to set either directive, but not both, unless you want to force https on older browsers that do not force it after a redirect to http. ...
...ed for web sites with large numbers of insecure legacy urls that need to be rewritten. the upgrade-insecure-requests directive is evaluated before block-all-mixed-content and if it is set, the latter is effectively a no-op. it is recommended to set either directive, but not both, unless you want to force https on older browsers that do not force it after a redirect to http. ...
...-insecure-requests directive will not ensure that users visiting your site via links on third-party sites will be upgraded to https for the top-level navigation and thus does not replace the strict-transport-security (hsts) header, which should still be set with an appropriate max-age to ensure that users are not subject to ssl stripping attacks. syntax content-security-policy: upgrade-insecure-requests; examples // header content-security-policy: upgrade-insecure-requests; // meta tag <meta http-equiv="content-security-policy" content="upgrade-insecure-requests"> with the above header set on a domain example.com that wants to migrate from http to https, non-navigational insecure resource requests are automatically upgraded (first-party as well as third-party requests). <img src="http://e...
...And 3 more matches

HTTP request methods - HTTP
post the post method is used to submit an entity to the specified resource, often causing a change in state or side effects on the server. ...
... post the post method is used to submit an entity to the specified resource, often causing a change in state or side effects on the server. ...
... post the post method is used to submit an entity to the specified resource, often causing a change in state or side effects on the server. ...
...And 3 more matches

Requests For Enhancement - Archive of obsolete content
then you can give a vote by clicking on the 'vote' link on the bug page. ...
...then you can give a vote by clicking on the 'vote' link on the bug page. ...
...then you can give a vote by clicking on the 'vote' link on the bug page. ...
...And 2 more matches

Request header - MDN Web Docs Glossary: Definitions of Web-related terms
a request header is an http header that can be used in an http request, and that doesn't relate to the content of the message. request headers, like accept, accept-*, or if-* allow to perform conditional requests; others like cookie, user-agent, or referer precise the context so that the server can tailor the answer. not all headers appearing in a request are request headers. for example, the content-length appearing in a post request is actually an entity header referring to the size of the body of the request message. however, these entity headers are often called request headers in such a context. ...
... referer precise the context so that the server can tailor the answer. not all headers appearing in a request are request headers. for example, the content-length appearing in a post request is actually an entity header referring to the size of the body of the request message. however, these entity headers are often called request headers in such a context. in addition, cors defines a subset of request headers as simple headers, request headers that are always considered authorized and are not explicitly listed in responses to preflight requests. ...
...h appearing in a post request is actually an entity header referring to the size of the body of the request message. however, these entity headers are often called request headers in such a context. in addition, cors defines a subset of request headers as simple headers, request headers that are always considered authorized and are not explicitly listed in responses to preflight requests. ...
...And 2 more matches

BasicCardRequest.supportedNetworks - Web APIs
the supportednetworks property of the basiccardrequest dictionary contains an array of domstrings representing the card networks that the retailer supports (e.g. amex, mastercard). syntax supportednetworks : [value [, ... value]] value an array containing one or more domstrings, which describe the card networks the retailer supports. legal values are defined in the w3c's document card network identifiers approved for use with payment request api, and are currently: amex cartebancaire diners discover jcb mastercard mir unionpay visa example the following example shows a sample definition of the first parameter of the paymentrequest() constructor, the data property of which contains supportednetworks and supportedtypes properties. var supportedinstruments = [{ supportedmeth...
...onstructor, the data property of which contains supportednetworks and supportedtypes properties. var supportedinstruments = [{ supportedmethods: 'basic-card', data: { supportednetworks: ['visa', 'mastercard', 'amex', 'jcb', 'diners', 'discover', 'mir', 'unionpay'], supportedtypes: ['credit', 'debit'] } }]; var details = { ... }; var options = { ... }; var request = new paymentrequest(supportedinstruments, details, options); specifications specification status comment basic card paymentthe definition of 'supportednetworks' in that specification. working draft initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, ple...
...ons specification status comment basic card paymentthe definition of 'supportednetworks' in that specification. working draft initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetsupportednetworkschrome no support noedge no support ≤18 — 79firefox full support 56notes disabled full ...
...And 2 more matches

IDBOpenDBRequest: blocked event - Web APIs
the blocked handler is executed when an open connection to a database is blocking a versionchange transaction on the same database. ...
... blocked handler is executed when an open connection to a database is blocking a versionchange transaction on the same database. ...
...asktitle' }); // define what data items the objectstore will contain objectstore.createindex('hours', 'hours', { unique: false }); objectstore.createindex('minutes', 'minutes', { unique: false }); objectstore.createindex('day', 'day', { unique: false }); objectstore.createindex('month', 'month', { unique: false }); objectstore.createindex('year', 'year', { unique: false }); }; dbopenrequest.onsuccess = (event) => { // let's try to open the same database with a higher revision version const req2 = indexeddb.open('todolist', 5); // in this case the onblocked handler will be executed req2.addeventlistener('blocked', () => { console.log('request was blocked'); }); }; using the onblocked property: // open the database const dbopenrequest = window.indexeddb.open('todolis...
...And 2 more matches

IDBRequest.onsuccess - Web APIs
the onsuccess event handler of the idbrequest interface handles the success event, fired when the result of a request is successfully returned. the event handler takes one parameter, a success event with type="success". note: this feature is available in web workers. syntax request.onsuccess = function(event) { ... }; example the following example requests a given record title, onsuccess gets the associated record from the idbobjectstore (made available as objectstoretitlerequest.result), updates one property of the record, and then puts the updated record back into the object store. for a full working example, see our to-do notifications app (view example live.) var title = "walk dog"; // open up a transaction as usual var objectstore = db.transaction(['todolist'], "readwrite").object...
... one property of the record, and then puts the updated record back into the object store. ...
...ted record back into the object store. ...
...And 2 more matches

IDBRequest.result - Web APIs
the result read-only property of the idbrequest interface returns the result of the request. if the request failed and the result is not available, an invalidstateerror exception is thrown. note: this feature is available in web workers. syntax var myresult = request.result; value any example the following example requests a given record title, onsuccess gets the associated record from the idbobjectstore (made available as objectstoretitlerequest.result), updates one property of the record, and then puts the updated record back into the object store. for a full working example, see our to-do notifications app (view example live.) var title = "walk dog"; // open up a transaction as usual var objectstore = db.transaction(['todolist'], "readwrite").objectstore('todolist'); // get the to...
... one property of the record, and then puts the updated record back into the object store. ...
...ted record back into the object store. ...
...And 2 more matches

IDBRequest: success event - Web APIs
the success event is fired when an idbrequest succeeds. ...
... the success event is fired when an idbrequest succeeds. ...
... the success event is fired when an idbrequest succeeds. ...
...And 2 more matches

Notification.requestPermission() - Web APIs
note: this feature is available in web workers. note: this feature is not available in sharedworker note: safari still uses the callback syntax to get the permission. read using the notifications api for a good example of how to feature detect this and run code as appropriate. the requestpermission() method of the notification interface requests permission from the user for the current origin to display notifications. ...
...k syntax to get the permission. read using the notifications api for a good example of how to feature detect this and run code as appropriate. the requestpermission() method of the notification interface requests permission from the user for the current origin to display notifications. syntax the latest spec has updated this method to a promise-based syntax that works like this: notification.requestpermission().then(function(permission) { ... }); previously, the syntax was based on a simple callback; this version is now deprecated: notification.requestpermission(callback); parameters callback optional deprecated since gecko 46 an optional callback function that is called with the permission value. deprecated in favor of the promise return value. returns a promise that resolves to a...
... function notifyme() { // let's check if the browser supports notifications if (!("notification" in window)) { alert("this browser does not support desktop notification"); } // let's check whether notification permissions have already been granted else if (notification.permission === "granted") { // if it's okay let's ...
...And 2 more matches

PaymentRequest: merchantvalidation event - Web APIs
merchantvalidation events are delivered by the payment request api to a paymentrequest object when a payment handler requires that the merchant requesting the purchase validate itself as permitted to use the payment handler. see merchant validation in payment processing concepts for details on how the merchant validation process works. bubbles no cancelable no interface merchantvalidationevent event handler property onmerchantvalidation examples in this example, an event handler is established for the merchantvalidation event. it uses the fetch() to send a request to its own server with an argument of the payment method's validation url, obtained from the event's validationurl property. the merchant server should access the validation url...
...xample, an event handler is established for the merchantvalidation event. it uses the fetch() to send a request to its own server with an argument of the payment method's validation url, obtained from the event's validationurl property. the merchant server should access the validation url in accordance with the payment method documention. typically, a client should not access the validation url. ...
...the content delivered by the validation server is forwarded to the merchant server and is then returned from the fetch() call's fulfillment handler to the complete() method on the event. ...
...And 2 more matches

PaymentRequest.onmerchantvalidation - Web APIs
the paymentrequest event handler onmerchantvalidation is invoked when the merchantvalidation is fired, indicating that the payment handler (e.g., apple pay) requires the merchant to validate themselves. this is usually the first event to be fired, and the user won't be able to proceed with a payment until the merchant validate themselves. this event is not be fired by all payment handlers. in particular, it's used by apple pay. syntax paymentrequest.onmerchantvalidation = eventhandlerfunction; value an event handler function which is to be called whenever the merchantvalidation event is fired at the paymentrequest, indicating that the payment handler requires the merchant to validate themselves as allowed to use this payment handler. examples an example merchant validation handler for t...
...used by apple pay. syntax paymentrequest.onmerchantvalidation = eventhandlerfunction; value an event handler function which is to be called whenever the merchantvalidation event is fired at the paymentrequest, indicating that the payment handler requires the merchant to validate themselves as allowed to use this payment handler. ...
...ay. syntax paymentrequest.onmerchantvalidation = eventhandlerfunction; value an event handler function which is to be called whenever the merchantvalidation event is fired at the paymentrequest, indicating that the payment handler requires the merchant to validate themselves as allowed to use this payment handler. ...
...And 2 more matches

PaymentRequest - Web APIs
the payment request api's paymentrequest interface the primary access point into the api, and lets web content and apps accept payments from the end user on behalf of the operator of the site or the publisher of the app. constructor paymentrequest() secure context creates a new paymentrequest object. properties paymentrequest.id read only secure context an unique identifier for a particular paymentrequest, which can be set via details.id. when none is set, it defaults to a uuid. paymentrequest.shippingaddress read only secure context if requested via payment options, returns the shipping address chosen by the user for the purposes of calculating shipping. this property is only populated if the constructor is called with the requestshipping flag set to true. additionally, ...
...ia payment options, returns the shipping address chosen by the user for the purposes of calculating shipping. this property is only populated if the constructor is called with the requestshipping flag set to true. additionally, in some browsers, the parts of the address will be redacted for privacy until the user indicates they are ready to complete the transaction (i.e., they hit "pay"). paymentrequest.shippingoption read only secure context returns the identifier of the selected shipping option. this property is only populated if the constructor is called with the requestshipping flag set to true. paymentrequest.shippingtype read only secure context returns the type of shipping used to fulfill the transaction. this will be one of shipping, delivery, pickup, or null if a value was not prov...
...ns the identifier of the selected shipping option. this property is only populated if the constructor is called with the requestshipping flag set to true. paymentrequest.shippingtype read only secure context returns the type of shipping used to fulfill the transaction. this will be one of shipping, delivery, pickup, or null if a value was not provided in the constructor. methods paymentrequest.canmakepayment() secure context indicates whether the paymentrequest object can make a payment before calling show(). paymentrequest.show() secure context causes the user agent to begin the user interaction for the payment request. paymentrequest.abort() secure context causes the user agent to end the payment request and to remove any user interface that might be shown. events mercha...
...And 2 more matches

PaymentRequestUpdateEvent - Web APIs
properties provides only the properties inherited from its parent interface, event. ...
... properties provides only the properties inherited from its parent interface, event. ...
...aymentrequest. those events are: shippingaddresschange secure context dispatched whenever the user changes their shipping address. also available using the onshippingaddresschange event handler property. shippingoptionchange secure context dispatched whenever the user changes a shipping option. also available using the onshippingoptionchange event handler property. constructor paymentrequestupdateevent() secure context creates a new paymentrequestupdateevent object. properties provides only the properties inherited from its parent interface, event. ...
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PublicKeyCredentialRequestOptions - Web APIs
the publickeycredentialrequestoptions dictionary of the web authentication api holds the options passed to navigator.credentials.get() in order to fetch a given publickeycredential. properties publickeycredentialrequestoptions.challenge a buffersource, emitted by the relying party's server and used as a cryptographic challenge. this value will be signed by the authenticator and the signature will be sent back as part of authenticatorassertionresponse.signature. publickeycredentialrequestoptions.timeout optional a numerical hint, in milliseconds, which indicates the time the caller is willing to wait for the retrieval operation to complete. this hint may be overridden by the browser. ...
...phic challenge. this value will be signed by the authenticator and the signature will be sent back as part of authenticatorassertionresponse.signature. publickeycredentialrequestoptions.timeout optional a numerical hint, in milliseconds, which indicates the time the caller is willing to wait for the retrieval operation to complete. this hint may be overridden by the browser. publickeycredentialrequestoptions.rpid optional a usvstring which indicates the relying party's identifier (ex. "login.example.org"). if this option is not provided, the client will use the current origin's domain. ...
...hint, in milliseconds, which indicates the time the caller is willing to wait for the retrieval operation to complete. this hint may be overridden by the browser. publickeycredentialrequestoptions.rpid optional a usvstring which indicates the relying party's identifier (ex. "login.example.org"). if this option is not provided, the client will use the current origin's domain. publickeycredentialrequestoptions.allowcredentials optional an array of credentials descriptor which restricts the acceptable existing credentials for retrieval. publickeycredentialrequestoptions.userverification optional a string qualifying how the user verification should be part of the authentication process. publickeycredentialrequestoptions.extensions optional an object with several client extensions' inputs. tho...
...And 2 more matches

RTCIceCandidatePairStats.lastRequestTimestamp - Web APIs
the rtcicecandidatepairstats property lastrequesttimestamp indicates the time at which the most recent stun request was sent on the described candidate pair. syntax lastrequesttimestamp = rtcicecandidatepairstats.lastrequesttimestamp; value a domhighrestimestamp object indicating the timestamp at which the last (most recent) stun request was sent on the connection indicated by the described pair of candidates. ...
...s the time at which the most recent stun request was sent on the described candidate pair. syntax lastrequesttimestamp = rtcicecandidatepairstats.lastrequesttimestamp; value a domhighrestimestamp object indicating the timestamp at which the last (most recent) stun request was sent on the connection indicated by the described pair of candidates. ...
...he most recent stun request was sent on the described candidate pair. syntax lastrequesttimestamp = rtcicecandidatepairstats.lastrequesttimestamp; value a domhighrestimestamp object indicating the timestamp at which the last (most recent) stun request was sent on the connection indicated by the described pair of candidates. ...
...And 2 more matches

How to check the security state of an XMLHTTPRequest over SSL - Web APIs
here is a an example javascript function that prints the security details of an xmlhttprequest sent over ssl. the function is passed the channel property of an xmlhttprequest to extract the following information: was the connection secure? was the used ssl certificate valid and what are its details (owner, expiration, certificate authority, etc.)? ...
... property of an xmlhttprequest to extract the following information: was the connection secure? was the used ssl certificate valid and what are its details (owner, expiration, certificate authority, etc.)? notes: this code requires elevated privileges to run; you can only call it from a browser extension or from a xulrunner application. the channel property becomes available only after the request is sent and the connection was established, that is, on readystate loaded, interactive or completed. by setting the mozbackgroundrequest property of the request object and modifying the example appropriately, you can create your own alert dialog to handle ssl exceptions in your firefox extension or xulrunner application. // adapted from the patch for moztcpsocket error reporting (bug 861196). ...
...undrequest property of the request object and modifying the example appropriately, you can create your own alert dialog to handle ssl exceptions in your firefox extension or xulrunner application. // adapted from the patch for moztcpsocket error reporting (bug 861196). const {cc,ci} = require("chrome"); function createtcperrorfromfailedxhr(xhr) { let status = xhr.channel.queryinterface(ci.nsirequest).status; let errtype; if ((status & 0xff0000) === 0x5a0000) { // security module const nsinsserrorsservice = ci.nsinsserrorsservice; let nsserrorsservice = cc['@mozilla.org/nss_errors_service;1'].getservice(nsinsserrorsservice); let errorclass; // geterrorclass will throw a generic ns_error_failure if the error code is // somehow not in the set of covered errors. try...
...And 2 more matches

XMLHttpRequest.overrideMimeType() - Web APIs
return value undefined. example this example specifies a mime type of "text/plain", overriding the server's stated type for the data being received. ...
... return value undefined. example this example specifies a mime type of "text/plain", overriding the server's stated type for the data being received. ...
... return value undefined. example this example specifies a mime type of "text/plain", overriding the server's stated type for the data being received. ...
...And 2 more matches

XMLHttpRequest.send() - Web APIs
the xmlhttprequest method send() sends the request to the server. if the request is asynchronous (which is the default), this method returns as soon as the request is sent and the result is delivered using events. if the request is synchronous, this method doesn't return until the response has arrived. send() accepts an optional parameter which lets you specify the request's body; this is primarily used for requests such as put. if the request method is get or head, the body parameter is ignored and the request body is set to null. if no accept header has been set using the setrequestheader(), an accept header with the type "*/*" (any type) is sent. syntax xmlhttprequest.send(body) parameters body optional a body of data to be sent in the xhr request. this can be: a document, in wh...
... null if no value is specified for the body, a default value of null is used. the best way to send binary content (e.g. in file uploads) is by using an arraybufferview or blob in conjunction with the send() method. ...
...rchparams, or usvstring object. null if no value is specified for the body, a default value of null is used. the best way to send binary content (e.g. in file uploads) is by using an arraybufferview or blob in conjunction with the send() method. return value undefined. exceptions exception description invalidstateerror send() has already been invoked for the request, and/or the request is complete. networkerror the resource type to be fetched is a blob, and the method is not get. example: get var xhr = new xmlhttprequest(); xhr.open('get', '/server', true); xhr.onload = function () { // request finished. do processing here. }; xhr.send(null); // xhr.send('string'); // xhr.send(new blob()); // xhr.send(new int8array()); // xhr.send(doc...
...And 2 more matches

XRSession.requestReferenceSpace() - Web APIs
the "interface" column in the table below indicates which of the two types is returned for each reference space type constant.. ...
...the "interface" column in the table below indicates which of the two types is returned for each reference space type constant.. ...
...the "interface" column in the table below indicates which of the two types is returned for each reference space type constant.. ...
...And 2 more matches

PRMcastRequest
ifaddr local ip address of interface. ...
... ifaddr local ip address of interface. ...
... ifaddr local ip address of interface. ...
... ifaddr local ip address of interface. ...

JS_YieldRequest
obsolete since jsapi 18this feature is obsolete. although it may still work in some browsers, its use is discouraged since it could be removed at any time. try to avoid using it. momentarily suspend the current jsapi request, allowing garbage collection to run if another thread has requested it. syntax void js_yieldrequest(jscontext *cx); name type description cx jscontext * the jscontext that is currently in a request on the calling thread. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. description for more information about thread safety and requests, see js_threadsafe. js_yieldrequest momentarily suspends the current request. a program can call this function periodically to ensure that a long...
...* the jscontext that is currently in a request on the calling thread. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. description for more information about thread safety and requests, see js_threadsafe. js_yieldrequest momentarily suspends the current request. a program can call this function periodically to ensure that a long-running request does not block garbage collection indefinitely. the effect is the same as a call to js_suspendrequest immediately followed by a call to js_resumerequest. jsapi 1.7 and earlier js_yieldrequest did not cause cx to relinquish objects it created to other threads that are blocked waiting for them. this bug (bug 402898) will be fixed in spidermonkey 1.8. ...
...-running request does not block garbage collection indefinitely. the effect is the same as a call to js_suspendrequest immediately followed by a call to js_resumerequest. jsapi 1.7 and earlier js_yieldrequest did not cause cx to relinquish objects it created to other threads that are blocked waiting for them. this bug (bug 402898) will be fixed in spidermonkey 1.8. jsapi 1.7 and earlier js_yieldrequest is available only in js_threadsafe builds. in spidermonkey 1.8 and later, this function will be present, but will do nothing, in non-js_threadsafe builds. ...
...ier js_yieldrequest did not cause cx to relinquish objects it created to other threads that are blocked waiting for them. this bug (bug 402898) will be fixed in spidermonkey 1.8. jsapi 1.7 and earlier js_yieldrequest is available only in js_threadsafe builds. in spidermonkey 1.8 and later, this function will be present, but will do nothing, in non-js_threadsafe builds. ...

nsIXMLHttpRequestEventTarget
1.0 66 introduced gecko 1.9.1 inherits from: nsidomeventtarget last changed in gecko 5.0 (firefox 5.0 / thunderbird 5.0 / seamonkey 2.2) attributes attribute type description onabort nsidomeventlistener a javascript function object that gets invoked if the operation is canceled by the user. onerror nsidomeventlistener a javascript function object that gets invoked if the operation fails to complete due to an error. onload nsidomeventlistener a javascript function object that gets invoked when the operation is successfully completed. ...
... the operation begins. ...
...begins. ...
...ss nsidomeventlistener a javascript function object that gets invoked zero or more times, after the loadstart event, but before any abort, error, or load events occur. handling the events when the handler functions for these events are called, they receive as a parameter a progressevent, which implements the nsidomprogressevent interface. see also using xmlhttprequest xmlhttprequest nsixmlhttprequest nsidomprogressevent ...

FetchEvent.request - Web APIs
the request read-only property of the fetchevent interface returns the request that triggered the event handler. this property is non-nullable (since version 46, in the case of firefox.) if a request is not provided by some other means, the constructor init object must contain a request (see fetchevent.fetchevent().) syntax var recentrequest = fetchevent.request; value a request object. example this code snippet is from the service worker fetch sample (run the fetch sample live). the serviceworkerglobalscope.onfetch event handler listens for the fetch event. when fired, pass a promise that back to the controlled page to fetchevent.respondwith(). this promise resolves to the first matching url request in the cache object. if no match is found, the code fetches a response from the network. ...
...found, the code fetches a response from the network. the code also handles exceptions thrown from the serviceworkerglobalscope.fetch operation. note that an http error response (e.g., 404) will not trigger an exception. it will return a normal response object that has the appropriate error code set. ...
...ode also handles exceptions thrown from the serviceworkerglobalscope.fetch operation. note that an http error response (e.g., 404) will not trigger an exception. it will return a normal response object that has the appropriate error code set. ...
...listener('fetch', function(event) { console.log('handling fetch event for', event.request.url); event.respondwith( caches.match(event.request).then(function(response) { if (response) { console.log('found response in cache:', response); return response; } console.log('no response found in cache. about to fetch from network...'); return fetch(event.request).then(function(response) { console.log('response from network is:', response); return response; }).catch(function(error) { console.error('fetching failed:', error); throw error; }); }) ); }); specifications specification status comment service workersthe definition of 'request' in that specification. working draft ...

HTMLFormElement.requestSubmit() - Web APIs
the htmlformelement method requestsubmit() requests that the form be submitted using a specific submit button. syntax htmlformelement.requestsubmit(submitter); parameters submitter optional the submit button whose attributes describe the method by which the form is to be submitted. this may be either an <input> or <button> element whose type attribute is submit. if you omit the submitter parameter, the form element itself is used as the submitter. return value none. exceptions typeerror the specified submitter is not a submit button. notfounderror the specified submitter isn't a member of the form on which requestsubmit() was called. the submitter must be either a descendant of the form element or must have an form attribute referring to the form. usage notes the obviou...
...pecified submitter isn't a member of the form on which requestsubmit() was called. the submitter must be either a descendant of the form element or must have an form attribute referring to the form. usage notes the obvious question is: why does this method exist, when we've had the submit() method since the dawn of time? the answer is simple. submit() submits the form, but that's all it does. requestsubmit(), on the other hand, acts as if a submit button were clicked. the form's content is validated, and the form is submitted only if validation succeeds. once the form has been submitted, the submit event is sent back to the form object. examples in the example below, the form is submitted by attempting to send the request using requestsubmit() if it's available. if a submit button with the ...
..., the submit event is sent back to the form object. examples in the example below, the form is submitted by attempting to send the request using requestsubmit() if it's available. if a submit button with the id main-submit is found, that's used to submit the form. otherwise, the form is submitted with no submitter parameter, so it's submitted directly by the form itself. if, on the other hand, requestsubmit() isn't available, this code falls back to calling the form's submit() method. ...
...e id main-submit is found, that's used to submit the form. otherwise, the form is submitted with no submitter parameter, so it's submitted directly by the form itself. if, on the other hand, requestsubmit() isn't available, this code falls back to calling the form's submit() method. let myform = document.queryselector("form"); let submitbutton = myform.queryselector("#main-submit"); if (myform.requestsubmit) { if (submitbutton) { myform.requestsubmit(submitbutton); } else { myform.requestsubmit(); } } else { myform.submit(); } specifications specification status comment html living standardthe definition of 'requestsubmit()' in that specification. living standard ...

IDBOpenDBRequest: upgradeneeded event - Web APIs
t is fired when an attempt was made to open a database with a version number higher than its current version. bubbles no cancelable no interface event event handler onupgradeneeded examples this example opens a database and handles the upgradeneeded event by making any necessary updates to the object store. ...
...with a version number higher than its current version. bubbles no cancelable no interface event event handler onupgradeneeded examples this example opens a database and handles the upgradeneeded event by making any necessary updates to the object store. ...
...hours', { unique: false }); objectstore.createindex('minutes', 'minutes', { unique: false }); objectstore.createindex('day', 'day', { unique: false }); objectstore.createindex('month', 'month', { unique: false }); objectstore.createindex('year', 'year', { unique: false }); }); this is the same example, but uses the onupgradeneeded event handler property. ...
...minutes', 'minutes', { unique: false }); objectstore.createindex('day', 'day', { unique: false }); objectstore.createindex('month', 'month', { unique: false }); objectstore.createindex('year', 'year', { unique: false }); }); this is the same example, but uses the onupgradeneeded event handler property. ...

MediaRecorder.requestData() - Web APIs
the mediarecorder.requestdata() method (part of the mediarecorder api) is used to raise a dataavailable event containing a blob object of the captured media as it was when the method was called. this can then be grabbed and manipulated as you wish. when the requestdata() method is invoked, the browser queues a task that runs the following steps: if mediarecorder.state is not "recording", raise a dom invalidstate error and terminate these steps. if mediarecorder.state is "recording", continue to the next step. raise a dataavailable event containing a blob of the currently captured data (the blob is available under the event's data attribute.) create a new blob and place subsequently captured data into it. ...
...eps: if mediarecorder.state is not "recording", raise a dom invalidstate error and terminate these steps. if mediarecorder.state is "recording", continue to the next step. raise a dataavailable event containing a blob of the currently captured data (the blob is available under the event's data attribute.) create a new blob and place subsequently captured data into it. ...
... invalidstate error and terminate these steps. if mediarecorder.state is "recording", continue to the next step. raise a dataavailable event containing a blob of the currently captured data (the blob is available under the event's data attribute.) create a new blob and place subsequently captured data into it. syntax mediarecorder.requestdata() errors an invalidstate error is raised if the requestdata() method is called while the mediarecorder object’s mediarecorder.state is not "recording" — the media cannot be captured if recording is not occurring. example ... capturemedia.onclick = function() { mediarecorder.requestdata(); // makes snapshot available of data so far // ondataavailable fires, then capturing continues // in new blob } ... specifications ...
...the media cannot be captured if recording is not occurring. example ... capturemedia.onclick = function() { mediarecorder.requestdata(); // makes snapshot available of data so far // ondataavailable fires, then capturing continues // in new blob } ... specifications specification status comment mediastream recordingthe definition of 'mediarecorder.requestdata()' in that specification. working draft initial definition ...

PaymentRequest.onpaymentmethodchange - Web APIs
the paymentrequest event handler onpaymentmethodchange is invoked when the paymentmethodchange is fired, indicating that the user has changed payment methods within a given payment handler. for example, when using apple pay, the user can swipe to select different credit cards, debit cards, and so forth. each time the user does so, this event is fired. this event may not be fired by all payment handlers. syntax paymentrequest.addeventlistener('paymentmethodchange', paymentmethodchangeevent => { ... }); paymentrequest.onpaymentmethodchange = function(paymentmethodchangeevent) { ... ...
...me the user does so, this event is fired. this event may not be fired by all payment handlers. syntax paymentrequest.addeventlistener('paymentmethodchange', paymentmethodchangeevent => { ... }); paymentrequest.onpaymentmethodchange = function(paymentmethodchangeevent) { ... }; value an event handler function which is to be called whenever the paymentmethodchange event is fired at the paymentrequest, indicating that the user has changed payment methods within the same payment handler. the paymentmethodchange event is triggered by a user-agent controlled interaction (i.e., the end-user switches from a debit to a credit card in the payment ui). to make sure you receive the event, you should add event listeners to paymentrequest object after instantiation, but before you call show(). examples...
...rolled interaction (i.e., the end-user switches from a debit to a credit card in the payment ui). to make sure you receive the event, you should add event listeners to paymentrequest object after instantiation, but before you call show(). examples an example payment method change handler is shown below; this example handles changes made to the payment method when using apple pay, specifically: request.onpaymentmethodchange = ev => { const { type: cardtype } = ev.methoddetails; const newstuff = {}; if (ev.methodname === "https://apple.com/apple-pay") { switch (cardtype) { case "store": // do apple pay specific handling for store card... // methoddetails contains the store card information const result = calculatediscount(ev.methoddetails); object.
...me === "https://apple.com/apple-pay") { switch (cardtype) { case "store": // do apple pay specific handling for store card... // methoddetails contains the store card information const result = calculatediscount(ev.methoddetails); object.assign(newstuff, result); break; } } // finally... ev.updatewith(newstuff); }; const response = await request.show(); specifications specification status comment payment request apithe definition of 'onpaymentmethodchange' in that specification. candidate recommendation initial definition. ...

PaymentRequest.shippingAddress - Web APIs
the shippingaddress read-only property of the paymentrequest interface returns the shipping address provided by the user. it is null by default. syntax var paymentaddress = paymentrequest.shippingaddress; example generally, the user agent will fill the shippingaddress property value. you can trigger this by setting paymentoptions.requestshipping to true when calling the paymentrequest constructor. in the example below, the cost of shipping varies by geography. when the paymentrequest.onshippingaddresschange is called, updatedetails() is called to update the details of the paymentrequest, using shippingaddress to set the correct shipping cost. // initialization of paymentrequest arguments are excerpted for the sake of // brevity. ...
... the paymentrequest constructor. in the example below, the cost of shipping varies by geography. when the paymentrequest.onshippingaddresschange is called, updatedetails() is called to update the details of the paymentrequest, using shippingaddress to set the correct shipping cost. // initialization of paymentrequest arguments are excerpted for the sake of // brevity. var payment = new paymentrequest(supportedinstruments, details, options); payment.addeventlistener('shippingaddresschange', function(evt) { evt.updatewith(new promise(function(resolve) { updatedetails(details, request.shippingaddress, resolve); })); }); payment.show().then(function(paymentresponse) { // processing of paymentresponse exerpted for brevity. }).catch(function(err) { console.error("uh oh, something ...
... no compatibility data found. please contribute data f...
... specification status comment payment request apithe definition of 'shippingaddress' in that specification. candidate recommendation initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. no compatibility data found. please contribute data for "api.paymentrequest.shippingaddress" (depth: 1) to the mdn compatibility data repository. ...

RTCIceCandidatePairStats.firstRequestTimestamp - Web APIs
the rtcicecandidatepairstats property firstrequesttimestamp specifies the time at which the first stun request was sent on the described candidate pair. syntax firstrequesttimestamp = rtcicecandidatepairstats.firstrequesttimestamp; value a domhighrestimestamp object indicating the timestamp at which the first stun request was sent on the connection described by the described pair of candidates. ...
...timestamp specifies the time at which the first stun request was sent on the described candidate pair. syntax firstrequesttimestamp = rtcicecandidatepairstats.firstrequesttimestamp; value a domhighrestimestamp object indicating the timestamp at which the first stun request was sent on the connection described by the described pair of candidates. ...
...he time at which the first stun request was sent on the described candidate pair. syntax firstrequesttimestamp = rtcicecandidatepairstats.firstrequesttimestamp; value a domhighrestimestamp object indicating the timestamp at which the first stun request was sent on the connection described by the described pair of candidates. ...
...pairstats.firstrequesttimestamp; value a domhighrestimestamp object indicating the timestamp at which the first stun request was sent on the connection described by the described pair of candidates. you can use this value in combination with lastrequesttimestamp and requestssent to compute the average interval between consecutive connectivity checks: avgcheckinterval = (candidatepairstats.lastrequesttimestamp - candidatepairstats.firstrequesttimestamp) / candidatepairstats.requestssent; specifications specification status comment identifiers for webrtc's statistics apithe definition of 'rtcicecandidatepairstats.firstrequesttimestamp' in that specification. candidate recommendation initial specification. ...

USB.requestDevice() - Web APIs
this triggers a user-agent flow that prompts the user to select a device for pairing. ...
...this triggers a user-agent flow that prompts the user to select a device for pairing. ...
... filter objects for possible devices you would like to pair. each filter object can have the following properties: vendorid productid classcode subclasscode protocolcode serialnumber return value a promise that resolves with an instance of usbdevice. example the following example looks for one of two usb devices. notice that two product ids are specified. both are passed to requestdevice(). this triggers a user-agent flow that prompts the user to select a device for pairing. only the selected device is passed to then(). the number of filters does not specifiy the number of devices shown by the user agent. for example, if only a usb device with product id 0xa800 is found, then only one device will be listed by the user agent. on the other hand if the user agent finds two of...
... agent. for example, if only a usb device with product id 0xa800 is found, then only one device will be listed by the user agent. on the other hand if the user agent finds two of the first listed device and one of the second, then all three devices will be listed. const filters = [ {vendorid: 0x1209, productid: 0xa800}, {vendorid: 0x1209, productid: 0xa850} ]; navigator.usb.requestdevice({filters: filters}) .then(usbdevice => { console.log("product name: " + usbdevice.productname); }) .catch(e => { console.log("there is no device. " + e); }); specifications specification status comment webusbthe definition of 'requestdevice' in that specification. draft initial definition. ...

window.requestIdleCallback() - Web APIs
the window.requestidlecallback() method queues a function to be called during a browser's idle periods. this enables developers to perform background and low priority work on the main event loop, without impacting latency-critical events such as animation and input response. functions are generally called in first-in-first-out order; however, callbacks which have a timeout specified may be called out-of-order if necessary in order to run them before the timeout elapses. you can call requestidlecallback() within an idle callback function to schedule another callback to take place no sooner than the next pass through the event loop. a timeout option is strongly recommended for required work, as otherwise it's possible multiple seconds will elapse before the callback is fired. syntax ...
... parameters callback a reference to a function that should be called in the near future, when the event loop is idle. ...
...und tasks api. specifications specification status comment cooperative scheduling of background tasks proposed recommendation initial definition. browser compatibility the compatibility table in this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
...definition. browser compatibility the compatibility table in this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetrequestidlecallback experimentalchrome full support 47edge full support 79firefox full support 55notes full support 55notes notes enabled by default. no support 53 — 55notes notes implemented but di...

XMLHttpRequest.channel - Web APIs
requires elevated privileges to access. ...
...requires elevated privileges to access. ...
...requires elevated privileges to access. ...
...requires elevated privileges to access. ...

XMLHttpRequest.getResponseHeader() - Web APIs
the xmlhttprequest method getresponseheader() returns the string containing the text of a particular header's value. if there are multiple response headers with the same name, then their values are returned as a single concatenated string, where each value is separated from the previous one by a pair of comma and space. the getresponseheader() method returns the value as a utf byte sequence. note: the search for the header name is case-insensitive. if you need to get the raw string of all of the headers, use the getallresponseheaders() method, which returns the entire raw header string. syntax var myheader = xmlhttprequest.getresponseheader(headername); parameters headername a bytestring indicating the name of the header you want to return the text value of. return value a bytestri...
... raw header string. syntax var myheader = xmlhttprequest.getresponseheader(headername); parameters headername a bytestring indicating the name of the header you want to return the text value of. return value a bytestring representing the header's text value, or null if either the response has not yet been received or the header doesn't exist in the response. example in this example, a request is created and sent, and a readystatechange handler is established to look for the readystate to indicate that the headers have been received; when that is the case, the value of the content-type header is fetched. if the content-type isn't the desired value, the xmlhttprequest is canceled by calling abort(). ...
...n't exist in the response. example in this example, a request is created and sent, and a readystatechange handler is established to look for the readystate to indicate that the headers have been received; when that is the case, the value of the content-type header is fetched. if the content-type isn't the desired value, the xmlhttprequest is canceled by calling abort(). ...
...ttprequest(); client.open("get", "unicorns-are-teh-awesome.txt", true); client.send(); client.onreadystatechange = function() { if(this.readystate == this.headers_received) { var contenttype = client.getresponseheader("content-type"); if (contenttype != my_expected_type) { client.abort(); } } } specifications specification status comment xmlhttprequestthe definition of 'getresponseheader()' in that specification. living standard whatwg living standard ...

XMLHttpRequest.readyState - Web APIs
the xmlhttprequest.readystate property returns the state an xmlhttprequest client is in. an xhr client exists in one of the following states: value state description 0 unsent client has been created. open() not called yet. 1 opened open() has been called. 2 headers_received send() has been called, and headers and status are available. 3 loading downloading; responsetext holds partial data. 4 done the operation is complete. unsent the xmlhttprequest client has been created, but the open() method hasn't been called yet. opened open() method has been invoked. ...
...been called. 2 headers_received send() has been called, and headers and status are available. 3 loading downloading; responsetext holds partial data. 4 done the operation is complete. unsent the xmlhttprequest client has been created, but the open() method hasn't been called yet. opened open() method has been invoked. during this state, the request headers can be set using the setrequestheader() method and the send() method can be called which will initiate the fetch. headers_received send() has been called and the response headers have been received. loading response's body is being received. if responsetype is "text" or empty string, responsetext will have the partial text response as it loads. done the fetch operation is complete. ...
...t either the data transfer has been completed successfully or failed. the state names are different in versions of internet explorer earlier than 11. instead of unsent, opened, headers_received, loading and done, the names readystate_uninitialized (0), readystate_loading (1), readystate_loaded (2), readystate_interactive (3) and readystate_complete (4) are used. ...
... will be 0 xhr.open('get', '/api', true); console.log('opened', xhr.readystate); // readystate will be 1 xhr.onprogress = function () { console.log('loading', xhr.readystate); // readystate will be 3 }; xhr.onload = function () { console.log('done', xhr.readystate); // readystate will be 4 }; xhr.send(null); specifications specification status comment xmlhttprequest living standard whatwg living standard ...

XMLHttpRequest.responseText - Web APIs
the read-only xmlhttprequest property responsetext returns the text received from a server following a request being sent. syntax var resulttext = xmlhttprequest.responsetext; value a domstring which contains either the textual data received using the xmlhttprequest or null if the request failed or "" if the request has not yet been sent by calling send(). while handling an asynchronous request, the value of responsetext always has the current content received from the server, even if it's incomplete because the data has not been completely received yet. you know the entire content has been received when the value of readystate becomes xmlhttprequest.done (4), and status becomes 200 ("ok"). ...
...ing send(). while handling an asynchronous request, the value of responsetext always has the current content received from the server, even if it's incomplete because the data has not been completely received yet. you know the entire content has been received when the value of readystate becomes xmlhttprequest.done (4), and status becomes 200 ("ok"). exceptions invalidstateerror the xmlhttprequest.responsetype is not set to either the empty string or "text". since the responsetext property is only valid for text content, any other value is an error condition. ...
...ived yet. you know the entire content has been received when the value of readystate becomes xmlhttprequest.done (4), and status becomes 200 ("ok"). exceptions invalidstateerror the xmlhttprequest.responsetype is not set to either the empty string or "text". since the responsetext property is only valid for text content, any other value is an error condition. ...
...r', true); // if specified, responsetype must be empty string or "text" xhr.responsetype = 'text'; xhr.onload = function () { if (xhr.readystate === xhr.done) { if (xhr.status === 200) { console.log(xhr.response); console.log(xhr.responsetext); } } }; xhr.send(null); specifications specification status comment xmlhttprequest living standard whatwg living standard ...

XMLHttpRequest.withCredentials - Web APIs
the xmlhttprequest.withcredentials property is a boolean that indicates whether or not cross-site access-control requests should be made using credentials such as cookies, authorization headers or tls client certificates. setting withcredentials has no effect on same-site requests. in addition, this flag is also used to indicate when cookies are to be ignored in the response. the default is false. xmlhttprequest from a different domain cannot set cookie values for their own domain unless withcredentials is set to true before making the request. the third-party cookies obtained by setting withcredentials to true will still honor same-origin policy and hence can not be accessed by the requesting script through document.cookie or from response headers. ...
...se. xmlhttprequest from a different domain cannot set cookie values for their own domain unless withcredentials is set to true before making the request. the third-party cookies obtained by setting withcredentials to true will still honor same-origin policy and hence can not be accessed by the requesting script through document.cookie or from response headers. note: this never affects same-site requests. note: xmlhttprequest responses from a different domain cannot set cookie values for their own domain unless withcredentials is set to true before making the request, regardless of access-control- header values. ...
... and hence can not be accessed by the requesting script through document.cookie or from response headers. note: this never affects same-site requests. note: xmlhttprequest responses from a different domain cannot set cookie values for their own domain unless withcredentials is set to true before making the request, regardless of access-control- header values. ...
...esponses from a different domain cannot set cookie values for their own domain unless withcredentials is set to true before making the request, regardless of access-control- header values. ...

XMLHttpRequestEventTarget.onprogress - Web APIs
the xmlhttprequesteventtarget.onprogress is the function called periodically with information when an xmlhttprequest before success completely. syntax xmlhttprequest.onprogress = callback; values callback is the function to be called periodically before the request is completed. event event.loaded the amount of data currently transfered. event.total the total amount of data to be transferred. ...
...venttarget.onprogress is the function called periodically with information when an xmlhttprequest before success completely. syntax xmlhttprequest.onprogress = callback; values callback is the function to be called periodically before the request is completed. event event.loaded the amount of data currently transfered. event.total the total amount of data to be transferred. ...
...ess completely. syntax xmlhttprequest.onprogress = callback; values callback is the function to be called periodically before the request is completed. event event.loaded the amount of data currently transfered. event.total the total amount of data to be transferred. ...
... of data to be transferred. ...

Reason: CORS request did not succeed - HTTP
reason reason: cors request did not succeed what went wrong? ...
... reason reason: cors request did not succeed what went wrong? ...
... reason reason: cors request did not succeed what went wrong? ...
...g the request. other possible causes include: trying to access an https resource that has an invalid certificate will cause this error. trying to access an http resource from a page with an https origin will also cause this error. as of firefox 68, https pages are not permitted to access http://localhost, although this may be changed by bug 1488740. the server did not respond to the actual request (even if it responded to the preflight request). one scenario might be an http service being developed that panicked without returning any data. ...

429 Too Many Requests - HTTP
the http 429 too many requests response status code indicates the user has sent too many requests in a given amount of time ("rate limiting"). a retry-after header might be included to this response indicating how long to wait before making a new request. ...
... the http 429 too many requests response status code indicates the user has sent too many requests in a given amount of time ("rate limiting"). a retry-after header might be included to this response indicating how long to wait before making a new request. ...
... the http 429 too many requests response status code indicates the user has sent too many requests in a given amount of time ("rate limiting"). a retry-after header might be included to this response indicating how long to wait before making a new request. ...
...ser has sent too many requests in a given amount of time ("rate limiting"). a retry-after header might be included to this response indicating how long to wait before making a new request. ...

431 Request Header Fields Too Large - HTTP
the http 431 request header fields too large response status code indicates that the server refuses to process the request because the request’s http headers are too long. the request may be resubmitted after reducing the size of the request headers. 431 can be used when the total size of request headers is too large, or when a single header field is too large. to help those running into this error, indicate which of the two is the problem in the response body — ideally, also include which headers are too large. this lets users attempt to fix the problem, such as by clearing their cookies. ...
...arge, or when a single header field is too large. to help those running into this error, indicate which of the two is the problem in the response body — ideally, also include which headers are too large. ...
... header field is too large. to help those running into this error, indicate which of the two is the problem in the response body — ideally, also include which headers are too large. ...
...onse body — ideally, also include which headers are too large. this lets users attempt to fix the problem, such as by clearing their cookies. ...

The life of an HTML HTTP request - Archive of obsolete content
g of the url is started in nswebshell::doloadurl (called from some loadurl or loaduri variant in the webshell). the webshell then tells its documentloader to load (command "view") the specified url. [note: passes nswebshell.mobserver as nsistreamobserver and the webshell as nsicontentviewercontainer to the docloader.] (2) the document loader calls ns_openuri with the url to begin transfering the requested file. necko (the network library) checks the url scheme (the first part of the url, http: in this case) and locates the correct nsiprotocolhandler (in this case nshttphandler) and asks it for a nsichannel (nshttpchannel). the channel represents the connection to the server, and is the source of the html data stream. (3) when data is starting to come from the webserver the nsichannel calls the ...
.... necko (the network library) checks the url scheme (the first part of the url, http: in this case) and locates the correct nsiprotocolhandler (in this case nshttphandler) and asks it for a nsichannel (nshttpchannel). the channel represents the connection to the server, and is the source of the html data stream. (3) when data is starting to come from the webserver the nsichannel calls the onstartrequest in the documenloader. now the channel knows the content type of the incoming data, so the documentloader can find an nsidocumentloaderfactory for the "text/html" content type (in this case an nslayoutdlf). this factory is then told to create a nsicontentviewer. the factory creates a contentviewer. in most cases (including this) it also creates a nsidocument (nshtmldocument) and binds it to the co...
...es a nsidocument (nshtmldocument) and binds it to the contentviewer. the contentviewer is then embed():ed into the contentviewercontainer (the webshell). (4) the document then creates a nsiparser for parsing the input stream. for html document this is an nsparser, which also implements nsistreamlistener. this streamlistener is returned to the documentloader and connected to the nsichannel of the request. (5) the document (nshtmldocument) also creates a nsicontentsink (nshtmlcontentsink) and connects it to the parser and the document. the parser then parses the stream it gets via its streamlistener interface and converts it to nsiparsernodes which it places in the contentsink. the parser typically gets data from the stream in 8kb blocks and parses these blocks, block by block. after every parse...

BasicCardRequest.supportedTypes - Web APIs
the obsolete supportedtypes property of the basiccardrequest dictionary can optionally be provided to specify an array of domstrings representing the card types that the retailer supports (e.g. credit, debit, prepaid). this property is obsolete and should no longer be used. instead of making the web app or site worry about this, the onus has been transferred to the payment processor. syntax basiccardrequest.supportedtypes = [cardtype1...cardtypen]; value an array containing one or more domstrings, which describe the card types the retailer supports. ...
...transferred to the payment processor. syntax basiccardrequest.supportedtypes = [cardtype1...cardtypen]; value an array containing one or more domstrings, which describe the card types the retailer supports. legal values are defined in basiccardtype enum, and are currently: credit debit prepaid example the following example shows a sample definition of the first parameter of the paymentrequest() constructor, the data property of which contains supportednetworks and supportedtypes properties. var supportedinstruments = [{ supportedmethods: 'basic-card', data: { supportednetworks: ['visa', 'mastercard', 'amex', 'jcb', 'diners', 'discover', 'mir', 'unionpay'], supportedtypes: ['credit', 'debit'] } }]; var details = { ... }; var options = { ... }; ...
...onstructor, the data property of which contains supportednetworks and supportedtypes properties. var supportedinstruments = [{ supportedmethods: 'basic-card', data: { supportednetworks: ['visa', 'mastercard', 'amex', 'jcb', 'diners', 'discover', 'mir', 'unionpay'], supportedtypes: ['credit', 'debit'] } }]; var details = { ... }; var options = { ... }; var request = new paymentrequest(supportedinstruments, details, options); ...

IDBVersionChangeRequest - Web APIs
warning: the latest specification does not include this interface anymore as the idbdatabase.setversion() method has been removed. see the compatibility table for version details. the new way to do it is to use the idbopendbrequest interface which has now the onblocked handler and the newly needed onupgradeneeded one. the idbversionchangerequest interface the indexeddb api represents a request to change the version of a database. it is used only by the setversion() method of idbdatabase. methods inherits from: idbrequest idbversionchangerequest.setversion updates the version of the database. returns immediately and runs a versionchange transaction on the connected database in a separate thread. attributes attribute type description onblocked function ...
...e connected database in a separate thread. attributes attribute type description onblocked function the event handler for the blocked event. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
... browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...

Navigator.requestMediaKeySystemAccess() - Web APIs
the navigator.requestmediakeysystemaccess() method returns a promise which delivers a mediakeysystemaccess object that can be used to access a particular media key system, which can in turn be used to create keys for decrypting a media stream. this method is part of the encrypted media extensions api, which brings support for encrypted media and drm-protected video to the web. this method may have user-visible effects such as asking for permission to access one or more system resources. consider that when deciding when to call requestmediakeysystemaccess(); you don't want those requests to happen at inconvenient times. as a general rule, this function should be called only when it's about time to create and use a mediakeys object by calling the returned mediakeysystemaccess object's createmedia...
...for example com.example.somesystem or org.w3.clearkey. supportedconfigurations a non-empty array of mediakeysystemconfiguration objects. ...
... recommendation initial definition ...

PaymentRequest.shippingType - Web APIs
the shippingtype read-only property of the paymentrequest interface returns one of "shipping", "delivery", "pickup", or null if one was not provided by the constructor. syntax var shippingtype = paymentrequest.shippingtype value one of "shipping", "delivery", "pickup", or null. specifications specification status comment payment request apithe definition of 'shippingtype' in that specification. candidate recommendation initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidf...
...to change preferences in firefox, visit about:config.ie no support noopera no support nosafari full support 11.1webview android no support nochrome android f...
...to change preferences in firefox, visit about:config.opera android no support nosafari ios full support 11.3samsung internet android full support 6.0legend full support ...

PaymentRequest: shippingaddresschange event - Web APIs
that is, the paymentaddress which contains the shipping address may have some portions of its content altered, obscured, or left out entirely in order to prevent identifying the user without their consent (since if they choose to have you ship products to them, you'll need their address). ...
... may have some portions of its content altered, obscured, or left out entirely in order to prevent identifying the user without their consent (since if they choose to have you ship products to them, you'll need their address). example in this example, a handler for the shippingaddresschange event is set up to validate that the address meets requirements set by the web application. const paymentrequest = new paymentrequest(methoddata, details, options); paymentrequest.addeventlistener("shippingaddresschange", event => { let detailsupdate = checkaddress(paymentrequest.shippingaddress); event.updatewith(detailsupate); }, false); const checkaddress = theaddress => { let detailsupdate = {}; // check the address, return a paymentdetailsupdate object // with any changes or errors. ret...
...address(paymentrequest.shippingaddress); event.updatewith(detailsupate); }, false); const checkaddress = theaddress => { let detailsupdate = {}; // check the address, return a paymentdetailsupdate object // with any changes or errors. return detailsupdate; }; you can also establish a handler for shippingaddresschange using the onshippingaddresschange event handler property: paymentrequest.onshippingaddresschange = event => { let detailsupdate = checkaddress(paymentrequest.shippingaddress); event.updatewith(detailsupdate); }; specifications specification status comment payment request apithe definition of 'shippingaddresschange' in that specification. candidate recommendation initial definition. ...

PaymentRequestEvent.total - Web APIs
specifications specification status comment payment handler apithe definition of 'total' in that specification. ...
... specifications specification status comment payment handler apithe definition of 'total' in that specification. ...
... specifications specification status comment payment handler apithe definition of 'total' in that specification. ...

PaymentRequestEvent - Web APIs
the paymentrequestevent interface of the the payment request api is the object passed to a payment handler when a paymentrequest is made. constructor paymentrequestevent() creates a new paymentrequestevent object. properties instrumentkeyread only returns a paymentinstrument object reflecting the payment instrument selected by the user or an empty string if the user has not registered or chosen a payment instrument. methoddataread only returns an array of paymentmethoddata objects containing payment method identifers for the payment methods that the web site accepts and any associated payment method specific data. modifiersread only returns an array of objects containing changes to payment details. ...
...d by the user or an empty string if the user has not registered or chosen a payment instrument. methoddataread only returns an array of paymentmethoddata objects containing payment method identifers for the payment methods that the web site accepts and any associated payment method specific data. modifiersread only returns an array of objects containing changes to payment details. paymentrequestidread only returns the id of the paymentrequest object. paymentrequestoriginread only returns the origin where the paymentrequest object was initialized. toporiginread only returns the top-level origin where the paymentrequest object was initialized. totalread only returns the total amount being requested for payment. methods openwindow() opens the specified url in a new...
... new window, if and only if the given url is on the same origin as the calling page. it returns a promise that resolves with a reference to a windowclient. respondwith() prevents the default event handling and allows you to provide a promise for a paymentresponse object yourself. specifications specification status comment payment handler apithe definition of 'paymentrequestevent' in that specification. working draft initial definition. ...

PaymentRequestUpdateEvent.updateWith() - Web APIs
these represent the line items on a receipt or invoice. error optional a domstring specifying an error message to present to the user. when calling updatewith(), including error in the updated data causes the user agent to display the text as a general error message. for address field specific errors, use shippingaddresserrors. ...
...these represent the line items on a receipt or invoice. error optional a domstring specifying an error message to present to the user. when calling updatewith(), including error in the updated data causes the user agent to display the text as a general error message. for address field specific errors, use shippingaddresserrors. ...
... equals the sum of all of the items in displayitems. this is not calculated automatically. you must update this value yourself anytime the total amount due changes. this lets you have flexibility for how to handle things like tax, discounts, and other adjustments to the total price charged. return value undefined. specifications specification status comment payment request apithe definition of 'paymentrequestupdateevent.updatewith()' in that specification. candidate recommendation initial definition. ...

PaymentRequest.payerName - Web APIs
the payername read-only property of the paymentresponse interface returns the name supplied by the user. this option is only present when the requestpayername option is set to true in the options parameter of the paymentrequest() constructor. syntax var payername = paymentresponse.payername; value a string containing the payer name. specifications specification status comment payment request apithe definition of 'payername' in that specification. candidate recommendation initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. desktopmobilechromeedgefirefoxinternet...
...to change preferences in firefox, visit about:config.ie no support noopera no support nosafari full support yeswebview android no support nochrome android fu...
...to change preferences in firefox, visit about:config.opera android no support nosafari ios full support yessamsung internet android full support 7.0legend full support ...

PaymentResponse.requestId - Web APIs
the requestid read-only property of the paymentresponse interface rreturns the free-form identifier supplied by the paymentresponse() constructor by details.id. syntax var id = paymentrequest.id value a domstring. specifications specification status comment payment request apithe definition of 'requestid' in that specification. candidate recommendation initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetrequ...
...to change preferences in firefox, visit about:config.ie no support noopera no support nosafari full support yeswebview android no support nochrome android fu...
...to change preferences in firefox, visit about:config.opera android no support nosafari ios full support yessamsung internet android full support 8.0legend full support ...

PerformanceResourceTiming.requestStart - Web APIs
the requeststart read-only property returns a timestamp of the time immediately before the browser starts requesting the resource from the server, cache, or local resource. if the transport connection fails and the browser retires the request, the value returned will be the start of the retry request. there is no end property for requeststart. note: this feature is available in web workers. syntax resource.requeststart; return value a domhighrestimestamp representing the time immediately before the browser starts requesting the resource from the server example in the following example, the value of the *start and *end properties of all "resource" type events are logged. function print_performanceentries() { // use getentriesbytype() to just get the "resource" events var p = perform...
..." + properties[i] + " = " + value); } else { console.log("... " + properties[i] + ...
... candidate recommendation initial definition. ...

ReadableStreamBYOBRequest.respondWithNewView() - Web APIs
examples tbd. ...
... examples tbd. ...
... examples tbd. ...

Request.credentials - Web APIs
possible values are: omit: never send or receive cookies. same-origin: send user credentials (cookies, basic http auth, etc..) if the url is on the same origin as the calling script. this is the default value. include: always send user credentials (cookies, basic http auth, etc..), even for cross-origin calls. ...
...possible values are: omit: never send or receive cookies. same-origin: send user credentials (cookies, basic http auth, etc..) if the url is on the same origin as the calling script. this is the default value. include: always send user credentials (cookies, basic http auth, etc..), even for cross-origin calls. ...
...rigin: send user credentials (cookies, basic http auth, etc..) if the url is on the same origin as the calling script. this is the default value. include: always send user credentials (cookies, basic http auth, etc..), even for cross-origin calls. this is similar to xhr’s withcredentials flag, but with three available values instead of two. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then save the request credentials in a variable: var myrequest = new request('flowers.jpg'); var mycred = myrequest.credentials; // returns "same-origin" by default specifications specification status comment fetchthe definition of 'credentials' in that specification. liv...

RequestDestination - Web APIs
"audio" the target is audio data. "audioworklet" the target is data being fetched for use by an audio worklet. "document" the target is a document (html or xml). "embed" the target is embedded content. "font" the target is a font. "image" the target is an image. "manifest" the target is a manifest. "object" the target is an object. ...
... "audio" the target is audio data. "audioworklet" the target is data being fetched for use by an audio worklet. "document" the target is a document (html or xml). "embed" the target is embedded content. "font" the target is a font. "image" the target is an image. "manifest" the target is a manifest. "object" the target is an object. ...
... target is a script. "serviceworker" the target is a service worker. "sharedworker" the target is a shared worker. "style" the target is a style "track" the target is an html <track>. "video" the target is video data. "worker" the target is a worker. "xslt" the target is an xlst transform. specifications specification status comment fetchthe definition of 'requestdestination' in that specification. living standard initial definition ...

Window.requestFileSystem() - Web APIs
the non-standard window method requestfilesystem() method is a google chrome-specific method which lets a web site or app gain access to a sandboxed file system for its own use. the returned filesystem is then available for use with the other file system apis. even compared to the rest of the file and directory entries api, requestfilesystem() is especially non-standard; only chrome implements it, and all other browser makers have decided that they will not implement it. it has even been removed from the proposed specification. do not use this method! syntax this method is prefixed with webkit in all browsers that implement it (that is, google chrome). window.requestfilesystem(type, size, successcallback[, errorcallback]); parameters type the type of storage to request. specify wi...
... specification status comment file and directory entries api draft draft of proposed api this api has no official w3c or whatwg specification. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
...wg specification. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...

XMLHttpRequest.abort() - Web APIs
the xmlhttprequest.abort() method aborts the request if it has already been sent. when a request is aborted, its readystate is changed to xmlhttprequest.unsent (0) and the request's status code is set to 0. syntax xmlhttprequest.abort() parameters none. return value undefined example this example begins loading content from the mdn home page, then due to some condition, aborts the transfer by calling abort(). ...
...e request if it has already been sent. when a request is aborted, its readystate is changed to xmlhttprequest.unsent (0) and the request's status code is set to 0. syntax xmlhttprequest.abort() parameters none. return value undefined example this example begins loading content from the mdn home page, then due to some condition, aborts the transfer by calling abort(). ...
...egins loading content from the mdn home page, then due to some condition, aborts the transfer by calling abort(). ...

XMLHttpRequest: abort event - Web APIs
the abort event is fired when a request has been aborted, for example because the program called xmlhttprequest.abort(). bubbles no cancelable no interface progressevent event handler property onabort examples live example html <div class="controls"> <input class="xhr success" type="button" name="xhr" value="click to start xhr (success)" /> <input class="xhr error" type="button" name="xhr" value="click to start xhr (error)" /> <input class="xhr abort" type="button" name="xhr" value="click to start xhr (abort)" /> </div> <textarea readonly class="event-log"></textarea> css .event-log { width: 25rem; height: 4rem; border: 1px solid black; margin: .5rem; padding: .2rem; } input { width: 11rem; ma...
...ion addlisteners(xhr) { xhr.addeventlistener('loadstart', handleevent); xhr.addeventlistener('load', handleevent); xhr.addeventlistener('loadend', handleevent); xhr.addeventlistener('progress', handleevent); xhr.addeventlistener('error', handleevent); xhr.addeventlistener('abort', handleevent); } function runxhr(url) { log.textcontent = ''; const xhr = new xmlhttprequest(); addlisteners(xhr); xhr.open("get", url); xhr.send(); return xhr; } xhrbuttonsuccess.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.moz...
...ttps://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg').abort(); }); result specifications specification status comment xmlhttprequest living standard ...

XMLHttpRequest: error event - Web APIs
the error event is fired when the request encountered an error. bubbles no cancelable no interface progressevent event handler property onerror examples live example html <div class="controls"> <input class="xhr success" type="button" name="xhr" value="click to start xhr (success)" /> <input class="xhr error" type="button" name="xhr" value="click to start xhr (error)" /> <input class="xhr abort" type="button" name="xhr" value="click to start xhr (abort)" /> </div> <textarea readonly class="event-log"></textarea> css .event-log { width: 25rem; height: 4rem; border: 1px solid black; margin: .5rem; padding: .2rem; } input { width: 11rem; margin: .5rem; } js const xhrbuttonsuccess = document.q...
...ion addlisteners(xhr) { xhr.addeventlistener('loadstart', handleevent); xhr.addeventlistener('load', handleevent); xhr.addeventlistener('loadend', handleevent); xhr.addeventlistener('progress', handleevent); xhr.addeventlistener('error', handleevent); xhr.addeventlistener('abort', handleevent); } function runxhr(url) { log.textcontent = ''; const xhr = new xmlhttprequest(); addlisteners(xhr); xhr.open("get", url); xhr.send(); return xhr; } xhrbuttonsuccess.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.moz...
...ttps://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg').abort(); }); result specifications specification status comment xmlhttprequest living standard ...

XMLHttpRequest: load event - Web APIs
the load event is fired when an xmlhttprequest transaction completes successfully. bubbles no cancelable no interface progressevent event handler property onload examples live example html <div class="controls"> <input class="xhr success" type="button" name="xhr" value="click to start xhr (success)" /> <input class="xhr error" type="button" name="xhr" value="click to start xhr (error)" /> <input class="xhr abort" type="button" name="xhr" value="click to start xhr (abort)" /> </div> <textarea readonly class="event-log"></textarea> css .event-log { width: 25rem; height: 4rem; border: 1px solid black; margin: .5rem; padding: .2rem; } input { width: 11rem; margin: .5rem; } js const xhrbuttonsu...
...ion addlisteners(xhr) { xhr.addeventlistener('loadstart', handleevent); xhr.addeventlistener('load', handleevent); xhr.addeventlistener('loadend', handleevent); xhr.addeventlistener('progress', handleevent); xhr.addeventlistener('error', handleevent); xhr.addeventlistener('abort', handleevent); } function runxhr(url) { log.textcontent = ''; const xhr = new xmlhttprequest(); addlisteners(xhr); xhr.open("get", url); xhr.send(); return xhr; } xhrbuttonsuccess.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.moz...
...ttps://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg').abort(); }); result specifications specification status comment xmlhttprequest living standard ...

XMLHttpRequest: loadend event - Web APIs
the loadend event is fired when a request has completed, whether successfully (after load) or unsuccessfully (after abort or error). bubbles no cancelable no interface progressevent event handler property onloadend examples live example html <div class="controls"> <input class="xhr success" type="button" name="xhr" value="click to start xhr (success)" /> <input class="xhr error" type="button" name="xhr" value="click to start xhr (error)" /> <input class="xhr abort" type="button" name="xhr" value="click to start xhr (abort)" /> </div> <textarea readonly class="event-log"></textarea> css .event-log { width: 25rem; height: 4rem; border: 1px solid black; margin: .5rem; padding: .2rem; } input { width:...
...ion addlisteners(xhr) { xhr.addeventlistener('loadstart', handleevent); xhr.addeventlistener('load', handleevent); xhr.addeventlistener('loadend', handleevent); xhr.addeventlistener('progress', handleevent); xhr.addeventlistener('error', handleevent); xhr.addeventlistener('abort', handleevent); } function runxhr(url) { log.textcontent = ''; const xhr = new xmlhttprequest(); addlisteners(xhr); xhr.open("get", url); xhr.send(); return xhr; } xhrbuttonsuccess.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.moz...
...ttps://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg').abort(); }); result specifications specification status comment xmlhttprequest living standard ...

XMLHttpRequest: loadstart event - Web APIs
the loadstart event is fired when a request has started to load data. bubbles no cancelable no interface progressevent event handler property onloadstart examples live example html <div class="controls"> <input class="xhr success" type="button" name="xhr" value="click to start xhr (success)" /> <input class="xhr error" type="button" name="xhr" value="click to start xhr (error)" /> <input class="xhr abort" type="button" name="xhr" value="click to start xhr (abort)" /> </div> <textarea readonly class="event-log"></textarea> css .event-log { width: 25rem; height: 4rem; border: 1px solid black; margin: .5rem; padding: .2rem; } input { width: 11rem; margin: .5rem; } js const xhrbuttonsuccess = ...
...ion addlisteners(xhr) { xhr.addeventlistener('loadstart', handleevent); xhr.addeventlistener('load', handleevent); xhr.addeventlistener('loadend', handleevent); xhr.addeventlistener('progress', handleevent); xhr.addeventlistener('error', handleevent); xhr.addeventlistener('abort', handleevent); } function runxhr(url) { log.textcontent = ''; const xhr = new xmlhttprequest(); addlisteners(xhr); xhr.open("get", url); xhr.send(); return xhr; } xhrbuttonsuccess.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.moz...
...ttps://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg').abort(); }); result specifications specification status comment xmlhttprequest living standard ...

XMLHttpRequest: progress event - Web APIs
the progress event is fired periodically when a request receives more data. bubbles no cancelable no interface progressevent event handler property onprogress examples live example html <div class="controls"> <input class="xhr success" type="button" name="xhr" value="click to start xhr (success)" /> <input class="xhr error" type="button" name="xhr" value="click to start xhr (error)" /> <input class="xhr abort" type="button" name="xhr" value="click to start xhr (abort)" /> </div> <textarea readonly class="event-log"></textarea> css .event-log { width: 25rem; height: 4rem; border: 1px solid black; margin: .5rem; padding: .2rem; } input { width: 11rem; margin: .5rem; } js const xhrbuttonsucce...
...ion addlisteners(xhr) { xhr.addeventlistener('loadstart', handleevent); xhr.addeventlistener('load', handleevent); xhr.addeventlistener('loadend', handleevent); xhr.addeventlistener('progress', handleevent); xhr.addeventlistener('error', handleevent); xhr.addeventlistener('abort', handleevent); } function runxhr(url) { log.textcontent = ''; const xhr = new xmlhttprequest(); addlisteners(xhr); xhr.open("get", url); xhr.send(); return xhr; } xhrbuttonsuccess.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.moz...
...ttps://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg'); }); xhrbuttonerror.addeventlistener('click', () => { runxhr('https://somewhere.org/i-dont-exist'); }); xhrbuttonabort.addeventlistener('click', () => { runxhr('https://mdn.mozillademos.org/files/16553/dgszyjnxcaipwzy.jpg').abort(); }); result specifications specification status comment xmlhttprequest living standard ...

XMLHttpRequest.responseURL - Web APIs
the read-only xmlhttprequest.responseurl property returns the serialized url of the response or the empty string if the url is null. if the url is returned, any url fragment present in the url will be stripped away. the value of responseurl will be the final url obtained after any redirects. ...
... the read-only xmlhttprequest.responseurl property returns the serialized url of the response or the empty string if the url is null. if the url is returned, any url fragment present in the url will be stripped away. the value of responseurl will be the final url obtained after any redirects. ...
...nt present in the url will be stripped away. the value of responseurl will be the final url obtained after any redirects. ...

XMLHttpRequest.status - Web APIs
the read-only xmlhttprequest.status property returns the numerical http status code of the xmlhttprequest's response. before the request completes, the value of status is 0. browsers also report a status of 0 in case of xmlhttprequest errors. ...
... the read-only xmlhttprequest.status property returns the numerical http status code of the xmlhttprequest's response. before the request completes, the value of status is 0. browsers also report a status of 0 in case of xmlhttprequest errors. ...
...); xhr.open('get', '/server'); console.log('opened: ', xhr.status); xhr.onprogress = function () { console.log('loading: ', xhr.status); }; xhr.onload = function () { console.log('done: ', xhr.status); }; xhr.send(); /** * outputs the following: * * unsent: 0 * opened: 0 * loading: 200 * done: 200 */ specifications specification status comment xmlhttprequest living standard whatwg living standard ...

XMLHttpRequest.statusText - Web APIs
the read-only xmlhttprequest.statustext property returns a domstring containing the response's status message as returned by the http server. unlike xmlhttprequest.status which indicates a numerical status code, this property contains the text of the response status, such as "ok" or "not found". if the request's readystate is in unsent or opened state, the value of statustext will be an empty string. if the server response doesn't explicitly specify a status text, statustext will assume the default value "ok". ...
... xmlhttprequest.status which indicates a numerical status code, this property contains the text of the response status, such as "ok" or "not found". if the request's readystate is in unsent or opened state, the value of statustext will be an empty string. if the server response doesn't explicitly specify a status text, statustext will assume the default value "ok". ...
...t', '/server', true); console.log('1 opened', xhr.statustext); xhr.onprogress = function () { console.log('3 loading', xhr.statustext); }; xhr.onload = function () { console.log('4 done', xhr.statustext); }; xhr.send(null); /** * outputs the following: * * 0 unsent * 1 opened * 3 loading ok * 4 done ok */ specifications specification status comment xmlhttprequest living standard whatwg living standard ...

XMLHttpRequest.timeout - Web APIs
the xmlhttprequest.timeout property is an unsigned long representing the number of milliseconds a request can take before automatically being terminated. the default value is 0, which means there is no timeout. timeout shouldn't be used for synchronous xmlhttprequests requests used in a document environment or it will throw an invalidaccesserror exception. when a timeout happens, a timeout event is fired. note: you may not use a timeout for synchronous requests with an owning window. using a timeout with an asynchronous request in internet explorer, the timeout property may be set only after calling the open() method and before calling the send() method. ...
...nt or it will throw an invalidaccesserror exception. when a timeout happens, a timeout event is fired. note: you may not use a timeout for synchronous requests with an owning window. using a timeout with an asynchronous request in internet explorer, the timeout property may be set only after calling the open() method and before calling the send() method. example var xhr = new xmlhttprequest(); xhr.open('get', '/server', true); xhr.timeout = 2000; // time in milliseconds xhr.onload = function () { // request finished. do processing here. }; xhr.ontimeout = function (e) { // xmlhttprequest timed out. do something here. ...
...alling the send() method. example var xhr = new xmlhttprequest(); xhr.open('get', '/server', true); xhr.timeout = 2000; // time in milliseconds xhr.onload = function () { // request finished. do processing here. }; xhr.ontimeout = function (e) { // xmlhttprequest timed out. do something here. ...

XMLHttpRequest.upload - Web APIs
the following events can be triggered on an upload object and used to monitor the upload: event event listener description loadstart onloadstart the upload has begun. progress onprogress periodically delivered to indicate the amount of progress made so far. abort onabort the upload operation was aborted. error onerror the upload failed due to an error. load onload the upload completed successfully. ...
...ss periodically delivered to indicate the amount of progress made so far. abort onabort the upload operation was aborted. error onerror the upload failed due to an error. load onload the upload completed successfully. timeout ontimeout the upload timed out because a reply did not arrive within the time interval specified by the xmlhttprequest.timeout. loadend onloadend the upload finished. this event does not differentiate between success or failure, and is sent at the end of the upload regardless of the outcome. prior to this event, one of load, error, abort, or timeout will already have been delivered to indicate why the upload ended. specifications specification status comment xmlh...
...meout. loadend onloadend the upload finished. ...

XMLHttpRequestEventTarget.onerror - Web APIs
the xmlhttprequesteventtarget.onerror is the function called when an xmlhttprequest transaction fails due to an error. syntax xmlhttprequest.onerror = callback; values callback is the function to be executed when the request fails. ...
... the xmlhttprequesteventtarget.onerror is the function called when an xmlhttprequest transaction fails due to an error. syntax xmlhttprequest.onerror = callback; values callback is the function to be executed when the request fails. ...
... callback is the function to be executed when the request fails. ...

XMLHttpRequestEventTarget.onload - Web APIs
the xmlhttprequesteventtarget.onload is the function called when an xmlhttprequest transaction completes successfully. syntax xmlhttprequest.onload = callback; values callback is the function to be executed when the request completes successfully. it receives a progressevent object as its first argument. the value of this (i.e. the context) is the same xmlhttprequest this callback is related to. ...
...he function called when an xmlhttprequest transaction completes successfully. syntax xmlhttprequest.onload = callback; values callback is the function to be executed when the request completes successfully. it receives a progressevent object as its first argument. the value of this (i.e. the context) is the same xmlhttprequest this callback is related to. ...
...t) is the same xmlhttprequest this callback is related to. ...

XMLHttpRequestEventTarget.onloadstart - Web APIs
the xmlhttprequesteventtarget.onloadstart is the function called when an xmlhttprequest transaction starts transferring data. syntax xmlhttprequest.onloadstart = callback; values callback is the function to be called when the transaction begins to transfer data. ...
... the xmlhttprequesteventtarget.onloadstart is the function called when an xmlhttprequest transaction starts transferring data. syntax xmlhttprequest.onloadstart = callback; values callback is the function to be called when the transaction begins to transfer data. ...
...es callback is the function to be called when the transaction begins to transfer data. ...

400 Bad Request - HTTP
the hypertext transfer protocol (http) 400 bad request response status code indicates that the server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). the client should not repeat this request without modification. ...
... the hypertext transfer protocol (http) 400 bad request response status code indicates that the server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). the client should not repeat this request without modification. ...
...tes that the server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). the client should not repeat this request without modification. ...

408 Request Timeout - HTTP
the hypertext transfer protocol (http) 408 request timeout response status code means that the server would like to shut down this unused connection. it is sent on an idle connection by some servers, even without any previous request by the client. a server should send the "close" connection header field in the response, since 408 implies that the server has decided to close the connection rather than continue waiting. this response is used much more since some browsers, like chrome, firefox 27+, and ie9, use http pre-connection mechanisms to speed up surfing. note: some servers merely shut down the connection without sending this message. ...
...send the "close" connection header field in the response, since 408 implies that the server has decided to close the connection rather than continue waiting. ...
... to close the connection rather than continue waiting. ...

CORS-safelisted request header - MDN Web Docs Glossary: Definitions of Web-related terms
a cors-safelisted request header is one of the following http headers: accept, accept-language, content-language, content-type. when containing only these headers (and values that meet the additional requirements laid out below), a requests doesn't need to send a preflight request in the context of cors. you can safelist more headers using the access-control-allow-headers header and also list the above headers there to circumvent the following additional restrictions: additional restrictions cors-safelisted headers must also fulfill the following requirements in order to be a cors-safelisted request header: for accept-language and content-language: can only have values consisting of 0-9, a-z, a-z, space or *,-.;=. for accept and content-type: can't contain a cors-unsafe req...
... cors-unsafe request header byte: 0x00-0x1f (except 0x09 (ht)), "():<>?@[\]{}, and 0x7f (del). for content-type: needs to have a mime type of its parsed value (ignoring parameters) of either application/x-www-form-urlencoded, multipart/form-data, or text/plain. for any header: the value’s length can't be greater than 128. ...

Fetch metadata request header - MDN Web Docs Glossary: Definitions of Web-related terms
a fetch metadata request header is a http request header that provides additional information about the context the request originated from. these header names are prefixed with sec- and thus they are forbidden header names so headers can not be modified from javascript. fetch metadata request headers provide the server with additional information about where the request originated from, enabling it to ignore potentially malicious requests. ...
...l information about the context the request originated from. these header names are prefixed with sec- and thus they are forbidden header names so headers can not be modified from javascript. fetch metadata request headers provide the server with additional information about where the request originated from, enabling it to ignore potentially malicious requests. ...

nsIDNSRequest
the listener will passed to asyncresolve will be notified immediately with a status code of ns_error_abort. void cancel(); parameters none. ...
...the listener will passed to asyncresolve will be notified immediately with a status code of ns_error_abort. void cancel(); parameters none. ...

nsIInterfaceRequestor
xpcom/base/nsiinterfacerequestor.idlscriptable this interface defines a generic interface for requesting interfaces that a given object might provide access to. inherits from: nsisupports last changed in gecko 0.9.5 this is similar to nsisupports.queryinterface(). the main difference is that interfaces returned are not required to provide a way back to the object implementing nsiinterfacerequestor. the semantics of nsisupports.queryinterface() dictate that given an interface a that you nsisupports.queryinterface() on to get to interface b, you must be able to nsisupports.queryinterface() on b to get back to a. nsiinterfacerequestor, however, allows you to obtain an interface c from a that may (or most likely) will not have the ability to get back to a. method overview void geti...
... an interface c from a that may (or most likely) will not have the ability to get back to a. method overview void getinterface(in nsiidref uuid, [iid_is(uuid),retval] out nsqiresult result); methods getinterface() retrieves the specified interface pointer. void getinterface( in nsiidref uuid, [iid_is(uuid),retval] out nsqiresult result ); parameters uuid the iid of the interface being requested. result the interface pointer to be filled in if the interface is accessible. exceptions thrown ns_error_no_interface the requested interface is not available. ...

nsIRequestObserver
netwerk/base/public/nsirequestobserver.idlscriptable this interface is used by various streams (such as nsichannel ) to indicate the start and end of a request. inherits from: nsisupports last changed in gecko 1.0 method overview void onstartrequest(in nsirequest arequest, in nsisupports acontext); void onstoprequest(in nsirequest arequest, in nsisupports acontext, in nsresult astatuscode); methods onstartrequest() called to signify the beginning of an asynchronous request. note: an exception thrown from onstartrequest has the side-effect of causing the request to be canceled. void onstartrequest( in nsirequest arequest, in nsisupports acontext ); parameters arequest request being observed. acontext user define...
...statuscode); methods onstartrequest() called to signify the beginning of an asynchronous request. note: an exception thrown from onstartrequest has the side-effect of causing the request to be canceled. void onstartrequest( in nsirequest arequest, in nsisupports acontext ); parameters arequest request being observed. acontext user defined context. onstoprequest() called to signify the end of an asynchronous request. this call is always preceded by a call to onstartrequest(). note: an exception thrown from onstoprequest is generally ignored. void onstoprequest( in nsirequest arequest, in nsisupports acontext, in nsresult astatuscode ); parameters arequest request being observed. acontext user defined context. as...

nsIXMLHttpRequestUpload
content/base/public/nsixmlhttprequest.idlscriptable this interface provides access to the features needed when uploading data using nsixmlhttprequest. ...
...y 2.0) attributes attribute type description onabort nsidomeventlistener onerror nsidomeventlistener onload nsidomeventlistener onloadstart nsidomeventlistener onprogress nsidomeventlistener see also nsixmlhttprequest nsixmlhttprequesteventtarget xmlhttprequest using xmlhttprequest ...

Bluetooth.requestDevice() - Web APIs
the bluetooth.requestdevice() method of the bluetooth interface returns a promise to a bluetoothdevice object with the specified options. if there is no chooser ui, this method returns the first device matching the criteria. syntax bluetooth.requestdevice([options]) .then(function(bluetoothdevice) { ... }) returns a promise to a bluetoothdevice object. parameters options optional an object that sets options for the device request. the available options are: filters[]: an array of bluetoothscanfilters. this filter consists of an array of bluetoothserviceuuids, a name parameter, and a nameprefix parameter. optionalservices[]: an array of bluetoothserviceuuids. acceptalldevices: a boolean indicating that the requesting script can accept all bluetooth devices. the default is f...
...x". // // and enables access to the battery service if devices // include it, even if devices do not advertise that service. let options = { filters: [ {services: ['heart_rate']}, {services: [0x1802, 0x1803]}, {services: ['c48e6067-5295-48d3-8d5c-0395f61792b1']}, {name: 'examplename'}, {nameprefix: 'prefix'} ], optionalservices: ['battery_service'] } navigator.bluetooth.requestdevice(options).then(function(device) { console.log('name: ' + device.name); // do something with the device. }) .catch(function(error) { console.log("something went wrong. " + error); }); detailed examples are in the specification. specifications specification status comment web bluetooththe definition of 'requestdevice()' in that specification. draft initi...

CanvasCaptureMediaStreamTrack.requestFrame() - Web APIs
the canvascapturemediastreamtrack method requestframe() requests that a frame be captured from the canvas and sent to the stream. applications that need to carefully control the timing of rendering and frame capture can use requestframe() to directly specify when it's time to capture a frame. to prevent automatic capture of frames, so that frames are only captured when requestframe() is called, specify a value of 0 for the capturestream() method when creating the stream. syntax stream.requestframe(); return value undefined usage notes there is currently an issue flagged in the specification pointing out that at this time, no exceptions are being thrown if the canvas isn't origin-clean. this may change in the future, so it would be wise to plan ahead and watch for exceptions such as secur...
...h as securityerror (although the specific error that might be thrown is not mentioned in the spec, this is a likely candidate). example // find the canvas element to capture var canvaselt = document.getelementsbytagname("canvas")[0]; // get the stream var stream = canvaselt.capturestream(25); // 25 fps // send the current state of the canvas as a frame to the stream stream.getvideotracks()[0].requestframe(); specifications specification status comment media capture from dom elementsthe definition of 'canvascapturemediastream.requestframe()' in that specification. working draft initial definition ...

FileRequest.onprogress - Web APIs
non-standard this feature is non-standard and is not on a standards track. do not use it on production sites facing the web: it will not work for every user. there may also be large incompatibilities between implementations and the behavior may change in the future. summary this property specifies a callback function to be run repeatedly while the operation represented by a filerequest object is in progress. syntax instanceoffilerequest.onprogress = function; where instanceoffilerequest is a filerequest object and function is the javascript function to execute. each time the function callback is called, it gets an object as its first parameter. those objects contain two properties: loaded a number representing the current amount of bytes processed by the operation. to...
...equest object and function is the javascript function to execute. each time the function callback is called, it gets an object as its first parameter. those objects contain two properties: loaded a number representing the current amount of bytes processed by the operation. total a number representing the total amount of bytes that will be processed by the operation. example // assuming 'request' which is a filerequest object request.onprogress = function (status) { var progress = document.queryselector('progress'); progress.value = status.loaded; progress.max = status.total; } specification not part of any current specification. ...

IDBVersionChangeRequest.setVersion() - Web APIs
the idbversionchangerequest.setversion method updates the version of the database, returning immediately and running a versionchange transaction on the connected database in a separate thread. for older webkit browsers, call this method before creating or deleting an object store. warning: the latest draft of the specification has dropped this method. some not up-to-date browsers still implement this method. the new way is to define the version in the idbdatabase.open() method and create and delete object stores in the onupgradeneeded event handler associated with the returned request. syntax idbversionchangerequest setversion ([treatnullas=emptystring] in domstring version); example tbd parameters version the version to store in the database. ...
...ement this method. the new way is to define the version in the idbdatabase.open() method and create and delete object stores in the onupgradeneeded event handler associated with the returned request. syntax idbversionchangerequest setversion ([treatnullas=emptystring] in domstring version); example tbd parameters version the version to store in the database. returns idbversionchangerequest the request to change the version of a database. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for an...

PaymentRequestEvent() - Web APIs
options optional options are as follows: instrumentkey: a paymentinstrument object reflecting the payment instrument selected by the user or an empty string if the user has not registered or chosen a payment instrument. methoddata: an array of paymentmethoddata objects containing payment method identifers for the payment methods that the web site accepts and any associated payment method specific data. ...
...ting the payment instrument selected by the user or an empty string if the user has not registered or chosen a payment instrument. methoddata: an array of paymentmethoddata objects containing payment method identifers for the payment methods that the web site accepts and any associated payment method specific data. modifiers: an array of objects containing changes to payment details. paymentrequestid: the id of the paymentrequest object. paymentrequestorigin: the origin where the paymentrequest object was initialized. topleveorigin: the top-level origin where the paymentrequest object was initialized. total: the total amount being requested for payment. ...

PaymentRequestEvent.openWindow() - Web APIs
it must be on the same origin as the calling page. return value a promise that resolves with a reference to a windowclient. specifications specification status comment payment handler apithe definition of 'openwindow' in that specification. ...
...it must be on the same origin as the calling page. return value a promise that resolves with a reference to a windowclient. specifications specification status comment payment handler apithe definition of 'openwindow' in that specification. ...

RTCIceCandidatePairStats.requestsReceived - Web APIs
the rtcicecandidatepairstats dictionary's requestsreceived property indicates the total number of stun connectivity check requests that have been received so far on the connection described by this pairing of candidates. syntax requestsreceived = rtcicecandidatepairstats.requestsreceived; value an integer value which specifies the number of stun connectivity and/or consent requests that have been received to date on the connection described by this pair of ice candidates. because there's no way to tell the difference between requests made to check connectivity and requests made to check consent, the returned figure includes both. note: the reported number of requests includes retransmissions. if a request had to be repeated due to network issues, it will be counted multiple times here. th...
...n the connection described by this pair of ice candidates. because there's no way to tell the difference between requests made to check connectivity and requests made to check consent, the returned figure includes both. note: the reported number of requests includes retransmissions. if a request had to be repeated due to network issues, it will be counted multiple times here. this differs from requestssent, which does not include retransmisions. specifications specification status comment identifiers for webrtc's statistics apithe definition of 'rtcicecandidatepairstats.requestsreceived' in that specification. candidate recommendation initial specification. ...

RTCIceCandidatePairStats.requestsSent - Web APIs
the rtcicecandidatepairstats dictionary's requestssent property indicates the total number of stun connectivity check requests that have been sent so far on the connection described by this pair of candidates. syntax requestssent = rtcicecandidatepairstats.requestssent; value an integer value which specifies the number of stun connectivity requests that have been sent to date on the connection described by this pair of ice candidates. note: the reported number of requests does not include retransmissions. if a request had to be repeated due to network issues, it will be counted multiple times here. this differs from requestsreceived, which does include retransmisions. specifications specification status comment identifiers for webrtc's statistics apithe defin...
.... note: the reported number of requests does not include retransmissions. if a request had to be repeated due to network issues, it will be counted multiple times here. this differs from requestsreceived, which does include retransmisions. specifications specification status comment identifiers for webrtc's statistics apithe definition of 'rtcicecandidatepairstats.requestssent' in that specification. candidate recommendation initial specification. ...

ReadableStreamBYOBRequest.respond() - Web APIs
examples tbd. specifications specification status comment streamsthe definition of 'respond()' in that specification. ...
... examples tbd. specifications specification status comment streamsthe definition of 'respond()' in that specification. ...

ReadableStreamBYOBRequest.view - Web APIs
examples tbd. ...
... examples tbd. ...

Request.clone() - Web APIs
the clone() method of the request interface creates a copy of the current request object. clone() throws a typeerror if the response body has already been used. in fact, the main reason clone() exists is to allow multiple uses of body objects (when they are one-use only.) if intend to modify the request, you may prefer the request constructor. syntax var newrequest = request.clone(); parameters none. return value a request object, which is an exact copy of the request that clone() was called on. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then clone the request. ...
...e request, you may prefer the request constructor. syntax var newrequest = request.clone(); parameters none. return value a request object, which is an exact copy of the request that clone() was called on. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then clone the request. var myrequest = new request('flowers.jpg'); var newrequest = myrequest.clone(); // a copy of the request is now stored in newrequest specifications specification status comment fetchthe definition of 'clone' in that specification. living standard initial definition ...

Request.referrerPolicy - Web APIs
the referrerpolicy read-only property of the request interface returns the referrer policy, which governs what referrer information, sent in the referer header, should be included with the request. syntax var myreferrerpolicy = request.referrerpolicy; value a domstring representing the request's referrerpolicy. for more information and possible values, see the referrer-policy http header page. ...
...interface returns the referrer policy, which governs what referrer information, sent in the referer header, should be included with the request. syntax var myreferrerpolicy = request.referrerpolicy; value a domstring representing the request's referrerpolicy. for more information and possible values, see the referrer-policy http header page. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then save the request referrer policy in a variable: var myrequest = new request('flowers.jpg'); var myreferrer = myrequest.referrerpolicy; // returns "" by default specifications specification status comment fetchthe definition of 'referrerpolicy' in that specification. ...

XMLHttpRequest() - Web APIs
the xmlhttprequest() constructor creates a new xmlhttprequest. for details about how to use xmlhttprequest, see using xmlhttprequest. syntax const request = new xmlhttprequest(); parameters none. return value a new xmlhttprequest object. the object must be prepared by at least calling open() to initialize it before calling send() to send the request to the server. non-standard firefox syntax firefox 16 added a non-standard parameter to the constructor that can enable anonymous mode (see bug 692677). setting the mozanon flag to true effectively resembles the anonxmlhttprequest() constructor described in older versions of the xmlhttprequest specification. ...
... least calling open() to initialize it before calling send() to send the request to the server. non-standard firefox syntax firefox 16 added a non-standard parameter to the constructor that can enable anonymous mode (see bug 692677). setting the mozanon flag to true effectively resembles the anonxmlhttprequest() constructor described in older versions of the xmlhttprequest specification. const request = new xmlhttprequest(paramsdictionary); parameters (non-standard) objparameters there are two flags you can set: mozanon boolean: setting this flag to true will cause the browser not to expose the origin and user credentials when fetching resources. most important, this means that cookies will not be sent unless explicitly added using setrequestheader. mozsystem boolean: setting t...

XMLHttpRequestEventTarget.onabort - Web APIs
the xmlhttprequesteventtarget.onabort is the function called when an xmlhttprequest transaction is aborted, such as when the xmlhttprequest.abort() function is called. syntax xmlhttprequest.onabort = callback; values callback is the function to be executed when the transaction is aborted. example var xmlhttp = new xmlhttprequest(), method = 'get', url = 'https://developer.mozilla.org/'; xmlhttp.open(method, url, true); xmlhttp.onabort = function () { console.log('** the request was aborted'); }; xmlhttp.send(); //.. ...
...tion is aborted. example var xmlhttp = new xmlhttprequest(), method = 'get', url = 'https://developer.mozilla.org/'; xmlhttp.open(method, url, true); xmlhttp.onabort = function () { console.log('** the request was aborted'); }; xmlhttp.send(); //.. ...

Reason: CORS request not HTTP - HTTP
local file security in firefox 68 when a user opened a page using a file:/// uri in firefox 67 and earlier, the origin of the page was defined as the directory from which the page was opened. resources in the same directory and its subdirectories were treated as having the same origin for purposes of the cors same-origin rule. ...
... local file security in firefox 68 when a user opened a page using a file:/// uri in firefox 67 and earlier, the origin of the page was defined as the directory from which the page was opened. resources in the same directory and its subdirectories were treated as having the same origin for purposes of the cors same-origin rule. ...

Upgrade-Insecure-Requests - HTTP
the http upgrade-insecure-requests request header sends a signal to the server expressing the client’s preference for an encrypted and authenticated response, and that it can successfully handle the upgrade-insecure-requests csp directive. header type request header forbidden header name no syntax upgrade-insecure-requests: 1 examples a client's request signals to the server that it supports the upgrade mechanisms of upgrade-insecure-requests: get / http/1.1 host: example.com upgrade-insecure-requests: 1 the server can now redirect to a secure version of the site. a vary header can be used so that the site isn't served by caches to clients that don’t support the upgrade mechanism. ...
...equest signals to the server that it supports the upgrade mechanisms of upgrade-insecure-requests: get / http/1.1 host: example.com upgrade-insecure-requests: 1 the server can now redirect to a secure version of the site. a vary header can be used so that the site isn't served by caches to clients that don’t support the upgrade mechanism. location: https://example.com/ vary: upgrade-insecure-requests specifications specification status comment upgrade insecure requeststhe definition of 'upgrade-insecure-requests' in that specification. candidate recommendation initial definition. ...

CRMF Request object - Archive of obsolete content
this page to guide your decision. be aware that this feature may cease to work at any time. warning: the features mentioned in this article are deleted proprietary mozilla extensions, and are not supported in any other browser. they won't work in firefox 34 or later. use <keygen> or the future web crypto api instead. rfc 4211, the internet x.509 public key infrastructure certificate request message format (crmf), defines a certreqmessage. the object returned by generatecrmfrequest() contains one of those. ...

XHR (XMLHttpRequest) - MDN Web Docs Glossary: Definitions of Web-related terms
xmlhttprequest (xhr) is a javascript api to create ajax requests. its methods provide the ability to send network requests between the browser and a server. learn more general knowledge xmlhttprequest on wikipedia synchronous vs. asynchronous communications technical information the xmlhttprequest object. the documentation on mdn about how to use xmlhttprequest. ...

Blocked: All storage access requests
message firefox: cookieblockedall=request to access cookies or storage on “x” was blocked because we are blocking all storage access requests. what went wrong? a request to access cookies or storage was blocked because the browser is blocking all storage access. the permission can be changed or removed by: going to preferences > content blocking in the custom content blocking section, selecting a value other than all cookies for the cookies item if the resource that is being blocked doesn't need authentication, you can fix the warning message by adding a crossorigin="anonymous" attribute to your element. ...

Blocked: All third-party storage access requests
message firefox: cookieblockedforeign=request to access cookies or storage on “x” was blocked because we are blocking all third-party storage access requests and content blocking is enabled. what went wrong? a request to access cookies or storage was blocked because it came from a third-party (a different origin) and content blocking is enabled. the permission can be changed or removed by: going to preferences > content blocking and either adding an exception with the manage exceptions… button choosing the custom content blocking and unchecking the cookies checkbox if the resource that is being blocked doesn't need authentication, you can fix the warning message by adding a crossorigin="anonymous" attribute to the relevant element. ...

Blocked: Storage access requests from trackers
message firefox: cookieblockedtracker=request to access cookies or storage on “x” was blocked because it came from a tracker and content blocking is enabled. what went wrong? a request to access cookies or storage was blocked because the browser identified it as coming from a tracker and content blocking is enabled. the permission can be changed or removed by: going to preferences > content blocking and either adding an exception with the manage exceptions… button choosing the custom content blocking and unchecking the tracker checkbox if the blocked resource doesn't need authentication, you can fix the warning message by adding a crossorigin="anonymous" attribute to the relevant element. ...

Partitioned: All third-party storage access requests
...

Element.requestPointerLock() - Web APIs
the element.requestpointerlock() method lets you asynchronously ask for the pointer to be locked on the given element. to track the success or failure of the request, it is necessary to listen for the pointerlockchange and pointerlockerror events at the document level. syntax instanceofelement.requestpointerlock(); specifications specification status comment pointer lockthe definition of 'requestpointerlock()' in that specification. candidate recommendation ...

FileRequest.lockedFile - Web APIs
non-standard this feature is non-standard and is not on a standards track. do not use it on production sites facing the web: it will not work for every user. there may also be large incompatibilities between implementations and the behavior may change in the future. summary the lockedfile property represents the lockedfile object from which the request was started. syntax var lockedfile = instanceoffilerequest.lockedfile value a lockedfile object. specifications specification status comment filesystem api editor's draft draft proposal. ...

FileRequest - Web APIs
non-standard this feature is non-standard and is not on a standards track. do not use it on production sites facing the web: it will not work for every user. there may also be large incompatibilities between implementations and the behavior may change in the future. summary the filerequest interface extends the domrequest interface to provide some extra properties necessary for the lockedfile objects. properties filerequest.lockedfile read only the lockedfile object from which the request was started. filerequest.onprogress a callback handler called repeatedly while the operation represented by the filerequest is in progress. the filerequest interface also inherits from the domrequest interface. methods none. specifications specification status ...

generateRequest() - Web APIs
the mediakeysession.generaterequest() method returns a promise after generating a media request based on initialization data. syntax mediakeysession.generaterequest().then(function) { ... }); specifications specification status comment encrypted media extensionsthe definition of 'generaterequest()' in that specification. recommendation initial definition ...

PaymentRequestEvent.instrumentKey - Web APIs
the instrumentkey read-only property of the paymentrequestevent interface returns a paymentinstrument object reflecting the payment instrument selected by the user or an empty string if the user has not registered or chosen a payment instrument. syntax var instrumentkey = paymentrequestevent.instrumentkey value a paymentinstrument object. specifications specification status comment payment handler apithe definition of 'instrumentkey' in that specification. working draft initial definition. ...

PaymentRequestEvent.methodData - Web APIs
the methoddata read-only property of the paymentrequestevent interface returns an array of paymentmethoddata objects containing payment method identifers for the payment methods that the web site accepts and any associated payment method specific data. syntax var methoddata[] = paymentrequestevent.methoddata value an array of paymentmethoddata objects. specifications specification status comment payment handler apithe definition of 'methoddata' in that specification. working draft initial definition. ...

PaymentRequestEvent.modifiers - Web APIs
syntax var modifiers[] = paymentdetailsevent.modifiers value an array of modifier objects. ...

paymentRequestId - Web APIs
the paymentrequestid read-only property of the paymentrequestevent interface returns the id of the paymentrequest object. syntax var id = paymentrequestevent.paymentrequestid value a domstring contains the id. specifications specification status comment payment handler apithe definition of 'paymentrequestid' in that specification. working draft initial definition. ...

PaymentRequestEvent.respondWith() - Web APIs
) parameters promise a promise that resolves with a paymentresponse object. return value a paymentresponse object. specifications specification status comment payment handler apithe definition of 'respondwith' in that specification. ...

PaymentRequestEvent.topOrigin - Web APIs
the toporigin read-only property of the paymentrequestevent interface returns the top level payee origin where the paymentrequest object was initialized. syntax var ausvstring = paymentrequestevent.toporigin value a usvstring specifications specification status comment payment handler apithe definition of 'toporigin' in that specification. working draft initial definition. ...

PerformanceTiming.requestStart - Web APIs
this interface of this property is deprecated in the navigation timing level 2 specification. please use the performancenavigationtiming interface instead. the legacy performancetiming.requeststart read-only property returns an unsigned long long representing the moment, in miliseconds since the unix epoch, when the browser sent the request to obtain the actual document, from the server or from a cache. if the transport layer fails after the start of the request and the connection is reopened, this property will be set to the time corresponding to the new request. syntax time = performancetiming.requeststart; specifications specification status comment navigation timingthe definition of 'performancetiming.requeststart' in that specification. recommendation in...

PublicKeyCredentialRequestOptions.allowCredentials - Web APIs
allowcredentials is an optional property of the publickeycredentialrequestoptions dictionary which indicates the existing credentials acceptable for retrieval. this is an array of credential descriptors. note: publickeycredentialcreationoptions.excludecredentials may be used during the creation of the credentials in order to avoid creating new credentials for an existing user with existing public key credential. contrary to allowcredentials, it is used to filter out credentials. syntax allowcredentials = publickeycredentialrequestoptions.allowcredentials value an array whose elements are objects with the following properties: type a string describing type of public-key credential to be created. as of this writing (march 2019), only "public-key" may be used. id a buffersource match...

PublicKeyCredentialRequestOptions.challenge - Web APIs
the challenge property of the publickeycredentialrequestoptions dictionary is a buffersource used as a cryptographic challenge. this is randomly generated then sent from the relying party's server. this value (among other client data) will be signed by the authenticator's private key and produce authenticatorassertionresponse.signature which should be sent back to the server as part of the response. note: when the credential is created with a navigator.credentials.create() call, the signature of the challenge is contained within authenticatorattestationresponse.attestationobject. note: a challenge will be at least 16 bytes long. syntax challenge = publickeycredentialrequestoptions.challenge value a buffersource which is at least 16 bytes long. contains a cryptographic challenge emitt...

PublicKeyCredentialRequestOptions.extensions - Web APIs
extensions, an optional property of the publickeycredentialrequestoptions dictionary, is an object providing the client extensions and their input values. extensions are values requesting additional processing by the client and by the authenticator. for instance, extensions may be used for: backward compatibility with the legacy fido js api, knowing the user verification process, etc. note: an analogous option exists for the creation operation (navigators.credentials.create()), see publickeycredentialcreationoptions.extensions. syntax extensions = publickeycredentialrequestoptions.extensions value an object with various keys and values. here is the current (as of march 2019) list of potential extensions which may be used during the registration operation. warning! as of june 2...

PublicKeyCredentialRequestOptions.rpId - Web APIs
the rpid property, of the publickeycredentialrequestoptions dictionary, is an optional property which indicates the relying party's identifier as a usvstring. its value can only be a suffix of the current origin's domain. for example, if you are browsing on foo.example.com, the rpid value may be "example.com" but not "bar.org" or "baz.example.com". this property is optional. if it is not explicitely provided, the user agent will use the value of the current origin's domain. note: an analogous option exists for the creation operation (navigators.credentials.create()), see the id property of publickeycredentialcreationoptions.rp. syntax rpid = publickeycredentialrequestoptions.rpid value a usvstring for the identifier of the relying party. its value can only be a suffix of the current or...

PublicKeyCredentialRequestOptions.timeout - Web APIs
the timeout property, of the publickeycredentialrequestoptions dictionary, represents an hint, given in milliseconds, for the time the script is willing to wait for the completion of the retrieval operation. this property is optional and merely is a hint which may be overridden by the browser. note: an analogous option exists for the creation operation (navigators.credentials.create()), see publickeycredentialcreationoptions.timeout. syntax timeout = publickeycredentialrequestoptions.timeout value a numerical hint, expressed in milliseconds, giving the time to wait for the creation operation to complete. examples var options = { challenge: new uint8array([/* bytes sent from the server */]), timeout: 6000 // wait a minute for the fetching operation // and maybe f...

PublicKeyCredentialRequestOptions.userVerification - Web APIs
userverification is an optional property of the publickeycredentialrequestoptions. this is a string which indicates how the user verification should be part of the authentication process. note: an analogous option exists for the creation operation (navigators.credentials.create()), see the userverification property of publickeycredentialcreationoptions.authenticatorselection. syntax userverification = publickeycredentialrequestoptions.userverification value a string qualifying how the user verification should be part of the authentication process. the values may be: "required": user verification is required, the operation will fail if the response does not have the uv flag (as part of authenticatorassertionresponse.authenticatordata) "preferred": user verification is prefered, the o...

RTCIceCandidatePairStats.consentRequestsSent - Web APIs
the rtcicecandidatepairstats property consentrequestssent specifies the number of consent requests that have been sent by this peer to the remote peer on the connection described by the pair of candidates. syntax consentrequestssent = rtcicecandidatepairstats.consentrequestssent; value an integer indicating the number of consent requests this peer has sent to the other peer over the connection described by the pair of candidates referenced by this rtcicecandidatepairstats object. specifications specification status comment identifiers for webrtc's statistics apithe definition of 'rtcicecandidatepairstats.consentrequestssent' in that specification. candidate recommendation initial specification. ...

ReadableByteStreamController.byobRequest - Web APIs
the byobrequest read-only property of the readablebytestreamcontroller interface returns the current byob pull request, or undefined if there are no pending requests. syntax var request = readablebytestreamcontroller.byobrequest; value a readablestreambyobrequest object instance, or undefined. examples tbd. specifications specification status comment streamsthe definition of 'byobrequest' in that specification. living standard initial definition. ...

ReadableStreamBYOBRequest - Web APIs
the readablestreambyobrequest interface of the streams api represents a pull request into a readablebytestreamcontroller view. a view, as mentioned below, refers to a typed array representing the destination region to which the associated readablebytestreamcontroller controller can write generated data. constructor none. readablestreambyobrequest instance is created automatically by readablebytestreamcontroller as needed. properties readablestreambyobrequest.view read only returns the current view. methods readablestreambyobrequest.respond() xxx readablestreambyobrequest.respondwithnewview() xxx examples tbd. specifications specification status comment streamsthe definition of 'readablestreambyobrequest' in that specification. living standar...

Request.integrity - Web APIs
the integrity read-only property of the request interface contains the subresource integrity value of the request. syntax var myintegrity = request.integrity; value the subresource integrity value of the request (e.g., sha256-bpfbw7ivv8q2jlit13fxdyae2tjllusrsz273h2nfse=). if an integrity has not been specified, the property returns ''. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then save the request integrity value in a variable: var myrequest = new request('flowers.jpg'); var myintegrity = myrequest.integrity; specifications specification status comment fetchthe definition of 'integrity' in that specification. living standard initial definition ...

Request.method - Web APIs
the method read-only property of the request interface contains the request's method (get, post, etc.) syntax var mymethod = request.method; value a bytestring indicating the method of the request. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then save the method of the request in a variable: var myrequest = new request('flowers.jpg'); var mymethod = myrequest.method; // get specifications specification status comment fetchthe definition of 'method' in that specification. living standard initial definition ...

Request.redirect - Web APIs
the redirect read-only property of the request interface contains the mode for how redirects are handled. syntax var myredirect = request.redirect; value a requestredirect enum value, which can be one the following strings: follow error manual if not specified when the request is created, it takes the default value of follow. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then save the request redirect value in a variable: var myrequest = new request('flowers.jpg'); var mycred = myrequest.redirect; specifications specification status comment fetchthe definition of 'redirect' in that specification. living standard initial definition ...

Request.referrer - Web APIs
the referrer read-only property of the request interface is set by the user agent to be the referrer of the request. (e.g., client, no-referrer, or a url.) note: if referrer's value is no-referrer, it returns an empty string. syntax var myreferrer = request.referrer; value a domstring representing the request's referrer. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then save the request referrer in a variable: var myrequest = new request('flowers.jpg'); var myreferrer = myrequest.referrer; // returns "about:client" by default specifications specification status comment fetchthe definition of 'referrer' in that specification. living standard initi...

Request.url - Web APIs
the url read-only property of the request interface contains the url of the request. syntax var myurl = request.url; value a usvstring indicating the url of the request. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then save the url of the request in a variable: var myrequest = new request('flowers.jpg'); var myurl = myrequest.url; // "http://mdn.github.io/fetch-examples/fetch-request/flowers.jpg" specifications specification status comment fetchthe definition of 'url' in that specification. living standard initial definition ...

XDomainRequest.abort() - Web APIs
aborts an xdomainrequest. syntax xdr.abort(); example var xdr = new xdomainrequest(); xdr.open("get", "http://example.com/api/method"); xdr.send(); xdr.abort(); specification not part of any specification. ...

XDomainRequest.onerror - Web APIs
an event handler which is called when an xdomainrequest encounters an error. note: there is no way to determine the cause of the error from the xdomainrequest interface. syntax xdr.onerror = funcref; parameters funcref a function to call when an error occurs. example var xdr = new xdomainrequest(); xdr.open("post", "http://example.com/api/method"); xdr.onerror = function(){ //handle error } xdr.onload = function(){ //handle response with xdr.responsetext } xdr.send("param1=value1&param2=value2"); specification not part of any specification. ...

XDomainRequest.onload - Web APIs
an event handler for when an xdomainrequest has finished receiving the response from the server. you can find the entire server response in the xdomainrequest.responsetext property. syntax xdr.onload = funcref; example var xdr = new xdomainrequest(); xdr.open("post", "http://example.com/api/method"); xdr.onload = function(){ //handle response with xdr.responsetext } xdr.send("param1=value1&param2=value2"); specification not part of any specification. ...

XDomainRequest.onprogress - Web APIs
this method is called periodically as an event handler for progress events on xdomainrequests, so that code can monitor progress while loading content. note: while handling this event, you can look at xdomainrequest.responsetext to get the response so far. once loading is complete, the xdomainrequest.onload event handler gets called. syntax xdr.onprogress = funcref; parameters funcref a function to call when progress events occur. example var xdr = new xdomainrequest(); xdr.open("post", "http://example.com/api/method"); xdr.onprogress = function(){ //handle partial response with xdr.responsetext } xdr.onload = function(){ //handle response with xdr.responsetext } xdr.send("param1=value1&param2=value2"); specification not part of any specification. ...

XDomainRequest.ontimeout - Web APIs
an event handler which is called when a pending xdomainrequest times out. syntax xdr.ontimeout = funcref; parameters funcref a function to be called when the event times out. example var xdr = new xdomainrequest(); xdr.open("post", "http://example.com/api/method"); xdr.ontimeout = function(){ //handle timeout } xdr.onload = function(){ //handle response with xdr.responsetext } xdr.send("param1=value1&param2=value2"); specification not part of any specification. ...

XDomainRequest.open() - Web APIs
opens an xdomainrequest which is configured to use a given method (get/post) and url. syntax xdr.open(method, url); parameters method the http method to use for the request. (get or post) url the url to which to send the request. example var xdr = new xdomainrequest(); xdr.open("get", "http://example.com/api/method"); specification not part of any specification. ...

XDomainRequest.responseText - Web APIs
returns the response body of an xdomainrequest as a string. note: this property is valid during the xdomainrequest.onprogress and xdomainrequest.onload events. syntax var response = xdr.responsetext; this sets response to contain the response body of the request, as a string. example var response = xdr.responsetext; specification not part of any specification. ...

XDomainRequest.send() - Web APIs
sends an xdomainrequest which has previously been opened calling xdomainrequest.open(). syntax xdr.send(data); parameters data the form data to be sent with the request. this parameter is optional for get requests. example var xdr = new xdomainrequest(); xdr.open("post", "http://example.com/api/method"); xdr.onload = function(){ //handle response with xdr.responsetext } xdr.send("param1=value1&param2=value2"); specification not part of any specification. ...

XDomainRequest.timeout - Web APIs
syntax xdr.timeout = milliseconds; the default value is 0. ...

XMLHttpRequest.mozAnon - Web APIs
xmlhttprequest.mozanon is a boolean. if true, the request will be sent without cookies or authentication headers. ...

XMLHttpRequest.mozResponseArrayBuffer - Web APIs
obsolete since gecko 6 is an arraybuffer response to the request, written as a javascript typed array. this is null if the request was not successful, or if it hasn't been sent yet. ...

XMLHttpRequest.mozSystem - Web APIs
...

XMLHttpRequest.multipart - Web APIs
obsolete since gecko 22 this gecko-only feature was removed in firefox/gecko 22. please use server-sent events, web sockets, or responsetext from progress events instead. this boolean indicates if the response is expected to be a stream of possibly multiple xml documents. if set to true, the content type of the initial response must be multipart/x-mixed-replace or an error will occur. all requests must be asynchronous. this enables support for server push; for each xml document that's written to this request, a new xml dom document is created and the onload handler is called between documents. note: when this is set, the onload handler and other event handlers are not reset after the first xmldocument is loaded, and the onload handler is called after each part of the response is receiv...

XMLHttpRequest: timeout event - Web APIs
the timeout event is fired when progression is terminated due to preset time expiring. bubbles no cancelable no interface progressevent event handler property ontimeout examples const client = new xmlhttprequest(); client.open('get', 'http://www.example.org/example.txt'); client.ontimeout = () => { console.error('timeout!!') }; client.send(); you could also set up the event handler using the addeventlistener() method: client.addeventlistener('timeout', () => { console.error("timeout!!"); }); specifications specification status comment xmlhttprequestthe definition of 'timeout event' in that specification. living standard ...

XRFrameRequestCallback - Web APIs
the xrframerequestcallback is a callback function passed into xrsession.requestanimationframe (part of webxr api) to obtain the current time and the current xrframe. syntax function xrframerequestcallback(time, xrframe){ // process xrframe here } xrsession.requestanimationframe(xrframerequestcallback) parameters domhighrestimestamp a timestamp corresponding to the returned xrframe. xrframe an xrframe representing a snapshot of the state of all of the tracked objects for the xrsession. return value none. specifications specification status comment webxr device apithe definition of 'xrframerequestcallback' in that specification. working draft initial definition. ...

Reason: CORS request external redirect not allowed - HTTP
reason reason: cors request external redirect not allowed what went wrong? the cors request was responded to by the server with an http redirect to a url on a different origin than the original request, which is not permitted during cors requests. for example, if the page https://service.tld/fetchdata were requested, and the http response is "301 moved permanently", "307 temporary redirect", or "308 permanent redirect" with a location of https://anotherservice.net/getdata, the cors request will fail in this manner. to fix the problem, update your code to use the new url as reported by the redirect, thereby avoiding the redirect. ...

Access-Control-Request-Headers - HTTP
the access-control-request-headers request header is used by browsers when issuing a preflight request, to let the server know which http headers the client might send when the actual request is made. header type request header forbidden header name yes syntax access-control-request-headers: <header-name>, <header-name>, ... directives <header-name> a comma-delimited list of http headers that are included in the request. examples access-control-request-headers: x-pingother, content-type specifications specification status comment fetchthe definition of 'access-control-request-headers' in that specification. living standard initial definition. ...

Access-Control-Request-Method - HTTP
the access-control-request-method request header is used by browsers when issuing a preflight request, to let the server know which http method will be used when the actual request is made. this header is necessary as the preflight request is always an options and doesn't use the same method as the actual request. header type request header forbidden header name yes syntax access-control-request-method: <method> directives <method> one of the http request methods, for example get, post, or delete. examples access-control-request-method: post specifications specification status comment fetchthe definition of 'access-control-request-method' in that specification. living standard initial definition. ...

Index - Web APIs
of the webgl api modifies the rate at which generic vertex attributes advance when rendering multiple instances of primitives with ext.drawarraysinstancedangle() and ext.drawelementsinstancedangle(). 6 abortcontroller api, abortcontroller, experimental, interface, reference the abortcontroller interface represents a controller object that allows you to abort one or more dom requests as and when desired. 7 abortcontroller.abortcontroller() api, abortcontroller, constructor, experimental, fetch, reference the abortcontroller() constructor creates a new abortcontroller object instance. 8 abortcontroller.abort() api, abortcontroller, experimental, fetch, method, reference, abort() the abort() method of the abortcontroller interface abor...
...when desired. 7 abortcontroller.abortcontroller() api, abortcontroller, constructor, experimental, fetch, reference the abortcontroller() constructor creates a new abortcontroller object instance. 8 abortcontroller.abort() api, abortcontroller, experimental, fetch, method, reference, abort() the abort() method of the abortcontroller interface aborts a dom request (e.g. a fetch request) before it has completed. this is able to abort fetch requests, consumption of any response body, and streams. 9 abortcontroller.signal api, abortcontroller, experimental, fetch, property, reference, signal the signal read-only property of the abortcontroller interface returns an abortsignal object instance, which can be used to communicate with/abort a ...
...g. a fetch request) before it has completed. this is able to abort fetch requests, consumption of any response body, and streams. 9 abortcontroller.signal api, abortcontroller, experimental, fetch, property, reference, signal the signal read-only property of the abortcontroller interface returns an abortsignal object instance, which can be used to communicate with/abort a dom request as desired. 10 abortsignal api, abortsignal, dom, experimental, interface, reference the abortsignal interface represents a signal object that allows you to communicate with a dom request (such as a fetch) and abort it if required via an abortcontroller object. 11 abortsignal.aborted api, abortsignal, experimental, property, reference, aborted the aborted...
...And 451 more matches

HTTP Index - HTTP
hypertext, reference, tcp/ip, web, web development, l10n:priority hypertext transfer protocol (http) is an application-layer protocol for transmitting hypermedia documents, such as html. it was designed for communication between web browsers and web servers, but it can also be used for other purposes. http follows a classical client-server model, with a client opening a connection to make a request, then waiting until it receives a response. http is a stateless protocol, meaning that the server does not keep any data (state) between two requests. though often based on a tcp/ip layer, it can be used on any reliable transport layer, that is, a protocol that doesn't lose messages silently like udp does. rudp — the reliable update of udp — is a suitable alternative. 2 a typical h...
...ike udp does. rudp — the reliable update of udp — is a suitable alternative. 2 a typical http session http in client-server protocols, like http, sessions consist of three phases: 3 an overview of http html, http, overview, webmechanics, l10n:priority http isthe foundation of any data exchange on the web and it is a client-server protocol, which means requests are initiated by the recipient, usually the web browser. a complete document is reconstructed from the different sub-documents fetched, for instance text, layout description, images, videos, scripts, and more 4 basics of http guide, http, overview http is a pretty extensible protocol. it relies on a few basic concepts like the notion of resources and uris, a simple structure...
...ng protocol of the world wide web. http has evolved from an early protocol to exchange files in a semi-trusted laboratory environment, to the modern maze of the internet, now carrying images, videos in high resolution and 3d. ...
...And 140 more matches

Index - HTTP
found 122 pages: # page tags and summary 1 http headers http, http header, networking, overview, reference http headers allow the client and the server to pass additional information with the request or the response. an http header consists of its case-insensitive name followed by a colon ':', then by its value (without line breaks). leading white space before the value is ignored. 2 accept http, http header, reference, request header the accept request http header advertises which content types, expressed as mime types, the client is able to understand. using content negotiation, the server then selects one of the proposals, uses it and informs the client of its choice with the content-type response header. browsers set adequate values f...
... header, reference, request header the accept request http header advertises which content types, expressed as mime types, the client is able to understand. using content negotiation, the server then selects one of the proposals, uses it and informs the client of its choice with the content-type response header. browsers set adequate values for this header depending on the context where the request is done: when fetching a css stylesheet a different value is set for the request than when fetching an image, video or a script. 3 accept-charset content negotiation, http, http header, reference, request header the accept-charset request http header advertises which character set the client is able to understand. using content negotiation, the server then selects one of the ...
... using content negotiation, the server then selects one of the proposals, uses it and informs the client of its choice within the content-type response header. browsers usually don't set this header as the default value for each content type is usually correct and transmitting it would allow easier fingerprinting. 4 accept-encoding content negotiation, http, http header, reference, request header the accept-encoding request http header advertises which content encoding, usually a compression algorithm, the client is able to understand. using content negotiation, the server selects one of the proposals, uses it and informs the client of its choice with the content-encoding response header. 5 accept-language content negotiation, http, http header, reference, requ...
...And 58 more matches

Cross-Origin Resource Sharing (CORS) - HTTP
cross-origin resource sharing (cors) is a mechanism that uses additional http headers to tell browsers to give a web application running at one origin, access to selected resources from a different origin. a web application executes a cross-origin http request when it requests a resource that has a different origin (domain, protocol, or port) from its own. an example of a cross-origin request: the front-end javascript code served from https://domain-a.com uses xmlhttprequest to make a request for https://domain-b.com/data.json. ...
...ent origin. a web application executes a cross-origin http request when it requests a resource that has a different origin (domain, protocol, or port) from its own. an example of a cross-origin request: the front-end javascript code served from https://domain-a.com uses xmlhttprequest to make a request for https://domain-b.com/data.json. for security reasons, browsers restrict cross-origin http requests initiated from scripts. for example, xmlhttprequest and the fetch api follow the same-origin policy. this means that a web application using those apis can only request resources from the same origin the application was loaded from unless the response from other origins includes the right cors headers. ...
... who should read this article? everyone, really. more specifically, this article is for web administrators, server developers, and front-end developers. ...
...And 49 more matches

Getting Started - Developer guides
this article guides you through the ajax basics and gives you some simple hands-on examples to get you started. what's ajax? ...
...quest object to communicate with servers. it can send and receive information in various formats, including json, xml, html, and text files. ajax’s most appealing characteristic is its "asynchronous" nature, which means it can communicate with the server, exchange data, and update the page without having to refresh the page. the two major features of ajax allow you to do the following: make requests to the server without reloading the page receive and work with data from the server step 1 – how to make an http request in order to make an http request to the server with javascript, you need an instance of an object with the necessary functionality. this is where xmlhttprequest comes in. its predecessor originated in internet explorer as an activex object called xmlhttp. then, mozilla, ...
... with data from the server step 1 – how to make an http request in order to make an http request to the server with javascript, you need an instance of an object with the necessary functionality. this is where xmlhttprequest comes in. its predecessor originated in internet explorer as an activex object called xmlhttp. then, mozilla, safari, and other browsers followed, implementing an xmlhttprequest object that supported the methods and properties of microsoft's original activex object. meanwhile, microsoft implemented xmlhttprequest as well. // old compatibility code, no longer needed. if (window.xmlhttprequest) { // mozilla, safari, ie7+ ... ...
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Using IndexedDB - Web APIs
tion on the indexeddb api, see the indexeddb article and its subpages. this article documents the types of objects used by indexeddb, as well as the methods of the asynchronous api (the synchronous api was removed from spec). basic pattern the basic pattern that indexeddb encourages is the following: open a database. create an object store in the database. start a transaction and make a request to do some database operation, like adding or retrieving data. wait for the operation to complete by listening to the right kind of dom event. do something with the results (which can be found on the request object). with these big concepts under our belts, we can get to more concrete stuff. creating and structuring the store using an experimental version of indexeddb in case you...
...ation. therefore, it is not recommended to use it in production code. it may be preferable to not support a browser than to claim to support it and fail: if (!window.indexeddb) { console.log("your browser doesn't support a stable version of indexeddb. such and such feature will not be available."); } opening a database we start the whole process like this: // let us open our database var request = window.indexeddb.open("mytestdatabase", 3); see that? opening a database is just like any other operation — you have to "request" it. the open request doesn't open the database or start the transaction right away. the call to the open() function returns an idbopendbrequest object with a result (success) or error value that you handle as an event. most other asynchronous functions in indexe...
...the result for the open function is an instance of an idbdatabase. the second parameter to the open method is the version of the database. the version of the database determines the database schema — the object stores in the database and their structure. ...
...And 40 more matches

Index
erface, which you can implement in your code to monitor http transactions in real time, receiving a callback as the transactions take place. 72 observer notifications xpcom, xpcom:add-ons the following are topics that you can observe during the course of an application. unless otherwise noted you register for the topics using the nsiobserverservice. 73 setting http request headers add-ons, extensions, http, xul, xulrunner http is one of the core technologies behind the web. in addition to the actual content, some important information is passed with http headers for both http requests and responses. 74 storage guide, interfaces, storage, toolkit api storage is a sqlite database api. it is available to trusted callers, meaning extensio...
...allowed to directly prompt the user to install add-ons. 181 amiwebinstallprompt interfaces, interfaces:scriptable, xpcom, xpcom interface reference gets a confirmation that the user wants to start the installs. 182 amiwebinstaller extension manager, interfaces, interfaces:scriptable, reference, xpcom interface reference installs an array of add-ons at the request of a webpage. 183 imgicache interfaces, interfaces:scriptable, needscontent, xpcom interface reference evict images from the cache. 184 imgicontainer interfaces, interfaces:scriptable, needscontent, needsupdate, reference, thebes, xpcom interface reference, needsattention implemented by: ?????????????????????????????????????. to create an instance, use: ...
... 191 inidomutils interfaces, interfaces:scriptable, reference, xpcom, xpcom interface reference implemented by: @mozilla.org/inspector/dom-utils;1 as a service: 192 jsdistackfra...
...And 36 more matches

imgIDecoderObserver
it lets you monitor the progress of loading an image. 1.0 66 introduced gecko 12.0 inherits from: imgicontainerobserver last changed in gecko 1.7 we make the distinction here between "load" and "decode" notifications. load notifications are fired as the image is loaded from the network or filesystem. decode notifications are fired as the image is decoded. ...
... or may not be synchronous, depending on the situation. if imgidecoder::flag_sync_decode is passed to a function that triggers a decode, all notifications that can be generated from the currently loaded data fire before the call returns. if flag_sync_decode is not passed, all, some, or none of the notifications may fire before the call returns. ...
...ot be synchronous, depending on the situation. if imgidecoder::flag_sync_decode is passed to a function that triggers a decode, all notifications that can be generated from the currently loaded data fire before the call returns. if flag_sync_decode is not passed, all, some, or none of the notifications may fire before the call returns. ...
...And 36 more matches

Client-Server Overview - Learn web development
prerequisites: basic computer literacy. a basic understanding of what a web server is. ...
... prerequisites: basic computer literacy. a basic understanding of what a web server is. ...
... is however still very relevant, because the described behaviour must be implemented by your server-side code, irrespective of which programming language or web framework you select. web servers and http (a primer) web browsers communicate with web servers using the hypertext transfer protocol (http). when you click a link on a web page, submit a form, or run a search, the browser sends an http request to the server. this request includes: a url identifying the target server and resource (e.g. an html file, a particular data point on the server, or a tool to run). a method that defines the required action (for example, to get a file or to save or update some data). the different methods/verbs and their associated actions are listed below: get: get a specific resource (e.g. an html fi...
...And 35 more matches

Index - MDN Web Docs Glossary: Definitions of Web-related terms
nology web technologies contain long lists of jargon and abbreviations that are used in documentation and coding. this glossary provides definitions of words and abbreviations you need to know to successfully understand and build for the web. 2 404 glossary, http errors, infrastructure, navigation a 404 is a standard response code meaning that the server cannot find the requested resource. 3 502 502, bad gateway, glossary, http errors, infrastructure, navigation an http error code meaning "bad gateway". 4 alpn alpn, draft, glossary, needscontent, tls application-layer protocol negotiation (alpn) is a tls extension which indicates what application layer protocol is negotiating the encryped connection without requiring additional ...
...g expressive web applications, multimedia content, and streaming media. adobe flash can run from supporting web browsers via a browser plug-in. 14 ajax ajax, codingscripting, glossary, infrastructure, l10n:priority ajax, which initially stood for asynchronous javascript and xml, is a programming practice of building complex, dynamic webpages using a technology known as xmlhttprequest. 15 algorithm codingscripting, glossary an algorithm is a self-contained series of instructions to perform a function. 16 alignment container alignment container, css, glossary, alignment the alignment container is the rectangle that the alignment subject is aligned within. this is defined by the layout mode; it is usually the alignment subject’s contai...
...nounced [bezje]) is a mathematically described curve used in computer graphics and animation. in vector images, they are used to model smooth curves that can be scaled indefinitely. 45 cdn glossary, infrastructure a cdn (content delivery network) is a group of servers spread out over many locations. these servers store duplicate copies of data so that servers can fulfill data requests based on which servers are closest to the respective end-users. cdns make for fast service less affected by high traffic. 46 cia glossary, security cia (confidentiality, integrity, availability) (also called the cia triad or aic triad) is a model that guides an organization's policies for information security. 47 cms cms, composing, content management system, ...
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Index
look up raw keys. the preferred approach is to use certificates, and to look up certificates by properties such as the contained subject name (information that describes the owner of the certificate). for example, while nss supports random calculation (creation) of a new public/private key pair, it's difficult to work with such a raw key pair. the usual approach is to create a certificate signing request (csr) as soon as an application is done with the creation step, which will have created a handle to the key pair, and which can be used for the necessary related operations, like producing a proof-of-ownership of the private key, which is usually required when submitting the public key with a csr to a ca. the usual follow up action is receiving a signed certificate from a ca. (however, it's also ...
...nt messaging implementations, a dbm library that implements the classic database storage, and finally a core nss library for the big set of “everything else”. newer generations of the database use the sqlite database to allow concurrent access by multiple applications. all of the above are provided as shared libraries. the crmf library, which is used to produce certain kinds of certificate requests, is available as a library for static linking only. when dealing with certificates (x.509), file formats such as pkcs#12 (certificates and keys), pkcs#7 (signed data), and message formats as cms, we should mention asn.1, which is a syntax for storing structured data in a very efficient (small sized) presentation. it was originally developed for telecommunication systems at times where it was ...
...g with memory, nss makes use of arenas, which are an attempt to simplify management with the limited offerings of c (because there are no destructors). the idea is to group multiple memory allocations in order to simplify cleanup. performing an operation often involves allocating many individual data items, and the code might be required to abort a task at many positions in the logic. an arena is requested once processing of a task starts, and all memory allocations that are logically associated to that task are requested from the associated arena. the implementation of arenas makes sure that all individual memory blocks are tracked. once a task is done, regardless whether it completed or was aborted, the programmer simply needs to release the arena, and all individually allocated blocks will be ...
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HTTP headers - HTTP
http headers let the client and the server pass additional information with an http request or response. an http header consists of its case-insensitive name followed by a colon (:), then by its value. whitespace before the value is ignored. custom proprietary headers have historically been used with an x- prefix, but this convention was deprecated in june 2012 because of the inconveniences it caused when nonstandard fields became standard in rfc 6648; others are listed in an iana registry, whose original content was defined in rfc 4229. iana also maintains a registry of proposed new http headers. ...
... used with an x- prefix, but this convention was deprecated in june 2012 because of the inconveniences it caused when nonstandard fields became standard in rfc 6648; others are listed in an iana registry, whose original content was defined in rfc 4229. iana also maintains a registry of proposed new http headers. headers can be grouped according to their contexts: general headers apply to both requests and responses, but with no relation to the data transmitted in the body. request headers contain more information about the resource to be fetched, or about the client requesting the resource. response headers hold additional information about the response, like its location or about the server providing it. entity headers contain information about the body of the resource, like its content l...
... about the body of the resource, like its content length or mime type. headers can also be grouped according to how proxies handle them: connection keep-alive proxy-authenticate proxy-authorization te trailer transfer-encoding upgrade (see also protocol upgrade mechanism). end-to-end headers these headers must be transmitted to the final recipient of the message: the server for a request, or the client for a response. intermediate proxies must retransmit these headers unmodified and caches must store them. hop-by-hop headers these headers are meaningful only for a single transport-level connection, and must not be retransmitted by proxies or cached. note that only hop-by-hop headers may be set using the connection general header. authentication www-authenticate defines th...
...And 30 more matches

nsIWebProgressListener
uriloader/base/nsiwebprogresslistener.idlscriptable this interface is implemented by clients wishing to listen in on the progress associated with the loading of asynchronous requests in the context of a nsiwebprogress instance as well as any child nsiwebprogress instances. inherits from: nsisupports last changed in gecko 15 (firefox 15 / thunderbird 15 / seamonkey 2.12) nsiwebprogress describes the parent-child relationship of nsiwebprogress instances. ...
...e loading of asynchronous requests in the context of a nsiwebprogress instance as well as any child nsiwebprogress instances. inherits from: nsisupports last changed in gecko 15 (firefox 15 / thunderbird 15 / seamonkey 2.12) nsiwebprogress describes the parent-child relationship of nsiwebprogress instances. ...
... of asynchronous requests in the context of a nsiwebprogress instance as well as any child nsiwebprogress instances. inherits from: nsisupports last changed in gecko 15 (firefox 15 / thunderbird 15 / seamonkey 2.12) nsiwebprogress describes the parent-child relationship of nsiwebprogress instances. ...
...And 29 more matches

Fetching data from the server - Learn web development
s next another very common task in modern websites and applications is retrieving individual data items from the server to update sections of a webpage without having to load an entire new page. ...
... the trouble with this model is that whenever you want to update any part of the page, for example, to display a new set of products or load a new page, you've got to load the entire page again. ...
...computer. the trouble with this model is that whenever you want to update any part of the page, for example, to display a new set of products or load a new page, you've got to load the entire page again. this is extremely wasteful and results in a poor user experience, especially as pages get larger and more complex. ...
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Using Service Workers - Web APIs
rs have suffered with for years is loss of connectivity. the best web app in the world will provide a terrible user experience if you can’t download it. there have been various attempts to create technologies to solve this problem, and some of the issues have been solved. but the overriding problem is that there still isn’t a good overall control mechanism for asset caching and custom network requests. the previous attempt — appcache — seemed to be a good idea because it allowed you to specify assets to cache really easily. however, it made many assumptions about what you were trying to do and then broke horribly when your app didn’t follow those assumptions exactly. read jake archibald's (unfortunately-titled but well-written) application cache is a douchebag for more details. not...
...this using .complete, but it’s still not foolproof, and what about multiple images? and, ummm, it’s still synchronous, so blocks the main thread. instead, we could build our own promise to handle this kind of case. ...
...d our own promise to handle this kind of case. (see our promises test example for the source code, or look at it running live.) note: a real service worker implementation would use caching and onfetch rather than the xmlhttprequest api. those features are not used here so that you can focus on understanding promises. ...
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HTTP response status codes - HTTP
http response status codes indicate whether a specific http request has been successfully completed. responses are grouped in five classes: informational responses (100–199), successful responses (200–299), redirects (300–399), client errors (400–499), and server errors (500–599). the below status codes are defined by section 10 of rfc 2616. you can find an updated specification in rfc 7231. if you receive a response that is not in this list, it is a non-standard response, possibly custom to the server's software. information responses 100 continue this interim response indicates that everything so far is ok and that the client should continue the request, or ignore the response if the request is already finished. 101 switching protocol this code is sent in response...
...ou receive a response that is not in this list, it is a non-standard response, possibly custom to the server's software. information responses 100 continue this interim response indicates that everything so far is ok and that the client should continue the request, or ignore the response if the request is already finished. 101 switching protocol this code is sent in response to an upgrade request header from the client, and indicates the protocol the server is switching to. 102 processing (webdav) this code indicates that the server has received and is processing the request, but no response is available yet. 103 early hints this status code is primarily intended to be used with the link header, letting the user agent start preloading resources while the server prepares a response. ...
...es the protocol the server is switching to. 102 processing (webdav) this code indicates that the server has received and is processing the request, but no response is available yet. 103 early hints this status code is primarily intended to be used with the link header, letting the user agent start preloading resources while the server prepares a response. successful responses 200 ok the request has succeeded. the meaning of the success depends on the http method: get: the resource has been fetched and is transmitted in the message body. head: the entity headers are in the message body. ...
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Web Console remoting - Firefox Developer Tools
e) and it is used by the web console when working with the web console actor. to see how the debugger is used in the web console code, look in browser/devtools/webconsole/webconsole.js, and search for webconsoleconnectionproxy. the new web console actors are: the webconsoleactor allows js evaluation, autocomplete, start/stop listeners, etc. the networkeventactor is used for each new network request. the client can request further network event details - like response body or request headers. to attach to the webconsoleactor, follow these steps: connecttoserver() // the usual listtabs() pickthetabyouwant() debuggerclient.attachconsole(tab.consoleactor, listeners, onattachconsole) the listeners argument is an array which specifies listeners you want to start in the web console. these can...
...s" } { "from": "root", "consoleactor": "conn0.console9", "selected": 2, "tabs": [ { "actor": "conn0.tab2", "consoleactor": "conn0.console7", "title": "", "url": "https://tbpl.mozilla.org/?tree=fx-team" }, // ... ] } notice that the consoleactor is also available as a global actor. when you attach to the global consoleactor you receive all of the network requests, page errors, and the other events from all of the tabs and windows, including chrome errors and network events. this actor is used for the browser console implementation and for debugging remote firefox/b2g instances. startlisteners(listeners, onresponse) the new startlisteners packet: { "to": "conn0.console9", "type": "startlisteners", "listeners": [ "pageerror", "consoleapi",...
...age in the array is of the same type as when we send typical page errors and console api calls. these will be explained in the following sections of this document. ...
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Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
for example, mozilla does not support <layer> as i will discuss later. browsers, like internet explorer 4, that were built before the conception of w3c standards inherited many quirks. in this article, i will describe mozilla's quirks mode, which provides strong backwards html compatibility with internet explorer and other legacy browsers. i'll also cover nonstandard technologies, such as xmlhttprequest and rich text editing, that mozilla does support because no w3c equivalent existed at the time. they include: html 4.01, xhtml 1.0 and xhtml 1.1 cascade style sheets (css): css level 1, css level 2.1 and parts of css level 3 document object model (dom): dom level 1, dom level 2 and parts of dom level 3 mathematical markup language: mathml version 2.0 extensible markup language (xml): xml 1...
...emoves all link information from the selection. --- usecss toggles the usage of css in the generated markup. boolean value for more information, visit rich-text editing in mozilla. xml differences mozilla has strong support for xml and xml-related technologies, such as xslt and web services. it also supports some non-standard internet explorer extensions, such as xmlhttprequest. how to handle xml as with standard html, mozilla supports the w3c xml dom specification, which allows you to manipulate almost any aspect of an xml document. differences between internet explorer's xml dom and mozilla are usually caused by internet explorer's nonstandard behaviors. probably the most common difference is how they handle white space text nodes. often when xml generates, it conta...
...parsefromstring(xmlstring, "text/xml"); } else if (window.activexobject){ // internet explorer, create a new xml document using activex // and use loadxml as a dom parser. mydocument = new activexobject("microsoft.xmldom"); mydocument.async = false; mydocument.loadxml(xmlstring); } else { // not supported. } see using xml data islands in mozilla for an alternative approach. xmlhttprequest internet explorer allows you to send and retrieve xml files using msxml's xmlhttp class, which is instantiated through activex using new activexobject("msxml2.xmlhttp") or new activexobject("microsoft.xmlhttp"). since there is no standard method of doing this, mozilla provides the same functionality in the global javascript xmlhttprequest object. since version 7 ie also supports the "native" xml...
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Enc Dec MAC Using Key Wrap CertReq PKCS10 CSR
2.0. if a copy of the mpl was not distributed with this * file, you can obtain one at http://mozilla.org/mpl/2.0/. ...
...-----" #define pad_header "-----begin pad-----" #define pad_trailer "-----end pad-----" #define lab_header "-----begin key label-----" #define lab_trailer "-----end key label-----" #define pubkey_header "-----begin pub key -----" #define pubkey_trailer "-----end pub key -----" #define ns_certreq_header "-----begin new certificate request-----" #define ns_certreq_trailer "-----end new certificate request-----" #define ns_cert_enc_header "-----begin certificate for encryption-----" #define ns_cert_enc_trailer "-----end certificate for encryption-----" #define ns_cert_vfy_header "-----begin certificate for signature verification-----" #define ns_cert_vfy_trailer "-----end certificate for signature verification-----...
... "-n <nickname> -b <headerfilename> | ", "-b <headerfilename> -i <ipfilename> -e <encryptfilename> | ", "-b <headerfilename> -i <ipfilename> | ", "-b <headerfilename> -i <ipfilename> | ", "-b <headerfilename> -e <encryptfilename> -o <opfilename> \n"); fprintf(stderr, "commands:\n\n"); fprintf(stderr, "%s %s\n --for generating cert request (for ca also)\n\n", progname, "-g -s <subject> -r <csr>"); fprintf(stderr, "%s %s\n --to input and store cert (for ca also)\n\n", progname, "-a -n <nickname> -t <trust> -c <cert> [ -r <csr> -u <issuernickname> [-x <\"\">] -m <serialnumber> ]"); fprintf(stderr, "%s %s\n --to put cert in header\n\n", progname, "-h -n <nickname> -b <headerfilename>...
...And 24 more matches

nsIHttpChannel
netwerk/protocol/http/nsihttpchannel.idlscriptable this interface allows for the modification of http request parameters and the inspection of the resulting http response status and headers when they become available. ...
... http channel, use nsiioservice with a http uri, for example: var ios = components.classes["@mozilla.org/network/io-service;1"] .getservice(components.interfaces.nsiioservice); var ch = ios.newchannel("https://www.example.com/", null, null); method overview void getoriginalresponseheader(in acstring aheader, in nsihttpheadervisitor avisitor); acstring getrequestheader(in acstring aheader); acstring getresponseheader(in acstring header); boolean isnocacheresponse(); boolean isnostoreresponse(); void redirectto(in nsiuri anewuri); void setemptyrequestheader(in acstring aheader); void setreferrerwithpolicy(in nsiuri referrer, in unsigned long referrerpolicy); void setrequestheader(in acstring...
...eader(in acstring aheader); void setreferrerwithpolicy(in nsiuri referrer, in unsigned long referrerpolicy); void setrequestheader(in acstring aheader, in acstring avalue, in boolean amerge); void setresponseheader(in acstring header, in acstring value, in boolean merge); void visitoriginalresponseheaders(in nsihttpheadervisitor avisitor); void visitrequestheaders(in nsihttpheadervisitor avisitor); void visitresponseheaders(in nsihttpheadervisitor avisitor); constants constant description referrer_policy_no_referrer_when_downgrade default; indicates not to pass on the referrer when downgrading from https to http referrer_policy_no_referrer indicates no referrer will be sent referrer_polic...
...And 24 more matches

Index - Archive of obsolete content
n's user interface. 52 passwords add-on sdk interact with firefox's password manager to add, retrieve and remove stored credentials. 53 private-browsing add-on sdk check whether a given object is private, so an add-on can respect private browsing 54 querystring add-on sdk utility functions for working with query strings. 55 request needsupdate, sdk, add-on make simple network requests. 56 selection add-on sdk get and set text and html selections in the current web page. 57 self add-on sdk access data that is bundled with the add-on, and add-on metadata. 58 simple-prefs add-on sdk store preferences across application restarts. 59 simple-stora...
... functional helper methods. 91 lang/type functions for working with type detection. 92 loader/cuddlefish add-on sdk, cfx the sdk's module loader. 93 loader/sandbox create javascript sandboxes and execute scripts in them. 94 net/url no summary! 95 net/xhr provides access to xmlhttprequest functionality. 96 places/bookmarks create, modify, and retrieve bookmarks. 97 places/favicon helper functions for working with favicons. 98 places/history access the user's browsing history. 99 platform/xpcom implement xpcom objects, factories, and services. 100 preferences/event-target add-on s...
...the code snippets on this page will let your site work until these new features are more widely available. 190 isdefaultnamespace no summary! 191 js xpcom code snippets, javascript, xpcom, about:, nsiaboutmodule no summary! 192 javascript debugger service ...
...And 23 more matches

Inner-browsing extending the browser navigation paradigm - Archive of obsolete content
that new page may have links that take you to other pages, which may in turn have more links, and so on. this model of web navigation is so common that most internet users do little else. but as the internet matures, this model has begun to show its age and its limitations. ...
...two implementation examples using the model. the first one looks like a traditional dhtml ticker application and uses hidden iframes and javascript to provide updates inside the webpage's ticker headlines section. this sample was made using iframes to illustrate a possible implementation. an implementation can also use other transport technologies such as soap-based remote procedure calls, xmlhttprequest interfaces, or dom 3 load. the second example shows a tabbed menu that dynamically loads news headlines into the current web page. this implementation uses xmlhttprequest. extending traditional hypertext navigation the hypertext approach to developing web pages, in which developers format text layouts into pages and link those pages to related content, is analogous to a book or a magazine: reader...
...d connecting different resources to different browsers. despite all the evolution, we still see the underpinnings of the original model in modern web sites. we still connect through a set of links that mostly drive us to a new page, and we still occasionally lose track of where we are. also, on the server side, the server often has to rebuild all of the context of the user interface with each new request. of course, this traditional approach is useful and easy to implement, which is why it is still so widely used. but the real showcase for new browser features and web standards like html 4.0 and dom level 2, and xml are models like inner-browsing, where these technologies can begin to be used in the way that they were envisioned. many of the new web technologies in the html 4.0 specification, xml...
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Enc Dec MAC Output Public Key as CSR
2.0. if a copy of the mpl was not distributed with this * file, you can obtain one at http://mozilla.org/mpl/2.0/. ...
... * though pr_errortos...
... * though pr_errortostring was available, support for it in nss wasn't. * fixme: samples s...
...And 23 more matches

Client-side storage - Learn web development
etc. the indexeddb api provides the browser with a complete database system for storing complex data. this can be used for things from complete sets of customer records to even complex data types like audio or video files. you'll learn more about these apis below. the future: cache api some modern browsers support the new cache api. this api is designed for storing http responses to specific requests, and is very useful for doing things like storing website assets offline so the site can subsequently be used without a network connection. cache is usually used in combination with the service worker api, although it doesn't have to be. use of cache and service workers is an advanced topic, and we won't be covering it in great detail in this article, although we will show a simple example in t...
...sequent code inside this window.onload event handler function, called when the window's load event fires, to make sure we don't try to use indexeddb functionality before the app has completely finished loading (it could fail if we don't). inside the window.onload handler, add the following: // open our database; it is created if it doesn't already exist // (see onupgradeneeded below) let request = window.indexeddb.open('notes_db', 1); this line creates a request to open version 1 of a database called notes_db. if this doesn't already exist, it will be created for you by subsequent code. you will see this request pattern used very often throughout indexeddb. database operations take time. you don't want to hang the browser while you wait for the results, so database operations are asyn...
... note: the version number is important. ...
...And 22 more matches

BasicCardResponse - Web APIs
properties basiccardresponse.cardnumber read only secure context contains the number of the card used to make the payment. basiccardresponse.cardholdername read only secure context optional contains the cardholder name of the card used to make the payment. basiccardresponse.cardsecuritycode read only secure context optional contains the security code of the card used to make the payment. ...
...re context optional contains the expiry month of the card used to make the payment. basiccardresponse.expiryyear read only secure context optional contains the expiry year of the card used to make the payment. basiccardresponse.billingaddress read only secure context optional contains the billing address of the card used to make the payment. examples in the following example, the paymentrequest() constructor is used to create a new payment request, which takes three objects as parameters — one containing details of the payment methods that can be used for the payment, one containing details of the actual order (such as items bought and shipping options), and an optional object containing further options. the first of these three (supportedinstruments in the example below) contains a ...
...bjects as parameters — one containing details of the payment methods that can be used for the payment, one containing details of the actual order (such as items bought and shipping options), and an optional object containing further options. the first of these three (supportedinstruments in the example below) contains a data property that has to conform to the structure defined by the basiccardrequest dictionary. var supportedinstruments = [{ supportedmethods: 'basic-card', data: { supportednetworks: ['visa', 'mastercard', 'amex', 'jcb', 'diners', 'discover', 'mir', 'unionpay'], supportedtypes: ['credit', 'debit'] } }]; var details = { total: {label: 'donation', amount: {currency: 'usd', value: '65.00'}}, displayitems: [ { label: 'original ...
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sample2
e mac_header "-----begin mac-----" #define mac_trailer "-----end mac-----" #define pad_header "-----begin pad-----" #define pad_trailer "-----end pad-----" #define lab_header "-----begin key label-----" #define lab_trailer "-----end key label-----" #define pubkey_header "-----begin pub key -----" #define pubkey_trailer "-----end pub key -----" #define ns_certreq_header "-----begin new certificate request-----" #define ns_certreq_trailer "-----end new certificate request-----" #define ns_cert_enc_header "-----begin certificate for encryption-----" #define ns_cert_enc_trailer "-----end certificate for encryption-----" #define ns_cert_vfy_header "-----begin certificate for signature verification-----" #define ns_cert_vfy_trailer "-----end certificate for signature verification-----" #define ns_sig_h...
...[ -r <csr> -u <issuernickname> [-x <\"\">] -m <serialnumber> ] | ", "-n <nickname> -b <headerfilename> | ", "-b <headerfilename> -i <ipfilename> -e <encryptfilename> | ", "-b <headerfilename> -i <ipfilename> | ", "-b <headerfilename> -i <ipfilename> | ", "-b <headerfilename> -e <encryptfilename> -o <opfilename> \n"); fprintf(stderr, "commands:\n\n"); fprintf(stderr, "%s %s\n --for generating cert request (for ca also)\n\n", progname, "-g -s <subject> -r <csr>"); fprintf(stderr, "%s %s\n --to input and store cert (for ca also)\n\n", progname, "-a -n <nickname> -t <trust> -c <cert> [ -r <csr> -u <issuernickname> [-x <\"\">] -m <serialnumber> ]"); fprintf(stderr, "%s %s\n --to put cert in header\n\n", progname, "-h -n <nickname> -b <headerfilename> [-v <\"\">]"); fprintf(stderr, "%s %s\n --to find p...
...r, "%-30s - output file name\n\n", "-o <opfilename>"); fprintf(stderr, "%-30s - certificate serial number\n\n", "-m <serialnumber>"); fprintf(stderr, "%-30s - certificate nickname\n\n", "-n <nickname>"); fprintf(stderr, "%-30s - certificate trust\n\n", "-t <trustargs>"); fprintf(stderr, "%-30s - certificate issuer nickname\n\n", "-u <issuernickname>"); fprintf(stderr, "%-30s - certificate signing request \n\n", "-r <csr>"); fprintf(stderr, "%-30s - generate a self-signed cert [optional]\n\n", "-x"); fprintf(stderr, "%-30s - to enable ascii [optional]\n\n", "-a"); fprintf(stderr, "%-30s - to save certificate to header file as sig verification [optional]\n\n", "-v"); exit(-1); } /* * validate the options used for generate csr command */ static void validategeneratecsrcommand(const char *progname, c...
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Cooperative asynchronous JavaScript: Timeouts and intervals - Learn web development
ctions that allow them to asynchronously execute code after a certain time interval has elapsed, and to repeatedly execute a block of code asynchronously until you tell it to stop. these functions are: settimeout() execute a specified block of code once after a specified time has elapsed. setinterval() execute a specified block of code repeatedly with a fixed time delay between each call. requestanimationframe() the modern version of setinterval(). executes a specified block of code before the browser next repaints the display, allowing an animation to be run at a suitable framerate regardless of the environment it is being run in. the asynchronous code set up by these functions runs on the main thread (after their specified timer has elapsed). it's important to know that you can (an...
...ing with cleartimeout() or clearinterval() cleartimeout() and clearinterval() both use the same list of entries to clear from. interestingly enough, this means that you can use either method to clear a settimeout() or setinterval(). for consistency, you should use cleartimeout() to clear settimeout() entries and clearinterval() to clear setinterval() entries. this will help to avoid confusion. requestanimationframe() requestanimationframe() is a specialized looping function created for running animations efficiently in the browser. it is basically the modern version of setinterval() — it executes a specified block of code before the browser next repaints the display, allowing an animation to be run at a suitable frame rate regardless of the environment it is being run in. it was created in...
...te regardless of the environment it is being run in. it was created in response to perceived problems with setinterval(), which for example doesn't run at a frame rate optimized for the device, sometimes drops frames, continues to run even if the tab is not the active tab or the animation is scrolled off the page, etc. ...
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Using Fetch - Web APIs
fetch provides a better alternative that can be easily used by other technologies such as service workers. fetch also provides a single logical place to define other http-related concepts such as cors and extensions to http. ...
...fetch provides a better alternative that can be easily used by other technologies such as service workers. fetch also provides a single logical place to define other http-related concepts such as cors and extensions to http. ...
...o define other http-related concepts such as cors and extensions to http. the fetch specification differs from jquery.ajax() in three main ways: the promise returned from fetch() won’t reject on http error status even if the response is an http 404 or 500. ...
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PaymentResponse.retry() - Web APIs
the paymentresponse interface's retry() method makes it possible to ask the user to retry a payment after an error occurs during processing. this lets your app gracefully deal with situations such as invalid shipping addresses or declined credit cards. syntax retrypromise = paymentrequest.retry(errorfields); parameters errorfields a paymentvalidationerrors object, with the following properties: error optional a general description of a payment error from which the user may attempt to recover by retrying the payment, possibly after correcting mistakes in the payment information. error can be provided all by itself to provide only a generic error message, or in concert with the other properties to serve as an overview while other properties' values gude the user to errors in speci...
... in the shipping address that failed validation. return value a promise which is resolved when the payment is successfully completed. the promise is rejected with an appropriate exception value if the payment fails again. typically you will use this by calling show(), then entering a loop or recursive function that checks the paymentresponse for errors or other reasons to retry the payment request. ...
...appropriate exception value if the payment fails again. typically you will use this by calling show(), then entering a loop or recursive function that checks the paymentresponse for errors or other reasons to retry the payment request. if a retry is needed, the loop calls retry(), then loops back to check the response when it comes in. the loop exits only when the user either cancels the payment request or the request is successful. see the example below for a thorough example, but the basic concept, in outline form, is: create a new paymentrequest (new paymentrequest()) display the payment request (paymentrequest.show() if show() resolves, the returned paymentresponse describes the requested payment and the options chosen by the user. continue by... validate the returned reponse; if...
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Connecting to Remote Content - Archive of obsolete content
« previousnext » using xmlhttprequest xmlhttprequest is an api for transferring xml between a local script and a remote server via http. it is an integral part of the modern web, and all major browsers support it. besides xml, it can be used to retrieve data in other formats, for example json, html and plain text. in this section we'll look into the xml and json communication mechanisms. ...
...est xmlhttprequest is an api for transferring xml between a local script and a remote server via http. it is an integral part of the modern web, and all major browsers support it. besides xml, it can be used to retrieve data in other formats, for example json, html and plain text. in this section we'll look into the xml and json communication mechanisms. ...
... local script and a remote server via http. it is an integral part of the modern web, and all major browsers support it. besides xml, it can be used to retrieve data in other formats, for example json, html and plain text. in this section we'll look into the xml and json communication mechanisms. ...
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Tabbed browser - Archive of obsolete content
window because it is run in a sidebar or dialog, you first need to get access to the browser window you need before you can use gbrowser. you can find more information on getting access to the browser window in working with windows in chrome code. ...
...your extension code is a sidebar you can use: var mainwindow = window.queryinterface(components.interfaces.nsiinterfacerequestor) .getinterface(components.interfaces.nsiwebnavigation) .queryinterface(components.interfaces.nsidocshelltreeitem) .roottreeitem .queryinterface(components.interfaces.nsiinterfacerequestor) .getinterface(components.interfaces.nsidomwindow); mainwindow.gbrowser.addtab(...); from a dialog if your code is running in a dialog opened directly by a browser window, you can use: window.opener.gbrowser.addtab(...); if window.opener doesn't work, you can get the most recent browser window using this code: var wm = components.classes["@mozilla.org/appshell/win...
... dump(b.currenturi.spec); // dump urls of all open tabs to console } catch(e) { components.utils.reporterror(e); } } to learn what methods are available for <browser/> and <tabbrowser/> elements, use dom inspector or look in browser.xml for corresponding xbl bindings (or just look at the current reference pages on browser and tabbrowser. getting the browser that fires the http-on-modify-request notification see the observer notifications page for information on http-on-* notifications. note that some http requests aren't associated with a tab; for example, rss feed updates, extension manager requests, xhr requests from xpcom components, etc. in those cases, the following code returns null. warning: this code should be updated to use nsiloadcontext instead of getinterface(components.i...
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Sending forms through JavaScript - Learn web development
this article explores such approaches. a form is not always a form with progressive web apps, single page apps, and framework based apps, it's common to use html forms to send data without loading a new document when response data is received. let's first talk about why this requires a different approach. gaining control of the global interface standard html form submission, as described in the previous article, loads the url where the data was sent, which means the browser window navigates with a full page load. ...
... forms to collect input from the user, and not for data submission. when the user tries to send the data, the application takes control and transmits the data asynchronously in the background, updating only the parts of the ui that require changes. sending arbitrary data asynchronously is generally called ajax, which stands for "asynchronous javascript and xml". how is it different? the xmlhttprequest (xhr) dom object can build http requests, send them, and retrieve their results. historically, xmlhttprequest was designed to fetch and send xml as an exchange format, which has since been superceded by json. but neither xml nor json fit into form data request encoding. form data (application/x-www-form-urlencoded) is made of url-encoded lists of key/value pairs. for transmitting binary data, the...
... note: the fetch api is often used in place of xhr these days — it is a modern, updated version of xhr, which works in a similar fashion but has some advantages. most of the xhr code you'll see in this article could be swapped out for fetch. ...
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Background Tasks API - Web APIs
concepts and usage the main thread of a web browser is centered around its event loop. this code draws any pending updates to the document currently being displayed, runs any javascript code the page needs to run, accepts events from input devices, and dispatches those events to the elements that should receive them. ...
...e event handling and screen updates are two of the most obvious ways users notice performance issues, it's important for your code to be a good citizen of the web and help to prevent stalls in the execution of the event loop. in the past, there's been no way to do this reliably other than by writing code that's as efficient as possible and by offloading as much work as possible to workers. window.requestidlecallback() makes it possible to become actively engaged in helping to ensure that the browser's event loop runs smoothly, by allowing the browser to tell your code how much time it can safely use without causing the system to lag. if you stay within the limit given, you can make the user's experience much better. getting the most out of idle callbacks because idle callbacks are intended to g...
... the dom within your idle callback. by the time your callback is run, the current frame has already finished drawing, and all layout updates and computations have been completed. if you make changes that affect layout, you may force a situation in which the browser has to stop and do recalculations that would otherwise be unnecessary. if your callback needs to change the dom, it should use window.requestanimationframe() to schedule that. avoid tasks whose run time can't be predicted. your idle callback should avoid doing anything that could take an unpredictable amount of time. for example, anything which might affect layout should be avoided. you should also avoid resolving or rejecting promises, since that would invoke the handler for that promise's resolution or rejection as soon as your call...
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Streams - Plugins
associated with one specific instance of a plug-in, a plug-in can have more than one stream object per instance. streams can be produced by the browser and consumed by a plug-in instance, or produced by an instance and consumed by the browser. each stream has an associated mime type identifying the format of the data in the stream. streams produced by the browser can be automatically sent to or requested by the plug-in instance. the browser calls the plug-in methods npp_newstream, npp_writeready, npp_write, and npp_destroystream to, respectively, create a stream, find out how much data the plug-in can handle, push data into the stream, and delete it. the plug-in instance selects a transmission mode for streams produced by the browser. stream data can be pushed by the browser, pulled by the plu...
...stream, and delete it. the plug-in instance selects a transmission mode for streams produced by the browser. stream data can be pushed by the browser, pulled by the plug-in, or saved to a local file and passed to the plug-in. normal mode: the browser uses the npp_write method to "push" stream data to the instance incrementally as it is available. random-access mode: the plug-in calls the npn_requestread method to "pull" stream data. in general, this mode is more expensive, because the entire stream must be downloaded to a temporary file before use unless the stream comes from a local file or an http server that supports the byte-range extension to http. file mode: the browser saves the entire stream to a local file and passes the file path to the plug-in instance through the npp_streamasfil...
...refers to the plug-in instance receiving the stream; the type parameter represents the stream's mime type. the stream parameter is a pointer to the new stream, which is valid until the stream is destroyed. the seekable parameter specifies whether the stream is seekable (true) or not (false). seekable streams support random access (for example, local files or http servers that support byte-range requests). the plug-in can set the output parameter type to one of these transmission modes: np_normal: (default): the plug-in can process the data progressively as it arrives from the network or file system through a series of calls to npp_writeready and npp_write. np_asfileonly: this plug-in gets full random access to the data using platform-specific file operations. the browser saves stream data ...
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LocalFileSystem - Web APIs
the argument of a successful callback is the filesystem object, which has two properties: the name and root of the file system. ...
...the argument of a successful callback is the filesystem object, which has two properties: the name and root of the file system. ...
...useful to create a second one. for example, if you were to create a mail app, you might create a temporary storage for caching assets (like images and attachments) to speed up performance, while creating persistent storage for unique data—such as drafts of emails that were composed while offline—that should not be lost before they are backed up into the cloud. using persistent storage the requestfilesystem() method lets you ask for persistent or temporary storage. persistent storage is storage that stays in the browser unless the app or the user removes it, but the user must grant you permission before you can use it. in contrast, temporary storage is automatically granted without any user permission, but it can be expunged by the browser at any time. to use persistent storage with the f...
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How to convert an overlay extension to restartless - Archive of obsolete content
ccess for files internal to your bundle for an extractionless extension, access to files internal to your bundle will not be possible using the nsifile interface. if you need to read data, or otherwise access files within your bundle, there are two options. the first is to use the nsizipreader interface which permits continuing to use nsiinputstreams, etc. the second is to re-code to use xmlhttprequest. a file:// uri to the install location, or .xpi file, is available in installpath property of the bootstrap data structure passed to the startup(), shutdown(), install(), and uninstall() functions in what will be your bootstrap.js file (see below). how to get and load the data of of your add-on's files using the add-on manager api: // this is the old way of getting one of your files const myad...
...illa.org/libjar/zip-reader;1"] .createinstance(components.interfaces.nsizipreader); zipreader.open(addondata.installpath); ... from there you can open nsiinputstreams, extract files, or perform some other functions. worst case would be that you extract a file to a temporary location and then use nsifile operations upon the extracted file. step 3b: option 2: use xmlhttprequest now, how do we replace that? the answer to that question is to load your file from a chrome:// uri using xmlhttprequest. you may now have another question: wait, what does this have to do with xml or http? the answer to that question is, of course, nothing. xmlhttprequest is an api created by microsoft, adopted by mozilla and other vendors, and hacked into a swiss army knife of file loading. you...
...fe of file loading. you can use it in a web page to fetch a file from your server and you can use it in your add-on to fetch a local file from your installation. the name is a vestigial structure that just makes things confusing. it is nonetheless the "correct" and best way to do things. ...
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nsIContentPolicy - Archive of obsolete content
ntations of shouldload() or shouldprocess() (for example, by launching a dialog to prompt the user for something).") note: in reality, much of this interface is defined in the nsicontentpolicybase interface, but for now is documented here until someone has time to split things up. ...
...hing).") note: in reality, much of this interface is defined in the nsicontentpolicybase interface, but for now is documented here until someone has time to split things up. ...
...documented here until someone has time to split things up. method overview short shouldload(in unsigned long acontenttype, in nsiuri acontentlocation, in nsiuri arequestorigin, in nsisupports acontext, in acstring amimetypeguess, in nsisupports aextra, in nsiprincipal arequestprincipal); short shouldprocess(in unsigned long acontenttype, in nsiuri acontentlocation, in nsiuri arequestorigin, in nsisupports acontext, in acstring amimetype, in nsisupports aextra, in nsiprincipal arequestprincipal); constants content types constant value description type_other 1 indicates content whose type is unknown, or is not interesting outside a limited use case. in general, you should try not to use this type unless none of the others is a fit. ...
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Anatomy of a video game - Game development
on a strict interval of time, every frame, or only after something else happens. being more specific with the browser about when your function needs to be called allows the browser to optimize when it is called. also, it will probably make your job easier. ...
...ction to anything other than the browser's redraw schedule? ...
...allback function must be passed in to it when it is called. that callback function will be executed at a suitable time before the next repaint. here is an example of a simple main loop: window.main = function () { window.requestanimationframe( main ); // whatever your main loop needs to do }; main(); // start the cycle note: in each of the main() methods discussed here, we schedule a new requestanimationframe before performing our loop contents. that is not by accident and it is considered best practice. calling the next requestanimationframe early ensures the browser receives it on time to plan accordingly even if your current frame misses its vsync window. the above chunk of code has two statements. the first statement creates a function as a global variable called main(). this funct...
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Sending form data - Learn web development
ming. objective: to understand what happens when form data is submitted, including getting a basic idea of how data is processed on the server first we'll discuss what happens to the data when a form is submitted. client/server architecture at it's most basic, the web uses a client/server architecture that can be summarized as follows. a client (usually a web browser) sends a request to a server (most of the time a web server like apache, nginx, iis, tomcat, etc.), using the http protocol. the server answers the request using the same protocol. an html form on a web page is nothing more than a convenient user-friendly way to configure an http request to send data to a server. this enables the user to provide information to be delivered in the http request. note: to get a...
...the two most important attributes are action and method. the action attribute the action attribute defines where the data gets sent. its value must be a valid relative or absolute url. ...
...m"> here, we use a relative url — the data is sent to a different url on the same origin: <form action="/somewhere_else"> when specified with no attributes, as below, the <form> data is sent to the same page that the form is present on: <form> note: it's possible to specify a url that uses the https (secure http) protocol. when you do this, the data is encrypted along with the rest of the request, even if the form itself is hosted on an insecure page accessed using http. on the other hand, if the form is hosted on a secure page but you specify an insecure http url with the action attribute, all browsers display a security warning to the user each time they try to send data because the data will not be encrypted. the names and values of the non-file form controls are sent to the server a...
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NSS tools : certutil
ting certificate to a certificate database. the certificate database should already exist; if one is not present, this command option will initialize one by default. -b run a series of commands from the specified batch file. this requires the -i argument. -c create a new binary certificate file from a binary certificate request file. use the -i argument to specify the certificate request file. if this argument is not used, certutil prompts for a filename. -d delete a certificate from the certificate database. --rename change the database nickname of a certificate. -e add an email certificate to the certificate database. -f delete a pri...
...tabase. use the -h tokenname argument to specify the certificate database on a particular hardware or software token. -m modify a certificate's trust attributes using the values of the -t argument. -n create new certificate and key databases. -o print the certificate chain. -r create a certificate request file that can be submitted to a certificate authority (ca) for processing into a finished certificate. output defaults to standard out unless you use -o output-file argument. use the -a argument to specify ascii output. -s create an individual certificate and add it to a certificate database. -t reset the key...
...o migrate legacy nss databases (cert8.db and key3.db) into the newer sqlite databases (cert9.db and key4.db). arguments arguments modify a command option and are usually lower case, numbers, or symbols. -a use ascii format or allow the use of ascii format for input or output. this formatting follows rfc 1113. for certificate requests, ascii output defaults to standard output unless redirected. -b validity-time specify a time at which a certificate is required to be valid. use when checking certificate validity with the -v option. the format of the validity-time argument is yymmddhhmmss[+hhmm|-hhmm|z], which allows offsets to be set relative to the validi...
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sslerr.html
types handled by the certificate library. ssl_error_unsupported_version -12279 "peer using unsupported version of security protocol." on a client socket, this means the remote server has attempted to negotiate the use of a version of ssl that is not supported by the nss library, probably an invalid version number. ...
...er socket, this means the remote client has requested the use of a version of ssl older than version 2. -12278 (unused) ssl_error_wrong_certificate -12277 "client authentication failed: private key in key database does not correspond to public key in certificate database." ssl_error_bad_cert_domain -12276 "unable to communicate securely with peer: requested domain name does not match the server's certificate." this error code should be returned by the certificate authentication callback function when it detects that the common name in the remote server's certificate does not match the hostname sought by the local client, according to the matching rules specified for cert_verifycertname. ssl_error_post_warning -12275 ...
... socket is inappropriate for the key exchange algorithm selected. ssl_error_fortezza_pqg -12267 "cannot connect: ssl peer is in another fortezza domain." the local system and the remote system are in different fortezza domains. they must be in the same domain to communicate. ssl_error_unknown_cipher_suite -12266 "an unknown ssl cipher suite has been requested." the application has attempted to configure ssl to use an unknown cipher suite. ssl_error_no_ciphers_supported -12265 "no cipher suites are present and enabled in this program." possible causes: (a) all cipher suites have been configured to be disabled, (b) the only cipher suites that are configured to be enabled are those that are disallowed by cipher e...
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certutil
dd an existing certificate to a certificate database. the certificate database should already exist; if one is not present, this option will initialize one by default. -b run a series of commands from the specified batch file. this requires the -i argument. -c create a new binary certificate file from a binary certificate request file. use the -i argument to specify the certificate request file. if this argument is not used, certutil prompts for a filename. -d delete a certificate from the certificate database. -e add an email certificate to the certificate database. -f delete a private key from a key database. specify the key to delete with ...
...e database. use the -h tokenname argument to specify the certificate database on a particular hardware or software token. -m modify a certificate's trust attributes using the values of the -t argument. -n create new certificate and key databases. -o print the certificate chain. -r create a certificate request file that can be submitted to a certificate authority (ca) for processing into a finished certificate. output defaults to standard out unless you use -o output-file argument. use the -a argument to specify ascii output. -s create an individual certificate and add it to a certificate database. -t reset the key database or ...
...into a new database. this is used to migrate legacy nss databases (cert8.db and key3.db) into the newer sqlite databases (cert9.db and key4.db). arguments option arguments modify an action and are lowercase. -a use ascii format or allow the use of ascii format for input or output. this formatting follows rfc 1113. for certificate requests, ascii output defaults to standard output unless redirected. -b validity-time specify a time at which a certificate is required to be valid. use when checking certificate validity with the -v option. the format of the validity-time argument is yymmddhhmmss[+hhmm|-hhmm|z], which allows offsets to be set relative to the validity end time.
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nsIHttpServer
rectorypath) { var file = components.classes['@mozilla.org/file/local;1'] .createinstance(components.interfaces.nsilocalfile); file.initwithpath(directorypath); return server.registerdirectory(path, file); }, registerpathhandler: function(path, handlercallback) { server.registerpathhandler(path, function (request, response) { var req = createhttprequest(request); var resp = new httpresponse(response); handlercallback(req, resp); }); }, registerprefixhandler: function(prefix, handlercallback) { server.registerprefixhandler(prefix, function (request, response) { var req = createhttpreques...
...response) { var req = createhttprequest(request); var resp = new httpresponse(response); handlercallback(req, resp); }); }, registerprefixhandler: function(prefix, handlercallback) { server.registerprefixhandler(prefix, function (request, response) { var req = createhttprequest(request); var resp = new httpresponse(response); handlercallback(req, resp); }); }, close: function(){ server.stop(function(){}); }, get port() { return server.identity.primaryport } } } reference : mozilla-release/netwerk/test/httpserver/nsihttpserver.idl [scriptabl...
...but before the provided callback function has been * called. */ void start(in long port); /** * shuts down this server if it is running (including the period of time after * stop() has been called but before the provided callback has been called). * * @param callback * an asynchronous callback used to notify the user when this server is * stopped and all pending requests have been fully served * @throws ns_error_null_pointer * if callback is null * @throws ns_error_unexpected * if this server is not running */ void stop(in nsihttpserverstoppedcallback callback); /** * associates the local file represented by the string file with all requests * which match request. * * @param path * the path which is to be mapped to the gi...
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Fullscreen API - Web APIs
nterfaces of its own. instead, it augments several other interfaces to add the methods, properties, and event handlers needed to provide full-screen functionality. these are listed in the following sections. methods the fullscreen api adds methods to the document and element interfaces to allow turning off and on full-screen mode. ...
...s the fullscreen api adds methods to the document and element interfaces to allow turning off and on full-screen mode. methods on the document interface document.exitfullscreen() requests that the user agent switch from full-screen mode back to windowed mode. returns a promise which is resolved once full-screen mode has been completely shut off. methods on the element interface element.requestfullscreen() asks the user agent to place the specified element (and, by extension, its descendants) into full-screen mode, removing all of the browser's ui elements as well as all other applications from the screen. returns a promise which is resolved once full-screen mode has been activated. properties the document interface provides properties that can be used to determine if full-screen mo...
...r during the process of changing between full-screen and windowed modes. fullscreenchange sent to a document or element when it transitions into or out of full-screen mode. fullscreenerror sent to a document or element if an error occurs while attempting to switch it into or out of full-screen mode. dictionaries fullscreenoptions provides optional settings you can specify when calling requestfullscreen(). controlling access the availability of full-screen mode can be controlled using feature policy. the full-screen mode feature is identified by the string "fullscreen", with a default allow-list value of "self", meaning that full-screen mode is permitted in top-level document contexts, as well as to nested browsing contexts loaded from the same origin as the top-most document. see ...
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Movement, orientation, and motion: A WebXR example - Web APIs
see output from immersive mode even if you don't have a headset. setup and utility functions next, we declare the variables and constants used throughout the application, starting with those used to store webgl and webxr specific information: let polyfill = null; let xrsession = null; let xrinputsources = null; let xrreferencespace = null; let xrbutton = null; let gl = null; let animationframerequestid = 0; let shaderprogram = null; let programinfo = null; let buffers = null; let texture = null; let mouseyaw = 0; let mousepitch = 0; this is followed by a set of constants, mostly to contain various vectors and matrices used while rendering the scene. const viewerstartposition = vec3.fromvalues(0, 0, -10); const viewerstartorientation = vec3.fromvalues(0, 0, 1.0); const cubeorientation = ve...
...adjusted in the code that handles actuallys ttarting and stopping the webxr session; we'll see that below. the webxr session is toggled on and off by the handler for click events on the button, whose label is appropriately set to either "enter webxr" or "exit webxr". this is done by the onxrbuttonclick() event handler. ...
...if it is, we call sessionstarted() to begin running the scene in the webxr session. if we already have an ongoing session, on the other hand, we call its end() method to stop the session. ...
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WindowOrWorkerGlobalScope.fetch() - Web APIs
the promise does not reject on http errors — it only rejects on network errors. you must use then handlers to check for http errors. ...
...ermissions issue or similar). a fetch() promise does not reject on http errors (404, etc.). instead, a then() handler must check the response.ok and/or response.status properties. the fetch() method is controlled by the connect-src directive of content security policy rather than the directive of the resources it's retrieving. note: the fetch() method's parameters are identical to those of the request() constructor. syntax const fetchresponsepromise = fetch(resource [, init]) parameters resource this defines the resource that you wish to fetch. this can either be: a usvstring containing the direct url of the resource you want to fetch. some browsers accept the blob: and data: schemes. a request object. init optional an object containing any custom settings that you want ...
... syntax const fetchresponsepromise = fetch(resource [, init]) parameters resource this defines the resource that you wish to fetch. this can either be: a usvstring containing the direct url of the resource you want to fetch. some browsers accept the blob: and data: schemes. a request object. init optional an object containing any custom settings that you want to apply to the request. the possible options are: method the request method, e.g., get, post. note that the origin header is not set on fetch requests with a method of head or get. (this behavior was corrected in firefox 65 — see bug 1508661). headers any headers you want to add to your request, contained within a headers object or an object literal with bytestring values. note that some names are forbid...
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An overview of HTTP - HTTP
http is a protocol which allows the fetching of resources, such as html documents. it is the foundation of any data exchange on the web and it is a client-server protocol, which means requests are initiated by the recipient, usually the web browser. a complete document is reconstructed from the different sub-documents fetched, for instance text, layout description, images, videos, scripts, and more. clients and servers communicate by exchanging individual messages (as opposed to a stream of data). the messages sent by the client, usually a web browser, are called requests and the messages sent by the server as an answer are called responses. designed in the early 1990s, http is an extensible protocol which has evolved over time. it is an application layer protocol that is sent over tcp, or o...
...ed tcp connection, though any reliable transport protocol could theoretically be used. due to its extensibility, it is used to not only fetch hypertext documents, but also images and videos or to post content to servers, like with html form results. http can also be used to fetch parts of documents to update web pages on demand. components of http-based systems http is a client-server protocol: requests are sent by one entity, the user-agent (or a proxy on behalf of it). most of the time the user-agent is a web browser, but it can be anything, for example a robot that crawls the web to populate and maintain a search engine index. each individual request is sent to a server, which handles it and provides an answer, called the response. between the client and the server there are numerous entiti...
...thanks to the layered design of the web, these are hidden in the network and transport layers. http is on top, at the application layer. although important to diagnose network problems, the underlying layers are mostly irrelevant to the description of http. ...
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nsITraceableChannel
after that your nsistreamlistener implementation will get the response data and will be able to pass the data on to the original nsistreamlistener (possibly modifying it). see nsitraceablechannel, intercept http traffic for a more detailed descripti...
... for the "http-on-examine-response" notification to track all http responses; skip redirects (responsestatus = 3xx on nsihttpchannel), since otherwise you may end up with two listeners registered for a channel; qi the channel passed as the "subject" to your observer to nsitraceablechannel, and replace the default nsistreamlistener (that passes the data to the original requester - e.g. to xmlhttprequest or to the browser tab that made the request) with your own implementation (see "implementing nsistreamlistener" below). after that your nsistreamlistener implementation will get the response data and will be able to pass the data on to the original nsistreamlistener (possibly modifying it). see nsitraceablechannel, intercept http traffic for a more detailed description with code samples. see ...
...e "implementing nsistreamlistener" below). after that your nsistreamlistener implementation will get the response data and will be able to pass the data on to the original nsistreamlistener (possibly modifying it). see nsitraceablechannel, intercept http traffic for a more detailed description with code samples. see modify url before loading page in firefox for an overview of how to modify a request before it is made. method overview nsistreamlistener setnewlistener(in nsistreamlistener alistener); methods setnewlistener() replaces the channel's current listener with a new one, returning the listener previously assigned to the channel. nsistreamlistener setnewlistener( in nsistreamlistener alistener ); parameters alistener an nsistreamlistener to be notified of e...
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Using the Notifications API - Web APIs
if the user is doing something else with another application. many examples of this now exist, such as slack. we've written a real world example — a to-do list app — to give more of an idea of how web notifications can be used. it stores data locally using indexeddb and notifies users when tasks are due using system notifications. download the to-do list code, or view the app running live. requesting permission before an app can send a notification, the user must grant the application the right to do so. this is a common requirement when an api tries to interact with something outside a web page — at least once, the user needs to specifically grant that application permission to present notifications, thereby letting the user control which apps/sites are allowed to display notifications...
...act with something outside a web page — at least once, the user needs to specifically grant that application permission to present notifications, thereby letting the user control which apps/sites are allowed to display notifications. because of abuses of push notifications in the past, web browsers and developers have begun to implement strategies to help mitigate this problem. you should only request consent to display notifications in response to a user gesture (e.g. clicking a button). this is not only best practice — you should not be spamming users with notifications they didn't agree to — but going forward browsers will explicitly disallow notification permission requests not triggered in response to a user gesture. firefox is already doing this from version 72, for example, and safa...
...g a button). this is not only best practice — you should not be spamming users with notifications they didn't agree to — but going forward browsers will explicitly disallow notification permission requests not triggered in response to a user gesture. firefox is already doing this from version 72, for example, and safari has done it for some time. in addition, in chrome and firefox you cannot request notifications at all unless the site is a secure context (i.e. https), and you can no longer allow notification permissions to be requested from cross-origin <iframe>s. checking current permission status you can check to see if you already have permission by checking the value of the notification.permission read only property. it can have one of three possible values: default the user hasn'...
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Access-Control-Allow-Headers - HTTP
the access-control-allow-headers response header is used in response to a preflight request which includes the access-control-request-headers to indicate which http headers can be used during the actual request. this header is required if the request has an access-control-request-headers header. header type response header forbidden header name no syntax access-control-allow-headers: <header-name>[, <header-name>]* access-control-allow-headers: * directives <header-name> the name of a supported request header. the header may list any number of headers, separated by commas. ...
...der. header type response header forbidden header name no syntax access-control-allow-headers: <header-name>[, <header-name>]* access-control-allow-headers: * directives <header-name> the name of a supported request header. the header may list any number of headers, separated by commas. * (wildcard) the value "*" only counts as a special wildcard value for requests without credentials (requests without http cookies or http authentication information). in requests with credentials, it is treated as the literal header name "*" without special semantics. note that the authorization header can't be wildcarded and always needs to be listed explicitly. examples a custom header here's an example of what an access-control-allow-headers header might look like. ...
...or http authentication information). in requests with credentials, it is treated as the literal header name "*" without special semantics. note that the authorization header can't be wildcarded and always needs to be listed explicitly. examples a custom header here's an example of what an access-control-allow-headers header might look like. it indicates that in addition to the cors-safelisted request headers, a custom header named x-custom-header is supported by cors requests to the server. access-control-allow-headers: x-custom-header multiple headers this example shows access-control-allow-headers when it specifies support for multiple headers. ...
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Interaction between privileged and non-privileged pages - Archive of obsolete content
of conflicts with other new events.") in the case where your extension's overlay does not interact directly with browser.xul, such as in a sidebar, it might be easier to add the event listener to the top-level document directly as shown below (also see: accessing the elements of the top-level document from a child window). ...
...sing the elements of the top-level document from a child window). var mainwindow = window.queryinterface(components.interfaces.nsiinterfacerequestor) .getinterface(components.interfaces.nsiwebnavigation) .queryinterface(components.interfaces.nsidocshelltreeitem) .roottreeitem .queryinterface(components.interfaces.nsiinterfacerequestor) .getinterface(components.interfaces.nsidomwindow); mainwindow.document.addeventlistener("myextensionevent", function(e) { myextension.mylistener(e); }, false, true); if you need to to pass lots of data, consider using cdata sections instead of the simple attributes on a custom element. note: if you're using html5's postmessage() to send a message from unprivileged code to ...
...ocument.createevent("events"); evt.initevent("myextensionevent", true, false); element.dispatchevent(evt); } function extensionanswer(evtanswer) { alert(element.getattribute("attribute3") + " " + evtanswer.target.getattribute("part1")); } basic example of similar idea, extension passes information via attributes and fires event on div in page, here. ...
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Server-side web frameworks - Learn web development
previous overview: first steps next the previous article showed you what the communication between web clients and servers looks like, the nature of http requests and responses, and what a server-side web application needs to do in order to respond to requests from a web browser. with this knowledge under our belt, it's time to explore how web frameworks can simplify these tasks, and give you an idea of how you'd choose a framework for your first server-side web application. prerequisites: basic computer literacy. basic understanding of how server-side code handles and responds to http requests (see client-server overview). objective: to understand how web frameworks can simplify development/maintenance of server-side code and to get readers thinking about selec...
...u? web frameworks provide tools and libraries to simplify common web development operations. you don't have to use a server-side web framework, but it is strongly advised — it will make your life a lot easier. this section discusses some of the functionality that is often provided by web frameworks (not every framework will necessarily provide all of these features!). work directly with http requests and responses as we saw in the last article, web servers and browsers communicate via the http protocol — servers wait for http requests from the browser and then return information in http responses. web frameworks allow you to write simplified syntax that will generate server-side code to work with these requests and responses. this means that you will have an easier job, interacting with e...
...information in http responses. web frameworks allow you to write simplified syntax that will generate server-side code to work with these requests and responses. this means that you will have an easier job, interacting with easier, higher-level code rather than lower level networking primitives. the example below shows how this works in the django (python) web framework. every "view" function (a request handler) receives an httprequest object containing request information, and is required to return an httpresponse object with the formatted output (in this case a string). # django view function from django.http import httpresponse def index(request): # get an httprequest (request) # perform operations using information from the request. # return httpresponse return httpresponse...
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Creating Sandboxed HTTP Connections
r channel = ioservice.newchannelfromuri(uri); to initiate the connection, the asyncopen method is called. it takes two arguments: a listener and a context that is passed to the listener's methods. channel.asyncopen(listener, null); http notifications the above mentioned listener is a nsistreamlistener, which gets notified about events such as http redirects and data availability. onstartrequest - gets called when a new request is initiated. ondataavailable - new data is available. since this is a stream, it could be called multiple times (depending on the size of the returned data, networking conditions, etc). onstoprequest - the request has finished. onchannelredirect - when a redirect happens, a new nsichannel is created, and both the old and new ones are passed in as arguments.
... null, null); // get a channel for that nsiuri gchannel = ioservice.newchannelfromuri(uri); // get an listener var listener = new streamlistener(callbackfunc); gchannel.notificationcallbacks = listener; gchannel.asyncopen(listener, null); function streamlistener(acallbackfunc) { this.mcallbackfunc = acallbackfunc; } streamlistener.prototype = { mdata: "", // nsistreamlistener onstartrequest: function (arequest, acontext) { this.mdata = ""; }, ondataavailable: function (arequest, acontext, astream, asourceoffset, alength) { var scriptableinputstream = components.classes["@mozilla.org/scriptableinputstream;1"] .createinstance(components.interfaces.nsiscriptableinputstream); scriptableinputstream.init(astream); this.mdata += scriptableinputstream.rea...
...text) { this.mdata = ""; }, ondataavailable: function (arequest, acontext, astream, asourceoffset, alength) { var scriptableinputstream = components.classes["@mozilla.org/scriptableinputstream;1"] .createinstance(components.interfaces.nsiscriptableinputstream); scriptableinputstream.init(astream); this.mdata += scriptableinputstream.read(alength); }, onstoprequest: function (arequest, acontext, astatus) { if (components.issuccesscode(astatus)) { // request was successfull this.mcallbackfunc(this.mdata); } else { // request failed this.mcallbackfunc(null); } gchannel = null; }, // nsichanneleventsink onchannelredirect: function (aoldchannel, anewchannel, aflags) { // if redirecting, store the new channel ...
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nsIDownloadProgressListener
this interface works very similarly to the nsiwebprogress interface. it is important to note that there is no service for this listener. rather, the developer must create an object with the methods provided below to implement it. ...
...terface works very similarly to the nsiwebprogress interface. it is important to note that there is no service for this listener. rather, the developer must create an object with the methods provided below to implement it. ...
...ust create an object with the methods provided below to implement it. ...
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Migrating from Firebug - Firefox Developer Tools
ne, is available by pressing ↑/↓ within the devtools command line. inspect object properties by clicking on an object logged within the console you can inspect the object's properties and methods within the dom panel. in the firefox devtools you can also inspect the objects. the difference is that they show the properties and methods within a side panel inside the web console. ...
...ommand line. inspect object properties by clicking on an object logged within the console you can inspect the object's properties and methods within the dom panel. in the firefox devtools you can also inspect the objects. the difference is that they show the properties and methods within a side panel inside the web console. show network requests the console panel in firebug allows to log ajax requests (aka xmlhttprequests). this option is also available within the devtools web console via the net > xhr. furthermore, the web console even allows to display all other network requests via net > log. view json and xml structures to view json and xml responses of ajax requests, firebug has special tabs when expanding the request within the console panel. the devtools web console shows those struc...
...also, the normal command line smartly enters a line break when it recognizes an unfinished command like document. and you hit enter. ...
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IDBObjectStore - Web APIs
f this attribute is null, the application must provide a key for each modification operation. idbobjectstore.name the name of this object store. idbobjectstore.transaction read only the idbtransaction object to which this object store belongs. idbobjectstore.autoincrement read only the value of the auto increment flag for this object store. methods idbobjectstore.add() returns an idbrequest object, and, in a separate thread, creates a structured clone of the value, and stores the cloned value in the object store. this is for adding new records to an object store. idbobjectstore.clear() creates and immediately returns an idbrequest object, and clears this object store in a separate thread. this is for deleting all current records out of an object store. idbobjectstore.count() ret...
...d, in a separate thread, creates a structured clone of the value, and stores the cloned value in the object store. this is for adding new records to an object store. idbobjectstore.clear() creates and immediately returns an idbrequest object, and clears this object store in a separate thread. this is for deleting all current records out of an object store. idbobjectstore.count() returns an idbrequest object, and, in a separate thread, returns the total number of records that match the provided key or idbkeyrange. ...
...() returns an idbrequest object, and, in a separate thread, returns the total number of records that match the provided key or idbkeyrange. if no arguments are provided, it returns the total number of records in the store. idbobjectstore.createindex() creates a new index during a version upgrade, returning a new idbindex object in the connected database. idbobjectstore.delete() returns an idbrequest object, and, in a separate thread, deletes the store object selected by the specified key. this is for deleting individual records out of an object store. idbobjectstore.deleteindex() destroys the specified index in the connected database, used during a version upgrade. ...
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PaymentResponse.complete() - Web APIs
it must be one of the following: success the payment was successfully processed. the user agent may or may not present some form of "payment successful" indication to the user. fail the payment was not successfully processed. ...
...it must be one of the following: success the payment was successfully processed. the user agent may or may not present some form of "payment successful" indication to the user. fail the payment was not successfully processed. ...
...it must be one of the following: success the payment was successfully processed. the user agent may or may not present some form of "payment successful" indication to the user. fail the payment was not successfully processed. ...
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Promises - Archive of obsolete content
nchronous variants. the following examples make use of the task api, which harnesses generator functions to remove some of the syntactic clutter of raw promises, such that asynchronous promise code more closely resembles synchronous, procedural code. ...
...); task.spawn(function* () { var response = yield request("login", { username: user, password: password }); if (response.messages) { try { yield publish({ username: user, messages: response.messages }); } catch (e) { self.reporterror("publication failed", e); } } }); can be converted to a pure promise-based equivalent as such: request("login", { username: user, password: password }) .then(response => { if (response.messages) return publish({ username: user, messages: response.messages }); }) .then(null, (e) => { self.reporterror("publication failed", e); }); file io file io in add-ons should be done via the os.file api, which provides a simple, but powerful, interface for reading, ...
... { tmppath: config.processedpath + "." + math.random() }); // and write out a new config file. config.indexstats = processor.stats; yield os.file.writeatomic(configpath, json.stringify(config), { tmppath: configpath + "." + math.random(), encoding: "utf-8" }) timestamp = new date; }); http requests http requests should, in nearly all circumstances, be made via the standard xmlhttprequest api. while this api does not have direct support for promises, its standard usage is very easy to adapt to a promise-based approach. moreover, many third-party wrappers for the xmlhttprequest api now support promises out of the box. example direct usage task.spawn(function* () { // make the initial ...
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IME handling guide
. the editor refers the stored information for creating or modifying a text node representing a composition string. and before dispatching ecomposition* events, this class removes ascii control characters from dispatching composition event's data in the default settings. although, this can be disabled with "dom.compositionevent.allow_control_characters" pref. finally, this class guarantees that requesting to commit or cancel current composition to ime is perefored synchronously. see forcibly committing composition section for the detail. editor/libeditor mozilla::editoreventlistener listens for trusted dom compositionstart, text and compositionend events and notifies mozilla::editorbase and mozilla::texteditor of the events. when editorbase receives an ecompositionstart (dom "compositionstar...
...e ime and our native ime handler) cannot query the focused editor contents directly. for fixing this issue, we have contentcache classes around process boundary. mozilla::contentcache this is a base class of contentcacheinchild and contentcacheinparent and ipc-aware. this has common members of them including all cache data: mtext whole text in focused editor. this may be too big but ime may request all text in the editor. if we can separate editor contents per paragraph, moving selection between paragraphs generates pseudo focus move, we can reduce this size and runtime cost of contenteventhandler. however, we've not had a plan to do that yet. note that microsoft word uses this hack. mcompositionstart offset of composition string in mtext. when there is no composition, this is uint32_max...
...e event dispatched by textcomposition, that causes a dom text event. finally, if the widget and presshell of the focused editor has not been destroyed yet too, textcomposition dispatches an ecompositionend event which will cause a dom compositionend event. limitation of handling composition currently, editorbase touches undo stack at receiving every widgetcompositionevent. ...
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Observer Notifications
have opened. note that while the window are open and the chrome loaded the tabs in the windows may still be being restored after this notification. note: this notification is specific to firefox and seamonkey 2.0 applications application shutdown these are the topics that you can observe on shutdown, in order of appearance. topic description quit-application-requested something has requested that the application be shutdown. you can cancel the shutdown from here by setting asubject.data to true (asubject is the first parameter to your observer, the data value is an nsisupportsprbool). quit-application-granted all observers have agreed to the shutdown. quit-application the application is about to quit. this can be in response to a n...
...eresting things that happen that the browser alerts you to. topic description browser:purge-session-history sent when the sanitizer runs to purge all history and other information. browser:purge-domain-data sent after domain-specific history and other information have been purged. the data value is a string form of the domain. browser-lastwindow-close-requested sent when the browser wishes to close the last open browser window. when this is sent, it is possible that other windows may still be open, such as the download manager or preferences. the data value is an nsisupportsprbool. recipients may set this to true to abort the close. browser-lastwindow-close-granted sent when all interested parties have responded to the browser-lastwindo...
...nt when the browser wishes to close the last open browser window. when this is sent, it is possible that other windows may still be open, such as the download manager or preferences. the data value is an nsisupportsprbool. recipients may set this to true to abort the close. browser-lastwindow-close-granted sent when all interested parties have responded to the browser-lastwindow-close-requested notification and none of them requested that the close be aborted. after this is sent and handled, the browser window will close. browser-delayed-startup-finished sent when the browser window and all its components have been loaded and initialized. documents these topics indicate notifications you can monitor related to dom documents. topic subject data de...
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nsIDOMMozNetworkStatsManager
lished through a moznetworkstats child object within the navigator object. if the object exists, you can use the network statistics service. ...
...) { /* networkstats is available */ } else { alert("i'm sorry, but networkstats services are not supported."); } method overview nsidomdomrequest getsamples(in nsisupports network, in jsval start, in jsval end, [optional] in jsval options /* networkstatsgetoptions */); nsidomdomrequest addalarm(in nsisupports network, in long threshold, [optional] in jsval options /* networkstatsalarmoptions */); nsidomdomrequest getallalarms([optional] in nsisupports network); nsidomdomrequest removealarms([optional] in long alarmid); nsidomdomrequest clearstats(in nsisupports network); nsidomdomreq...
... in long threshold, [optional] in jsval options /* networkstatsalarmoptions */); nsidomdomrequest getallalarms([optional] in nsisupports network); nsidomdomrequest removealarms([optional] in long alarmid); nsidomdomrequest clearstats(in nsisupports network); nsidomdomrequest clearallstats(); nsidomdomrequest getavailablenetworks(); nsidomdomrequest getavailableservicetypes(); attributes attribute type description samplerate long minimum time in milliseconds between samples stored in the database. read only. maxstorageage long long time in milliseconds recorded by the api until present time. all samples older than maxstorageage from now are...
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Cache.match() - Web APIs
options optional an object that sets options for the match operation. the available options are: ignoresearch: a boolean that specifies whether to ignore the query string in the url. ...
... options optional an object that sets options for the match operation. the available options are: ignoresearch: a boolean that specifies whether to ignore the query string in the url. ...
... options optional an object that sets options for the match operation. the available options are: ignoresearch: a boolean that specifies whether to ignore the query string in the url. ...
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IDBTransaction - Web APIs
the idbtransaction interface of the indexeddb api provides a static, asynchronous transaction on a database using event handler attributes. all reading and writing of data is done within transactions. you use idbdatabase to start transactions, idbtransaction to set the mode of the transaction (e.g. is it readonly or readwrite), and you access an idbobjectstore to make a request. you can also use an idbtransaction object to abort transactions. note: this feature is available in web workers. <div id="interfacediagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 11.666666666666666%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 70" preserveaspectratio="xminymin meet"><a ...
...0" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="221" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">idbtransaction</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} transactions are started when the transaction is created, not when the first request is placed; for example consider this: var trans1 = db.transaction("foo", "readwrite"); var trans2 = db.transaction("foo", "readwrite"); var objectstore2 = trans2.objectstore("foo") var objectstore1 = trans1.objectstore("foo") objectstore2.put("2", "key"); objectstore1.put("1", "key"); after the code is executed the object store should contain the value "2", since trans2 should run after trans1...
...re("foo") var objectstore1 = trans1.objectstore("foo") objectstore2.put("2", "key"); objectstore1.put("1", "key"); after the code is executed the object store should contain the value "2", since trans2 should run after trans1. ...
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Starting up and shutting down a WebXR session - Web APIs
st the specific case you need. permissions and security there are a number of security measures in place revolving around webxr. first among these is that use of immersive-vr mode—which entirely replaces the user's view of the world—requires that the xr-spatial-tracking feature policy be in place. on top of that, the document needs to be secure and currently focused. finally, you must call requestsession() from a user event handler, such as the handler for the click event. for more specifics about securing webxr actitvities and usage, see the article permissions and security for webxr. confirming the session type you need is available before trying to create a new webxr session, it's often wise to first check to see if the user's hardware and software support the presentation mode you w...
... const immersiveok = await navigator.xr.issessionsupported("immersive-vr"); if (immersiveok) { // create and use an immersive vr session } else { // create an inline session instead, or tell the user about the // incompatibility if inline is required } creating and starting the session a webxr session is represented by an xrsession object. to obtain an xrsession, you call your xrsystem's requestsession() method, which returns a promise that resolves with an xrsession if it's able to establish one successfully. fundamentally, that looks like this: xr.requestsession("immersive-vr").then((session) => { xrsession = session; /* continue to set up the session */ }); note the parameter passed into requestsession() in this code snippet: immersive-vr. this string specifies the type of webx...
...within the context of the document window. if the session couldn't be created for some reason—such as feature policy disallowing its use or the user declining to grant permission to use the headset—the promise gets rejected. so a more complete function that starts up and returns a webxr session could look like this: async function createimmersivesession(xr) { try { session = await xr.requestsession("immersive-vr"); return session; } catch(error) { throw error; } } this function returns the new xrsession or throws an exception if an error occurs while creating the session. customizing the session in addition to the display mode, the requestsession() method can take an optional object with initialization parameters to customize the session. currently, the only configura...
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Web Locks API - Web APIs
act concept representing some potentially shared resource, identified by a name chosen by the web app. ...
...s wants to ensure that only one tab is syncing data between the network and indexed db, each tab could try to acquire a "my_net_db_sync" lock, but only one tab will succeed (the leader election pattern.) the api is used as follows: the lock is requested. work is done while holding the lock in an asynchronous task. the lock is automatically released when the task completes. navigator.locks.request('my_resource', async lock => { // the lock has been acquired. await do_something(); await do_something_else(); // now the lock will be released. }); while a lock is held, requests for the same lock from this execution context, or from other tabs/workers, will be queued. the first queued request will be granted only when the lock is released. the api provides optional functionality that...
...onous task shared and exclusive lock modes conditional acquisition diagnostics to query the state of locks in an origin an escape hatch to protect against deadlocks locks are scoped to origins; the locks acquired by a tab from https://example.com have no effect on the locks acquired by a tab from https://example.org:8080 as they are separate origins. ...
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Evolution of HTTP - HTTP
s now considered as the official start of the world wide web as a public project. the http protocol used in those early phases was very simple, later dubbed http/0.9, and sometimes as the one-line protocol. http/0.9 – the one-line protocol the initial version of http had no version number; it has been later called 0.9 to differentiate it from the later versions. http/0.9 is extremely simple: requests consist of a single line and start with the only possible method get followed by the path to the resource (not the url as both the protocol, server, and port are unnecessary once connected to the server). get /mypage.html the response is extremely simple too: it only consisted of the file itself. <html> a very simple html page </html> unlike subsequent evolutions, there were no http headers,...
...ransmitted, but no other type of documents. there were no status or error codes: in case of a problem, a specific html file was send back with the description of the problem contained in it, for human consumption. ...
... it, for human consumption. http/1.0 – building extensibility http/0.9 was very limited and both browsers and servers quickly extended it to be more versatile: versioning information is now sent within each request (http/1.0 is appended to the get line) a status code line is also sent at the beginning of the response, allowing the browser itself to understand the success or failure of the request and to adapt its behavior in consequence (like in updating or using its local cache in a specific way) the notion of http headers has been introduced, both for the requests and the responses, allowing metadata to be transmitted and making the protocol extremely flexible and extensible. with the help of the new http headers, the ability to transmit other documents than plain html files has been ...
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A typical HTTP session - HTTP
in client-server protocols, like http, sessions consist of three phases: the client establishes a tcp connection (or the appropriate connection if the transport layer is not tcp). the client sends its request, and waits for the answer. the server processes the request, sending back its answer, providing a status code and appropriate data. as of http/1.1, the connection is no longer closed after completing the third phase, and the client is now granted a further request: this means the second and third phases can now be performed any number of times. establishing a connection in client-server protocols, it is the client which establishes the connection. opening a connection in http means initiating a connection in the underlying transport layer, usually this is tcp. with tcp the default...
...cp the default port, for an http server on a computer, is port 80. other ports can also be used, like 8000 or 8080. the url of a page to fetch contains both the domain name, and the port number, though the latter can be omitted if it is 80. see identifying resources on the web for more details. ...
... page to fetch contains both the domain name, and the port number, though the latter can be omitted if it is 80. see identifying resources on the web for more details. note: the client-server model does not allow the server to send data to the client without an explicit request for it. to work around this problem, web developers use several techniques: ping the server periodically via the xmlhttprequest, fetch apis, using the websockets api, or similar protocols. ...
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Types of attacks - Web security
k-jacking click-jacking is the practice of tricking a user into clicking on a link, button, etc. that is other than what the user thinks it is. this can be used, for example, to steal login credentials or to get the user's unwitting permission to install a piece of malware. (click-jacking is sometimes called "user interface redressing", though this is a misuse of the term "redress".) cross-site request forgery (csrf) cross-site scripting (xss) cross-site scripting (xss) is a security exploit which allows an attacker to inject into a website malicious client-side code. this code is executed by the victims and lets the attackers bypass access controls and impersonate users. according to the open web application security project, xss was the seventh most common web app vulnerability in 2017. th...
... app does not employ enough validation or encoding. the user's browser cannot detect the malicious script is untrustworthy, and so gives it access to any cookies, session tokens, or other sensitive site-specific information, or lets the malicious script rewrite the html content. cross-site scripting attacks usually occur when 1) data enters a web app through an untrusted source (most often a web request) or 2) dynamic content is sent to a web user without being validated for malicious content. the malicious content often includes javascript, but sometimes html, flash, or any other code the browser can execute. the variety of attacks based on xss is almost limitless, but they commonly include transmitting private data like cookies or other session information to the attacker, redirecting the vic...
...other malicious operations on the user's machine under the guise of the vulnerable site. xss attacks can be put into three categories: stored (also called persistent), reflected (also called non-persistent), or dom-based. stored xss attacks the injected script is stored permanently on the target servers. the victim then retrieves this malicious script from the server when the browser sends a request for data. reflected xss attacks when a user is tricked into clicking a malicious link, submitting a specially crafted form, or browsing to a malicious site, the injected code travels to the vulnerable website. the web server reflects the injected script back to the user's browser, such as in an error message, search result, or any other response that includes data sent to the server as part of ...
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Efficient animation for web games - Game development
there are several techniques worth knowing that will improve the performance of your game or application whilst also using less battery life, especially on low-end devices. ...
... to be animated quickly, these are pretty much the only ones semi-guaranteed to be fast across all browsers. something to be careful of is that overflow may end up causing re-layout, or other expensive calculations. if you are setting a transform on something that would overlap its container’s bounds, you may want to set overflow: hidden on that container for the duration of the animation. ...
...ut, or other expensive calculations. if you are setting a transform on something that would overlap its container’s bounds, you may want to set overflow: hidden on that container for the duration of the animation. use requestanimationframe when you are animating <canvas> content, or when your dom animations absolutely must synchronise with canvas content animations, do make sure to use window.requestanimationframe, and not older methods such as window.settimeout. assuming you are running in an arbitrary browsing session, you can never really know how long the browser will take to draw a particular frame. requestanimationframe causes the browser to redraw and call your function before that frame gets to the screen. the downside of using this vs. settimeout is that your animations must be time-...
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Introduction to web APIs - Learn web development
n their own are very commonly used. this seemingly small detail has had a huge impact on the performance and behaviour of sites — if you just need to update a stock listing or list of available new stories, doing it instantly without having to reload the whole entire page from the server can make the site or app feel much more responsive and "snappy". apis that make this possible include xmlhttprequest and the fetch api. you may also come across the term ajax, which describes this technique. find out more about such apis in fetching data from the server. apis for drawing and manipulating graphics are now widely supported in browsers — the most popular ones are canvas and webgl, which allow you to programmatically update the pixel data contained in an html <canvas> element to create 2d and 3d...
...el data contained in an html <canvas> element to create 2d and 3d scenes. for example, you might draw shapes such as rectangles or circles, import an image onto the canvas, and apply a filter to it such as sepia or grayscale using the canvas api, or create a complex 3d scene with lighting and textures using webgl. such apis are often combined with apis for creating animation loops (such as window.requestanimationframe()) and others to make constantly updating scenes like cartoons and games. audio and video apis like htmlmediaelement, the web audio api, and webrtc allow you to do really interesting things with multimedia such as creating custom ui controls for playing audio and video, displaying text tracks like captions and subtitles along with your videos, grabbing video from your web camera to...
...his article first before continuing. some web apis contain no events, but most contain at least a few. the handler properties that allow us to run functions when events fire are generally listed in our reference material in separate "event handlers" sections. we already saw a number of event handlers in use in our web audio api example above. ...
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Third-party APIs - Learn web development
ted using the mapquest.tilelayer() method), and the default zoom level. this is all the information the mapquest api needs to plot a simple map. the server you are connecting to handles all the complicated stuff, like displaying the correct map tiles for the area being shown, etc. note: some apis handle access to their functionality slightly differently, requiring the developer to make an http request to a specific url pattern to retrieve data. these are called restful apis — we'll show an example later on. they usually require api keys security for browser apis tends to be handled by permission prompts, as discussed in our first article. the purpose of these is so that the user knows what is going on in the websites they visit and is less likely to fall victim to someone using an api in ...
...nt way, but the pattern is relatively similar for most of them. requiring a key enables the api provider to hold users of the api accountable for their actions. when the developer has registered for a key, they are then known to the api provider, and action can be taken if they start to do anything malicious with the api (such as tracking people's location or trying to spam the api with loads of requests to stop it working, for example). the easiest action would be to just revoke their api privileges. extending the mapquest example let's add some more functionality to the mapquest example to show how to use some other features of the api. to start this section, make yourself a copy of the mapquest starter file, in a new directory. if you've already cloned the examples repository, you'll ...
...ere are other alternatives available. a restful api — nytimes now let's look at another api example — the new york times api. this api allows you to retrieve new york times news story information and display it on your site. this type of api is known as a restful api — instead of getting data using the features of a javascript library like we did with mapquest, we get data by making http requests to specific urls, with data like search terms and other properties encoded in the url (often as url parameters). this is a common pattern you'll encounter with apis. an approach for using third-party apis below we'll take you through an exercise to show you how to use the nytimes api, which also provides a more general set of steps to follow that you can use as an approach for working with new...
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Working with JSON - Learn web development
t header = document.queryselector('header'); const section = document.queryselector('section'); we have made our json data available on our github, at https://mdn.github.io/learning-area/javascript/oojs/json/superheroes.json. we are going to load it into our page, and use some nifty dom manipulation to display it, like this: obtaining the json to obtain the json, we use an api called xmlhttprequest (often called xhr). this is a very useful javascript object that allows us to make network requests to retrieve resources from a server via javascript (e.g. images, text, json, even html snippets), meaning that we can update small sections of content without having to reload the entire page. this has led to more responsive web pages, and sounds exciting, but it is beyond the scope of this article...
...ven html snippets), meaning that we can update small sections of content without having to reload the entire page. this has led to more responsive web pages, and sounds exciting, but it is beyond the scope of this article to teach it in much more detail. to start with, we store the url of the json we want to retrieve in a variable. ...
...ire page. this has led to more responsive web pages, and sounds exciting, but it is beyond the scope of this article to teach it in much more detail. to start with, we store the url of the json we want to retrieve in a variable. add the following at the bottom of your javascript code: let requesturl = 'https://mdn.github.io/learning-area/javascript/oojs/json/superheroes.json'; to create a request, we need to create a new request object instance from the xmlhttprequest constructor, using the new keyword. add the following below your last line: let request = new xmlhttprequest(); now we need to open the request using the open() method. add the following line: request.open('get', requesturl); this takes at least two parameters — there are other optional parameters available. we o...
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sslfnc.html
following parameters: option one of the following values (except as noted, the factory setting is "off"): ssl_security enables use of security protocol. factory setting is on. warning: if you turn this option off, the session will not be an ssl session and will not have certificate-based authentication, tamper detection, or encryption. ssl_request_certificate is a server option that requests a client to authenticate itself. ssl_require_certificate is a server option that requires a client to authenticate itself (only if ssl_request_certificate is also on). if client does not provide certificate, the connection terminates. default state is a third state similar to on, that provides backward compatibility with older netscape se...
...spr file descriptor for the ssl socket. option one of the following values (default values are determined by the use of ssl_optionsetdefault): ssl_security enables use of security protocol. warning: if you turn this option off, the session will not be an ssl session and will not have certificate-based authentication, tamper detection, or encryption. ssl_request_certificate is a server option that requests a client to authenticate itself. ssl_require_certificate is a server option that requires a client to authenticate itself (only if ssl_request_certificate is also on). if client does not provide certificate, the connection terminates. ssl_handshake_as_client controls the behavior of pr_accept,. if this option is off, the pr_accept configu...
...e turns option off. returns the function returns one of these values: if successful, secsuccess. if unsuccessful, returns secfailure. use pr_geterror to obtain the error code. description keep the following in mind when deciding on the operating parameters you want to use with a particular socket: turning on ssl_require_certificate will have no effect unless ssl_request_certificate is also turned on. if you enable ssl_request_certificate, then you should explicitly enable or disable ssl_require_certificate rather than allowing it to default. enabling the ssl_require_certificate option is not recommended. if the client has no certificate and this option is enabled, the client's connection terminates with an error. the user is likely to think something is wrong wi...
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URLs - Plugins
« previousnext » this chapter describes retrieving urls and displaying them on specified target pages, posting data to an http server, uploading files to an ftp server, and sending mail. uniform resource locator (url) protocols provide a means for locating and accessing resources that are available on the internet and on intranets. plug-ins can request and receive the data associated with urls of any type that the browser can handle, including http, ftp, news, mailto, and gopher. the table below summarizes urls supported by gecko. in addition, gecko may support urls not listed on this table. url scheme description about locates browser information or "fun" pages. file (host-specific filenames) locates files on a specific host computer rather tha...
...lay data retrieved from a url in a specified target window or frame, or deliver it to the plug-in instance in a new stream. this is the way that plug-ins provide hyperlinks to other documents or retrieve data from the network. if the browser cannot locate the url and retrieve the data, it does not create a stream for the instance; in this case, the plug-in receives notification of the result. to request a stream and receive notification of the result in all cases, use npn_geturlnotify. for http urls, the browser resolves npn_geturl as the http server method get, which requests url objects. note that npn_geturl is typically asynchronous: it returns immediately and only later handles the request, such as displaying the url or creating the stream for the instance and writing the data. for this re...
... the target parameter represents the destination where the url will be displayed, a window or frame. ...
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Guide to the Fullscreen API - Web APIs
this article demonstrates how to use the fullscreen api to place a given element into full-screen mode, as well as how to detect when the browser enters or exits full-screen mode. activating full-screen mode given an element that you'd like to present in full-screen mode (such as a <video>, for example), you can present it in full-screen mode by simply calling its requestfullscreen() method. ...
...de (such as a <video>, for example), you can present it in full-screen mode by simply calling its requestfullscreen() method. let's consider this <video> element: <video controls id="myvideo"> <source src="somevideo.webm"></source> <source src="somevideo.mp4"></source> </video> we can put that video into full-screen mode as follows: var elem = document.getelementbyid("myvideo"); if (elem.requestfullscreen) { elem.requestfullscreen(); } this code checks for the existence of the requestfullscreen() method before calling it. presentation differences it's worth noting a key difference here between the gecko and webkit implementations at this time: gecko automatically adds css rules to the element to stretch it to fill the screen: "width: 100%; height: 100%". webkit doesn't do this; inst...
...hich contains the element receives a fullscreenchange event. when fullscreen mode is exited, the document again receives a fullscreenchange event. note that the fullscreenchange event doesn't provide any information itself as to whether the document is entering or exiting fullscreen mode, but if the document has a non null fullscreenelement, you know you're in fullscreen mode. when a fullscreen request fails it's not guaranteed that you'll be able to switch into fullscreen mode. for example, <iframe> elements have the allowfullscreen attribute in order to opt-in to allowing their content to be displayed in fullscreen mode. in addition, certain kinds of content, such as windowed plug-ins, cannot be presented in fullscreen mode. attempting to put an element which can't be displayed in fullscreen...
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MediaDevices.getUserMedia() - Web APIs
that stream can include, for example, a video track (produced by either a hardware or virtual video source such as a camera, video recording device, screen sharing service, and so forth), an audio track (similarly, produced by a physical or virtual audio source like a microphone, a/d converter, or the like), and possibly other track types. it returns a promise that resolves to a mediastream object. ...
...), and possibly other track types. it returns a promise that resolves to a mediastream object. if the user denies permission, or matching media is not available, then the promise is rejected with notallowederror or notfounderror respectively. note: it's possible for the returned promise to neither resolve nor reject, as the user is not required to make a choice at all and may simply ignore the request. generally, you will access the mediadevices singleton object using navigator.mediadevices, like this: async function getmedia(constraints) { let stream = null; try { stream = await navigator.mediadevices.getusermedia(constraints); /* use the stream */ } catch(err) { /* handle the error */ } } similarly, using the raw promises directly, the code looks like this: navigat...
...ote: if the current document isn't loaded securely, navigator.mediadevices will be undefined, and you cannot use getusermedia(). see security for more information on this and other security issues related to using getusermedia(). ...
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Pointer Lock API - Web APIs
ointer lock does not release the mouse until an explicit api call is made or the user uses a specific release gesture. it is not limited by browser or screen boundaries. it continues to send events regardless of mouse button state. it hides the cursor. method/properties overview this section provides a brief description of each property and method related to the pointer lock specification. ...
...it is not limited by browser or screen boundaries. it continues to send events regardless of mouse button state. it hides the cursor. method/properties overview this section provides a brief description of each property and method related to the pointer lock specification. requestpointerlock() the pointer lock api, similar to the fullscreen api, extends dom elements by adding a new method, requestpointerlock(). ...
.... method/properties overview this section provides a brief description of each property and method related to the pointer lock specification. requestpointerlock() the pointer lock api, similar to the fullscreen api, extends dom elements by adding a new method, requestpointerlock(). ...
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Rendering and the WebXR frame animation callback - Web APIs
ndering. this article covers the process of driving the frames of the xr scene to the device in the rendering loop, using the xrsession to obtain an xrframe object representing each frame, which is then used to prepare the framebuffer for delivery to the xr device. before you can render the virtual environment, you need to establish a webxr session by creating an xrsession using the navigator.xr.requestsession() method; you also need to associate the session with a framebuffer and perform other setup tasks. these setup tasks are described in the article setting up and shutting down a webxr session. preparing the renderer once the xr session has been set up, with the webgl framebuffer connected and webgl primed with the data it needs in order to render the scene, you can set up the renderer to ...
...aring the renderer once the xr session has been set up, with the webgl framebuffer connected and webgl primed with the data it needs in order to render the scene, you can set up the renderer to start running. this begins with getting the reference space in which you want to draw, with its origin and orientation set at the viewer's starting position and viewing direction. ...
...cene, you can set up the renderer to start running. this begins with getting the reference space in which you want to draw, with its origin and orientation set at the viewer's starting position and viewing direction. once that's in hand, you request that the browser call your rendering function the next time it needs a framebuffer to render your scene. this is done by calling the xrsession method requestanimationframe(). ...
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window.cancelAnimationFrame() - Web APIs
other browsers can use something like date.now(). ...
...other browsers can use something like date.now(). ...
...other browsers can use something like date.now(). ...
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Using HTTP cookies - HTTP
it remembers stateful information for the stateless http protocol. ...
...it remembers stateful information for the stateless http protocol. ...
...ping carts, game scores, or anything else the server should remember personalization user preferences, themes, and other settings tracking recording and analyzing user behavior cookies were once used for general client-side storage. while this was legitimate when they were the only way to store data on the client, it is now recommended to use modern storage apis. ...
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Redirections in HTTP - HTTP
special kind of response, called a http redirect, for this operation. redirects accomplish numerous goals: temporary redirects during site maintenance or downtime permanent redirects to preserve existing links/bookmarks after changing the site's urls, progress pages when uploading a file, etc. principle in http, redirection is triggered by a server sending a special redirect response to a request. redirect responses have status codes that start with 3, and a location header holding the url to redirect to. when browsers receive a redirect, they immediately load the new url provided in the location header. besides the small performance hit of an additional round-trip, users rarely notice the redirection. there are several types of redirects, sorted into three categories: permanent re...
... a web site. 308 permanent redirect method and body not changed. reorganization of a web site, with non-get links/operations. [1] the specification did not intend to allow method changes, but there are existing user agents that do change their method. 308 was created to remove the ambiguity of the behavior when using non-get methods. temporary redirections sometimes the requested resource can't be accessed from its canonical location, but it can be accessed from another place. in this case, a temporary redirect can be used. search engine robots and other crawlers don't memorize the new, temporary url. temporary redirections are also used when creating, updating, or deleting resources, to show temporary progress pages. code text method handling typica...
... by the browser as a web page, lists the possible redirections and the user clicks on one to select it. code text typical use case 300 multiple choice not many: the choices are listed in an html page in the body. machine-readable choices are encouraged to be sent as link headers with rel=alternate. 304 not modified sent for revalidated conditional requests. indicates that the cached response is still fresh and can be used. alternative way of specifying redirections http redirects aren't the only way to define redirections. there are two others: html redirections with the <meta> element javascript redirections via the dom html redirections http redirects are the best way to create redirections, but sometimes you don't have control ov...
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Populating the page: how browsers work - Web Performance
s want and expect web experiences with content that is fast to load and smooth to interact with. two major issues in web performance are understanding issues having to do with latency and issues having to do with the fact that for the most part, browsers are single threaded. latency is our main threat to overcome to ensure a fast load. to be fast to load, the developers’ goals include sending requested information as fast as possible, or at least seem super fast. network latency is the time it takes to transmit bytes over-the-air to computers. web performance is what we have to do to make the page load happen as quickly as possible. for the most part, browsers are considered single threaded. for smooth interactions, the developer's goal is to ensure performant site interactions, from smooth ...
... and still always be available to handle user interactions. web performance can be improved by understanding the single-threaded nature of the browser and minimizing the main thread's responsibilities, where possible and appropriate, to ensure rendering is smooth and responses to interactions are immediate. navigation navigation is the first step in loading a web page. it occurs whenever a user requests a page by entering a url into the address bar, clicking a link, submitting a form, as well as other actions. one of the goals of web performance is to minimize the amount of time a navigation takes to complete. in ideal conditions, this usually doesn't take too long, but latency and bandwidth are foes which can cause delays. dns lookup the first step of navigating to a web page is finding whe...
...ns, this usually doesn't take too long, but latency and bandwidth are foes which can cause delays. dns lookup the first step of navigating to a web page is finding where the assets for that page are located. if you navigate to https://example.com, the html page is located on the server with ip address of 93.184.216.34. if you’ve never visited this site, a dns lookup must happen. your browser requests a dns lookup, which is eventually fielded by a name server, which in turn responds with an ip address. after this initial request, the ip will likely be cached for a time, which speeds up subsequent requests by retrieving the ip address from the cache instead of contacting a name server again. dns lookups usually only need to be done once per hostname for a page load. however, dns lookups must ...
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Navigation and resource timings - Web Performance
trics measuring a browser's document navigation events. resource timings are detailed network timing measurements regarding the loading of an application's resources. ...
...it has been replaced with the performancenavigationtiming api. the performance timing api provided read only times, in milliseconds(ms), describing at what time each point in the page loading process was reached. ...
... api. the performance timing api provided read only times, in milliseconds(ms), describing at what time each point in the page loading process was reached. as displayed in the image below, the navigation process goes from navigationstart, unloadeventstart, unloadeventend, redirectstart, redirectend, fetchstart, domainlookupstart, domainlookupend, connectstart , connectend, secureconnectionstart, requeststart, responsestart, responseend, domloading, dominteractive, domcontentloadedeventstart, domcontentloadedeventend, domcomplete, loadeventstart, and loadeventend. with the metrics above, and a little bit of math, we can calculate many important metrics like time to first byte, page load time, dns lookup, and whether the connection is secure. to help measure the time it takes to complete all t...
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JavaScript crypto - Archive of obsolete content
illa defines a special javascript object to allow web pages access to certain cryptographic-related services. these services are a balance between the functionality web pages need and the requirement to protect users from malicious web sites. most of these services are available via the dom window object as window.crypto. services are provided to enable: smart card events, generating certificate requests, importing user certs, generating random numbers, logging out of your tokens, and signing text. handling smart card events web sites can make themselves more smartcard friendly by listening for smartcard insertion and removal events. to enable your document to receive these events, you must first tell the crypto system you are interested by setting window.crypto.enablesmartcardevents to true. ...
...ster; document.body.onunload = deregister; </script> with the above example, your web site will automatically reload anytime a smartcard is inserted or removed. this allows the page to automatically login and logout based on the presence of the smartcard. generating keys and issuing user certificates there are several crypto object methods used in generating keys for certificates: generatecrmfrequest(), importusercertificates(). the generatecrmfrequest() function generates a key and creates a crmf request object. this object can be passed to a ca using a webform. the importusercertificates() function loads certificates into the nss database or smartcard if the corresponding key is found there. the popchallengeresponse() function is not implemented. overview of the new cert issuing process...
...t. this object can be passed to a ca using a webform. the importusercertificates() function loads certificates into the nss database or smartcard if the corresponding key is found there. the popchallengeresponse() function is not implemented. ...
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Handling common JavaScript problems - Learn web development
ented in conflicting, incompatible ways, causing developers many nightmares. such incompatibility problems persisted well into the early 2000s, as old browsers were still being used and still needed supporting. this is one of the main reasons why libraries like jquery came into existence — to abstract away differences in browser implementations (e.g. see the code snippet in how to make an http request) so developers only have to write one simple bit of code (see jquery.ajax()). jquery (or whatever library you are using) will then handle the differences in the background, so you don't have to. things have improved significantly since then; modern browsers do a good job of supporting "classic javascript features", and the requirement to use such code has diminished as the requirement to support...
..., you need to define a function to add the handler separately, calling it on each iteration and passing it the current value of para and i each time (or something similar). see good-for-loop.html (see the source code also) for a version that works. making sure asynchronous operations have returned before trying to use the values they return. for example, this ajax example checks to make sure the request is complete and the response has been returned before trying to use the response for anything. this kind of operation has been made easier to handle by the introduction of promises to the javascript language. note: buggy javascript code: the 10 most common mistakes javascript developers make has some nice discussions of these common mistakes and more. linters as with html and css, you can e...
...f we look at the source code, the relevant code section is this: function showheroes(jsonobj) { let heroes = jsonobj['members']; for(i = 0; i < heroes.length; i++) { ... so the code falls over as soon as we try to access a property of jsonobj (which as you might expect, is supposed to be a json object). this is supposed to be fetched from an external .json file using the following xmlhttprequest call: let requesturl = 'https://mdn.github.io/learning-area/javascript/oojs/json/superheroes.json'; let request = new xmlhttprequest(); request.open('get', requesturl); request.send(); let superheroes = request.response; populateheader(superheroes); showheroes(superheroes); but this fails. the console api you may already know what is wrong with this code, but let's explore it some more to sh...
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Listening to events on all tabs
alled progress listener, call removetabsprogresslistener(): gbrowser.removetabsprogresslistener(myprogresslistener); implementing a listener the listener object itself has five methods it can implement to handle various events: onlocationchange called when the uri of the document displayed in the tab changes. void onlocationchange( nsidomxulelement abrowser, nsiwebprogress awebprogress, nsirequest arequest, nsiuri alocation [optional] in unsigned long aflags ); parameters abrowser the browser representing the tab whose location changed. awebprogress the progress instance responsible for handling the events. arequest the nsirequest object representing the associated request. alocation an nsiuri object indicating the tab's new uri. aflags optiona...
...uest. alocation an nsiuri object indicating the tab's new uri. aflags optional: this is a value which explains the situation or the reason why the location has changed. optional from gecko 10 onprogresschange called when updated progress information for the download of a document is available. ...
... alocation an nsiuri object indicating the tab's new uri. aflags optional: this is a value which explains the situation or the reason why the location has changed. optional from gecko 10 onprogresschange called when updated progress information for the download of a document is available. void onprogresschange( nsidomxulelement abrowser, nsiwebprogress awebprogress, nsirequest arequest, print32 acurselfprogress, print32 amaxselfprogress, print32 acurtotalprogress, print32 amaxtotalprogress ); parameters abrowser the browser representing the tab for which updated progress information is being provided. awebprogress the progress instance responsible for handling the events. arequest the nsirequest object representing the associated request. a...
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nsIMsgCloudFileProvider
nsimsgcloudfileprovider is the interface that must be implemented by new filelink providers. ...
...he interface that must be implemented by new filelink providers. ...
...sisupports method overview void init(in string aaccountkey); void uploadfile(in nsilocalfile afile, in nsirequestobserver acallback); acstring urlforfile(in nsilocalfile afile); void cancelfileupload(in nsilocalfile afile); void refreshuserinfo(in boolean awithui, in nsirequestobserver acallback); void deletefile(in nsilocalfile afile, in nsirequestobserver acallback); void createnewaccount(in acstring aemailaddress, in acstring apassword, in acstring afirstname, in acstring alastname, in nsirequestobserver acallback); void createexistingaccount(in nsirequestobserver acallback); acstring providerurlforerror(in unsigned long aerror); attributes att...
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AddressErrors - Web APIs
see the examples below to see how this works. ...
... see the examples below to see how this works. properties addressline a domstring which, if present, indicates that the addressline property of the paymentaddress could not be validated. ...
...details); } see handling address changes for a description of how this code works. complete example here we'll see a complete, working version of the example above (except of course that it's not connected to an actual payment handler, so no payments are actually processed). in the example, we're handling a donation to an organization that will be sending a "thank you" gift to the donor, so it requests shipping information along with allowing the donation payment itself. javascript payment request data first, we declare the variables supportedhandlers, which is compatible with paymentmethoddata, and defaultpaymentdetails, which is a paymentdetailsupdate object. let supportedhandlers = [ { supportedmethods: "basic-card", data: { supportednetworks: ["visa", "mastercard", "ame...
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Storage Access API - Web APIs
the storage access api provides a way for embedded, cross-origin content to gain unrestricted access to storage that it would normally only have access to in a first-party context (we refer to this as an origin’s first-party storage). the api provides methods that allow embedded resources to check whether they currently have access to their first-party storage, and to request access to their first-party storage from the user agent. concepts and usage most browsers implement a number of storage access policies that restrict access to cookies and site data for embedded, cross-origin resources. these restrictions range from giving embedded resources under each top-level origin a unique storage space to outright blocking of storage access when resources are loaded in a third-party cont...
...have often encouraged users to add their site as an exception or to disable the policy entirely. as a consequence, users who wish to continue to interact with embedded content are forced to greatly relax their blocking policy for resources loaded from all embedded origins and possibly across all websites. the storage access api is intended to solve this problem; embedded cross-origin content can request unrestricted access to its first-party storage on a site-by-site basis via the document.requeststorageaccess() method, and check whether it already has access via the document.hasstorageaccess() method. in addition, sandboxed <iframe>s cannot be granted storage access by default for security reasons. the api therefore also adds the allow-storage-access-by-user-activation sandbox token. the embed...
...te-by-site basis via the document.requeststorageaccess() method, and check whether it already has access via the document.hasstorageaccess() method. in addition, sandboxed <iframe>s cannot be granted storage access by default for security reasons. the api therefore also adds the allow-storage-access-by-user-activation sandbox token. the embedding website needs to add this to allow storage access requests to be successful, along with allow-scripts and allow-same-origin to allow it to call the api, and execute in an origin that can have cookies: <iframe sandbox="allow-storage-access-by-user-activation allow-scripts allow-same-origin"> ... </iframe> the api is designed to limit the potential storage exceptions to origins for which the user has shown an intent t...
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Using bounded reference spaces - Web APIs
ence spaces, you should made sure to support bounded reference spaces as an option rather than as a required feature unless you have special knowledge of the environment in which your code will run. ...
...rsession) { navgator.xr.requestsession("immersive-vr"), { requiredfeatures: ["local-floor"], optionalfeatures: ["bounded-floor"] }).then((session) => { xrsession = session; startsessionanimation(); }); } } this function, called when the user clicks on a button to start the xr experience, works as usual, exiting at once if a session is already in place, then requesting a new session using immersive-vr mode. the options specified when requesting the session indicate that at a minimum, the session must be compatible with the local-floor reference space, but that it would be nice if the bounded-floor space were supported as well. once the session has been created, our startsessionanimation() function can try to establish a bounded-floor reference space, and if...
...he options specified when requesting the session indicate that at a minimum, the session must be compatible with the local-floor reference space, but that it would be nice if the bounded-floor space were supported as well. once the session has been created, our startsessionanimation() function can try to establish a bounded-floor reference space, and if it fails to do so it can then fall back to requesting a local-floor reference space instead (in which we will have to handle boundaries ourselves). this way, our session will start up regardless of whether or not the user's platform is able to provide bounded reference spaces. creating the reference space simply requesting support for bounded-floor when calling the xrsystem method requestsession() isn't enough to get a bounded space. you need ...
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Web Authentication API - Web APIs
y be a physical token, such as a usb or bluetooth security key. registration a typical registration process has six steps, as illustrated in figure 1 and described further below. this is a simplification of the data required for the registration process that is only intended to provide an overview. the full set of required fields, optional fields, and their meanings for creating a registration request can be found in the publickeycredentialcreationoptions dictionary. likewise, the full set of response fields can be found in the publickeycredential interface (where publickeycredential.response is the authenticatorattestationresponse interface). note most javascript programmers that are creating an application will only really care about steps 1 and 5 where the create() function is called and su...
...eate() function is called and subsequently returns; however, steps 2, 3, and 4 are essential to understanding the processing that takes place in the browser and authenticator and what the resulting data means. figure 1 - a diagram showing the sequence of actions for a web authentication registration and the essential data associated with each action. the registration steps are: application requests registration - the application makes the initial registration request. the protocol and format of this request is outside of the scope of the web authentication api. server sends challenge, user info, and relying party info - the server sends a challenge, user information, and relying party information to the javascript program. the protocol for communicating with the server is not specified an...
...f the web authentication api. server sends challenge, user info, and relying party info - the server sends a challenge, user information, and relying party information to the javascript program. the protocol for communicating with the server is not specified and is outside of the scope of the web authentication api. typically, server communications would be rest over https (probably using xmlhttprequest or fetch), but they could also be soap, rfc 2549 or nearly any other protocol provided that the protocol is secure. the parameters received from the server will be passed to the create() call, typically with little or no modification and returns a promise that will resolve to a publickeycredential containing an authenticatorattestationresponse. note that it is absolutely critical that the challen...
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HTTP Messages - HTTP
http messages are composed of textual information encoded in ascii, and span over multiple lines. in http/1.1, and earlier versions of the protocol, these messages were openly sent across the connection. in http/2, the once human-readable message is now divided up into http frames, providing optimization and performance improvements. web developers, or webmasters, rarely craft these textual http messages themselves: software, a web browser, proxy, or web server, perform this action. ...
... craft these textual http messages themselves: software, a web browser, proxy, or web server, perform this action. they provide http messages through config files (for proxies or servers), apis (for browsers), or other interfaces. the http/2 binary framing mechanism has been designed to not require any alteration of the apis or config files applied: it is broadly transparent to the user. http requests, and responses, share similar structure and are composed of: a start-line describing the requests to be implemented, or its status of whether successful or a failure. this start-line is always a single line. an optional set of http headers specifying the request, or describing the body included in the message. a blank line indicating all meta-information for the request has been sent. an o...
... composed of: a start-line describing the requests to be implemented, or its status of whether successful or a failure. this start-line is always a single line. an optional set of http headers specifying the request, or describing the body included in the message. a blank line indicating all meta-information for the request has been sent. an optional body containing data associated with the request (like content of an html form), or the document associated with a response. the presence of the body and its size is specified by the start-line and http headers. the start-line and http headers of the http message are collectively known as the head of the requests, whereas its payload is known as the body. ...
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Intercepting Page Loads - Archive of obsolete content
his because it will be visible to the user and it will look like a bug. there are better ways to intercept page loads before any content is downloaded, and before the user sees anything in the tab. http observers another common way of detecting and intercepting loads is using http observer topics. this is how the tamper data extension and others do it. http notifications are fired for all http requests originating from firefox. they are window-independent, so it is better to keep your observer code in non-chrome objects (your xpcom service or jsm module). otherwise you have to make sure to avoid duplicated work if you have 2 or more windows open. there are 2 http topics you can listen to, as specified in the observer notifications page: topic description http-on-modify-r...
...they are window-independent, so it is better to keep your observer code in non-chrome objects (your xpcom service or jsm module). otherwise you have to make sure to avoid duplicated work if you have 2 or more windows open. there are 2 http topics you can listen to, as specified in the observer notifications page: topic description http-on-modify-request called as an http request is made. the channel is available to allow you to modify headers and such. http-on-examine-response called after a response has been received from the webserver. headers are available on the channel. the subject argument on the observe method is the nsihttpchannel object that corresponds to the http channel being opened or already opened, depending on the topic. observe : func...
...modify headers and such. http-on-examine-response called after a response has been received from the webserver. headers are available on the channel. the subject argument on the observe method is the nsihttpchannel object that corresponds to the http channel being opened or already opened, depending on the topic. observe : function(asubject, atopic, adata) { if (topic_modify_request == atopic) { let url; asubject.queryinterface(components.interfaces.nsihttpchannel); url = asubject.uri.spec; if (re_url_to_modify.test(url)) { // re_url_to_modify is a regular expression. asubject.setrequestheader("referer", "http://example.com", false); } else if (re_url_to_cancel.test(url)) { // re_url_to_cancel is a regular expression. asubject.cancel(compone...
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L20n Javascript API
you can listen to the ready event (emitted by the context instance when all the resources have been compiled) and use ctx.getsync and ctx.getentitysync to get translations synchronously. alternatively, you can register callbacks to execute when the context is ready (or when globals change and translations need to be updated) with ctx.localize. ...
...ppended to it if it is not already present) will be used to negotiate the fallback chain for the user. ctx.registerlocalenegotiator(negotiator: function) register a function which will be used to negotiate the locales supported by the context instance. if you don't call this function, l20n will use the built-in intl.prioritizelocales negotiator. ...
...iate the fallback chain for the user. ctx.registerlocalenegotiator(negotiator: function) register a function which will be used to negotiate the locales supported by the context instance. if you don't call this function, l20n will use the built-in intl.prioritizelocales negotiator. ctx.registerlocalenegotiator(function(available, requested, deflocale) { return intl.prioritizelocales(available, requested, deflocale); }); negotiator is a function which takes the following arguments: available - all locales available to the context instance, requested - locales preferred by the user, deflocale - the default locale to be used as the ultimate fallback, callback - the function to call when the negotiation completes (useful for asynchronous negotiators). it must return an array which is the...
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HTTP delegation
there are two possible solutions to this limitation. instead of improving the simple http client in nss, the nss team has decided to provide an nss api to register application callback functions. if provided by the application, nss will use the registered http client for querying an oscp responder. ...
...appear in nss version 3.11.1. more details can be found in bug 152426. in order to use the http delegation feature in your nss-based application, you need to implement several callback functions. your callback functions might be a full implementation of a http client. or you might choose to leverage an existing http client library and implement the callback functions as a thin layer that forwards requests from nss to the http client library. to learn about all the details, please read the documentation contained in the nss c header files. look for function sec_registerdefaulthttpclient and all functions having names that start with sec_http. to find an example implementation, you may look at bug 111384, which tracks the implementation in mozilla client applications. specifying an ocsp proxy the r...
...ng an ocsp proxy the remainder of this document is a short howto. one might expect the api defines a simple function that accepts the uri and data to be sent, and returns the result data. but there is no such simple interface. the api should allow nss to use the http client either asynchronously or synchronously. in addition, during an application session with ocsp enabled, a large number of ocsp requests might have to be sent. therefore the api should allow for keep-alive (persistent) http connections. http uris consist of host:port and a path, e.g. http://ocsp.provider.com:80/cgi-bin/ocsp-responder if nss needs to access a http server, it will request that an "http server session object" be created (sec_httpserver_createsessionfcn). the http server session object is logically associated with ho...
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HTTP delegation
there are two possible solutions to this limitation. instead of improving the simple http client in nss, the nss team has decided to provide an nss api to register application callback functions. if provided by the application, nss will use the registered http client for querying an oscp responder. ...
...appear in nss version 3.11.1. more details can be found in bug 152426. in order to use the http delegation feature in your nss-based application, you need to implement several callback functions. your callback functions might be a full implementation of a http client. or you might choose to leverage an existing http client library and implement the callback functions as a thin layer that forwards requests from nss to the http client library. to learn about all the details, please read the documentation contained in the nss c header files. look for function sec_registerdefaulthttpclient and all functions having names that start with sec_http. to find an example implementation, you may look at bug 111384, which tracks the implementation in mozilla client applications. specifying an ocsp proxy the r...
...ng an ocsp proxy the remainder of this document is a short howto. one might expect the api defines a simple function that accepts the uri and data to be sent, and returns the result data. but there is no such simple interface. the api should allow nss to use the http client either asynchronously or synchronously. in addition, during an application session with ocsp enabled, a large number of ocsp requests might have to be sent. therefore the api should allow for keep-alive (persistent) http connections. http uris consist of host:port and a path, e.g. http://ocsp.provider.com:80/cgi-bin/ocsp-responder if nss needs to access a http server, it will request that an "http server session object" be created (sec_httpserver_createsessionfcn). the http server session object is logically associated with ho...
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NSS Tools certutil
ercase. option arguments modify an action and are lowercase. certificate database tool command options and their arguments are defined as follows: options -n create new certificate and key databases. -s create an individual certificate and add it to a certificate database. -r create a certificate-request file that can be submitted to a certificate authority (ca) for processing into a finished certificate. output defaults to standard out unless you use -ooutput-file argument. use the -a argument to specify ascii output. -c create a new binary certificate file from a binary certificate-request file. use the -i argument to specify the certificate-request file. if this a...
... arguments used by the certificate database tool. -w change the password to a key database. -u list all available modules or print a single named module. arguments -a use ascii format or allow the use of ascii format for input or output. this formatting follows rfc 1113. for certificate requests, ascii output defaults to standard output unless redirected. -b validity-time specify a time at which a certificate is required to be valid. use when checking certificate validity with the -v option. the format of thevalidity-time argument is "yymmddhhmmss[+hhmm|-hhmm|z]". specifying seconds (ss) is optional. when specifying an explicit time, use "yymmddhhmmssz". wh...
... on. unless specified otherwise the default token is an internal slot (specifically, internal slot 2). this slot can also be explicitly named with the string "internal". an internal slots is a virtual slot maintained in software, rather than a hardware device. internal slot 2 is used by key and certificate services. internal slot 1 is used by cryptographic services. -i cert|cert-request-file specify a specific certificate, or a certificate-request file. -k rsa|dsa|all specify the type of a key: rsa, dsa or both. the default value is rsa. by specifying the type of key you can avoid mistakes caused by duplicate nicknames. -l display detailed information when validating a certificate with the -v option. ...
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nsIUpdateCheckListener
vice.idlscriptable an interface describing an object that listens to the progress of an update check operation. this object is notified as the check continues, finishes and if it has an error. ...
...scriptable an interface describing an object that listens to the progress of an update check operation. this object is notified as the check continues, finishes and if it has an error. ...
... notified as the check continues, finishes and if it has an error. ...
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BaseAudioContext.decodeAudioData() - Web APIs
the decoded audiobuffer is resampled to the audiocontext's sampling rate, then passed to a callback or promise. this is the preferred method of creating an audio source for web audio api from an audio track. this method only works on complete file data, not fragments of audio file data. ...
...is method only works on complete file data, not fragments of audio file data. syntax older callback syntax: baseaudiocontext.decodeaudiodata(arraybuffer, successcallback, errorcallback); newer promise-based syntax: promise<decodeddata> baseaudiocontext.decodeaudiodata(arraybuffer); parameters arraybuffer an arraybuffer containing the audio data to be decoded, usually grabbed from xmlhttprequest, windoworworkerglobalscope.fetch() or filereader. successcallback a callback function to be invoked when the decoding successfully finishes. the single argument to this callback is an audiobuffer representing the decodeddata (the decoded pcm audio data). usually you'll want to put the decoded data into an audiobuffersourcenode, from which it can be played and manipulated how you want. errorcal...
...k, to be invoked if an error occurs when the audio data is being decoded. return value void, or a promise object that fulfills with the decodeddata. example in this section we will first cover the older callback-based system and then the newer promise-based syntax. older callback syntax in this example, the getdata() function uses xhr to load an audio track, setting the responsetype of the request to arraybuffer so that it returns an array buffer as its response that we then store in the audiodata variable . we then pass this buffer into a decodeaudiodata() function; the success callback takes the successfully decoded pcm data, puts it into an audiobuffersourcenode created using audiocontext.createbuffersource(), connects the source to the audiocontext.destination and sets it to loop. the...
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Cache.put() - Web APIs
the put() method of the cache interface allows key/value pairs to be added to the current cache object. often, you will just want to fetch() one or more requests, then add the result straight to your cache. in such cases you are better off using cache.add()/cache.addall(), as they are shorthand functions for one or more of these operations. fetch(url).then(function(response) { if (!response.ok) { throw new typeerror('bad response status'); } return cache.put(url, response); }) note: put() will overwrite any key/value pair previously stored in the cache that matches the request. note: cache.add/cache.addall do not cache responses with response.status values that are not in the 200 range, whereas cache.put lets you store any request/response pair. as a result, cache.add/cache.ad...
... return value a promise that resolves with undefined. ...
... return value a promise that resolves with undefined. note: the promise will reject with a typeerror if the url scheme is not http or https. ...
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Cache - Web APIs
use cachestorage.open() to open a specific named cache object and then call any of the cache methods to maintain the cache. ...
...e that the cache interface is exposed to windowed scopes as well as workers. you don't have to use it in conjunction with service workers, even though it is defined in the service worker spec. an origin can have multiple, named cache objects. you are responsible for implementing how your script (e.g. in a serviceworker) handles cache updates. items in a cache do not get updated unless explicitly requested; they don’t expire unless deleted. use cachestorage.open() to open a specific named cache object and then call any of the cache methods to maintain the cache. you are also responsible for periodically purging cache entries. each browser has a hard limit on the amount of cache storage that a given origin can use. cache quota usage estimates are available via the storageestimate api. the brows...
...n caches by name and use the caches only from the version of the script that they can safely operate on. see deleting old caches for more information. note: the key matching algorithm depends on the vary header in the value. so matching a new key requires looking at both key and value for entries in the cache. note: the caching api doesn't honor http caching headers. methods cache.match(request, options) returns a promise that resolves to the response associated with the first matching request in the cache object. cache.matchall(request, options) returns a promise that resolves to an array of all matching requests in the cache object. cache.add(request) takes a url, retrieves it and adds the resulting response object to the given cache. this is functionally equivalent to calling fe...
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Basic animations - Web APIs
ircumstances, we only see these results appear on the canvas when the script finishes executing. for instance, it isn't possible to do an animation from within a for loop. that means we need a way to execute our drawing functions over a period of time. there are two ways to control an animation like this. ...
... if you don't want any user interaction you can use the setinterval() function which repeatedly executes the supplied code. ...
...() functions, which can be used to call a specific function over a set period of time. setinterval(function, delay) starts repeatedly executing the function specified by function every delay milliseconds. settimeout(function, delay) executes the function specified by function in delay milliseconds. requestanimationframe(callback) tells the browser that you wish to perform an animation and requests that the browser call a specified function to update an animation before the next repaint. if you don't want any user interaction you can use the setinterval() function which repeatedly executes the supplied code. if we wanted to make a game, we could use keyboard or mouse events to control the animation and use settimeout(). by setting eventlisteners, we catch any user interaction and execute...
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Using FormData Objects - Web APIs
it is primarily intended for use in sending form data, but can be used independently from forms in order to transmit keyed data. the transmitted data is in the same format that the form's submit() method would use to send the data if the form's encoding type were set to multipart/form-data. ...
...ta.append("accountnum", 123456); // number 123456 is immediately converted to a string "123456" // html file input, chosen by user formdata.append("userfile", fileinputelement.files[0]); // javascript file-like object var content = '<a id="a"><b id="b">hey!</b></a>'; // the body of the new file... var blob = new blob([content], { type: "text/xml"}); formdata.append("webmasterfile", blob); var request = new xmlhttprequest(); request.open("post", "http://foo.com/submitform.php"); request.send(formdata); note: the fields "userfile" and "webmasterfile" both contain a file. the number assigned to the field "accountnum" is immediately converted into a string by the formdata.append() method (the field's value can be a blob, file, or a string: if the value is neither a blob nor a file, the value is...
...umber assigned to the field "accountnum" is immediately converted into a string by the formdata.append() method (the field's value can be a blob, file, or a string: if the value is neither a blob nor a file, the value is converted to a string). this example builds a formdata instance containing values for fields named "username", "accountnum", "userfile" and "webmasterfile", then uses the xmlhttprequest method send() to send the form's data. the field "webmasterfile" is a blob. a blob object represents a file-like object of immutable, raw data. blobs represent data that isn't necessarily in a javascript-native format. the file interface is based on blob, inheriting blob functionality and expanding it to support files on the user's system. in order to build a blob you can invoke the blob() constr...
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IDBObjectStore.clear() - Web APIs
the clear() method of the idbobjectstore interface creates and immediately returns an idbrequest object, and clears this object store in a separate thread. this is for deleting all the current data out of an object store. clearing an object store consists of removing all records from the object store and removing all records in indexes that reference the object store. to remove only some of the records in a store, use idbobjectstore.delete passing a key or idbkeyrange. note: this feature is available in web workers. syntax var request = objectstore.clear(); returns an idbrequest object on which subsequent events related to this operation are fired. exceptions this method may raise a domexception of one of the following types: exception description readonlyerro...
...n is in read-only mode. transactioninactiveerror this idbobjectstore's transaction is inactive. example in the following code snippet, we open a read/write transaction on our database and clear all the current data out of the object store using clear(). ...
...or this idbobjectstore's transaction is inactive. example in the following code snippet, we open a read/write transaction on our database and clear all the current data out of the object store using clear(). ...
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Window.open() - Web APIs
en window.open() returns, the window always contains about:blank. the actual fetching of the url is deferred and starts after the current script block finishes executing. the window creation and the loading of the referenced resource are done asynchronously. ...
... executing. the window creation and the loading of the referenced resource are done asynchronously. examples var windowobjectreference; var windowfeatures = "menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes"; function openrequestedpopup() { windowobjectreference = window.open("http://www.cnn.com/", "cnn_windowname", windowfeatures); } var windowobjectreference; function openrequestedpopup() { windowobjectreference = window.open( "http://www.domainname.ext/path/imagefile.png", "descriptivewindowname", "resizable,scrollbars,status" ); } if a window with the name already exists, then url is loaded into the existing window. in this case the return value of the method is the existing window and windowfeatures is ignored. providing an empty string for url is a wa...
... function is the lonely key to get back the handle on a window if the developer has access only to its name (the name can be saved with cookies or local storage but not the window object handle). for now 10/01/2017 the differencies of behavior found recently have not still been tested for others browsers. window features windowfeatures is an optional string containing a comma-separated list of requested features of the new window. after a window is opened, javascript can't be used to change the features. if windowname does not specify an existing window and the windowfeatures parameter is not provided (or if the windowfeatures parameter is an empty string), then the new secondary window will render the default toolbars of the main window. tip: note that in some browsers, users can override t...
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HTTP caching - HTTP
f web sites and applications can be significantly improved by reusing previously fetched resources. web caches reduce latency and network traffic and thus lessen the time needed to display a representation of a resource. by making use of http caching, web sites become more responsive. different kinds of caches caching is a technique that stores a copy of a given resource and serves it back when requested. when a web cache has a requested resource in its store, it intercepts the request and returns its copy instead of re-downloading from the originating server. this achieves several goals: it eases the load of the server that doesn’t need to serve all clients itself, and it improves performance by being closer to the client, i.e., it takes less time to transmit the resource back. for a web sit...
...local network infrastructure to serve many users so that popular resources are reused a number of times, reducing network traffic and latency. targets of caching operations http caching is optional, but reusing a cached resource is usually desirable. however, common http caches are typically limited to caching responses to get and may decline other methods. the primary cache key consists of the request method and target uri (oftentimes only the uri is used as only get requests are caching targets). common forms of caching entries are: successful results of a retrieval request: a 200 (ok) response to a get request containing a resource like html documents, images or files. permanent redirects: a 301 (moved permanently) response. error responses: a 404 (not found) result page. incomplete re...
...a resource like html documents, images or files. permanent redirects: a 301 (moved permanently) response. error responses: a 404 (not found) result page. incomplete results: a 206 (partial content) response. responses other than get if something suitable for use as a cache key is defined. a cache entry might also consist of multiple stored responses differentiated by a secondary key, if the request is target of content negotiation. for more details see the information about the vary header below. controlling caching the cache-control header the cache-control http/1.1 general-header field is used to specify directives for caching mechanisms in both requests and responses. use this header to define your caching policies with the variety of directives it provides. no caching the cache sho...
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Caching compiled WebAssembly modules - WebAssembly
storename = 'wasm-cache'; setting up the database the first helper function contained inside instantiatecachedurl() — opendatabase() — creates an object store for storing wasm modules, and also handles clearing out the database if the dbversion is updated; it returns a promise resolving to the new database. ...
... the first helper function contained inside instantiatecachedurl() — opendatabase() — creates an object store for storing wasm modules, and also handles clearing out the database if the dbversion is updated; it returns a promise resolving to the new database. ...
...ase() — creates an object store for storing wasm modules, and also handles clearing out the database if the dbversion is updated; it returns a promise resolving to the new database. ...
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Finding window handles - Archive of obsolete content
e the top level nsibasewindow as a param, null will be returned in the chain and cause crash of firefox, that's a bug of firefox.(https://bugzilla.mozilla.org/show_bug.cgi?id=489045) now, let's move forward. first, in javascript, the code gets the nsibasewindow we want, it's a direct child of the top nsibasewindow. ...
...rect child of the top nsibasewindow. ...
...r what desktop/window manager) is in use, for explanation why see the article: standard os libraries - unix section) windows components.utils.import('resource://gre/modules/services.jsm'); var browserwindow = services.wm.getmostrecentwindow('navigator:browser'); if (!browserwindow) { throw new error('no browser window found'); } var basewindow = browserwindow.queryinterface(ci.nsiinterfacerequestor) .getinterface(ci.nsiwebnavigation) .queryinterface(ci.nsidocshelltreeitem) .treeowner .queryinterface(ci.nsiinterfacerequestor) .getinterface(ci.nsibasewindow); var hwndstring = basewindow.nativehandle; components.utils.import('resource://gre/m...
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New Security Model for Web Services - Archive of obsolete content
this should especially be implemented for soap calls by untrusted scripts. when an attempt is made to access a resource at a previously-unknown uri, the sandbox reads a file at that domain with declarations to determine whether access is permitted to the script. if the file is not there, access is denied. the problem external untrusted scripts loaded behind a firewall are executed in a sandbox. ...
...hich is the resource and server owner -- not the user -- to determine whether a resource should be insulated from web applications loaded from outside of the firewall. using a soap header for verification soap messages have a distinct processing model allowing a header to be added that the recipient is required to understand and accept, which identifies the untrusted source of a script making a request. ...
...insulated from web applications loaded from outside of the firewall. using a soap header for verification soap messages have a distinct processing model allowing a header to be added that the recipient is required to understand and accept, which identifies the untrusted source of a script making a request. soap services which have not been cleared for access by untrusted scripts will reject the requests. this is offered in the mozilla implementation of soap today. unfortunately, this does not prevent soap messages from being sent to non-soap addresses, which is a big enough problem that the verification cannot stand alone to guarantee that untrusted service requests are always properly rejected by services that should be firewall-protected. it may also be inconvenient to modify a soap service...
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Introduction to Public-Key Cryptography - Archive of obsolete content
rtificate system). the methods used to validate an identity vary depending on the policies of a given ca-just as the methods to validate other forms of identification vary depending on who is issuing the id and the purpose for which it will be used. in general, before issuing a certificate, the ca must use its published verification procedures for that type of certificate to ensure that an entity requesting a certificate is in fact who it claims to be. the certificate issued by the ca binds a particular public key to the name of the entity the certificate identifies (such as the name of an employee or a server). certificates help prevent the use of fake public keys for impersonation. only the public key certified by the certificate will work with the corresponding private key possessed by the en...
...key cryptography to validate the signature and confirm the validity of the certificate. password-based authentication figure 4 shows the basic steps involved in authenticating a client by means of a name and password. figure 4 assumes the following: the user has already decided to trust the server, either without authentication or on the basis of server authentication via ssl. the user has requested a resource controlled by the server. the server requires client authentication before permitting access to the requested resource. these are the steps shown in figure 4: in response to an authentication request from the server, the client displays a dialog box requesting the user's name and password for that server. the user must supply a name and password separately for each new server...
...ver the user wishes to use during a work session. the client sends the name and password across the network, either in the clear or over an encrypted ssl connection. the server looks up the name and password in its local password database and, if they match, accepts them as evidence authenticating the user's identity. the server determines whether the identified user is permitted to access the requested resource, and if so allows the client to access it. with this arrangement, the user must supply a new password for each server, and the administrator must keep track of the name and password for each user, typically on separate servers. proper implementation does not store passwords in plaintext. instead it concatenates the password with a random per-user value (so called "salt") and stores ...
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Choosing the right approach - Learn web development
ith the result. this is the precursor to promises; it's not as efficient or flexible. use only when necessary. useful for... ...
... useful for... ...
... compatibility unknownsee implementation notes.see implementation notes. further information cooperative asynchronous javascript: timeouts and intervals, in particular settimeout() settimeout() reference setinterval() setinterval() is a method that allows you to run a function repeatedly with a set interval of time between each execution. not as efficient as requestanimationframe(), but allows you to choose a running rate/frame rate. useful for... single delayed operation repeating operation multiple sequential operations multiple simultaneous operations no yes no (unless it is the same one) no code example the following function creates a new date() object, extracts a time string out of it using tolocaletimestri...
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Experimental features in Firefox
7233 for more details. release channel version added enabled by default? nightly 33 no developer edition 33 no beta 33 no release 33 no preference name media.track.enabled dom document property: autoplaypolicy the document property autoplaypolicy returns a string indicating how the browser handles requests to automatically play media (either using the autoplay property on a media element or by attempting to trigger playback from javascript code. the spec for this api is still being written. the value changes over time depending on what the user is doing, their preferences, and the state of the browser in general. potential values include allowed (autoplay is currently permitted), allowed-muted (au...
...s method getboxquads() returns the css boxes for a node relative to any other node or viewport. see bug 917755 for more details. release channel version added enabled by default? nightly 31 yes developer edition 31 no beta 31 no release 31 no preference name layout.css.convertfromnode.enable payment request api primary payment handling the payment request api provides support for handling web-based payments within web content or apps. due to a bug that came up during testing of the user interface, we have decided to postpone shipping this api while discussions over potential changes to the api are held. work is ongoing. see bug 1318984 for more details on the state of this api. release c...
... postpone shipping this api while discussions over potential changes to the api are held. work is ongoing. see bug 1318984 for more details on the state of this api. release channel version added enabled by default? nightly 55 no developer edition 55 no beta 55 no release 55 no preference name dom.payments.request.enabled and dom.payments.request.supportedregions basic card api extends the payment request api with dictionaries that define data structures describing card payment types and payment responses. see basiccardrequest and basiccardresponse. release channel version added enabled by default? nightly 56 no developer edition 56 no ...
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Performance best practices for Firefox front-end engineers
that thread can respond to user events, paint, and generally be responsive to the user. you might want to consider using a worker if you need to do some computation that can be done off of the main thread. if you need more elevated privileges than a standard worker allows, consider using a chromeworker, which is a firefox-only api which lets you create workers with more elevated privileges. ...
...ard worker allows, consider using a chromeworker, which is a firefox-only api which lets you create workers with more elevated privileges. use requestidlecallback() if you simply cannot avoid doing some kind of long job on the main thread, try to break it up into smaller pieces that you can run when the browser has a free moment to spare, and the user isn't doing anything. you can do that using requestidlecallback() and the cooperative scheduling of background tasks api, and doing it only when we have a free second where presumably the user isn’t doing something. see also the blog post collective scheduling with requestidlecallback. as of bug 1353206, you can also schedule idle events in non-dom contexts by using services.tm.idledispatchtomainthread. see the nsithreadmanager.idl file for mo...
... creative commons attribution 3.0, courtesy of this page from our friends at google, which itself is well worth the read. for a very down-to-earth explanation of the style, layout, paint and composite steps of the pipeline, this hacks blog post does a great job of explaining it. to achieve a 60 fps frame rate, all of the above has to happen in 16 milliseconds or less, every frame. note that requestanimationframe() lets you queue up javascript to run right before the style flush occurs. this allows you to put all of your dom writes (most importantly, anything that could change the size or position of things in the dom) just before the style and layout steps of the pipeline, combining all the style and layout calculations into a single batch so it all happens once, in a single frame tick, ins...
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Necko walkthrough
m with uri to ... nsdocshell::internalload nsdocshell::douriload opens the nsichannel for the uri (ns_newchannel) if "http:", it will be an nsihttpchannel nsdocshell::dochannelload nsuriloader::openuri passes an nsistreamlistener pointer, 'loader' to nsuriloader::openchannel - it creates an nsdocumentopeninfo object, which implements nsistreamlistener, i.e. ...
..... nsdocshell::internalload nsdocshell::douriload opens the nsichannel for the uri (ns_newchannel) if "http:", it will be an nsihttpchannel nsdocshell::dochannelload nsuriloader::openuri passes an nsistreamlistener pointer, 'loader' to nsuriloader::openchannel - it creates an nsdocumentopeninfo object, which implements nsistreamlistener, i.e. ...
...tartrequest, onstoprequest, ondataavailable, the three functions in which channel responses are received asynchronously. nshttpchannel::asyncopen called from openuri; openchannel isn't named the best, since the opening happens in the context of openuri, its calling function. this is where it hits necko code. but the interface for clients of necko is important to consider: send request uri helps creates channel setup channel (headers, request data, response callback...) channel->asyncopen. ...
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nsIParentalControlsService
1.0 66 introduced gecko 1.9 inherits from: nsisupports last changed in gecko 1.9 (firefox 3) note: currently, this interface is only supported on microsoft windows vista and newer as well as android 4.3 and newer. ...
...lla.org/parental-controls-service;1. ...
...read only. loggingenabled boolean ...
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nsISmsDatabaseService
= components.classes["@mozilla.org/sms/smsdatabaseservice;1"] .createinstance(components.interfaces.nsismsdatabaseservice); method overview long savereceivedmessage(in domstring asender, in domstring abody, in unsigned long long adate); long savesentmessage(in domstring areceiver, in domstring abody, in unsigned long long adate); void getmessage(in long messageid, in long requestid, [optional] in unsigned long long processid); void deletemessage(in long messageid, in long requestid, [optional] in unsigned long long processid); void createmessagelist(in nsidommozsmsfilter filter, in boolean reverse, in long requestid, [optional] in unsigned long long processid); void getnextmessageinlist(in long listid, in long requestid, [optional] in unsigned long long processid); ...
...optional] in unsigned long long processid); void createmessagelist(in nsidommozsmsfilter filter, in boolean reverse, in long requestid, [optional] in unsigned long long processid); void getnextmessageinlist(in long listid, in long requestid, [optional] in unsigned long long processid); void clearmessagelist(in long listid); void markmessageread(in long messageid, in boolean value, in long requestid, [optional] in unsigned long long processid) methods savereceivedmessage() void savereceivedmessage( in domstring asender, in domstring abody, in unsigned long long adate ); parameters asender a domstring with the sender of the text message. abody a domstring containing the body text of the message. adate the timestamp of the message. savesentmessage() void savesentmessage( in do...
... message. adate the timestamp of the message. savesentmessage() void savesentmessage( in domstring a receiver, in domstring abody, in unsigned long long adate ); parameters areceiver a domstring with the receiver of the text message. abody a domstring containing the body text of the message. adate the timestamp of the message. ...
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Cache.keys() - Web APIs
options optional an object whose properties control how matching is done in the keys operation. ...
... options optional an object whose properties control how matching is done in the keys operation. ...
... options optional an object whose properties control how matching is done in the keys operation. ...
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Advanced animations - Web APIs
, this.y, this.radius, 0, math.pi * 2, true); ctx.closepath(); ctx.fillstyle = this.color; ctx.fill(); } }; ball.draw(); nothing special here, the ball is actually a simple circle and gets drawn with the help of the arc() method. adding velocity now that we have a ball, we are ready to add a basic animation like we have learned in the last chapter of this tutorial. again, window.requestanimationframe() helps us to control the animation. the ball gets moving by adding a velocity vector to the position. for each frame, we also clear the canvas to remove old circles from prior frames. var canvas = document.getelementbyid('canvas'); var ctx = canvas.getcontext('2d'); var raf; var ball = { x: 100, y: 100, vx: 5, vy: 2, radius: 25, color: 'blue', draw: function() { ...
...we need to check if the x and y position of the ball is out of the canvas dim...
...we need to check if the x and y position of the ball is out of the canvas dimensions and invert the direction of the velocity vectors. to do so, we add the following checks to...
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IDBFactory.open() - Web APIs
the open() method of the idbfactory interface requests opening a connection to a database. the method returns an idbopendbrequest object immediately, and performs the open operation asynchronously. if the operation is successful, a success event is fired on the request object that is returned from this method, with its result attribute set to the new idbdatabase object for the connection. if an error occurs while the database connection is being opened, then an error event is fired on the request object returned from this method. may trigger upgradeneeded, blocked or versionchange events. note: this feature is available in web workers. ...
... version optional optional. the version to open the database with. ...
... version optional optional. the version to open the database with. ...
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IDBIndex.count() - Web APIs
exceptions this method may raise a domexception of one of the following types: exception description transactioninactiveerror this idbindex's transaction is inactive. ...
... exceptions this method may raise a domexception of one of the following types: exception description transactioninactiveerror this idbindex's transaction is inactive. ...
... exceptions this method may raise a domexception of one of the following types: exception description transactioninactiveerror this idbindex's transaction is inactive. ...
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IDBObjectStore.put() - Web APIs
the put() method of the idbobjectstore interface updates a given record in a database, or inserts a new record if the given item does not already exist. it returns an idbrequest object, and, in a separate thread, creates a structured clone of the value and stores the cloned value in the object store. this is for adding new records, or updating existing records in an object store when the transaction's mode is readwrite. if the record is successfully stored, then a success event is fired on the returned request object with the result set to the key for the stored record, and the transaction set to the transaction in which this object store is opened. the put method is an update or insert method. see the idbobjectstore.add method for an insert only method. bear in mind that if you have a idbc...
...nsert method. see the idbobjectstore.add method for an insert only method. bear in mind that if you have a idbcursor to the record you want to update, updating it with idbcursor.update() is preferable to using idbobjectstore.put(). doing so makes it clear that an existing record will be updated, instead of a new record being inserted. note: this feature is available in web workers. syntax let request = objectstore.put(item); let request = objectstore.put(item, key); parameters item the item you wish to update (or insert). key optional the primary key of the record you want to update (e.g. from idbcursor.primarykey). this is only needed for object stores that have an autoincrement primary key, therefore the key is not in a field on the record object. in such cases, calling put(item) wil...
...sert). key optional the primary key of the record you want to update (e.g. from idbcursor.primarykey). this is only needed for object stores that have an autoincrement primary key, therefore the key is not in a field on the record object. in such cases, calling put(item) will always insert a new record, because it doesn't know what existing record you might want to modify. return value an idbrequest object on which subsequent events related to this operation are fired. exceptions this method may raise a domexception of one of the following types: exception description readonlyerror the transaction associated with this operation is in read-only mode. transactioninactiveerror this idbobjectstore's transaction is inactive. dataerror an...
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IDBTransaction.objectStore() - Web APIs
added to the scope of this transaction. every call to this method on the same transaction object, with the same name, returns the same idbobjectstore instance. if this method is called on a different transaction object, a different idbobjectstore instance is returned. note: this feature is available in web workers. ...
...re instance is returned. note: this feature is available in web workers. syntax idbtransaction.objectstore(name); parameters name the name of the requested object store. return value an idbobjectstore object for accessing an object store. exceptions this method may raise a domexception of one of the following types: exception description notfounderror the requested object store is not in this transaction's scope. invalidstateerror the request was made on a source object that has been deleted or removed, or if the transaction has finished. example in the following code snippet, we open a read/write transaction on our database and add some data to an object store. note also the functions attached to transaction event handlers to report o...
... example in the following code snippet, we open a read/write transaction on our database and add some data to an object store. note also the functions attached to transaction event handlers to report on the outcome of the transaction opening in the event of success or failure. ...
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PaymentAddress - Web APIs
it may be useful to refer to the universal postal union web site's addressing s42 standard materials, which provide information about international standards for postal addresses. properties paymentaddress.addressline read only an array of domstring objects providing each line of the address not included among the other properties. the exact size and content varies by country or location and can include, for example, a street name, house number, apartment number, rural delivery route, descriptive instructions, or post office box number. ...
...anguagecode read only a domstring indicating the language code of the address. this identifies the language in which the address is given, and is intended to aid in localization of the display of the address. methods paymentaddress.tojson() a standard serializer that returns a json representation of the paymentaddress object's properties. examples in the following example, the paymentrequest() constructor is used to create a new payment request, which takes three objects as parameters — one containing details of the payment methods that can be used for the payment, one containing details of the actual order (such as items bought and shipping options), and an optional object containing further options. the first of these three (supportedinstruments in the example below) contains a ...
...bjects as parameters — one containing details of the payment methods that can be used for the payment, one containing details of the actual order (such as items bought and shipping options), and an optional object containing further options. the first of these three (supportedinstruments in the example below) contains a data property that has to conform to the structure defined by the basiccardrequest dictionary. const supportedinstruments = [ { supportedmethods: "basic-card", }, ]; const details = { total: { label: "donation", amount: { currency: "usd", value: "65.00" } }, displayitems: [ { label: "original donation amount", amount: { currency: "usd", value: "65.00" }, }, ], shippingoptions: [ { id: "standard", label: "standard shipping", ...
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RTCIceCandidatePairStats - Web APIs
ircuit breaker is triggered whenever a connection times out or otherwise needs to be automatically aborted. consentexpiredtimestamp optional a domhighrestimestamp value indicating the time at which the most recent stun binding response expired. this value is undefined if no valid stun binding responses have been sent on the candidate pair; this can only happen if responsesreceived is 0. consentrequestssent optional the total number of consent requests that have been sent on this candidate pair. currentroundtriptime optional a floating-point value indicating the total time, in seconds, that elapsed elapsed between the most recently-sent stun request and the response being received. this may be based upon requests that were involved in confirming permission to open the connection. firstreque...
...urrentroundtriptime optional a floating-point value indicating the total time, in seconds, that elapsed elapsed between the most recently-sent stun request and the response being received. this may be based upon requests that were involved in confirming permission to open the connection. firstrequesttimestamp optional a domhighrestimestamp value which specifies the time at which the first stun request was sent from the local peer to the remote peer for this candidate pair. lastpacketreceivedtimestamp optional a domhighrestimestamp value indicating the time at which the last packet was received by the local peer from the remote peer for this candidate pair. timestamps are not recorded for stun packets. lastpacketsenttimestamp optional a domhighrestimestamp value indicating the time at which...
...indicating the time at which the last packet was received by the local peer from the remote peer for this candidate pair. timestamps are not recorded for stun packets. lastpacketsenttimestamp optional a domhighrestimestamp value indicating the time at which the last packet was sent from the local peer to the remote peer for this candidate pair. timestamps are not recorded for stun packets. lastrequesttimestamp optional a domhighrestimestamp value which specifies the time at which the last (most recent) stun request was sent from the local peer to the remote peer for this candidate pair. lastresponsetimestamp optional a domhighrestimestamp value that specifies the time at which the last (most recent) stun response was received by the local candidate from the remote candidate in this pair. l...
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Screen Wake Lock API - Web APIs
ents can acquire the screen wake lock. there are plenty of use cases for keeping a screen on, including reading an ebook, map navigation, following a recipe, presenting to an audience, scanning a qr/barcode or applications that use voice or gesture control, rather than tactile input (the default way to keep a screen awake). you acquire a wakelocksentinel object by calling the navigator.wakelock.request() promise based method that resolves if the platform allows it. a request may be rejected for a number of reasons, including system settings (such as power save mode or low battery level) or if the document is not active or visible. the sentinel is attached to the underlying system wake lock. it can be released by the system, again if the battery power is too low or the document is not active or...
...ctive and a way for the user to disable it if they wish. screen wake lock api interfaces wakelock the wakelock interface prevents device screens from dimming or locking when an application needs to keep running. wakelocksentinel provides a handle to the underlying platform wake lock and if referenced can be manually released and reacquired. get an instance of the object by calling wakelock.request. navigator.wakelock returns a wakelock object instance, from which all other functionality can be accessed. examples feature detection this code checks for wake lock support and updates the ui accordingly. if ('wakelock' in navigator) { issupported = true; statuselem.textcontent = 'screen wake lock api supported!'; } else { wakebutton.disabled = true; statuselem.textcontent = 'wake...
...ct instance, from which all other functionality can be accessed. examples feature detection this code checks for wake lock support and updates the ui accordingly. ...
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WebXR permissions and security - Web APIs
ions it needs to provide a secure and private xr experience. introduction the webxr device api is subject to a number of permission and security controls. while not onerous, they are worth being aware of. these mostly revolve around the fully-immersive immersive-vr session mode, but there are things to be aware of when setting up an ar session, as well. ...
...bxr device api is subject to a number of permission and security controls. while not onerous, they are worth being aware of. these mostly revolve around the fully-immersive immersive-vr session mode, but there are things to be aware of when setting up an ar session, as well. immersive presentation of vr first, any requests to activate the immersive-vr mode are rejected if the domain issuing the request does not have permission to enable an immersive session. this permission comes from the xr-spatial-tracking feature policy. once that check is passed, the request to enter immersive-vr mode is allowed if all of the following are true: the requestsession() call was issued by code executing within the handler for a user event, or the from the startup code for a user-launched web application. t...
... call was issued by code executing within the handler for a user event, or the from the startup code for a user-launched web application. the document is considered trustworthy, in that it is responsible and is both currently active and has focus. the user's intent to enter immersive vr mode is well understood; see user intent below for details. ...
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Sending and Receiving Binary Data - Web APIs
receiving binary data using javascript typed arrays the responsetype property of the xmlhttprequest object can be set to change the expected response type from the server. possible values are the empty string (default), "arraybuffer", "blob", "document", "json", and "text". the response property will contain the entity body according to responsetype, as an arraybuffer, blob, document, json, or string. this is null if the request is not complete or was not successful. this example reads an image as a binary file and creates an 8-bit unsigned integer array from the raw bytes. note that this will not decode the image and read the pixels. you will need a png decoding library for that. ...
...entity body according to responsetype, as an arraybuffer, blob, document, json, or string. this is null if the request is not complete or was not successful. this example reads an image as a binary file and creates an 8-bit unsigned integer array from the raw bytes. note that this will not decode the image and read the pixels. you will need a png decoding library for that. ...
... var arraybuffer = oreq.response; // note: not oreq.responsetext if (arraybuffer) { var bytearray = new uint8array(arraybuffer); for (var i = 0; i < bytearray.bytelength; i++) { // do something with each byte in the array } } }; oreq.send(null); you can also read a binary file as a blob by setting the string "blob" to the responsetype property. ...
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XRSession - Web APIs
with xrsession methods, you can poll the viewer's position and orientation (the xrviewerpose), gather information about the user's environment, and present imagery to the user. xrsession supports both inline and immersive virtual and augmented reality modes. ...
...f it's being visible but not currently the target for user events. methods xrsession provides the following methods in addition to those inherited from its parent interface, eventtarget. ...
...on to those inherited from its parent interface, eventtarget. cancelanimationframe() removes a callback from the animation frame painting callback from xrsession's set of animation frame rendering callbacks, given the identifying handle returned by a previous call to requestanimationframe(). end() ends the webxr session. returns a promise which resolves when the session has been shut down. ...
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Event reference
using abortcontroller.abort(). svg events svgabort svgerror svgload svgresize svgscroll svgunload svgzoom database events abort blocked complete error success upgradeneeded versionchange script events afterscriptexecute beforescriptexecute menu events dommenuitemactive dommenuiteminactive window events close popup events popuphidden popuphiding popupshowing popu...
...t sent to recipients of the event (so you can find information about what data is provided with each event) as well as a link to the specification or specifications that define the event. event name event type specification fired when... abort uievent dom l3 the loading of a resource has been aborted. abort progressevent progress and xmlhttprequest progression has been terminated (not due to an error). abort event indexeddb a transaction has been aborted. afterprint event html5 the associated document has started printing or the print preview has been closed. animationcancel animationevent css animations a css animation has aborted. animationend animationevent css a...
... ended event html5 media playback has stopped because the end of the media was reached. ended event web audio api playback has stopped because the end of the media was reached. endevent timeevent svg a smil animation element ends. error uievent dom l3 a resource failed to load. error progressevent progress and xmlhttprequest progression has failed. error event websocket a websocket connection has been closed with prejudice (some data couldn't be sent for example). error event server sent events an event source connection has been failed. error event indexeddb a request caused an error and failed. error event web speech api a speech recogniti...
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Connection management in HTTP/1.x - HTTP
rmance of web sites and web applications. in http/1.x, there are several models: short-lived connections, persistent connections, and http pipelining. http mostly relies on tcp for its transport protocol, providing a connection between the client and the server. in its infancy, http used a single model to handle such connections. ...
... connections. these connections were short-lived: a new one created each time a request needed sending, and closed once the answer had been received. this simple model held an innate limitation on performance: opening each tcp connection is a resource-consuming operation. several messages must be exchanged between the client and the server. network latency and bandwidth affect performance when a request needs sending. modern web pages require many requests (a dozen or more) to serve the amount of information needed, proving this earlier model inefficient. two newer models were created in http/1.1. the persistent-connection model keeps connections opened between successive requests, reducing the time needed to open new connections. the http pipelining model goes one step further, by sending seve...
... http/2 adds additional models for connection management. it's important point to note that connection management in http applies to the connection between two consecutive nodes, which is hop-by-hop and not end-to-end. ...
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Making PWAs work offline with Service workers - Progressive web apps (PWAs)
tion between different contexts. you are able to give a service worker something to work on, and receive the result whenever it is ready using a promise-based approach. they can do a lot more than "just" offering offline capabilities, including handling notifications, performing heavy calculations on a separate thread, etc. service workers are quite powerful as they can take control over network requests, modify them, serve custom responses retrieved from the cache, or synthesize responses completely. security because they are so powerful, service workers can only be executed in secure contexts (meaning https). if you want to experiment first before pushing your code to production, you can always test on a localhost or setup github pages — both support https. offline first the "offline fir...
... to finish. caches is a special cachestorage object available in the scope of the given service worker to enable saving data — saving to web storage won't work, because web storage is synchronous. with service workers, we use the cache api instead. here, we open a cache with a given name, then add all the files our app uses to the cache, so they are available next time it loads (identified by request url). activation there is also an activate event, which is used in the same way as install. this event is usually used to delete any files that are no longer necessary and clean up after the app in general. we don't need to do that in our app, so we'll skip it. responding to fetches we also have a fetch event at our disposal, which fires every time an http request is fired off from our app. t...
...nt, which is used in the same way as install. this event is usually used to delete any files that are no longer necessary and clean up after the app in general. we don't need to do that in our app, so we'll skip it. responding to fetches we also have a fetch event at our disposal, which fires every time an http request is fired off from our app. this is very useful, as it allows us to intercept requests and respond to them with custom responses. here is a simple usage example: self.addeventlistener('fetch', (e) => { console.log('[service worker] fetched resource '+e.request.url); }); the response can be anything we want: the requested file, its cached copy, or a piece of javascript code that will do something specific — the possibilities are endless. in our example app, we serve conten...
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HTML to DOM - Archive of obsolete content
however, there are potential dangers involved in injecting remote content in a privileged context in your extension, so it can be desirable to parse the html safely. ...
...however, there are potential dangers involved in injecting remote content in a privileged context in your extension, so it can be desirable to parse the html safely. ...
...ediocre programmer, but people liked him <strong>anyway</strong>.</div>"); alert(dompars.getelementbyid('userinfo').innerhtml); to parse a complete html page, load it into an iframe whose type is content (not chrome). see using a hidden iframe element to parse html to a window's dom below. ...
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Appendix D: Loading Scripts - Archive of obsolete content
"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <script type="application/javascript;version=1.8" src="overlay.js"/> </overlay> evalinsandbox the components.utils.evalinsandbox method may be used to load arbitrary code into components.utils.sandbox objects. javascript files or urls may be loaded in this manner by first retrieving their contents into memory using an xmlhttprequest. this is the method used by jetpack's securable module system to load nearly all executable code. advantages namespacing: since scripts executed via evalinsandbox run in a defined namespace, global namespace contamination and the resultant extension compatibility issues are not usually a problem. flexibility: the evalinsandbox method accepts several parameters, including the url, line number...
...ance: there are several significant performance disadvantages inherent in this method: there is currently no way to load code into sandboxes from a cache. this means that code must be compiled and executed anew each time it is loaded, which has a significant overhead for large code bases. in addition to compile time, reading files synchronously from disk has its own overhead, and xmlhttprequests have significantly more overhead than native loading methods. although wary authors can choose to cache instances of their modules so that modules are loaded only once globally, this method can be easily misused to re-load scripts for each new window where they would be better loaded only once globally per session. because sandbox objects are evaluated in their own javascript compartment, ...
...om a local file in the same directory as the current script. the script will execute in the same security context as the current script and will have access to the same globals, but any new globals it creates will be accessible only to the script itself. objects passed out of the sandbox will not be wrapped in xpcnativewrappers but will still be wrapped in inter-compartment proxies. ...
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Drawing graphics - Learn web development
. if you think of your canvas as being like a movie, you really want the display to update on each frame to show the updated view, with an ideal refresh rate of 60 frames per second so that movement appears nice and smooth to the human eye. there are a few javascript functions that will allow you to run functions repeatedly, several times a second, the best one for our purposes here being window.requestanimationframe(). it takes one parameter — the name of the function you want to run for each frame. the next time the browser is ready to update the screen, your function will get called. if that function draws the new update to your animation, then calls requestanimationframe() again just before the end of the function, the animation loop will continue to run. the loop ends when you stop callin...
...imationframe(). it takes one parameter — the name of the function you want to run for each frame. the next time the browser is ready to update the screen, your function will get called. if that function draws the new update to your animation, then calls requestanimationframe() again just before the end of the function, the animation loop will continue to run. the loop ends when you stop calling requestanimationframe() or if you call window.cancelanimationframe() after calling requestanimationframe() but before the frame is called. note: it's good practice to call cancelanimationframe() from your main code when you're done using the animation, to ensure that no updates are still waiting to be run. the browser works out complex details such as making the animation run at a consistent speed, a...
...t works, let's quickly look again at our bouncing balls example (see it live, and also see the source code). the code for the loop that keeps everything moving looks like this: function loop() { ctx.fillstyle = 'rgba(0, 0, 0, 0.25)'; ctx.fillrect(0, 0, width, height); for(let i = 0; i < balls.length; i++) { balls[i].draw(); balls[i].update(); balls[i].collisiondetect(); } requestanimationframe(loop); } loop(); we run the loop() function once at the bottom of the code to start the cycle, drawing the first animation frame; the loop() function then takes charge of calling requestanimationframe(loop) to run the next frame of the animation, again and again. note that on each frame we are completely clearing the canvas and redrawing everything. for every ball present we draw...
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Introduction to the server side - Learn web development
ough other channels. all of these capabilities enable much deeper engagement with users. in the modern world of web development, learning about server-side development is highly recommended. what is server-side website programming? web browsers communicate with web servers using the hypertext transfer protocol (http). when you click a link on a web page, submit a form, or run a search, an http request is sent from your browser to the target server. the request includes a url identifying the affected resource, a method that defines the required action (for example to get, delete, or post the resource), and may include additional information encoded in url parameters (the field-value pairs sent via a query string), as post data (data sent by the http post method), or in associated cookies. web...
...r to the target server. the request includes a url identifying the affected resource, a method that defines the required action (for example to get, delete, or post the resource), and may include additional information encoded in url parameters (the field-value pairs sent via a query string), as post data (data sent by the http post method), or in associated cookies. web servers wait for client request messages, process them when they arrive, and reply to the web browser with an http response message. the response contains a status line indicating whether or not the request succeeded (e.g. "http/1.1 200 ok" for success). the body of a successful response to a request would contain the requested resource (e.g. a new html page, or an image, etc...), which could then be displayed by the web brow...
...k" for success). the body of a successful response to a request would contain the requested resource (e.g. a new html page, or an image, etc...), which could then be displayed by the web browser. static sites the diagram below shows a basic web server architecture for a static site (a static site is one that returns the same hard-coded content from the server whenever a particular resource is requested). when a user wants to navigate to a page, the browser sends an http "get" request specifying its url. the server retrieves the requested document from its file system and returns an http response containing the document and a success status (usually 200 ok). if the file cannot be retrieved for some reason, an error status is returned (see client error responses and server error responses). ...
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Website security - Learn web development
comments that contain unmodified html could store a malicious script from an attacker. when the comments are displayed, the script is executed and can send to the attacker the information required to access the user's account. this sort of attack is extremely popular and powerful, because the attacker might not even have any direct engagement with the victims. while the data from post or get requests is the most common source of xss vulnerabilities, any data from the browser is potentially vulnerable, such as cookie data rendered by the browser, or user files that are uploaded and displayed. the best defense against xss vulnerabilities is to remove or disable any markup that can potentially contain instructions to run the code. for html this includes elements, such as <script>, <object>, <e...
...s a very odd name indeed, but not harmful). select * from users where name = 'a\';drop table users; select * from userinfo where \'t\' = \'t'; web frameworks will often take care of the character escaping for you. django, for example, ensures that any user-data passed to querysets (model queries) is escaped. note: this section draws heavily on the information in wikipedia here. ...
...on the information in wikipedia here. cross-site request forgery (csrf) csrf attacks allow a malicious user to execute actions using the credentials of another user without that user’s knowledge or consent. this type of attack is best explained by example. john is a malicious user who knows that a particular site allows logged-in users to send money to a specified account using an http post request that includes the account name and an amount of money. john constructs a form that includes his bank details and an amount of money as hidden fields, and emails it to other site users (with the submit button disguised as a link to a "get rich quick" site). ...
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Setting up your own test automation environment - Learn web development
wserstack test details programmatically you can use the browserstack rest api and some other capabilities to annotate your test with more details, such as whether it passed, why it passed, what project the test is part of, etc. ...
...you can use the browserstack rest api and some other capabilities to annotate your test with more details, such as whether it passed, why it passed, what project the test is part of, etc. browserstack doesn't know these details by default! let's update our bstack_google_test.js demo, to show how these features work: first, we'll need to import the node request module, so we can use it to send requests to the rest api. ...
... with more details, such as whether it passed, why it passed, what project the test is part of, etc. browserstack doesn't know these details by default! let's update our bstack_google_test.js demo, to show how these features work: first, we'll need to import the node request module, so we can use it to send requests to the rest api. ...
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Using the Browser API
e it, you run the risk of your application being compromised by a malicious web site. it is implied for webextensions, which always run in a separate content process from web content. aside from the iframe, there are some basic controls: <button> elements, a simple <form> to implement the browser controls, and a search bar. the search bar also contains buttons, as well as a form to type search requests into. you can see the full html listing here. the javascript implementation to wire up the functionality required by our simple browser, we've written some basic javascript (see the full javascript listing.) wiring up the back and forward buttons early on in the code we implement two simple event listeners to move the browser back and forward in history when the relevant buttons are pressed:...
...also firing these functions on the touchend event, which is effective as firefox os devices are generally touchscreen. enabling/disabling the back and forward buttons you will also notice after a bit of surfing that the back and forward buttons are disabled when you cannot move backwards/forwards, and enabled when you can. ...
...uchend event, which is effective as firefox os devices are generally touchscreen. enabling/disabling the back and forward buttons you will also notice after a bit of surfing that the back and forward buttons are disabled when you cannot move backwards/forwards, and enabled when you can. ...
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NSPR Error Handling
rror type error functions error codes for information on naming conventions for nspr types, functions, and macros, see nspr naming conventions. error type prerrorcode error functions pr_seterror pr_seterrortext pr_geterror pr_getoserror pr_geterrortextlength pr_geterrortext error codes error codes defined in prerror.h: pr_out_of_memory_error insufficient memory to perform request. pr_bad_descriptor_error the file descriptor used as an argument in the preceding function is invalid. pr_would_block_error the operation would have blocked, which conflicts with the semantics that have been established. pr_access_fault_error one of the arguments of the preceding function specified an invalid memory address. pr_invalid_method_error the preceding function is invalid for th...
... the preceding function attempted to use connected semantics on a network file descriptor that was not connected. pr_load_library_error failure to load a dynamic library. pr_unload_library_error failure to unload a dynamic library. pr_find_symbol_error symbol could not be found in the specified library. pr_insufficient_resources_error there are insufficient system resources to process the request. pr_directory_lookup_error a directory lookup on a network address has failed. pr_tpd_range_error attempt to access a thread-private data index that is out of range of any index that has been allocated to the process. pr_proc_desc_table_full_error the process' table for holding open file descriptors is full. pr_sys_desc_table_full_error the system's table for holding open file descriptors...
... pr_not_socket_error an attempt to use a non-network file descriptor on a network-only operation. pr_not_tcp_socket_error attempt to perform a tcp specific function on a non-tcp file descriptor. pr_socket_address_is_bound_erro attempt to bind an address to a tcp file descriptor that is already bound. pr_no_access_rights_error calling thread does not have privilege to perform the operation requested. pr_operation_not_supported_erro the requested operation is not supported by the platform. pr_protocol_not_supported_error the host operating system does not support the protocol requested. pr_remote_file_error access to the remote file has been severed. pr_buffer_overflow_error the value retrieved is too large to be stored in the buffer provided. pr_connect_reset_error the (tcp) conn...
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JS_THREADSAFE
ript code concurrently as long as no objects or strings are shared between them. we have recently made major changes to this feature. until recently, sharing objects among threads would mostly work, although scripts could easily make it crash. we have now completely removed that feature. each thread that uses the javascript engine must essentially operate in a totally separate region of memory. ...
...cts among threads would mostly work, although scripts could easily make it crash. we have now completely removed that feature. each thread that uses the javascript engine must essentially operate in a totally separate region of memory. requests in a js_threadsafe build, the application must separate code that uses the jsapi from code that performs blocking i/o or time-consuming calculations. a request is a region of code that uses the jsapi. requests must be bracketed with calls to js_beginrequest() and js_endrequest(). js_beginrequest(cx); /* ... do jsapi stuff ... */ js_endrequest(cx); a request is always associated with a specific jscontext and runs from start to finish on a single thread. most jsapi functions require the caller to be in a request. in this reference, these jsapi functio...
...i. requests must be bracketed with calls to js_beginrequest() and js_endrequest(). js_beginrequest(cx); /* ... do jsapi stuff ... */ js_endrequest(cx); a request is always associated with a specific jscontext and runs from start to finish on a single thread. most jsapi functions require the caller to be in a request. in this reference, these jsapi functions are marked with the words "requires request", like this: name type description cx jscontext * the context to use. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. most jsapi callback functions are always called from within a request. ...
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nsICachingChannel
its behavior with respect to how it uses the cache service. method overview boolean isfromcache(); obsolete since gecko 2.0 attributes attribute type description cacheasfile boolean specifies whether or not the data should be cached to a file. this may fail if the disk cache is not present. the value of this attribute is usually only settable during the processing of a channel's onstartrequest. the default value of this attribute depends on the particular implementation of nsicachingchannel. cachefile nsifile get the "file" where the cached data can be found. this is valid for as long as a reference to the cache token is held. this may return an error if cacheasfile is false. read only. cacheforofflineuse boolean specifies whether or not the data should be placed in the offline cac...
...g removed. a cache key retrieved from a particular instance of nsicachingchannel could be set on another instance of nsicachingchannel provided the underlying implementations are compatible and provided the new channel instance was created with the same uri. the implementation of nsicachingchannel would be expected to use the cache entry identified by the cache token. depending on the value of nsirequest.loadflags(), the cache entry may be validated, overwritten, or simply read. the cache key may be null indicating that the uri of the channel is sufficient to locate the same cache entry. setting a null cache key is likewise valid. cachetoken nsisupports uniquely identifies the data in the cache. holding a reference to this token prevents the cached data from being removed. a cache token retrie...
...". offlinecachetoken nsisupports the same as cachetoken but accessing the offline app cache token if there is any. exceptions thrown ns_error_not_available when there is not offline cache token. constants constant value description load_no_network_io 1 << 26 this load flag inhibits fetching from the net. an error of ns_error_document_not_cached will be sent to the listener's onstoprequest if network io is necessary to complete the request. this flag can be used to find out whether fetching this url would cause validation of the cache entry via the network. combining this flag with load_bypass_local_cache will cause all loads to fail. this flag differs from load_only_from_cache in that this flag fails the load if validation is required while load_only_from_cache skips validation wh...
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nsIChannel
netwerk/base/nsichannel.idlscriptable this interface allows clients to construct 'get' requests for specific protocols, and manage them in a uniform way. inherits from: nsirequest last changed in gecko 19.0 (firefox 19.0 / thunderbird 19.0 / seamonkey 2.16) once a channel is created (via nsiioservice.newchannel()), parameters for that request may be set by using the channel attributes, or by calling queryinterface() to retrieve a subclass of nsichannel for protocol-specific parameters. then, the uri can be fetched by calling open() or asyncopen(). after a request has been completed, the channel is still valid for accessing protocol-specific results. for example, queryinterfacing to nsihttpchannel allows response headers to be retrieved for the corresponding http transaction. this...
...g file extension, wrong mime type, wrong document type stored on a server and so on.), and the caller most likely wants to verify with the actual data. setting contenttype before the channel has been opened provides a hint to the channel as to what the mime type is. the channel may ignore this hint in deciding on the actual mime type that it will report. setting contenttype after onstartrequest has been fired or after open() is called will override the type determined by the channel. setting contenttype between the time that asyncopen() is called and the time when onstartrequest is fired has undefined behavior at this time. the value of the contenttype attribute is a lowercase string. a value assigned to this attribute will be parsed and normalized as follows: any p...
...is attribute will be parsed and normalized as follows: any parameters (delimited with a ';') will be stripped. if a charset parameter is given, then its value will replace the the contentcharset attribute of the channel. the stripped contenttype will be lowercased. any implementation of nsichannel must follow these rules. notificationcallbacks nsiinterfacerequestor the notification callbacks for the channel. this is set by clients, who wish to provide a means to receive progress, status and protocol-specific notifications. if this value is null, the channel implementation may use the notification callbacks from its load group. the channel may also query the notification callbacks from its load group if its notification callbacks do not supply the ...
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nsIContentSecurityPolicy
policy.idlscriptable describes an xpcom component used to model and enforce content security policies. ...
... 2.0 (firefox 4 / thunderbird 3.3 / seamonkey 2.1) method overview boolean permitsancestry(in nsidocshell docshell); void refinepolicy(in astring policystring, in nsiuri selfuri); void scanrequestdata(in nsihttpchannel achannel); void sendreports(in astring blockeduri, in astring violateddirective); short shouldload(in unsigned long acontenttype, in nsiuri acontentlocation, in nsiuri arequestorigin, in nsisupports acontext, in acstring amimetypeguess, in nsisupports aextra); short shouldprocess(in unsigned long acontenttype, in nsiuri acontentlocation, in nsiuri arequestorigin, in nsisupports acontext, in acstring amimetype, in nsisupports aextra); attributes attribute type description allowseval boolean whether this policy allows eval and eval-like functions such as settim...
... parameters docshell containing the protected resource. return value true if the frame's ancestors are all permitted by policy. refinepolicy() updates the policy currently stored in the content security policy to be "refined" or tightened by the one specified in the string policystring. void refinepolicy( in astring policystring, in nsiuri selfuri ); parameters policystring selfuri scanrequestdata() called after the content security policy object is created to fill in the appropriate request and request header information needed in case a report needs to be sent. void scanrequestdata( in nsihttpchannel achannel ); parameters achannel sendreports() manually triggers violation report sending given a uri and reason. the uri may be null, in which case "self" is sent. void sendreports...
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nsIDocumentLoader
obsolete since gecko 1.8 nsiloadgroup getloadgroup(); o...
...obsolete since gecko 1.8 nsiloadgroup getloadgroup(); obsolete s...
...obsolete since gecko 1.8 nsiloadgroup getloadgroup(); obsolete since gecko 1.8 boolean isbusy(); obsolete since gecko 1.8 void stop(); attributes attribu...
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nsIProgressEventSink
mation is intended to be displayed to the user in some meaningful way. an implementation of this interface can be passed to a channel via the channel's notificationcallbacks attribute. see nsichannel for more info. the channel will begin passing notifications to the progress event sink after its asyncopen method has been called. ...
...meaningful way. an implementation of this interface can be passed to a channel via the channel's notificationcallbacks attribute. see nsichannel for more info. the channel will begin passing notifications to the progress event sink after its asyncopen method has been called. notifications will cease once the channel calls its listener's onstoprequest method or once the channel is canceled (via nsirequest.cancel()). ...
...te. see nsichannel for more info. the channel will begin passing notifications to the progress event sink after its asyncopen method has been called. notifications will cease once the channel calls its listener's onstoprequest method or once the channel is canceled (via nsirequest.cancel()). note: this interface is actually not specific to channels and may be used with other implementations of nsirequest. ...
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nsIWebProgressListener2
an extended version of nsiwebprogresslistener. uriloader/base/nsiwebprogresslistener2.idlscriptable please add a summary to this article. ...
... an extended version of nsiwebprogresslistener. uriloader/base/nsiwebprogresslistener2.idlscriptable please add a summary to this article. ...
...this function is identical to nsiwebprogresslistener.onprogresschange(), except that this function supports 64-bit values. ...
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Intensive JavaScript - Firefox Developer Tools
perience. you can use the frame rate and waterfall tools to see when javascript is causing performance problems, and to single out the particular functions that need attention. in this article we'll take an example site whose long-running javascript causes responsiveness problems, and apply two different approaches to fixing them. the first is to split long-running functions into pieces and use requestanimationframe to schedule each piece, and the second is to run the whole function in a separate thread using a web worker. if you want to play along you can find the demo website here. there's also a video version of this walkthrough: the demo website looks like this: it has three controls: a radio button group to control how to run the javascript: as a single blocking operation in the ...
...e function in a separate thread using a web worker. if you want to play along you can find the demo website here. there's also a video version of this walkthrough: the demo website looks like this: it has three controls: a radio button group to control how to run the javascript: as a single blocking operation in the main thread, as a series of smaller operations in the main thread using requestanimationframe(), or in another thread using a worker. a button to run the javascript, labeled "do pointless computations!". a button to start and stop some css animations. this just gives the browser some background tasks to perform. leaving the radio button set to "use blocking call in main thread", make a recording: press the "start animations" button start recording a performance profi...
...false; break; } } if (isprime) { primes.push(candidate); } } return primes; } function dopointlesscomputationswithblocking() { var primes = calculateprimes(iterations, multiplier); pointlesscomputationsbutton.disabled = false; console.log(primes); } we're just running a (very inefficient) primality test 50 times, for some quite large numbers. using requestanimationframe in the first attempt at fixing this, we'll split up the function into a number of much smaller self-contained functions, and schedule each one using requestanimationframe(). requestanimationframe() tells the browser to run the given function in each frame, just before it performs a repaint. as long as each function is reasonably small, the browser should be able to keep inside its...
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FetchEvent.respondWith() - Web APIs
the respondwith() method of fetchevent prevents the browser's default fetch handling, and allows you to provide a promise for a response yourself. in most cases you can provide any response that the receiver understands. for example, if an <img> initiates the request, the response body needs to be image data. for security reasons, there are a few global rules: you can only return response objects of type "opaque" if the fetchevent.request object's mode is "no-cors". this prevents the leaking of private data. you can only return response objects of type "opaqueredirect" if the fetchevent.request object's mode is "manual". you cannot return response objects of type "cors" if the fetchevent.request object's mode is "same-origin". specifying the final url of a resource from firefox 59 onwa...
... the provided response.url was effectively ignored. ...
... the provided response.url was effectively ignored. ...
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IDBObjectStore.add() - Web APIs
the add() method of the idbobjectstore interface returns an idbrequest object, and, in a separate thread, creates a structured clone of the value, and stores the cloned value in the object store. this is for adding new records to an object store. to determine if the add operation has completed successfully, listen for the transaction’s complete event in addition to the idbobjectstore.add request’s success event, because the transaction may still fail after the success event fires. in other words, the success event is only triggered when the transaction has been successfully queued. the add method is an insert only method. if a record already exists in the object store with the key parameter as its key, then an error constrainerror event is fired on the returned request object. for updati...
...d when the transaction has been successfully queued. the add method is an insert only method. if a record already exists in the object store with the key parameter as its key, then an error constrainerror event is fired on the returned request object. for updating existing records, you should use the idbobjectstore.put method instead. note: this feature is available in web workers. syntax var request = objectstore.add(value); var request = objectstore.add(value, key); parameters value the value to be stored. key optional the key to use to identify the record. if unspecified, it results to null. returns an idbrequest object on which subsequent events related to this operation are fired. exceptions this method may raise a domexception of one of the following types: except...
...n the following code snippet, we open a read/write transaction on our database and add some data to an object store using add(). note also the functions attached to transaction event handlers to report on the outcome of the transaction opening in the event of success or failure. ...
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IDBObjectStore.openCursor() - Web APIs
if a single valid key is passed, this will default to a range containing only that key. ...
...if a single valid key is passed, this will default to a range containing only that key. ...
...if a single valid key is passed, this will default to a range containing only that key. if nothing is passed, this will default to a key range that selects all the records in this object store. ...
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IDBTransaction.abort() - Web APIs
note: this feature is available in web workers. syntax transaction.abort(); exceptions this method may raise a domexception of the following type: exception description invalidstateerror the transaction has already been committed or aborted. ...
...and add some data to an object store. note also the functions attached to transaction event handlers to report on the outcome of the transaction opening in the event of success or failure. at the end, we simply abort any activity done under the current transaction using abort(). ...
...ctions attached to transaction event handlers to report on the outcome of the transaction opening in the event of success or failure. at the end, we simply abort any activity done under the current transaction using abort(). ...
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IDBTransaction.commit() - Web APIs
if it is called on a transaction that is not active, it throws an invalidstateerror domexception. ...
... if it is called on a transaction that is not active, it throws an invalidstateerror domexception. ...
... if it is called on a transaction that is not active, it throws an invalidstateerror domexception. ...
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IDBTransaction.db - Web APIs
saction on our database and add some data to an object store. note also the functions attached to transaction event handlers to report on the outcome of the transaction opening in the event of success or failure. at the end, we return the associated database connection using db. ...
...store. note also the functions attached to transaction event handlers to report on the outcome of the transaction opening in the event of success or failure. at the end, we return the associated database connection using db. ...
...e connection using db. for a full working example, see our to-do notifications app (view example live.) // let us open our database var dbopenrequest = window.indexeddb.open("todolist", 4); dbopenrequest.onsuccess = function(event) { note.innerhtml += '<li>database initialised.</li>'; // store the result of opening the database in the db variable. ...
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IDBTransaction.mode - Web APIs
on our database and add some data to an object store. note also the functions attached to transaction event handlers to report on the outcome of the transaction opening in the event of success or failure. at the end, we simply log the mode of the current transaction using mode. ...
...note also the functions attached to transaction event handlers to report on the outcome of the transaction opening in the event of success or failure. at the end, we simply log the mode of the current transaction using mode. ...
...ransaction using mode. for a full working example, see our to-do notifications app (view example live.) // let us open our database var dbopenrequest = window.indexeddb.open("todolist", 4); dbopenrequest.onsuccess = function(event) { note.innerhtml += '<li>database initialised.</li>'; // store the result of opening the database in the db variable. ...
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IndexedDB API - Web APIs
he browser works out how much space to allocate to web data storage and what to delete when that limit is reached is not simple, and differs between browsers. browser storage limits and eviction criteria attempts to explain how this works, at least in the case of firefox. interfaces to get access to a database, call open() on the indexeddb attribute of a window object. this method returns an idbrequest object; asynchronous operations communicate to the calling application by firing events on idbrequest objects. connecting to a database idbenvironment provides access to indexeddb functionality. it is implemented by the window and worker objects. this interface isn't part of the 2.0 specification. idbfactory provides access to a database. this is the interface implemented by the global obj...
... idbdatabase represents a connection to a database. it's the only way to get a transaction on the database. retrieving and modifying data idbtransaction represents a transaction. ...
...idbrequest objects. connecting to a database idbenvironment provides access to indexeddb functionality. it is implemented by the window and worker objects. this interface isn't part of the 2.0 specification. idbfactory provides access to a database. this is the interface implemented by the global object indexeddb and is therefore the entry point for the api. idbopendbrequest represents a request to open a database. idbdatabase represents a connection to a database. it's the only way to get a transaction on the database. retrieving and modifying data idbtransaction represents a transaction. you create a transaction on a database, specify the scope (such as which object stores you want to access), and determine the kind of access (read only or readwrite) that you want. ...
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Capabilities, constraints, and settings - Web APIs
nts() method is called to configure the api as desired by specifying the values or ranges of values it wishes to use for any of the constrainable properties about which it has a preference. the track's getconstraints() method returns the set of constraints passed into the most recent call to applyconstraints(). this may not represent the actual current state of the track, due to properties whose requested values had to be adjusted and because platform default values aren't represented. for a complete representation of the track's current configuration, use getsettings(). in the media stream api, both mediastream and mediastreamtrack have constrainable properties. determining if a constraint is supported if you need to know whether or not a given constriant is supported by the user agent, you...
...ntains zero or more individual constraints, as well as an optional sub-object named advanced, which contains another set of zero or more constraints which the user agent must satisfy if at all possible. the user agent attempts to satisfy constraints in the order specified in the constraint set. the most important thing to understand is that most constraints aren't requirements; instead, they're requests. there are exceptions, and we'll get to those shortly. requesting a specific value for a setting most simply, each constraint may be a specific value indicating a desired value for the setting. for example: let constraints = { width: 1920, height: 1080, aspectratio: 1.777777778 }; mytrack.applyconstraints(constraints); in this case, the constraints indicate that any values are fine fo...
... in this case, the constraints indicate that any values are fine for nearly all properties, but that a standard high definition (hd) video size is desired, with the standard 16:9 aspect ratio. there's no guarantee that the resulting track will match any of these, but the user agent should do its best to match as many as possible. ...
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Writing WebSocket servers - Web APIs
n't have to bloat your server code with cookie and authentication handlers (for example). the websocket handshake first, the server must listen for incoming socket connections using a standard tcp socket. depending on your platform, this may be handled for you automatically. for example, let's assume that your server is listening on example.com, port 8000, and your socket server responds to get requests at example.com/chat. warning: the server may listen on any port it chooses, but if it chooses any port other than 80 or 443, it may have problems with firewalls and/or proxies. browsers generally require a secure connection for websockets, although they may offer an exception for local devices. the handshake is the "web" in websockets. it's the bridge from http to websockets. in the handshak...
...although they may offer an exception for local devices. the handshake is the "web" in websockets. it's the bridge from http to websockets. in the handshake, details of the connection are negotiated, and either party can back out before completion if the terms are unfavorable. the server must be careful to understand everything the client asks for, otherwise security issues can occur. ...
...ust be careful to understand everything the client asks for, otherwise security issues can occur. tip: the request-uri (/chat here) has no defined meaning in the spec. so, many people use it to let one server handle multiple websocket applications. for example, example.com/chat could invoke a multiuser chat app, while /game on the same server might invoke a multiplayer game. client handshake request even though you're building a server, a client still has to start the websocket handshake process by contacting the server and requesting a websocket connection. so, you must know how to interpret the client's request. ...
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Spaces and reference spaces: Spatial tracking in WebXR - Web APIs
target space. thus a pose can be used to not only convert and determine positions, but also rotational information. there is only one way to create an xrpose, and that's using the getpose() method on an animation frame as given using an xrframe object. this means that most frequently, you'll be using poses within your frame rendering code, which is executed as a callback from the xrframe method requestanimationframe(). getpose() computes the position of an xrreferencespace relative to the origin of a specified xrspace and then creates a pose representing the resulting position and orientation. for example, if you wish to draw a hand controller's representation using the controller's gripspace, you can get the pose needed like this: let controlpose = frame.getpose(worldrefspace, inputsource.g...
...terface. when rendering a frame, you'll use the viewer pose to determine the position and facing direction of the viewer in order to place the virtual camera and render the scene. ...
...o place the virtual camera and render the scene. the only way to obtain a pose that adapts positional information from one space to another is through the xrframe object received by your frame rendering callback function specified when you called the xrsession method requestanimationframe(). ...
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XRSession.cancelAnimationFrame() - Web APIs
the cancelanimationframe() method of the xrsession interface cancels an animation frame which was previously requested by calling requestanimationframe. syntax xrsession.cancelanimationframe(handle); parameters handle the unique value returned by the call to requestanimationframe() that previously scheduled the animation callback. return value none. usage notes this function has no effect if the specified handle cannot be found. example in the example below we see code which starts up a webxr session if immersive vr mode is supported. once started, the session schedules its first frame to be rendered by calling requestanimationframe(). the pausexr() function shown at the bottom can be called to suspend the webvr session, in essence, by canceling any pending animation fr...
...d. once started, the session schedules its first frame to be rendered by calling requestanimationframe(). the pausexr() function shown at the bottom can be called to suspend the webvr session, in essence, by canceling any pending animation frame callback. since each frame callback schedules the next one, removing the callback terminates updating of the webxr scene. ...
...g animation frame callback. since each frame callback schedules the next one, removing the callback terminates updating of the webxr scene. ...
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Web APIs
ensionsffetch apifile system api frame timing apifullscreen apiggamepad api geolocation apihhtml drag and drop apihigh resolution timehistory apiiimage capture apiindexeddbintersection observer apillong tasks api mmedia capabilities api media capture and streamsmedia session apimedia source extensions mediastream recordingnnavigation timingnetwork information api ppage visibility apipayment request apiperformance apiperformance timeline apipermissions apipointer eventspointer lock apiproximity events push api rresize observer apiresource timing apisserver sent eventsservice workers apistoragestorage access apistreams ttouch eventsuurl apivvibration apivisual viewport wweb animationsweb audio apiweb authentication apiweb crypto apiweb notificationsweb storage apiweb workers apiwebglwebrt...
...udiodestinationnode audiolistener audionode audionodeoptions audioparam audioparamdescriptor audioparammap audioprocessingevent audioscheduledsourcenode audiotrack audiotracklist audioworklet audioworkletglobalscope audioworkletnode audioworkletnodeoptions audioworkletprocessor authenticatorassertionresponse authenticatorattestationresponse authenticatorresponse b baseaudiocontext basiccardrequest basiccardresponse batterymanager beforeinstallpromptevent beforeunloadevent biquadfilternode blob blobbuilder blobevent bluetooth bluetoothadvertisingdata bluetoothcharacteristicproperties bluetoothdevice bluetoothremotegattcharacteristic bluetoothremotegattdescriptor bluetoothremotegattserver bluetoothremotegattservice body broadcastchannel budgetservice budgetstate...
...gtc ext_texture_filter_anisotropic eckeygenparams eckeyimportparams ecdhkeyderiveparams ecdsaparams effecttiming element elementcssinlinestyle elementtraversal errorevent event eventlistener eventsource eventtarget extendableevent extendablemessageevent f featurepolicy federatedcredential fetchevent file fileentrysync fileerror fileexception filelist filereader filereadersync filerequest filesystem filesystemdirectoryentry filesystemdirectoryreader filesystementry filesystementrysync filesystemfileentry filesystemflags filesystemsync focusevent fontface fontfaceset fontfacesetloadevent formdata formdataentryvalue formdataevent fullscreenoptions g gainnode gamepad gamepadbutton gamepadevent gamepadhapticactuator geolocation geolocationcoordinates geolocati...
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Audio and Video Delivery - Developer guides
(myvideo.canplaytype('video/mp4')) { myvideo.setattribute('src','videofile.mp4'); } else if (myvideo.canplaytype('video/webm')) { myvideo.setattribute('src','videofile.webm'); } myvideo.width = 480; myvideo.height = 320; we set the source of the video depending on the type of video file the browser supports we then set the width and height of the video. ...
...deofile.mp4'); } else if (myvideo.canplaytype('video/webm')) { myvideo.setattribute('src','videofile.webm'); } myvideo.width = 480; myvideo.height = 320; we set the source of the video depending on the type of video file the browser supports we then set the width and height of the video. ...
... if (myvideo.canplaytype('video/webm')) { myvideo.setattribute('src','videofile.webm'); } myvideo.width = 480; myvideo.height = 320; we set the source of the video depending on the type of video file the browser supports we then set the width and height of the video. ...
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OPTIONS - HTTP
the http options method requests permitted communication options for a given url or server. a client can specify a url with this method, or an asterisk (*) to refer to the entire server. ...
... the http options method requests permitted communication options for a given url or server. a client can specify a url with this method, or an asterisk (*) to refer to the entire server. ...
... given url or server. a client can specify a url with this method, or an asterisk (*) to refer to the entire server. ...
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Protocol upgrade mechanism - HTTP
n. note also that http/2 explicitly disallows the use of this mechanism; it is specific to http/1.1. upgrading http/1.1 connections the upgrade header field is used by clients to invite the server to switch to one of the listed protocols, in descending preference order. because upgrade is a hop-by-hop header, it also needs to be listed in the connection header field. this means that a typical request that includes upgrade would look something like: get /index.html http/1.1 host: www.example.com connection: upgrade upgrade: example/1, foo/2 other headers may be required depending on the requested protocol; for example, websocket upgrades allow additional headers to configure details about the websocket connection as well as to offer a degree of security in opening the connection. see upgradi...
...t does not (or cannot) upgrade the connection, it ignores the upgrade header and sends back a regular response (for example, a 200 ok). right after sending the 101 status code, the server can begin speaking the new protocol, performing any additional protocol-specific handshakes as necessary. effectively, the connection becomes a two-way pipe as soon as the upgraded response is complete, and the request that initiated the upgrade can be completed over the new protocol. common uses for this mechanism here we look at the most common use cases for the upgrade header. upgrading to a websocket connection by far, the most common use case for upgrading an http connection is to use websockets, which are always implemented by upgrading an http or https connection. keep in mind that if you're opening ...
...websocket() constructor does all the work of creating an initial http/1.1 connection then handling the handshaking and upgrade process for you. you can also use the "wss://" url scheme to open a secure websocket connection. if you need to create a websocket connection from scratch, you'll have to handle the handshaking process yourself. after creating the initial http/1.1 session, you need to request the upgrade by adding to a standard request the upgrade and connection headers, as follows: connection: upgrade upgrade: websocket websocket-specific headers the following headers are involved in the websocket upgrade process. other than the upgrade and connection headers, the rest are generally optional or handled for you by the browser and server when they're talking to each other. sec-webs...
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Understanding latency - Web Performance
terms of performance optimization, it's important to optimize to reduce causes of lacency and to test site performance emulating high latency to optimizer for users with lousy connections. this article explains what latency is, how it impacts performance, how to measure latency, and how to reduce it. what is latency? latency is generally considered to be the amount of time it takes from when a request is made by the user to the time it takes for the response to get back to that user. on a first request, for the first 14kb bytes, latency is longer because it includes a dns lookup, a tcp handshake, the secure tls negotiation. subsequent requests will have less latency because the connection to the server is already set. latency describes the amount of delay on a network or internet connection.
...s already set. latency describes the amount of delay on a network or internet connection. low latency implies that there are no or almost no delays. high latency implies that there are many delays. one of the main aims of improving performance is to reduce latency. the latency associated with a single asset, especially a basic html page, may seem trivial. ...
...ribes the amount of delay on a network or internet connection. low latency implies that there are no or almost no delays. high latency implies that there are many delays. one of the main aims of improving performance is to reduce latency. the latency associated with a single asset, especially a basic html page, may seem trivial. but websites generally involve multiple requests: the html includes requests for multiple css, scripts, and media files. the greater the number and size of these requests, the greater the impact of high latency on user experience. on a connection with low latency, requested resources will appear almost immediately. on a connection with high latency, there will be a discernible delay between the time that a request is sent, and the resources are returned. we can determi...
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platform/xpcom - Archive of obsolete content
nt this factory creates. this will typically return a descendant of unknown, although it may return a custom object that satisfies the nsisupports interface. optional options: name type contract string a contract id. users of xpcom can use this value to retrieve the factory from components.classes: var factory = components.classes['@me.org/request'] var component = factory.createinstance(ci.nsirequest); this parameter is formally optional, but if you don't specify it, users won't be able to retrieve your factory using a contract id. if specified, the contract id is accessible as the value of the factory's contract property. id string a class id. users of xpcom can use this value to retrieve the factory using co...
...'t specify it, users won't be able to retrieve your factory using a contract id. if specified, the contract id is accessible as the value of the factory's contract property. id string a class id. users of xpcom can use this value to retrieve the factory using components.classesbyid: var factory = components.classesbyid[id]; var component = factory.createinstance(ci.nsirequest); this parameter is optional. if you don't supply it, the factory constructor will generate a fresh id. either way, it's accessible as the value of the factory's id property. register boolean by default, the factory is registered as soon as it is constructed. by including this option, set to false, the factory is not automatically registered and you must register it m...
...ctory or service to retrieve. returns object : the factory or service identified by the contract id. unknown this is the base class for all xpcom objects. it is not intended to be used directly but you can subclass it, either using standard javascript inheritance or using the sdk's heritage module, to create new implementations of xpcom interfaces. ...
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Progress Listeners - Archive of obsolete content
tabs. ...
...if you use mylistener for more than one tab/window, // use aprogress.domwindow to obtain the tab/window which triggered the change. }, // for definitions of the remaining functions see related documentation onprogresschange: function(awebpro...
...{ // this fires when the location bar changes; that is load event is confirmed // or when the user switches tabs. if you use mylistener for more than one tab/window, // use aprogress.domwindow to obtain the tab/window which triggered the change. ...
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Adding preferences to an extension - Archive of obsolete content
ed value of the preference by calling the nsiprefbranch.getcharpref() method, and stash it in our tickersymbol variable. once we've gotten the updated preference, we call refreshinformation() to immediately update the display with the new stock's information. watchstock() while we're at it, let's add a method that sets which stock we want to be watching, changing the preference and immediately requesting a refresh of the display. this method will be used when the user uses the popup menu we'll be adding to change what stock they're watching. watchstock: function(newsymbol) { this.prefs.setcharpref("symbol", newsymbol); }, the only new information for us here is the call to the preference object's setcharpref() function, which sets the value of the "symbol" preference. note that this c...
... a callback, we can't rely on // "this" referring to the right object, so we need to reference // it by its full name var symbol = stockwatcher.tickersymbol; var fullurl = "http://quote.yahoo.com/d/quotes.csv?f=sl1d1t1c1ohgv&e=.csv&s=" + symbol; function inforeceived() { var samplepanel = document.getelementbyid('stockwatcher2'); var output = httprequest.responsetext; if (output.length) { // remove any whitespace from the end of the string output = output.replace(/\w*$/, ""); // build the tooltip string var fieldarray = output.split(","); samplepanel.label = symbol + ": " + fieldarray[1]; samplepanel.tooltiptext = "chg: " + fieldarray[4] + " | " + "open: " + fieldarray[5]...
...we do this because since refreshinformation() is usually called as a callback from setinterval. in such cases this doesn't refer to the righ...
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jspage - Archive of obsolete content
efined)?"ipod":(navigator.platform.match(/mac|win|linux/i)||["other"])[0].tolowercase()},features:{xpath:!!(document.evaluate),air:!!(window.runtime),query:!!(document.queryselector)},plugins:{},engines:{presto:function(){return(!window.opera)?false:((arguments.callee.caller)?960:((document.getelementsbyclassname)?950:925)); },trident:function(){return(!window.activexobject)?false:((window.xmlhttprequest)?((document.queryselectorall)?6:5):4);},webkit:function(){return(navigator.taintenabled)?false:((browser.features.xpath)?((browser.features.query)?525:420):419); },gecko:function(){return(!document.getboxobjectfor&&window.mozinnerscreenx==null)?false:((document.getelementsbyclassname)?19:18);}}},browser||{});browser.platform[browser.platform.name]=true; browser.detect=function(){for(var b in this...
...o:function(){return(!document.getboxobjectfor&&window.mozinnerscreenx==null)?false:((document.getelementsbyclassname)?19:18);}}},browser||{});browser.platform[browser.platform.name]=true; browser.detect=function(){for(var b in this.engines){var a=this.engines[b]();if(a){this.engine={name:b,version:a};this.engine[b]=this.engine[b+a]=true; break;}}return{name:b,version:a};};browser.detect();browser.request=function(){return $try(function(){return new xmlhttprequest();},function(){return new activexobject("msxml2.xmlhttp"); },function(){return new activexobject("microsoft.xmlhttp");});};browser.features.xhr=!!(browser.request());browser.plugins.flash=(function(){var a=($try(function(){return navigator.plugins["shockwave flash"].description; },function(){return new activexobject("shockwaveflash.shock...
...){a=a[0]||1.618;return math.pow(b,2)*((a+1)*b-a);},bounce:function(f){var e;for(var d=0,c=1;1;d+=c,c/=2){if(f>=(7-4*d)/11){e=c*c-math.pow((11-6*d-11*f)/4,2); break;}}return e;},elastic:function(b,a){return math.pow(2,10*--b)*math.cos(20*b*math.pi*(a[0]||1)/3);}});["quad","cubic","quart","quint"].each(function(b,a){fx.transitions[b]=new fx.transition(function(c){return math.pow(c,[a+2]); });});var request=new class({implements:[chain,events,options],options:{url:"",data:"",headers:{"x-requested-with":"xmlhttprequest",accept:"text/javascript, text/html, application/xml, text/xml, */*"},async:true,format:false,method:"post",link:"ignore",issuccess:null,emulation:true,urlencoded:true,encoding:"utf-8",evalscripts:false,evalresponse:false,nocache:false},initialize:function(a){this.xhr=new browser.reque...
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NPAPI plugin reference - Archive of obsolete content
the names of all of these methods begin with npn_ to indicate that they are implemented by the browser and called by the plug-in. np_getmimedescription np_getmimedescription returns a supported mime type list for your plugin. it works on unix (linux) and macos. ...
...t substructure of npprint that contains platform-specific information used during full-page mode printing. npidentifier npidentifier is an opaque type used for method and property identifiers, such as strings or integers. npidentifiers are unique, in that for any given string or integer, there is only one npidentifier. the lifetime of npidentifiers is controlled by the browser. npn newstream requests the creation of a new data stream produced by the plug-in and consumed by the browser. npn_createobject allocates a new npobject. npn_destroystream closes and deletes a stream. npn_enumerate gets the names of the properties and methods of the specified npobject. npn_evaluate evaluates a script in the scope of the specified npobject. npn_forceredraw asks the plugin host to immediately (...
...identifier for the integer that is passed in. npn_getproperty gets the value of a property on the specified npobject. npn_getstringidentifier returns an opaque identifier for the string that is passed in. npn_getstringidentifiers returns an array of opaque identifiers for the names that are passed in. npn_geturl asks the browser to create a stream for the specified url. npn_geturlnotify requests creation of a new stream with the contents of the specified url; gets notification of the result. npn_getvalue allows the plug-in to query the browser for information. npn_getvalueforurl provides information to a plugin which is associated with a given url, for example the cookies or preferred proxy. npn_hasmethod determines whether or not the specified npobject has a particular method. n...
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Using IO Timeout And Interrupt On NT - Archive of obsolete content
e before the specified timeout, the io function returns with <tt>pr_io_timeout_error</tt>. if the thread gets interrupted by another thread's <tt>pr_interrupt()</tt> call, the io function returns with <tt>pr_pending_interrupt_error</tt>. on windows nt, nspr io is implemented using nt's overlapped (also called asynchronous) io. when a thread calls an io function, the thread issues an overlapped io request using the overlapped buffer in its <tt>prthread</tt> structure. then the thread is put to sleep. in the meantime, there are dedicated internal threads (called the idle threads) monitoring the io completion port for completed io requests. if a completed io request appears at the io completion port, an idle thread fetches it and wakes up the thread that issued the io request earlier. this is the no...
... if the thread gets interrupted by another thread's <tt>pr_interrupt()</tt> call. ...
...io request appears at the io completion port, an idle thread fetches it and wakes up the thread that issued the io request earlier. this is the normal way the thread is awakened. io timeout and interrupt however, nspr may wake up the thread in two other situations: if the overlapped io request is not completed before the specified timeout. (note that we can't specify timeout on overlapped io requests, so the timeouts are all handled at the nspr level.) in this case, the error is <tt>pr_io_timeout_error</tt>. if the thread gets interrupted by another thread's <tt>pr_interrupt()</tt> call. in this case, the error is <tt>pr_pending_interrupt_error</tt>. ...
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Using workers in extensions - Archive of obsolete content
series: creating a status bar extension creating a dynamic status bar extension adding preferences to an extension localizing an extension updating an extension to support multiple mozilla applications download the sample you may download the complete example: download the example. how this differs from previous versions this version of the stock ticker extension moves the xmlhttprequest call that fetches updated stock information into a worker thread, which then passes that information back to the main body of the extension's code to update the display in the status bar. this demonstrates not only how to use workers in an extension, but also how to perform xmlhttprequest in a worker, and how workers and main thread code can pass data back and forth. the worker the worker threa...
...to a worker thread, which then passes that information back to the main body of the extension's code to update the display in the status bar. this demonstrates not only how to use workers in an extension, but also how to perform xmlhttprequest in a worker, and how workers and main thread code can pass data back and forth. the worker the worker thread's job in this example is to issue the xmlhttprequest calls that fetch the updated stock information. that's all it does. every 10 minutes, it calls xmlhttprequest, and, when the results are received, sends an event back to the main thread with the received data. so we need to move the refreshinformation() method from the stockwatcher2.js file into a separate file that will host the worker thread. that file, ticker_worker.js, is shown here: var sy...
...shinformation() method from the stockwatcher2.js file into a separate file that will host the worker thread. ...
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XInclude - MDN Web Docs Glossary: Definitions of Web-related terms
e; } var j; var xincludeparent = xinclude.parentnode; try { netscape.security.privilegemanager.enableprivilege('universalxpconnect universalbrowserread'); // necessary with file:///-located files trying to reach external sites if (href !== null) { var response, responsetype; var request = new xmlhttprequest(); request.open('get', href, false); request.setrequestheader('if-modified-since', 'thu, 1 jan 1970 00:00:00 gmt'); request.setrequestheader('cache-control', 'no-cache'); if (accept) { request.setrequestheader('accept', accept); } if ...
... request.open('get', href, false); request.setrequestheader('if-modified-since', 'thu, 1 jan 1970 00:00:00 gmt'); request.setrequestheader('cache-control', 'no-cache'); if (accept) { request.setrequestheader('accept', accept); } if (acceptlanguage) { request.setrequestheader('accept-language', acceptlanguage); } switch (parse) { case 'text': // priority should be on media type: var contenttype = request.getresponseheader('content-type'); //text/xml; charset="utf-8" // send to get headers first? ...
...(patternxml))) { /* grab the response as text (see below for that routine) and then find encoding within*/ var encname = '([a-za-z][a-za-z0-9._-]*)'; var pattern = new regexp('^<\\?xml\\s+.*encoding\\s*=\\s*([\'"])'+encname+'\\1.*\\?>'); // check document if not? ...
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Localization sign-off reviews
the sign-off review process has been notoriously shrouded in mystery. we use this review process to perform quality assurance (qa) testing on your l10n efforts. this ensures that every user who downloads your localized mozilla application receives all of your hard work in a functional product. ...
.... newly translated strings that shouldn't have been translated self-explanatory enough, right? access key changes we ensure that when access keys are changed that they are consistent with the keyboard layout for that particular locale and not blended between two or more distinct layouts. how it all works a large part of the review process takes place before you even submit your request for a sign-off review. to put it simply, when we receive your request, we expect that you have spent time testing your work and making sure all strings have been localized and that your changes are relatively functional. your review request symbolically represents that you have worked on your localization, tested it successfully, and found it to represent the best of your work. so before you requ...
...from the dropdown menu next to the appropriate approval flags (see image). ...
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An overview of NSS Internals
look up raw keys. the preferred approach is to use certificates, and to look up certificates by properties such as the contained subject name (information that describes the owner of the certificate). for example, while nss supports random calculation (creation) of a new public/private key pair, it's difficult to work with such a raw key pair. the usual approach is to create a certificate signing request (csr) as soon as an application is done with the creation step, which will have created a handle to the key pair, and which can be used for the necessary related operations, like producing a proof-of-ownership of the private key, which is usually required when submitting the public key with a csr to a ca. the usual follow up action is receiving a signed certificate from a ca. (however, it's also ...
...nt messaging implementations, a dbm library that implements the classic database storage, and finally a core nss library for the big set of “everything else”. newer generations of the database use the sqlite database to allow concurrent access by multiple applications. all of the above are provided as shared libraries. the crmf library, which is used to produce certain kinds of certificate requests, is available as a library for static linking only. when dealing with certificates (x.509), file formats such as pkcs#12 (certificates and keys), pkcs#7 (signed data), and message formats as cms, we should mention asn.1, which is a syntax for storing structured data in a very efficient (small sized) presentation. it was originally developed for telecommunication systems at times where it was ...
...g with memory, nss makes use of arenas, which are an attempt to simplify management with the limited offerings of c (because there are no destructors). the idea is to group multiple memory allocations in order to simplify cleanup. performing an operation often involves allocating many individual data items, and the code might be required to abort a task at many positions in the logic. an arena is requested once processing of a task starts, and all memory allocations that are logically associated to that task are requested from the associated arena. the implementation of arenas makes sure that all individual memory blocks are tracked. once a task is done, regardless whether it completed or was aborted, the programmer simply needs to release the arena, and all individually allocated blocks will be ...
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Necko Interfaces Overview
andlers provides interface for creating uri objects from uri strings maps uri scheme to appropriate nsiprotocolhandler impl nsiuri (nsiurl, nsifileurl, nsistandardurl) represents an uri, with getters and setters for various uri parts (eg. ...
..., host, path, ...) per protocol implementation necko provides uri impl's for common uri formats (see nsstandardurl, nssimpleuri) nsichannel : nsirequest represents a logical connection to the resource identified by a nsiuri per protocol implementation single use (ie. channel is used to download the resource once) download initiated via nsichannel::asyncopen method can be canceled via nsirequest::cancel method at anytime after invocation of asyncopen method nsiprotocolhandler a service that manages a protocol, identified by it's uri scheme (eg. ...
...) download initiated via nsichannel::asyncopen method can be canceled via nsirequest::cancel method at anytime after invocation of asyncopen method nsiprotocolhandler a service that manages a protocol, identified by it's uri scheme (eg. ...
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JSAPI reference
k enum jscontextop js_getruntime js_getparentruntime added in spidermonkey 31 js_getobjectruntime added in spidermonkey 17 js_getcontextprivate js_setcontextprivate js_getsecondcontextprivate added in spidermonkey 17 js_setsecondcontextprivate added in spidermonkey 17 js_setinterruptcallback added in spidermonkey 31 js_getinterruptcallback added in spidermonkey 31 js_requestinterruptcallback added in spidermonkey 31 js_checkforinterrupt added in jsapi 45 js_destroycontextmaybegc obsolete since jsapi 14 js_setbranchcallback obsolete since javascript 1.9.1 js_setoperationcallback obsolete since jsapi 30 js_getoperationcallback obsolete since jsapi 30 js_triggeroperationcallback obsolete since jsapi 30 js_clearoperationcallback obsolete since javascript 1.9.1 ...
...nctions support the spidermonkey threading model. note: js_threadsafe is now permanently on and the jsruntime is single-threaded. to execute more than one js script at once, use multiple jsruntimes. jsapi 1.7 and earlier they are only available in js_threadsafe builds. added in spidermonkey 1.8 these functions are always available, but in non-js_threadsafe builds, they do nothing. ...
... the spidermonkey threading model. note: js_threadsafe is now permanently on and the jsruntime is single-threaded. to execute more than one js script at once, use multiple jsruntimes. jsapi 1.7 and earlier they are only available in js_threadsafe builds. added in spidermonkey 1.8 these functions are always available, but in non-js_threadsafe builds, they do nothing. ...
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XML Extras
t as just another document format. the module is structured as a drop-in component and exposes its xml-as-data features both to javascript and c++/xpcom users. the xml extras module is built by default on all platforms, and is included in the browser installers so it is available in the nightly builds. feature status feature status xmlserializer available xmlhttprequest available domparser (string and stream input source) available web services with soap and wsdl no longer available from gecko 1.9/firefox 3. xml persistence fixptr and xpointer available since 1.4alpha in the core mozilla. moved to xml extras during 1.4beta. see also: xml in mozilla document.load() a few examples dealing with xml fr...
...er available from gecko 1.9/firefox 3. xml persistence fixptr and xpointer available since 1.4alpha in the core mozilla. moved to xml extras during 1.4beta. see also: xml in mozilla document.load() a few examples dealing with xml from mozillazine knowledge base. qa and testing there are some online tests for mainly exercising the http get method via xmlhttprequest. other test cases for each of the implemented components listed above exist in extensions/xmlextras/tests/. more exhaustive test suites need to be created, however. if you'd like to help out with qa, you can do one of the following: sign up as the qa owner for any of the implemented components. the qa owner will manage the tests associated with their component, act as qa contact for related b...
...extras/tests/. file bugs against the implemented components. bugs should be filed against the xml component in the browser product. documentation probably the best way to learn how to use these technologies is through examples. there are some in extensions/xmlextras/tests/. if you follow that link to look at the examples you will need to look at page source for the html documents. for xmlhttprequest object you can mostly rely on the microsoft xmlhttprequest documentation, with some caveats: all functions and property names begin with a lower case letter and the object creation is different. some properties are not implemented. thad hoffman has written a document that shows how you can mimic xml data islands in mozilla. edmond woychowsky has also written articles on xml data islands in mozil...
...And 4 more matches

Components.utils.importGlobalProperties
using this api you can import these objects into such a system scope. this function is not intended for sandboxes but for system-privileged scopes. to import these objects into a sandbox, use the wantglobalproperties option in the sandbox constructor. this function is passed an array of strings. each string is the name of an object to import, and will be defined on the importing scope's global. ...
... syntax void components.utils.importglobalproperties([string1, string2, ...]); parameters [string1, string2, ...] an array of strings. each string is the name of an ...
... syntax void components.utils.importglobalproperties([string1, string2, ...]); parameters [string1, string2, ...] an array of strings. each string is the name of an object to import. e...
...And 4 more matches

nsIDocShell
boolean isbeingdestroyed(); void loadstream(in nsiinputstream astream, in nsiuri auri, in acstring acontenttype, in acstring acontentcharset, in nsidocshellloadinfo aloadinfo); native code only! void loaduri(in nsiuri uri, in nsidocshellloadinfo loadinfo, in unsigned long aloadflags, in boolean firstparty); native code only! void pr...
... boolean isbeingdestroyed(); void loadstream(in nsiinputstream astream, in nsiuri auri, in acstring acontenttype, in acstring acontentcharset, in nsidocshellloadinfo aloadinfo); native code only! void loaduri(in nsiuri uri, in nsidocshellloadinfo loadinfo, in unsigned long aloadflags, in boolean firstparty); native code only! void prepareforn...
... kcharsetuninitialized 0 the character set has not yet been initialized. kcharsetfromweakdoctypedefault 1 kcharsetfromuserdefault 2 the user's default character set is being used. kcharsetfromdoctypedefault 3 the character set has been inferred from the doctype. all values from here upward are confident enough to be used for xmlhttprequest. kcharsetfromcache 4 the character set has been retrieved from the cache. kcharsetfromparentframe 5 the parent frame's character set is being used. kcharsetfromautodetection 6 the character set was automatically detected. kcharsetfromhintprevdoc 7 the character set was hinted by the previous document. kcharsetfrommetaprescan ...
...And 4 more matches

nsILoadGroup
netwerk/base/public/nsiloadgroup.idlscriptable a load group maintains a collection of nsirequest objects. inherits from: nsirequest last changed in gecko 1.7 method overview void addrequest(in nsirequest arequest, in nsisupports acontext); void removerequest(in nsirequest arequest, in nsisupports acontext, in nsresult astatus); attributes attribute type description activecount unsigned long returns the count of "active" requests (that is requests without the load_background bit set). read only. ...
...quest, in nsisupports acontext); void removerequest(in nsirequest arequest, in nsisupports acontext, in nsresult astatus); attributes attribute type description activecount unsigned long returns the count of "active" requests (that is requests without the load_background bit set). read only. defaultloadrequest nsirequest accesses the default load request for the group. each time a number of requests are added to a group, the defaultloadrequest may be set to indicate that all of the requests are related to a base request. the load group inherits its load flags from the default load request. if the default load request is null, then the group's load flags are not changed. ...
...esses the default load request for the group. each time a number of requests are added to a group, the defaultloadrequest may be set to indicate that all of the requests are related to a base request. the load group inherits its load flags from the default load request. if the default load request is null, then the group's load flags are not changed. groupobserver nsirequestobserver the group observer is notified when requests are added to and removed from this load group. the groupobserver is weak referenced. notificationcallbacks nsiinterfacerequestor notification callbacks for the load group. requests nsisimpleenumerator returns the requests contained directly in this group. enumerator element type: nsi...
...And 4 more matches

nsIPushSubscription
dom/interfaces/push/nsipushservice.idlscriptable includes information needed to send a push message to privileged code. inherits from: nsisupports last changed in gecko 46.0 (firefox 46.0 / thunderbird 46.0 / seamonkey 2.43) each subscription is associated with a unique url generated by the push service. sending a post request to this url routes the message to the instance of firefox that created the subscription. a subscription also has a public key and secret; these are used to encrypt message payloads. this interface resembles pushsubscription from the push api. method overview void getkey(in domstring name, [optional] out uint32_t keylen, [array, size_is(keylen), retval] out uint8_t key); bool quotaapplies(); bool isexpired(); attributes ...
...meters none. ...
... key: string.fromcharcode.ap...
...And 4 more matches

AudioBufferSourceNode.loop - Web APIs
codeaudiodata function is used to decode an audio track and put it into an audiobuffersourcenode. buttons are provided to play and stop the audio playback, and a slider control is used to change the playbackrate property value on the fly. when the audio is played, it loops. ...
...n is used to decode an audio track and put it into an audiobuffersourcenode. buttons are provided to play and stop the audio playback, and a slider control is used to change the playbackrate property value on the fly. when the audio is played, it loops. ...
...ecode an audio track and put it into an audiobuffersourcenode. buttons are provided to play and stop the audio playback, and a slider control is used to change the playbackrate property value on the fly. when the audio is played, it loops. ...
...And 4 more matches

AudioBufferSourceNode.loopEnd - Web APIs
, then begin playback, the sound will play normally until it reaches the 25 second mark. then the current play position will loop back to the 20 second mark and continue playing until the 25 second mark, ad infinitum (or at least until stop() is called). for a full working example, see this code running live, or view the source. ...
..., the sound will play normally until it reaches the 25 second mark. then the current play position will loop back to the 20 second mark and continue playing until the 25 second mark, ad infinitum (or at least until stop() is called). for a full working example, see this code running live, or view the source. ...
...ll play normally until it reaches the 25 second mark. then the current play position will loop back to the 20 second mark and continue playing until the 25 second mark, ad infinitum (or at least until stop() is called). for a full working example, see this code running live, or view the source. ...
...And 4 more matches

AudioBufferSourceNode.loopStart - Web APIs
audio is played to the end, it loops, but you can control how long the loops last by altering loopstart and loopend. for example, if you set their values to 20 and 25, respectively, the audio will start to loop between 20 and 25 seconds in to the track. for a full working example, see this code running live, or view the source. ...
...he end, it loops, but you can control how long the loops last by altering loopstart and loopend. for example, if you set their values to 20 and 25, respectively, the audio will start to loop between 20 and 25 seconds in to the track. for a full working example, see this code running live, or view the source. ...
...ps, but you can control how long the loops last by altering loopstart and loopend. for example, if you set their values to 20 and 25, respectively, the audio will start to loop between 20 and 25 seconds in to the track. for a full working example, see this code running live, or view the source. ...
...And 4 more matches

AudioBufferSourceNode.playbackRate - Web APIs
slider control is used to change the playbackrate property value on the fly. you can run the example live (or view the source.) play the song and alter the playback rate for some fun results. ...
...d to change the playbackrate property value on the fly. you can run the example live (or view the source.) play the song and alter the playback rate for some fun results. ...
...e playbackrate property value on the fly. you can run the example live (or view the source.) play the song and alter the playback rate for some fun results. ...
...And 4 more matches

Beacon API - Web APIs
example use cases of the beacon api are logging activity and sending analytics data to the server. example code of the interfaces described in this document is included in using the beacon api. ...
... example use cases of the beacon api are logging activity and sending analytics data to the server. example code of the interfaces described in this document is included in using the beacon api. ...
... example use cases of the beacon api are logging activity and sending analytics data to the server. example code of the interfaces described in this document is included in using the beacon api. ...
...And 4 more matches

CacheStorage.match() - Web APIs
the match() method of the cachestorage interface checks if a given request or url string is a key for a stored response. this method returns a promise for a response, or a promise which resolves to undefined if no match is found. you can access cachestorage through the global caches property. cache objects are searched in creation order. note: caches.match() is a convenience method. equivalent functionality is to call cache.match() on each cache (in the order returned by caches.keys()) until a response is returned. syntax caches.match(request, options).then(function(response) { // do something with the response }); parameters request the request you want to match. this can be a request object or a url string. options optional an object whose properties control how matching is do...
...atch operation. the available options are: ignoresearch: a boolean that specifies whether the matching process should ignore the query string in the url. for example, if set to true, the ?value=bar part of http://foo.com/?value=bar would be ignored when performing a match. it defaults to false. ignoremethod: a boolean that, when set to true, prevents matching operations from validating the request http method (normally only get and head are allowed.) it defaults to false. ignorevary: a boolean that, when set to true, tells the matching operation not to perform vary header matching. in other words, if the url matches you will get a match regardless of whether the response object has a vary header or not. it defaults to false. cachename: a domstring that represents a specific cache to se...
... tells the matching operation not to perform vary header matching. in other words, if the url matches you will get a match regardless of whether the response object has a vary header or not. it defaults to false. cachename: a domstring that represents a specific cache to search within. return value a promise that resolves to the matching response. ...
...And 4 more matches

Fetch API - Web APIs
the fetch api provides an interface for fetching resources (including across the network). it will seem familiar to anyone who has used xmlhttprequest, but the new api provides a more powerful and flexible feature set. concepts and usage fetch provides a generic definition of request and response objects (and other things involved with network requests). this will allow them to be used wherever they are needed in the future, whether it’s for service workers, cache api, and other similar things that handle or modify requests and responses, or any kind of use case that might require you to generate your responses programmatically (that is, the use of computer program or personal programming instructions). it also defines related concepts such as cors and the http origin header semantics, supp...
...it is implemented in multiple interfaces, specifically window and workerglobalscope. this makes it available in pretty much any context you might want to fetch resources in. ...
...d fetching a resource, use the windoworworkerglobalscope.fetch() method. it is implemented in multiple interfaces, specifically window and workerglobalscope. this makes it available in pretty much any context you might want to fetch resources in. the fetch() method takes one mandatory argument, the path to the resource you want to fetch. ...
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Using the Gamepad API - Web APIs
he gamepad object, including holding a reference to it and querying it to find out which buttons and axes are being pressed at any one time. doing so is often desirable for games or other interactive web pages that need to know the state of a gamepad now vs. the next time an event fires. performing such checks tends to involve using the gamepad object in conjunction with an animation loop (e.g., requestanimationframe), where developers want to make decisions for the current frame based on the state of the gamepad or gamepads. the navigator.getgamepads() method returns an array of all devices currently visible to the webpage, as gamepad objects (the first value is always null, so null will be returned if there are no gamepads connected.) this can then be used to get the same information. for exa...
... subsequent gamepad connections) and allows you to move a ball around the screen using the four gamepad buttons on the right hand side of the gamepad. you can view the demo live, and find the source code on github. to start with, we declare some variables: the gamepadinfo paragraph that the connection info is written into, the ball that we want to move, the start variable that acts as the id for requestanimation frame, the a and b variables that act as position modifiers for moving the ball, and the shorthand variables that will be used for the requestanimationframe() and cancelanimationframe() cross browser forks. var gamepadinfo = document.getelementbyid("gamepad-info"); var ball = document.getelementbyid("ball"); var start; var a = 0; var b = 0; next we use the gamepadconnected event to ch...
...indow.addeventlistener("gamepadconnected", function(e) { var gp = navigator.getgamepads()[e.gamepad.index]; gamepadinfo.innerhtml = "gamepad connected at index " + gp.index + ": " + gp.id + ". it has " + gp.buttons.length + " buttons and " + gp.axes.length + " axes."; gameloop(); }); now we use the gamepaddisconnected event to check if the gamepad is disconnected again. if so, we stop the requestanimationframe() loop (see below) and revert the gamepad information back to what it was originally. window.addeventlistener("gamepaddisconnected", function(e) { gamepadinfo.innerhtml = "waiting for gamepad."; cancelrequestanimationframe(start); }); chrome does things differently here. instead of constantly storing the gamepad's latest state in a variable it only stores a snapshot, so to do...
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Ajax navigation example - Web APIs
second example</a> | <a class="ajax-nav" href="third_page.php">third example</a> | <a class="ajax-nav" href="unexisting.php">unexisting page</a> ] </p> include/header.php: <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <script type="text/javascript" src="js/ajax_nav.js"></script> <link rel="stylesheet" href="css/style.css" /> js/ajax_nav.js: "use strict"; const ajaxrequest = new (function () { function closereq () { oloadingbox.parentnode && document.body.removechild(oloadingbox); bisloading = false; } function abortreq () { if (!bisloading) { return; } oreq.abort(); closereq(); } function ajaxerror () { alert("unknown error."); } function ajaxload () { var vmsg, nstatus = this.
... ajaxerror(); } } closereq(); } function filterurl (surl, sviewmode) { return surl.replace(rsearch, "") + ("?" + surl.replace(rhost, "&").replace(rview, sviewmode ? ...
... (bisloading) { return; } oreq = new xmlhttprequest(); bisloading = true; oreq.onload = ajaxload; oreq.onerror = ajaxerror; if (spage) { opageinfo.url = filterurl(spage, null); } oreq.open("get", filterurl(opageinfo.url, "json"), true); oreq.send(); oloadingbox.parentnode || document.body.appendchild(oloadingbox); } function requestpage (surl) { if (history.pushstate) { bupdateurl = true; getpage(surl); } else { /* ajax navigation is not supported */ location.assign(surl); } } function processlink () { if (this.classname === sajaxclass) { requestpage(this.href); return false; } return true; } ...
...And 4 more matches

IDBDatabase: error event - Web APIs
the error event is fired on idbdatabase when a request returns an error and the event bubbles up to the connection object. ...
...s up to the connection object. ...
... cancelable no interface event event handler property onerror examples this example opens a database and tries to add a record, listening for the error event for the add() operation (this will occur if, for example, a record with the given tasktitle already exists): // open the database const dbopenrequest = window.indexeddb.open('todolist', 4); dbopenrequest.onupgradeneeded = (event) => { const db = event.target.result; // create an objectstore for this database const objectstore = db.createobjectstore('todolist', { keypath: 'tasktitle' }); // define what data items the objectstore will contain objectstore.createindex('hours', 'hours', { unique: false }); objectstore.createindex('minutes', 'minutes', { unique: false }); objectstore.cr...
...And 4 more matches

IDBDatabase - Web APIs
events listen to these events using addeventlistener() or by assigning an event listener to the oneventname property of this interface. abort fired when when a transaction is aborted and bubbles up to the connection object. also available via the onabort property. close fired when the database connection is unexpectedly closed. also available via the onclose property. error fired when a request returns an error and the event bubbles up to the connection object. also available via the onerror property. versionchange fired when a database structure change was requested. also available via the onversionchange property. example in the following code snippet, we open a database asynchronously (idbfactory), handle success and error cases, and create a new object store in the case that an...
...change was requested. also available via the onversionchange property. example in the following code snippet, we open a database asynchronously (idbfactory), handle success and error cases, and create a new object store in the case that an upgrade is needed (idbdatabase). ...
...e success and error cases, and create a new object store in the case that an upgrade is needed (idbdatabase). ...
...And 4 more matches

IDBFactory.deleteDatabase() - Web APIs
the deletedatabase() method of the idbfactory interface requests the deletion of a database. the method returns an idbopendbrequest object immediately, and performs the deletion operation asynchronously. if the database is successfully deleted, then a success event is fired on the request object returned from this method, with its result set to undefined. if an error occurs while the database is being deleted, then an error event is fired on the request object that is returned from this method. when deletedatabase() is called, any other open connections to this particular database will get a versionchange event. note: this feature is available in web workers. ...
... this method, with its result set to undefined. if an error occurs while the database is being deleted, then an error event is fired on the request object that is returned from this method. when deletedatabase() is called, any other open connections to this particular database will get a versionchange event. note: this feature is available in web workers. syntax for the current standard: var request = indexeddb.deletedatabase(name); for the experimental version with options (see below): var request = indexeddb.deletedatabase(name, options); parameters name the name of the database you want to delete. note that attempting to delete a database that doesn't exist does not throw an exception, in contrast to idbdatabase.deleteobjectstore(), which does throw an exception if the named object...
...on, in contrast to idbdatabase.deleteobjectstore(), which does throw an exception if the named object store does not exist. ...
...And 4 more matches

IDBObjectStore.delete() - Web APIs
the delete() method of the idbobjectstore interface returns an idbrequest object, and, in a separate thread, deletes the specified record or records. either a key or an idbkeyrange can be passed, allowing one or multiple records to be deleted from a store. to delete all records in a store, use idbobjectstore.clear. bear in mind that if you are using a idbcursor, you can use the idbcursor.delete() method to more efficiently delete the current record — without having to explicitly look up the record's key. note: this feature is available in web workers. ...
...nge can be passed, allowing one or multiple records to be deleted from a store. to delete all records in a store, use idbobjectstore.clear. bear in mind that if you are using a idbcursor, you can use the idbcursor.delete() method to more efficiently delete the current record — without having to explicitly look up the record's key. note: this feature is available in web workers. syntax var request = objectstore.delete(key); var request = objectstore.delete(keyrange); parameters key the key of the record to be deleted, or an idbkeyrange to delete all records with keys in range. return value an idbrequest object on which subsequent events related to this operation are fired. the request.result attribute is set to undefined. exceptions this method may raise a domexception of the f...
... dataerror the key is not a valid key or a key range. example in the following code snippet, we open a read/write transaction on our database and delete one specific record out of our object store using delete() — a sample record with the key "walk dog". ...
...And 4 more matches

IDBObjectStore.get() - Web APIs
the get() method of the idbobjectstore interface returns an idbrequest object, and, in a separate thread, returns the object store selected by the specified key. this is for retrieving specific records from an object store. if a value is successfully found, then a structured clone of it is created and set as the result of the request object. note: this method produces the same result for: a) a record that doesn't exist in the database and b) a record that has an undefined value. to tell these situations apart, call the opencursor() method with the same key. that method provides a cursor if the record exists, and no cursor if it does not. note: this feature is available in web workers. ...
... the result of the request object. note: this method produces the same result for: a) a record that doesn't exist in the database and b) a record that has an undefined value. to tell these situations apart, call the opencursor() method with the same key. that method provides a cursor if the record exists, and no cursor if it does not. note: this feature is available in web workers. syntax var request = objectstore.get(key); parameters key the key or key range that identifies the record to be retrieved. return value an idbrequest object on which subsequent events related to this operation are fired. exceptions this method may raise a domexception of one of the following types: exception description transactioninactiveerror this idbobjectstore's transactio...
... on our database and get one specific record from object store using get() — a sample record with the key "walk dog". once this data object is retrieved, you could then update it using normal javascript, then put it back into the database using a idbobjectstore.put operation. ...
...And 4 more matches

IDBObjectStore.openKeyCursor() - Web APIs
if a single valid key is passed, this will default to a range containing only that key. ...
...if a single valid key is passed, this will default to a range containing only that key. ...
...if a single valid key is passed, this will default to a range containing only that key. ...
...And 4 more matches

IDBTransaction: error event - Web APIs
the error event is fired on idbtransaction when a request returns an error and the event bubbles up to the transaction object. ...
... up to the transaction object. ...
... cancelable no interface event event handler property onerror examples this example opens a database and tries to add a record, listening for the error event for the add() operation (this will occur if, for example, a record with the given tasktitle already exists): // open the database const dbopenrequest = window.indexeddb.open('todolist', 4); dbopenrequest.onupgradeneeded = (event) => { const db = event.target.result; // create an objectstore for this database const objectstore = db.createobjectstore('todolist', { keypath: 'tasktitle' }); // define what data items the objectstore will contain objectstore.createindex('hours', 'hours', { unique: false }); objectstore.createindex('minutes', 'minutes', { unique: false }); objectstore.cr...
...And 4 more matches

LocalFileSystemSync - Web APIs
m api gives you access to a sandboxed file system. it is intended to be used with webworkers. the methods are implemented by worker objects. about this document this document was last updated on march 2, 2012 and follows the w3c specifications (working draft) drafted on april 19, 2011. this specification is more or less abandonned, failing to get significant traction. basic concepts you can request access to a sandboxed file system by requesting localfilesystemsync object from within a web worker. the global methods in the window object requestfilesystemsync() and resolvelocalfilesystemsyncurl() methods are exposed to the worker's global scope. calling window.requestfilesystemsync() for creates new storage for your web app. for more concepts, see the counterpart article for the asynchronou...
...object from within a web worker. the global methods in the window object requestfilesystemsync() and resolvelocalfilesystemsyncurl() methods are exposed to the worker's global scope. calling window.requestfilesystemsync() for creates new storage for your web app. for more concepts, see the counterpart article for the asynchronous api. ...
... the global methods in the window object requestfilesystemsync() and resolvelocalfilesystemsyncurl() methods are exposed to the worker's global scope. calling window.requestfilesystemsync() for creates new storage for your web app. for more concepts, see the counterpart article for the asynchronous api. example //taking care of the browser-specific prefix window.requestfilesystemsync = window.requestfilesystemsync || window.webkitrequestfilesystemsync; // the first parameter defines the type of storage: persistent or temporary // next, set the size of space needed (in bytes) // initfs is the success callback // and the last one is the error callback // for denial of access and other errors. ...
...And 4 more matches

PaymentResponse.shippingAddress - Web APIs
the shippingaddress read-only property of the paymentrequest interface returns a paymentaddress object containing the shipping address provided by the user. syntax var shippingaddress = paymentrequest.shippingaddress; value a paymentaddress object providing details comprising the shipping address provided by the user. example generally, the user agent will fill the shippingaddress property for you. you can trigger this by setting paymentoptions.requestshipping to true when calling the paymentrequest constructor. in the example below, the cost of shipping varies by geography. when the paymentrequest.onshippingaddresschange is called, updatedetails() is called to update the details of the paymentrequest, using shippingaddress to set the correct shipping cost. // initialization of paymen...
...ou. you can trigger this by setting paymentoptions.requestshipping to true when calling the paymentrequest constructor. in the example below, the cost of shipping varies by geography. when the paymentrequest.onshippingaddresschange is called, updatedetails() is called to update the details of the paymentrequest, using shippingaddress to set the correct shipping cost. // initialization of paymentrequest arguments are excerpted for brevity. ...
...rue when calling the paymentrequest constructor. in the example below, the cost of shipping varies by geography. when the paymentrequest.onshippingaddresschange is called, updatedetails() is called to update the details of the paymentrequest, using shippingaddress to set the correct shipping cost. // initialization of paymentrequest arguments are excerpted for brevity. var payment = new paymentrequest(supportedinstruments, details, options); request.addeventlistener('shippingaddresschange', function(evt) { evt.updatewith(new promise(function(resolve) { updatedetails(details, request.shippingaddress, resolve); })); }); payment.show().then(function(paymentresponse) { // processing of paymentresponse exerpted for the same of brevity. }).catch(function(err) { console.error("uh oh, so...
...And 4 more matches

PaymentResponse - Web APIs
properties paymentresponse.details read only secure context returns a json-serializable object that provides a payment method specific message used by the merchant to process the transaction and determine successful fund transfer. the contents of the object depend on the payment method being used; for example, if the basic card payment method is used, this object must conform to the structure defined in the basiccardresponse dictionary. ...
...ust conform to the structure defined in the basiccardresponse dictionary. paymentresponse.methodname read only secure context returns the payment method identifier for the payment method that the user selected, for example, visa, mastercard, paypal, etc.. paymentresponse.payeremail read only secure context returns the email address supplied by the user. this option is only present when the requestpayeremail option is set to true in the options parameter of the paymentrequest() constructor. paymentresponse.payername read only secure context returns the name supplied by the user. this option is only present when the requestpayername option is set to true in the options parameter of the paymentrequest() constructor. paymentresponse.payerphone read only secure context returns the phone n...
...paymentrequest() constructor. paymentresponse.payername read only secure context returns the name supplied by the user. this option is only present when the requestpayername option is set to true in the options parameter of the paymentrequest() constructor. paymentresponse.payerphone read only secure context returns the phone number supplied by the user. this option is only present when the requestpayerphone option is set to true in the options parameter of the paymentrequest() constructor. paymentresponse.requestid read only secure context returns the identifier of the paymentrequest that produced the current response. this is the same value supplied in the paymentrequest() constructor by details.id. paymentresponse.shippingaddress read only secure context returns the shipping addres...
...And 4 more matches

Permissions - Web APIs
this is not currently supported in any browser. permissions.revoke() revokes the permission currently set on a given api. ...
...this is not currently supported in any browser. permissions.revoke() revokes the permission currently set on a given api. ...
...this is not currently supported in any browser. permissions.revoke() revokes the permission currently set on a given api. ...
...And 4 more matches

Service Worker API - Web APIs
service workers essentially act as proxy servers that sit between web applications, the browser, and the network (when available). they are intended, among other things, to enable the creation of effective offline experiences, intercept network requests and take appropriate action based on whether the network is available, and update assets residing on the server. they will also allow access to push notifications and background sync apis. ...
...ailable, and update assets residing on the server. they will also allow access to push notifications and background sync apis. service worker concepts and usage a service worker is an event-driven worker registered against an origin and a path. it takes the form of a javascript file that can control the web-page/site that it is associated with, intercepting and modifying navigation and resource requests, and caching resources in a very granular fashion to give you complete control over how your app behaves in certain situations (the most obvious one being when the network is not available). a service worker is run in a worker context: it therefore has no dom access, and runs on a different thread to the main javascript that powers your app, so it is non-blocking. it is designed to be fully asy...
.... a service worker is run in a worker context: it therefore has no dom access, and runs on a different thread to the main javascript that powers your app, so it is non-blocking. it is designed to be fully async; as a consequence, apis such as synchronous xhr and localstorage can't be used inside a service worker. service workers only run over https, for security reasons. having modified network requests, wide open to man in the middle attacks would be really bad. in firefox, service worker apis are also hidden and cannot be used when the user is in private browsing mode. note: service workers win over previous attempts in this area such as; appcache because they don't make assumptions about what you are trying to do, and then break when those assumptions are not exactly right; you have granul...
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Ajax - Developer guides
getting started an introduction to ajax. asynchronous javascript and xml, while not a technology in itself, is a term coined in 2005 by jesse james garrett, that describes a "new" approach to using a number of existing technologies together, including html or xhtml, css, javascript, dom, xml, xslt, and most importantly the xmlhttprequest object. when these technologies are combined in the ajax model, web applications are able to make quick, incremental updates to the user interface without reloading the entire browser page. this makes the application faster and more responsive to user actions. although x in ajax stands for xml, json is used more than xml nowadays because of its many advantages such as being lighter and a part of javascript. both json and xml are used for packaging inf...
... actions. although x in ajax stands for xml, json is used more than xml nowadays because of its many advantages such as being lighter and a part of javascript. both json and xml are used for packaging information in the ajax model. documentation getting started this article guides you through the ajax basics and gives you two simple hands-on examples to get you started. ...
... ajax stands for xml, json is used more than xml nowadays because of its many advantages such as being lighter and a part of javascript. both json and xml are used for packaging information in the ajax model. documentation getting started this article guides you through the ajax basics and gives you two simple hands-on examples to get you started. using the xmlhttprequest api the xmlhttprequest api is the core of ajax. this article will explain how to use some ajax techniques, like: analyzing and manipulating the response of the server monitoring the progress of a request submitting forms and upload binary files – in pure ajax, or using formdata objects using ajax within web workers fetch api the fetch api provides an interface for fetching resources. it will seem fami...
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CORS errors - HTTP
cross-origin resource sharing (cors) is a standard that allows a server to relax the same-origin policy. this is used to explicitly allow some cross-origin requests while rejecting others. for example, if a site offers an embeddable service, it may be necessary to relax certain restrictions. setting up such a cors configuration isn't necessarily easy and may present some challenges. in these pages, we'll look into some common cors error messages and how to resolve them. if the cors configuration isn't setup correctly, the browser console will present an error like "cross-origin request blocked: the same origin policy disallows reading the remote resource at $somesite" indicating that the request was blocked due to violating the cors security rules. this might not necessarily be a set-up mistake...
...r messages and how to resolve them. if the cors configuration isn't setup correctly, the browser console will present an error like "cross-origin request blocked: the same origin policy disallows reading the remote resource at $somesite" indicating that the request was blocked due to violating the cors security rules. this might not necessarily be a set-up mistake, though. it's possible that the request is in fact intentionally being disallowed by the user's web application and remote external service. however, if the endpoint is meant to be available, some debugging is needed to succeed. identifying the issue to understand the underlying issue with the cors configuration, you need to find out which request is at fault and why. these steps may help you do so: navigate to the web site or web...
...all the code knows is that an error occurred. ...
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Content negotiation - HTTP
, which language of a document, which image format, or which content encoding). note: some disadvantages of http content negotiation are explained in a wiki page from whatwg. html5 provides alternatives to content negotiation via, for example, the <source> element. principles of content negotiation a specific document is called a resource. when a client wants to obtain a resource, the client requests it using its url. the server uses this url to choose one of the variants it provides – each variant being called a representation – and returns a specific representation to the client. the overall resource, as well as each of the representations, have a specific url. how a specific representation is chosen when the resource is called is determined by content negotiation and there are several...
...he algorithm is server-specific and not defined in the standard. see, for example, the apache negotiation algorithm. the http/1.1 standard defines list of the standard headers that start server-driven negotiation (accept, accept-charset, accept-encoding, accept-language). though strictly speaking user-agent is not in this list, it is sometimes also used to send a specific representation of the requested resource, though this is not considered as a good practice. the server uses the vary header to indicate which headers it actually used for content negotiation (or more precisely the associated response headers), so that caches can work optimally. in addition to these, there is an experimental proposal to add more headers to the list of available headers, called client hints. client hints adver...
...uld stick with the explicitly-chosen language. in other words, only entry pages of a site should select the proper language using this header. the user-agent header though there are legitimate uses of this header for selecting content, it is considered bad practice to rely on it to define what features are supported by the user agent. the user-agent header identifies the browser sending the request. this string may contain a space-separated list of product tokens and comments. a product token is a name followed by a '/' and a version number, like firefox/4.0.1. there may be as many of them as the user-agent wants. a comment is a free string delimited by parentheses. obviously parentheses cannot be used in that string. the inner format of a comment is not defined by the standard, though sev...
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Host - HTTP
<port> optional tcp port number on which the server is listening. ...
... <port> optional tcp port number on which the server is listening. ...
... <port> optional tcp port number on which the server is listening. ...
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Basic Example - XSLT: Extensible Stylesheet Language Transformations
the .xsl file is then imported (xsltprocessor.importstylesheet(xslstylesheet)) and the transformation run (xsltprocessor.transformtofragment(xmldoc, document)). this allows fetching of data after the page has been loaded, without initiating a fresh page load. figure 6 : example var xslstylesheet; var xsltprocessor = new xslt...
...rocessor.importstylesheet(xslstylesheet)) and the transformation run (xsltprocessor.transformtofragment(xmldoc, document)). this allows fetching of data after the page has been loaded, without initiating a fresh page load. ...
...heet(xslstylesheet)) and the transformation run (xsltprocessor.transformtofragment(xmldoc, document)). this allows fetching of data after the page has been loaded, without initiating a fresh page load. ...
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indexed-db - Archive of obsolete content
experimental exposes the indexeddb api to add-ons. usage scripts running in web pages can access indexeddb via the window object. for example: window.indexeddb = window.indexeddb || window.webkitindexeddb || window.mozindexeddb || window.msindexeddb; var request = window.indexeddb.open("mydatabase"); request.onerror = function(event) { console.log("failure"); }; request.onsuccess = function(event) { console.log("success"); }; because your main add-on code can't access the dom, you can't do this. ...
...exeddb || window.msindexeddb; var request = window.indexeddb.open("mydatabase"); request.onerror = function(event) { console.log("failure"); }; request.onsuccess = function(event) { console.log("success"); }; because your main add-on code can't access the dom, you can't do this. so you can use the indexed-db module to access the same api: var { indexeddb } = require('sdk/indexed-db'); var request = indexeddb.open('mydatabase'); request.onerror = function(event) { console.log("failure"); }; request.onsuccess = function(event) { console.log("success"); }; most of the objects that implement the indexeddb api, such as idbtransaction, idbopendbrequest, and idbobjectstore, are accessible through the indexeddb object itself. the api exposed by indexed-db is almost identical to the dom inde...
...the button labeled "list" lists all the titles in the database. the add-on implements helper functions open(), additem() and getitems() to open the database, add a new item to the database, and get all items in the database. ...
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Creating a dynamic status bar extension - Archive of obsolete content
10 minutes (the time interval is specified in milliseconds). refreshinformation() the refreshinformation() function is called whenever we want to update the stock information. it's called whenever the user clicks on the status bar panel, when our extension is first added to a browser window, and by the interval handler to periodically update the display. ...
... called whenever we want to update the stock information. it's called whenever the user clicks on the status bar panel, when our extension is first added to a browser window, and by the interval handler to periodically update the display. refreshinformation: function() { var httprequest = null; var fullurl = 'http://quote.yahoo.com/d/quotes.csv?f=sl1d1t1c1ohgv&e=.csv&s=goog'; // ... httprequest = new xmlhttprequest(); httprequest.open('get', fullurl, true); httprequest.onload = inforeceived; httprequest.send(null); } the httprequest variable will contain an xmlhttprequest object. this object is used to configure and run an http request on a web server, which we'll use to fetch the stock quote data. the fullurl variable is the complete url to use when requesting a stock quote. in...
...l use to fetch the stock quote data. the fullurl variable is the complete url to use when requesting a stock quote. in this case, we're using yahoo's comma-separated values return to fetch easily-parsed stock quote data for google (ticker symbol goog). refreshinformation() embeds another function, inforeceived(), which we'll look at separately shortly. the first thing we do is create a new xmlhttprequest object to use for processing our request. we open the request, specifying that we wish to perform an http "get" command with the url fullurl. the true boolean value in the third parameter indicates that we want to process the request asynchronously. ...
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Microsummary topics - Archive of obsolete content
bute to urn:source:sourceurl, where sourceurl is the url from which the generator was downloaded. in the future, firefox may access source urls to download updated versions of generators, so unless you are installing generators which are available from urls, you should not use this form for your programmatically-installed generators. differentiating between user-initiated and microsummary-related requests when firefox updates a microsummary generated by a microsummary generator add-on, it automatically downloads the html content of the page being summarized. it does not generally download related content like embedded images and javascript scripts referenced by the page. however, because of a technical limitation (bug 340746), it does download css stylesheets referenced by the page. firefox inclu...
... updates a microsummary generated by a microsummary generator add-on, it automatically downloads the html content of the page being summarized. it does not generally download related content like embedded images and javascript scripts referenced by the page. however, because of a technical limitation (bug 340746), it does download css stylesheets referenced by the page. firefox includes the x-moz request header with these requests. it sets the value of the header to the string microsummary. thus, to differentiate requests initiated manually by users for the purpose of viewing a web page from those initiated automatically by firefox for the purpose of summarizing that page, check for the presence and value of the x-moz request header. if the x-moz header is present, and its value is microsummary, ...
...ith these requests. it sets the value of the header to the string microsummary. thus, to differentiate requests initiated manually by users for the purpose of viewing a web page from those initiated automatically by firefox for the purpose of summarizing that page, check for the presence and value of the x-moz request header. if the x-moz header is present, and its value is microsummary, then the request is a microsummary-related request. otherwise, it is a user-initiated request. controlling the frequency of microsummary requests when firefox downloads content in order to update a microsummary, it honors cache-related http response headers. ...
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NPP_NewStream - Archive of obsolete content
npbool seekable, uint16* stype); parameters the function has the following parameters: instance pointer to current plug-in instance. type pointer to mime type of the stream. stream pointer to new stream. seekable boolean indicating whether the stream is seekable: true: seekable. stream supports random access through calls to npn_requestread (for example, local files or http servers that support byte-range requests). false: not seekable. the browser must copy data in the stream to the local cache to satisfy random access requests made through npn_requestread. stype out parameter. the plugin should set this value to request a mode for the stream. for more information about each of these values, see directions in this se...
...(default): delivers stream data to the instance in a series of calls to npp_writeready and npp_write. np_asfileonly: saves stream data to a file in the local cache. np_asfile: file download. like np_asfileonly except that data is delivered to the plug-in as it is saved to the file (as in mode np_normal). np_seek: stream data randomly accessible by the plug-in as needed, through calls to npn_requestread. implementation note: some plugins, notably silverlight, do not set this outparam, and rely on the outparam being initialized to a default np_normal value. returns if successful, the function should return nperr_no_error. if unsuccessful, the function should return one of the nperror error codes. this will cause the browser to destroy the stream without calling npp_destroystream.
...eated. the npstream* pointer is valid until the stream is destroyed. the plug-in can store plug-in-private data associated with the stream in stream->pdata. the mime type of the stream is provided by the type parameter. the data in the stream can be the file specified in the src attribute of the embed tag, for an embedded instance, or the file itself, for a full-page instance. a plug-in can also request a stream with the function npn_geturl. the browser calls npp_destroystream when the stream completes (either successfully or abnormally). the plug-in can terminate the stream itself by calling npn_destroystream. the parameter stype defines the mode of the stream. values: np_normal (default): delivers stream data to the instance in a series of calls to npp_writeready and npp_write. the plug-in...
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Introduction to SSL - Archive of obsolete content
he secure sockets layer (ssl) protocol. ssl has been universally accepted on the world wide web for authenticated and encrypted communication between clients and servers. the ssl protocol ciphers used with ssl the ssl handshake the new internet engineering task force (ietf) standard protocol called transport layer security (tls) is based on ssl. the details of the protocol are available in request for comments (rfc): 2246,the tls protocol version 1.0. some red hat products already support tls. most other red hat products plan to support the protocol in future versions. this document is primarily intended for administrators of red hat server products, but the information it contains may also be useful for developers of applications that support ssl. the document assumes that you are famili...
...client's ssl version number, cipher settings, randomly generated data, and other information the server needs to communicate with the client using ssl. the server sends the client the server's ssl version number, cipher settings, randomly generated data, and other information the client needs to communicate with the server over ssl. the server also sends its own certificate and, if the client is requesting a server resource that requires client authentication, requests the client's certificate. the client uses some of the information sent by the server to authenticate the server (for details, see "server authentication"). if the server cannot be authenticated, the user is warned of the problem and informed that an encrypted and authenticated connection cannot be established. if the server can b...
...authenticated, the client goes on to step 4. using all data generated in the handshake so far, the client (with the cooperation of the server, depending on the cipher being used) creates the premaster secret for the session, encrypts it with the server's public key (obtained from the server's certificate, sent in step 2), and sends the encrypted premaster secret to the server. ...
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Index - Learn web development
b page does more than just sit there and display static information for you to look at—displaying timely content updates, interactive maps, animated 2d/3d graphics, scrolling video jukeboxes, or more—you can bet that javascript is probably involved. ...
...we'll probably add to this resource as time goes on. ...
...erent coding techniques and features we've discussed throughout, looking at which one you should use when, with recommendations and reminders of common pitfalls where appropriate. we'll probably add to this resource as time goes on. 51 cooperative asynchronous javascript: timeouts and intervals animation, beginner, codingscripting, guide, intervals, javascript, loops, asynchronous, requestanimationframe, setinterval, settimeout, timeouts this tutorial looks at the traditional methods javascript has available for running code asychronously after a set time period has elapsed, or at a regular interval (e.g. a set number of times per second), discusses what they are useful for, and considers their inherent issues. 52 general asynchronous programming concepts javas...
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Introduction to automated testing - Learn web development
your favourite environment, be it php, java, node.js, etc. let's have a brief look at how we'd access the api using node.js. first, set up a new npm project to test this out, as detailed in setting up node and npm. use a different directory name than before, like bstack-test for example. create a new file inside your project root called call_bstack.js. ...
...ronment, be it php, java, node.js, etc. let's have a brief look at how we'd access the api using node.js. first, set up a new npm project to test this out, as detailed in setting up node and npm. use a different directory name than before, like bstack-test for example. create a new file inside your project root called call_bstack.js. ...
...different directory name than before, like bstack-test for example. create a new file inside your project root called call_bstack.js. ...
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Storage access policy: Block cookies from trackers
rces identified as trackers from accessing their cookies and other site storage when they are loaded in a third-party context. this prevents those resources from retrieving tracking identifiers stored in cookies or site storage and using them to identify users across visits to multiple first parties. specifically, firefox does this by imposing the following restrictions: cookies: block cookie request headers and ignore set-cookie response headers. return an empty string for calls to document.cookie and ignore requests to set cookies via document.cookie. dom storage: localstorage: window.localstorage: read and write attempts throw a securityerror exception. prior to firefox 70: window.localstorage is null. thus, attempts to read and write using this object will throw a typeerror excepti...
...h top-level origin will have a separate partition and tracking resources on different top-level origins will be cached separate from each other. network connections: tls sessions will not be resumed using a session ticket when an https connection is made to an embedded third-party resource that is classified as a tracker. http connection reuse by domains classified as trackers is limited to requests that occur under the same top-level origin. for example, a request for content from tracker.example on news.example will not reuse an http connection with a request for content from tracker.example on shopping.example or with requests that occur when tracker.example is visited directly (i.e., as a first party). http referrers the default referrer policy for third-party resources classified ...
...cribed in this section. currently, firefox includes some web compatibility heuristics that grant storage access to third-party resources classified as trackers when a user interacts with those third parties. we do this when we expect that not granting access would cause the web page to break. we also support an initial implementation of the storage access api, through which embedded <iframe>s can request storage access by calling document.requeststorageaccess(). although both of these approaches provide the same level of storage access, we recommend third parties switch to using the storage access api in order to guarantee their access to storage. automatic storage access upon interaction in order to improve web compatibility, firefox currently includes some heuristics to grant storage access a...
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HTMLIFrameElement.download()
parameters url the url of the file to be downloaded. options optional an options object allowing optional settings to be specified for the download. ...
... parameters url the url of the file to be downloaded. options optional an options object allowing optional settings to be specified for the download. ...
... parameters url the url of the file to be downloaded. options optional an options object allowing optional settings to be specified for the download. ...
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Overview of Mozilla embedding APIs
nto a ucs2 string. typically, instances of this class are stack allocated, and wrap ascii arguments which must be converted into ucs2. do_queryinterface this is a helper class which works in conjunction with nscomptr to perform a simplified call to nsisupports::queryinterface(...) with a typesafe assignment. do_getinterface this function simplfies retrieving interfaces via the nsiinterfacerequestor::getinterface(...) method. using this function, one can use nsisupports instances and still easily access other interfaces via nsiinterfacerequestor. internally, this function tries to convert the nsisupports argument into an nsiinterfacerequestor and then calls getinterface(...) to retrieve the requested interface. do_queryreferent this function is the equivilent of do_queryinterface excep...
...of using the nscomtypeinfo template directly. ns_getweakreference this function creates a weak reference to a component which implements the nsiweakreference interface. global services nsservicemanager the service manager is the central repository for accessing instances of the various xpcom services. each service is represented by a singleton object which is instantiated the first time it is requested and remains alive until the service manager is shut down, or the service is explicitly unloaded. through the service manager, individual services can be loaded, unloaded and accessed. implemented interfaces: nsiservicemanager related interfaces: nsishutdownlistener nsmemory the nsmemory service provides the global memory manager implementation for xpcom. in addition to memory allocation...
...terfaces: nsimemory related interfaces: nsiobserver nscomponentmanager the nscomponentmanager service is responsible for creating new instances of xpcom components. the component manager is also responsible for registering and managing the class factories used for component creation... contract-id: ns_componentmanager_contractid implemented interfaces: nsicomponentmanager nsiinterfacerequestor requestor interfaces: nsiservicemanager related interfaces: nsifactory nsuriloader the nsuriloader service is responsible for targeting a uri at an appropriate content handler. a content handler may be an existing or new window, a helper application or the unknown content handler - if no other handler can be found for the content-type. contract-id: ns_uri_loader_contractid implemented ...
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Localization technical reviews
the technical review process we use for new localizations can be confusing for any trying to start a new localization. we use this review process to perform quality assurance (qa) testing on your l10n efforts. this ensures that every user who downloads your localized mozilla application receives all of your hard work in a functional product. ...
...atorbeforeaccesskeys = true, where "true" should be left untranslated. inspect firefox-l10n.js we ensure that there are no odd preferences, or #filter substitutions for general.useragent.locale. most locales should have the following: #filter substitution pref("general.useragent.locale", "@ab_cd@") how it all works a large part of the review process takes place before you even submit your request for a technical review. to put it simply, when we receive your request, we expect that you have spent time testing your work and making sure all strings have been localized and that your language pack is relatively functional. your review request symbolically represents that you have worked on your localization, tested it successfully, and found it to represent the best of your work. so before yo...
... attach your files to the bug. once attached, open the attachment details. ...
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Certificate functions
validitytimes mxr 3.11 and later cert_completecrldecodeentries mxr 3.6 and later cert_convertanddecodecertificate mxr 3.9.3 and later cert_copyname mxr 3.4 and later cert_copyrdn mxr 3.5 and later cert_createava mxr 3.2.1 and later cert_createcertificate mxr 3.5 and later cert_createcertificaterequest mxr 3.2 and later cert_createname mxr 3.2.1 and later cert_createocspcertid mxr 3.6 and later cert_createocsprequest mxr 3.6 and later cert_createrdn mxr 3.2.1 and later cert_createsubjectcertlist mxr 3.4 and later cert_createvalidity mxr 3.5 and later cert_crlcacherefreshissuer mxr 3.7 ...
....4 and later cert_decodeusernotice mxr 3.2 and later cert_dernametoascii mxr 3.4 and later cert_destroycertarray mxr 3.2 and later cert_destroycertificate mxr 3.2 and later cert_destroycertificatelist mxr 3.2 and later cert_destroycertificatepoliciesextension mxr 3.2 and later cert_destroycertificaterequest mxr 3.2 and later cert_destroycertlist mxr 3.2 and later cert_destroyname mxr 3.2 and later cert_destroyocspcertid mxr 3.6 and later cert_destroyocsprequest mxr 3.6 and later cert_destroyocspresponse mxr 3.7 and later cert_destroyoidsequence mxr 3.9 and later cert_destroyusernotice mxr 3...
... cert_encodecertpoliciesextension mxr 3.12 and later cert_encodecrldistributionpoints mxr 3.5 and later cert_encodegeneralname mxr 3.4 and later cert_encodeinfoaccessextension mxr 3.12 and later cert_encodeinhibitanyextension mxr 3.12 and later cert_encodenoticereference mxr 3.12 and later cert_encodeocsprequest mxr 3.6 and later cert_encodepolicyconstraintsextension mxr 3.12 and later cert_encodepolicymappingextension mxr 3.12 and later cert_encodesubjectkeyid mxr 3.12 and later cert_encodeusernotice mxr 3.12 and later cert_extractpublickey mxr 3.2 and later cert_findcertbyname mxr 3.2 and later cert...
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Python binding for NSS
there is a bug in nss which hides the existence of extensions in a csr if the extensions are not contained in the first csr attribute. this was fixable in python-nss without requiring a patch to nss. formerly python-nss did not provide access to the attributes in a csr only the extensions, with this release all components of a csr can be acc...
... release 0.15.0 release date 2014-09-09 scm tag pynss_release_0_15_0 source download https://ftp.mozilla.org/pub/mozilla.org/security/python-nss/releases/pynss_release_0_15_0/src/ change log the primary enhancements in this version was fixing access to extensions in a certificaterequest and giving access to certificaterequest attributes. ...
... add ability to read pem data from a string. add more build instructions to readme. source readme into package long description. a secitem now converts almost all der encoded data to a string when it's str method is invoked, formerly it was limited to only a few objects. ...
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NSS functions
validitytimes mxr 3.11 and later cert_completecrldecodeentries mxr 3.6 and later cert_convertanddecodecertificate mxr 3.9.3 and later cert_copyname mxr 3.4 and later cert_copyrdn mxr 3.5 and later cert_createava mxr 3.2.1 and later cert_createcertificate mxr 3.5 and later cert_createcertificaterequest mxr 3.2 and later cert_createname mxr 3.2.1 and later cert_createocspcertid mxr 3.6 and later cert_createocsprequest mxr 3.6 and later cert_createrdn mxr 3.2.1 and later cert_createsubjectcertlist mxr 3.4 and later cert_createvalidity mxr 3.5 and later cert_crlcacherefreshissuer mxr 3.7 ...
....4 and later cert_decodeusernotice mxr 3.2 and later cert_dernametoascii mxr 3.4 and later cert_destroycertarray mxr 3.2 and later cert_destroycertificate mxr 3.2 and later cert_destroycertificatelist mxr 3.2 and later cert_destroycertificatepoliciesextension mxr 3.2 and later cert_destroycertificaterequest mxr 3.2 and later cert_destroycertlist mxr 3.2 and later cert_destroyname mxr 3.2 and later cert_destroyocspcertid mxr 3.6 and later cert_destroyocsprequest mxr 3.6 and later cert_destroyocspresponse mxr 3.7 and later cert_destroyoidsequence mxr 3.9 and later cert_destroyusernotice mxr 3...
... cert_encodecertpoliciesextension mxr 3.12 and later cert_encodecrldistributionpoints mxr 3.5 and later cert_encodegeneralname mxr 3.4 and later cert_encodeinfoaccessextension mxr 3.12 and later cert_encodeinhibitanyextension mxr 3.12 and later cert_encodenoticereference mxr 3.12 and later cert_encodeocsprequest mxr 3.6 and later cert_encodepolicyconstraintsextension mxr 3.12 and later cert_encodepolicymappingextension mxr 3.12 and later cert_encodesubjectkeyid mxr 3.12 and later cert_encodeusernotice mxr 3.12 and later cert_extractpublickey mxr 3.2 and later cert_findcertbyname mxr 3.2 and later cert...
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How to embed the JavaScript engine
tystub, js_propertystub, js_strictpropertystub, js_enumeratestub, js_resolvestub, js_convertstub, }; int main(int argc, const char *argv[]) { jsruntime *rt = js_newruntime(8l * 1024 * 1024, js_use_helper_threads); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext. jsautorequest ar(cx); // in practice, you would want to exit this any // time you're spinning the event loop js::rootedobject global(cx, js_newglobalobject(cx, &global_class, nullptr)); if (!global) return 1; js::rootedvalue rval(cx); { // scope...
... js_convertstub, nullptr, nullptr, nullptr, nullptr, js_globalobjecttracehook }; int main(int argc, const char *argv[]) { js_init(); jsruntime *rt = js_newruntime(8l * 1024 * 1024, js_use_helper_threads); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext. jsautorequest ar(cx); // in practice, you would want to exit this any // time you're spinning the event loop js::rootedobject global(cx, js_newglobalobject(cx, &global_class, nullptr, js::fireonnewglobalhook)); if (!global) return 1; js::rootedvalue rv...
...ptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, js_globalobjecttracehook }; int main(int argc, const char *argv[]) { js_init(); jsruntime *rt = js_newruntime(8l * 1024 * 1024); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext. jsautorequest ar(cx); // in practice, you would want to exit this any // time you're spinning the event loop js::rootedobject global(cx, js_newglobalobject(cx, &global_class, nullptr, js::fireonnewglobalhook)); if (!global) return 1; js::rootedvalue rv...
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XPCOM Stream Guide
et you know when there is data in a stream ready for you to consume. most streams are asynchronous: they make no assumptions that all the data a resource provides is available immediately. (this is particularly true of streams that reach out over a network connection, like http and ftp channels.) stream listeners implement three methods. ...
...s is particularly true of streams that reach out over a network connection, like http and ftp channels.) stream listeners implement three methods. from the nsistreamlistener interface, the .ondataavailable(request, context, inputstream, offset, count) method gives you the input stream and the number of bytes available. the stream listener must read exactly count bytes before exiting. from the nsirequestobserver interface, the .onstartrequest(request, context) method tells you when the request begins, while the .onstoprequest(request, context) method tells you when the request ends. a request will have one .onstartrequest(request, context) call, followed by at least one .ondataavailable(...) call, followed by one .onstoprequest(request, context) call. the context argument will be something passe...
... seekable streams some streams are "seekable": they let you specify where in the stream you are reading from (instead of requiring it be from the beginning). ...
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Components.isSuccessCode
, if you are using asynchronous apis, it may be essential. for example, if you ask a component or service to asynchronously perform some task, you must usually pass in an object which will be notified when the task is completed. if the task is sufficiently complex that it can fail, the notification will include a status code indicating the success or failure of the operation (see, for example, nsirequestobserver.onstoprequest()). to determine the success or failure of the complex task, you would call components.issuccesscode() upon the status code included in the notification. examples checking whether copying a stream's data succeeded the following example demonstrates copying data from a buffered nsiinputstream to an nsioutputstream, checking for whether the copy succeeded using components.i...
...syncstreamcopier.init() has changed in gecko 1.9.2, omit last 2 boolean parameters if you're using gecko 1.9.1 and earlier. ...
...nit() has changed in gecko 1.9.2, omit last 2 boolean parameters if you're using gecko 1.9.1 and earlier. ...
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nsIIOService
nt32_t asecurityflags, in uint32_t acontentpolicytype, ); parameters aspec the spec for the desired uri. aorigincharset the charset for the uri. may be null. abaseuri the base uri for the spec. may be null. if aspec is an absolute url, this parameter is ignored. aloadingnode the loadingdocument of the channel. this is the document/element that will get access to the result of this request. ...
...ment of the channel. this is the document/element that will get access to the result of this request. for example for an image load, it's the document in which the image will be loaded. and for a css stylesheet it's the document whose rendering will be affected by the stylesheet. if possible, pass in the element which is performing the load. but if the load is coming from a js api (such as xmlhttprequest) or if the load might be coalesced across multiple elements (such as for ) then pass in the document node instead. for loads that are not related to any document, such as loads coming from addons or internal browser features, use null here. aloadingprincipal the loadingprincipal of the channel. the principal of the document where the result of this request will be used. this defaults to the pri...
...cipal, then loadingprincipal must be equal to loadingnode->nodeprincipal(). but less error prone is to just supply a loadingnode. keep in mind that uris coming from a webpage should never use the systemprincipal as the loadingprincipal. parameters auri an nsiuri from which to make a channel. aloadingnode the loadingdocument of the channel. the element or document where the result of this request will be used. this is the document/element that will get access to the result of this request. for example for an image load, it's the document in which the image will be loaded. and for a css stylesheet it's the document whose rendering will be affected by the stylesheet. if possible, pass in the element which is performing the load. but if the load is coming from a js api (such as xmlhttpreques...
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XPCOM Interface Reference
ibleeditabletextiaccessiblehyperlinkiaccessiblehypertextiaccessibleimageiaccessiblerelationiaccessibletableiaccessibletable2iaccessibletablecelliaccessibletextiaccessiblevalueidispatchijsdebuggeramiinstallcallbackamiinstalltriggeramiwebinstallinfoamiwebinstalllisteneramiwebinstallpromptamiwebinstallerimgicacheimgicontainerimgicontainerobserverimgidecoderimgidecoderobserverimgiencoderimgiloaderimgirequestinidomutilsjsdistackframemoziasyncfaviconsmoziasynchistorymozicoloranalyzermozijssubscriptloadermozipersonaldictionarymoziplaceinfomoziplacesautocompletemoziregistrymozirepresentativecolorcallbackmozispellcheckingenginemozistorageaggregatefunctionmozistorageasyncstatementmozistoragebindingparamsmozistoragebindingparamsarraymozistoragecompletioncallbackmozistorageconnectionmozistorageerrormozistora...
...viewernsicontrollernsicontrollersnsiconverterinputstreamnsiconverteroutputstreamnsicookiensicookie2nsicookieacceptdialognsicookieconsentnsicookiemanagernsicookiemanager2nsicookiepermissionnsicookiepromptservicensicookieservicensicookiestoragensicrashreporternsicryptohmacnsicryptohashnsicurrentcharsetlistenernsicyclecollectorlistenernsidbchangelistenernsidbfolderinfonsidnslistenernsidnsrecordnsidnsrequestnsidnsservicensidomcanvasrenderingcontext2dnsidomchromewindownsidomclientrectnsidomdesktopnotificationnsidomdesktopnotificationcenternsidomelementnsidomeventnsidomeventgroupnsidomeventlistenernsidomeventtargetnsidomfilensidomfileerrornsidomfileexceptionnsidomfilelistnsidomfilereadernsidomfontfacensidomfontfacelistnsidomgeogeolocationnsidomgeopositionnsidomgeopositionaddressnsidomgeopositioncallbac...
...sihtmleditornsihttpheaderlistenernsihapticfeedbacknsihttpactivitydistributornsihttpactivityobservernsihttpchannelnsihttpchannelinternalnsihttpheadervisitornsihttpservernsihttpupgradelistenernsiidnservicensiiframeboxobjectnsiiniparsernsiiniparserfactorynsiiniparserwriternsiioservicensiidleservicensiinprocesscontentframemessagemanagernsiinputstreamnsiinputstreamcallbacknsiinstalllocationnsiinterfacerequestornsijscidnsijsidnsijsiidnsijsonnsijetpacknsijetpackservicensijumplistbuildernsijumplistitemnsilivemarkservicensiloadgroupnsilocalfilensilocalfilemacnsilocalensilocaleservicensilogininfonsiloginmanagernsiloginmanagercryptonsiloginmanageriemigrationhelpernsiloginmanagerprompternsiloginmanagerstoragensiloginmetainfonsimimeinputstreamnsimacdocksupportnsimarkupdocumentviewernsimemorynsimemorymultirepo...
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Network Monitor - Firefox Developer Tools
the network monitor shows you all the network requests firefox makes (for example, when it loads a page, or due to xmlhttprequests), how long each request takes, and details of each request. opening the network monitor there are a few different ways to open the network monitor: press ctrl + shift + e ( command + option + e on a mac). select "network" from the web developer menu, (which is a submenu of the tools menu on os x and linux). click the wrench icon (), which is in the main toolbar or under the hamburger menu (), then select "network". the network monitor will appear at the bottom of the browser window. when it first opens, the network monitor does not show request information. the just opened tool looks like this: either action causes the network monitor to begin monitoring...
...nch icon (), which is in the main toolbar or under the hamburger menu (), then select "network". the network monitor will appear at the bottom of the browser window. when it first opens, the network monitor does not show request information. the just opened tool looks like this: either action causes the network monitor to begin monitoring network activity. once the tool is monitoring network requests, the display looks like this: when it is actively monitoring activity, the network monitor records network requests any time the toolbox is open, even if the network monitor itself is not selected. this means you can start debugging a page in, for example, the web console, then switch to the network monitor to see network activity without having to reload the page. ui overview the ui is div...
...etwork monitor records network requests any time the toolbox is open, even if the network monitor itself is not selected. this means you can start debugging a page in, for example, the web console, then switch to the network monitor to see network activity without having to reload the page. ...
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BasicCardResponse.billingAddress - Web APIs
the billingaddress property of the basiccardresponse dictionary contains the billing address of the card used to make the payment. syntax "billingaddress" : paymentaddress value a paymentaddress object representing the billing address of the card. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. ...
...he basiccardresponse dictionary contains the billing address of the card used to make the payment. syntax "billingaddress" : paymentaddress value a paymentaddress object representing the billing address of the card. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. request.show().then(function(instrumentresponse) { // do something with the response from the ui. ...
...of the card. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. request.show().then(function(instrumentresponse) { // do something with the response from the ui. console.log(instrumentresponse.details); }) .catch(function(err) { // do something with the error from request.show(). }); once the payment flow has been triggered using paymentrequest.show() and the promise resolves successfully, the paymentresponse object available inside the fulfilled promise (instrumentresponse above) will have a paymentresponse.details property that will contain response details. this has to conform to the structure defined by the basiccardresponse dictionary, and may look something...
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BasicCardResponse.expiryMonth - Web APIs
the expirymonth property of the basiccardresponse dictionary contains the expiry month of the card used to make the payment. syntax "expirymonth" : "number" value a domstring representing the card expiry month as a two-digit number in the range 01 to 12. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. ...
...rdresponse dictionary contains the expiry month of the card used to make the payment. syntax "expirymonth" : "number" value a domstring representing the card expiry month as a two-digit number in the range 01 to 12. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. request.show().then(function(instrumentresponse) { // do something with the response from the ui. ...
...ge 01 to 12. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. request.show().then(function(instrumentresponse) { // do something with the response from the ui. console.log(instrumentresponse.details); }) .catch(function(err) { // do something with the error from request.show(). }); once the payment flow has been triggered using paymentrequest.show() and the promise resolves successfully, the paymentresponse object available inside the fulfilled promise (instrumentresponse above) will have a paymentresponse.details property that will contain response details. this has to conform to the structure defined by the basiccardresponse dictionary, and may look something...
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BasicCardResponse.expiryYear - Web APIs
the expiryyear property of the basiccardresponse dictionary contains the expiry year of the card used to make the payment. syntax "expiryyear" : "number" value a domstring representing the card expiry year as a four-digit number in the range 0000 to 9999. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. ...
...response dictionary contains the expiry year of the card used to make the payment. syntax "expiryyear" : "number" value a domstring representing the card expiry year as a four-digit number in the range 0000 to 9999. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. request.show().then(function(instrumentresponse) { // do something with the response from the ui. ...
...000 to 9999. example let's look at a sample payment request: var request = new paymentrequest(supportedinstruments, details, options); // call show() to trigger the browser's payment flow. request.show().then(function(instrumentresponse) { // do something with the response from the ui. console.log(instrumentresponse.details); }) .catch(function(err) { // do something with the error from request.show(). }); once the payment flow has been triggered using paymentrequest.show() and the promise resolves successfully, the paymentresponse object available inside the fulfilled promise (instrumentresponse above) will have a paymentresponse.details property that will contain response details. this has to conform to the structure defined by the basiccardresponse dictionary, and may look something...
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Cache.delete() - Web APIs
options optional an object whose properties control how matching is done in the delete operation. the available options are: ignoresearch: a boolean that specifies whether the matching process should ignore the query string in the url. ...
... options optional an object whose properties control how matching is done in the delete operation. the available options are: ignoresearch: a boolean that specifies whether the matching process should ignore the query string in the url. ...
... options optional an object whose properties control how matching is done in the delete operation. the available options are: ignoresearch: a boolean that specifies whether the matching process should ignore the query string in the url. ...
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