nsIScriptError
js/xpconnect/idl/nsiscripterror.idlscriptable represents javascript errors and warnings for use by the console service. 66 introduced gecko 1.0 inherits from: nsiconsolemessage last changed in gecko 1.9 (firefox 3) implemented by: @mozilla.org/scripterror;1. to create an instance, use: var scripterror = components.classes["@mozilla.org/scripterror;1"] .createinstance(components.interfaces.nsiscripterror); note: the nsiscripterror2 interface was merged into this interface in gecko 12.0. prior to that release, if you wanted to associate an outer window with a script error, you had to use nsiscripterror2 instead. ...
...tance, use: var scripterror = components.classes["@mozilla.org/scripterror;1"] .createinstance(components.interfaces.nsiscripterror); note: the nsiscripterror2 interface was merged into this interface in gecko 12.0. prior to that release, if you wanted to associate an outer window with a script error, you had to use nsiscripterror2 instead. that subclass offered the nsiscripterror.initwithwindowid() method for that purpose; that method is now available in this interface, however. method overview void init(in wstring message, in wstring sourcename, in wstring sourceline, in pruint32 linenumber, in pruint32 columnnumber, in pruint32 flags, in string category); void initwithwindowid(in wstring message, in wstring sourcename, in wstring sourceline, in prui...
...ing category); void initwithwindowid(in wstring message, in wstring sourcename, in wstring sourceline, in pruint32 linenumber, in pruint32 columnnumber, in pruint32 flags, in string category, in unsigned long long innerwindowid); autf8string tostring(); attributes attribute type description category string a string indicating the category of error that occurred see categories for a list. read only. columnnumber pruint32 the column number where the error occurred. this is used to draw the arrow pointing to the problem character. read only. errormessage astring the error message in a string format without any context/line number information. note: nsiconsolemessage.message will return the error fo...
...And 16 more matches

NSPR Error Handling
this chapter describes the functions for retrieving and setting errors and the error codes set by nspr. error 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. ...
...or 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 the type of file descriptor used. pr_illegal_access_error one of the arguments of the preceding function specified an invalid memory address. pr_unknown_error some unknown error has occurred. ...
...ablished. 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 the type of file descriptor used. pr_illegal_access_error one of the arguments of the preceding function specified an invalid memory address. pr_unknown_error some unknown error has occurred. pr_pending_interrupt_error the operation terminated because another thread has interrupted it with pr_interrupt. pr_not_implemented_error the preceding function has not been implemented. pr_io_error the preceding i/o function encountered some sort of an error, perhaps an invalid device. pr_io_timeout_error the i/o operation has not completed in the time specified for the preceding function. ...
...And 15 more matches

IDBTransaction.error - Web APIs
this property is null if the transaction is not finished, is finished and successfully committed, or was aborted with the idbtransaction.abort method. ...
... this property is null if the transaction is not finished, is finished and successfully committed, or was aborted with the idbtransaction.abort method. ...
... this property is null if the transaction is not finished, is finished and successfully committed, or was aborted with the idbtransaction.abort method. ...
...And 13 more matches

RTCError - Web APIs
the rtcerror interface describes an error which has occurred while handling webrtc operations. it's based upon the standard domexception interface that describes general dom errors. constructor rtcerror() creates and returns a new rtcerror object initialized with the properties of the provided rtcerrorinit dictionary and, optionally, a string to use as the value of the error's message property. properties in addition to the properties defined by the parent interface, domexception, rtcerror includes the following properties: errordetail read only a domstring specifying the webrtc-specific error code identifying the type of error that occurred. receivedalert read only an unsigned long integer value indicating the fatal dtls error which was received from the network. only valid i...
...rties in addition to the properties defined by the parent interface, domexception, rtcerror includes the following properties: errordetail read only a domstring specifying the webrtc-specific error code identifying the type of error that occurred. receivedalert read only an unsigned long integer value indicating the fatal dtls error which was received from the network. only valid if the errordetail string is dtls-failure. if null, no dtls error was received. sctpcausecode read only if errordetail is sctp-failure, this property is a long integer specifying the sctp cause code indicating the cause of the failed sctp negotiation. null if the error isn't an sctp error. ...
...cating the fatal dtls error which was received from the network. only valid if the errordetail string is dtls-failure. if null, no dtls error was received. sctpcausecode read only if errordetail is sctp-failure, this property is a long integer specifying the sctp cause code indicating the cause of the failed sctp negotiation. null if the error isn't an sctp error. sdplinenumber read only if errordetail is sdp-syntax-error, this property is a long integer identifying the line number of the sdp on which the syntax error occurred. null if the error isn't an sdp syntax error. sentalert read only if errordetail is dtls-failure, this property is an unsigned long integer indicating the fatal dtls error that was sent out by this device. ...
...And 13 more matches

SyntaxError: JSON.parse: bad parsing - JavaScript
the javascript exceptions thrown by json.parse() occur when string failed to be parsed as json. ...
... the javascript exceptions thrown by json.parse() occur when string failed to be parsed as json. ...
... the javascript exceptions thrown by json.parse() occur when string failed to be parsed as json. ...
...And 13 more matches

RangeError - JavaScript
the rangeerror object indicates an error when a value is not in the set or range of allowed values. description a rangeerror is thrown when trying to pass a value as an argument to a function that does not allow a range that includes the value. this can be encountered when: passing a value that is not one of the allowed string values to string.prototype.normalize(), or when attempting to create an array of an illegal length with the array constructor, or when passing bad values to the numeric methods number.prototype.toexponential(), number.prototype.tofixed() or number.prototype.toprecision(). constructor rangeerror() creates a new rangeerror object. instance properties rangeerror.prototype.message error message. ...
...n attempting to create an array of an illegal length with the array constructor, or when passing bad values to the numeric methods number.prototype.toexponential(), number.prototype.tofixed() or number.prototype.toprecision(). constructor rangeerror() creates a new rangeerror object. instance properties rangeerror.prototype.message error message. although ecma-262 specifies that rangeerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. rangeerror.prototype.name error name. ...
...ential(), number.prototype.tofixed() or number.prototype.toprecision(). constructor rangeerror() creates a new rangeerror object. instance properties rangeerror.prototype.message error message. although ecma-262 specifies that rangeerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. rangeerror.prototype.name error name. inherited from error. rangeerror.prototype.filename path to file that raised this error. inherited from error. rangeerror.prototype.linenumber line number in file that raised this error. inherited from error. rangeerror.prototype.columnnumber column number in line that raised this error. inherited from error. ...
...And 12 more matches

SyntaxError - JavaScript
the syntaxerror object represents an error when trying to interpret syntactically invalid code. it is thrown when the javascript engine encounters tokens or token order that does not conform to the syntax of the language when parsing code. constructor syntaxerror() creates a new syntaxerror object. instance properties syntaxerror.prototype.message error message. although ecma-262 specifies that syntaxerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. syntaxerror.prototype.name error name. inherited from error. syntaxerror.prototype.filename path to file that raised this error. inherited from error. syntaxerror.prototype.linenumber line number in file that raised this error. inherited from error. ...
...hough ecma-262 specifies that syntaxerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. syntaxerror.prototype.name error name. inherited from error. syntaxerror.prototype.filename path to file that raised this error. inherited from error. syntaxerror.prototype.linenumber line number in file that raised this error. inherited from error. syntaxerror.prototype.columnnumber column number in line that raised this error. inherited from error. syntaxerror.prototype.stack stack trace. inherited from error. ...
... error. syntaxerror.prototype.filename path to file that raised this error. inherited from error. syntaxerror.prototype.linenumber line number in file that raised this error. inherited from error. syntaxerror.prototype.columnnumber column number in line that raised this error. inherited from error. syntaxerror.prototype.stack stack trace. inherited from error. ...
...And 12 more matches

GlobalEventHandlers.onerror - Web APIs
the onerror property of the globaleventhandlers mixin is an eventhandler that processes error events. error events are fired at various targets for different kinds of errors: when a javascript runtime error (including syntax errors and exceptions thrown within handlers) occurs, an error event using interface errorevent is fired at window and window.onerror() is invoked (as well as handlers attached by window.addeventlistener (not only capturing)). when a resource (such as an <img> or <script>) fails to load, an error event using interface event is fired at the element that initiated the load, and the onerror() handler on the element is invoked. ...
... handlers) occurs, an error event using interface errorevent is fired at window and window.onerror() is invoked (as well as handlers attached by window.addeventlistener (not only capturing)). when a resource (such as an <img> or <script>) fails to load, an error event using interface event is fired at the element that initiated the load, and the onerror() handler on the element is invoked. these error events do not bubble up to window, but (at least in firefox) can be handled with a window.addeventlistener configured with usecapture set to true. installing a global error event handler is useful for automated collection of error reports. ...
...tiated the load, and the onerror() handler on the element is invoked. these error events do not bubble up to window, but (at least in firefox) can be handled with a window.addeventlistener configured with usecapture set to true. installing a global error event handler is useful for automated collection of error reports. syntax for historical reasons, different arguments are passed to window.onerror and element.onerror handlers (as well as on error-type window.addeventlistener handlers). window.onerror window.onerror = function(message, source, lineno, colno, error) { ... }; function parameters: message: error message (string). available as event (sic!) in html onerror="" handler. ...
...And 11 more matches

JS_SetErrorReporter
obsolete since jsapi 52this 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. get or specify the error reporting mechanism for an application. syntax jserrorreporter js_geterrorreporter(jsruntime *rt); jserrorreporter js_seterrorreporter(jsruntime *rt, jserrorreporter er); name type description cx jsruntime * pointer to a js runtime whose errors should be reported via your function. ...
...any time. try to avoid using it. get or specify the error reporting mechanism for an application. syntax jserrorreporter js_geterrorreporter(jsruntime *rt); jserrorreporter js_seterrorreporter(jsruntime *rt, jserrorreporter er); name type description cx jsruntime * pointer to a js runtime whose errors should be reported via your function. er jserrorreporter the user-defined error reporting function to use in your application, described below. callback syntax typedef void (* jserrorreporter)(jscontext *cx, const char *message, jserrorreport *report); name type description cx jscontext * the context in which the error happened. message const char * an error message. report j...
...eporter the user-defined error reporting function to use in your application, described below. callback syntax typedef void (* jserrorreporter)(jscontext *cx, const char *message, jserrorreport *report); name type description cx jscontext * the context in which the error happened. message const char * an error message. report jserrorreport * an error report record containing additional details about the error. description js_seterrorreporter enables you to define and use your own error reporting mechanism in your applications. the reporter you define is automatically passed a jserrorreport structure when an error occurs and has been parsed by js_reporterror. ...
...And 10 more matches

nsIErrorService
xpcom/base/nsierrorservice.idlscriptable this is a service that allows nsresult codes to be mapped to string bundles that can be used to look up error messages. string bundle keys can also be mapped. ...
... xpcom/base/nsierrorservice.idlscriptable this is a service that allows nsresult codes to be mapped to string bundles that can be used to look up error messages. string bundle keys can also be mapped. ...
... xpcom/base/nsierrorservice.idlscriptable this is a service that allows nsresult codes to be mapped to string bundles that can be used to look up error messages. string bundle keys can also be mapped. ...
...And 10 more matches

MediaError.message - Web APIs
the read-only property mediaerror.message returns a domstring which contains a human-readable string offering specific diagnostic details related to the error described by the mediaerror object, or an empty string ("") if no diagnostic information can be determined or provided. syntax var errormessage = mediaerror.message; value a domstring providing a detailed, specific explanation of what went wrong and possibly how it might be fixed. this is not simply a generic description of the mediaerror.code property's value, but instead goes deeper into the specifics of this particular error and its circumstances. if no specific details are available, this string is empty. ...
...ing providing a detailed, specific explanation of what went wrong and possibly how it might be fixed. this is not simply a generic description of the mediaerror.code property's value, but instead goes deeper into the specifics of this particular error and its circumstances. if no specific details are available, this string is empty. example this example creates a <audio> element, establishes an error handler for it, then lets the user click buttons to choose whether to assign a valid audio file or a missing file to the element's src attribute. the error handler simply outputs a message to a box onscreen describing the error, including both the code and the message. only the relevant parts of the code are displayed; you can see the complete source code here. the example creates an <audio> el...
...ute. the error handler simply outputs a message to a box onscreen describing the error, including both the code and the message. only the relevant parts of the code are displayed; you can see the complete source code here. the example creates an <audio> element and lets the user assign either a valid music file to it, or a link to a file which doesn't exist. this lets us see the behavior of the error event handler, which is received by an event handler we add to the <audio> element itself. ...
...And 10 more matches

AggregateError - JavaScript
the aggregateerror object represents an error when several errors need to be wrapped in a single error. it is thrown when multiple errors need to be reported by an operation, for example by promise.any(), when all promises passed to it reject. constructor aggregateerror() creates a new aggregateerror object. instance properties aggregateerror.prototype.message error message, defaults to "". aggregateerror.prototype.name error name, defaults to aggregateerror. ...
...thrown when multiple errors need to be reported by an operation, for example by promise.any(), when all promises passed to it reject. constructor aggregateerror() creates a new aggregateerror object. instance properties aggregateerror.prototype.message error message, defaults to "". aggregateerror.prototype.name error name, defaults to aggregateerror. ...
...orted by an operation, for example by promise.any(), when all promises passed to it reject. constructor aggregateerror() creates a new aggregateerror object. instance properties aggregateerror.prototype.message error message, defaults to "". aggregateerror.prototype.name error name, defaults to aggregateerror. ...
...And 8 more matches

WebAssembly.RuntimeError - JavaScript
the webassembly.runtimeerror object is the error type that is thrown whenever webassembly specifies a trap. constructor webassembly.runtimeerror() creates a new webassembly.runtimeerror object. instance properties webassembly.runtimeerror.prototype.message error message. although ecma-262 specifies that urierror should provide its own message property, in spidermonkey, it inherits error.prototype.message. webassembly.runtimeerror.prototype.name error name. inherited from error. webassembly.runtimeerror.prototype.filename path to file that raised this error. inherited from error. webassembly.runtimeerror.prototype.linenumber line number in file that raised this error. inherited from error. ...
...vide its own message property, in spidermonkey, it inherits error.prototype.message. webassembly.runtimeerror.prototype.name error name. inherited from error. webassembly.runtimeerror.prototype.filename path to file that raised this error. inherited from error. webassembly.runtimeerror.prototype.linenumber line number in file that raised this error. inherited from error. webassembly.runtimeerror.prototype.columnnumber column number in line that raised this error. inherited from error. webassembly.runtimeerror.prototype.stack stack trace. inherited from error. instance methods webassembly.runtimeerror.prototype.tosource() returns code that could eval to the same error. inherited from error. ...
...hat raised this error. inherited from error. webassembly.runtimeerror.prototype.columnnumber column number in line that raised this error. inherited from error. webassembly.runtimeerror.prototype.stack stack trace. inherited from error. instance methods webassembly.runtimeerror.prototype.tosource() returns code that could eval to the same error. inherited from error. webassembly.runtimeerror.prototype.tostring() returns a string representing the specified error object.. inherited from error. ...
...And 8 more matches

PR_SetError
the runtime merely stores the value and returns it when requested. ...
...the runtime merely stores the value and returns it when requested. ...
...the runtime merely stores the value and returns it when requested. ...
...And 7 more matches

IDBRequest.error - Web APIs
the error read-only property of the idbrequest interface returns the error in the event of an unsuccessful request. note: this feature is available in web workers. syntax var myerror = request.error; value a domerror containing the relevant error. in chrome 48+/firefox 58+ this property returns a domexception because domerror has been removed from the dom standard. the following error codes are returned under certain conditions: error explanation aborterror if you abort the transaction, then all requests still in progress receive this error. constrainterror if you insert data that doesn't conform to a constraint. it's an exception type for creating stores and indexes. ...
... been removed from the dom standard. the following error codes are returned under certain conditions: error explanation aborterror if you abort the transaction, then all requests still in progress receive this error. 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. quotaexceedederror if you run out of disk quota and the user declined to grant you more space. unknownerror if the operation failed for reasons unrelated to the database itself. a failure due to disk io errors is such an example. ...
... 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. quotaexceedederror if you run out of disk quota and the user declined to grant you more space. unknownerror if the operation failed for reasons unrelated to the database itself. a failure due to disk io errors is such an example. noerror if the request succeeds. versionerror if you try to open a database with a version lower than the one it already has. in addition to the error codes sent to the idbrequest object, asynchronous operations can also raise exceptions. the list describes problems that could occur when the request is being executed, but you might also encounter other problems when the request is b...
...And 7 more matches

RTCDataChannel: error event - Web APIs
a webrtc error event is sent to an rtcdatachannel object's onerror error handler when an error occurs on the data channel. bubbles yes cancelable no interface rtcerrorevent event handler property onerror the rtcerrorevent object provides details about the error that occurred; see that article for details. ...
... cancelable no interface rtcerrorevent event handler property onerror the rtcerrorevent object provides details about the error that occurred; see that article for details. ...
...operty onerror the rtcerrorevent object provides details about the error that occurred; see that article for details. ...
...And 7 more matches

Network Error Logging - HTTP
network error logging is a mechanism that can be configured via the nel http response header. this experimental header allows web sites and applications to opt-in to receive reports about failed (and, if desired, successful) network fetches from supporting browsers. reports are sent to a reporting group defined within a report-to header. usage web applications opt in to this behaviour with the nel header, which is a json-encoded object: nel: { "report_to": "nel", "max_age": 31556952 } an origin considered secure by the browser is required. the following object keys can be specified in the nel header: report_to the reporting api group to send network error reports to (see below). max_age specifies the lifetime of the policy, in seconds (in a similar way to e.g. hsts po...
.... defaults to 1, so that all failed network requests will be reported if the key is not present in the json payload. ...
...reporting group referenced above is defined in the usual manner within the report-to header, for example: report-to: { "group": "nel", "max_age": 31556952, "endpoints": [ { "url": "https://example.com/csp-reports" } ] } error reports in these examples, the entire reporting api payload is shown. the top-level "body" key contains the network error report. ...
...And 7 more matches

SyntaxError() constructor - JavaScript
the syntaxerror constructor creates a new error object that represents an error when trying to interpret syntactically invalid code. ...
... the syntaxerror constructor creates a new error object that represents an error when trying to interpret syntactically invalid code. ...
... the syntaxerror constructor creates a new error object that represents an error when trying to interpret syntactically invalid code. ...
...And 7 more matches

WebAssembly.CompileError - JavaScript
the webassembly.compileerror object indicates an error during webassembly decoding or validation. constructor webassembly.compileerror() creates a new webassembly.compileerror object. instance properties webassembly.compileerror.prototype.message error message. although ecma-262 specifies that urierror should provide its own message property, in spidermonkey, it inherits error.prototype.message. webassembly.compileerror.prototype.name error name. inherited from error. webassembly.compileerror.prototype.filename path to file that raised this error. inherited from error. webassembly.compileerror.prototype.linenumber line number in file that raised this error. inherited from error. webassembly.compileerror.prototype.columnnumber column number in line that raised this error. inh...
...sembly.compileerror.prototype.name error name. inherited from error. webassembly.compileerror.prototype.filename path to file that raised this error. inherited from error. webassembly.compileerror.prototype.linenumber line number in file that raised this error. inherited from error. webassembly.compileerror.prototype.columnnumber column number in line that raised this error. inherited from error. webassembly.compileerror.prototype.stack stack trace. inherited from error. instance methods webassembly.compileerror.prototype.tosource() returns code that could eval to the same error. inherited from error. webassembly.compileerror.prototype.tostring() returns a string representing the specified error object.. inherited from error. ...
...herited from error. webassembly.compileerror.prototype.stack stack trace. inherited from error. instance methods webassembly.compileerror.prototype.tosource() returns code that could eval to the same error. inherited from error. webassembly.compileerror.prototype.tostring() returns a string representing the specified error object.. inherited from error. ...
...And 7 more matches

WebAssembly.LinkError - JavaScript
the webassembly.linkerror object indicates an error during module instantiation (besides traps from the start function). constructor webassembly.linkerror() creates a new webassembly.linkerror object. instance properties webassembly.linkerror.prototype.message error message. although ecma-262 specifies that urierror should provide its own message property, in spidermonkey, it inherits error.prototype.message. webassembly.linkerror.prototype.name error name. inherited from error. webassembly.linkerror.prototype.filename path to file that raised this error. inherited from error. webassembly.linkerror.prototype.linenumber line number in file that raised this error. inherited from error. webassembly.linkerror.prototype.columnnumber column number in line that raised this error. i...
...sage. webassembly.linkerror.prototype.name error name. inherited from error. webassembly.linkerror.prototype.filename path to file that raised this error. inherited from error. webassembly.linkerror.prototype.linenumber line number in file that raised this error. inherited from error. webassembly.linkerror.prototype.columnnumber column number in line that raised this error. inherited from error. webassembly.linkerror.prototype.stack stack trace. inherited from error. instance methods webassembly.linkerror.prototype.tosource() returns code that could eval to the same error. inherited from error. webassembly.linkerror.prototype.tostring() returns a string representing the specified error object.. inherited from error. ...
...is error. inherited from error. webassembly.linkerror.prototype.stack stack trace. inherited from error. instance methods webassembly.linkerror.prototype.tosource() returns code that could eval to the same error. inherited from error. webassembly.linkerror.prototype.tostring() returns a string representing the specified error object.. inherited from error. ...
...And 7 more matches

TypeError: setting getter-only property "x" - JavaScript
there is an attempt to set a new value to a property for which only a getter is specified. ...
... there is an attempt to set a new value to a property for which only a getter is specified. ...
... there is an attempt to set a new value to a property for which only a getter is specified. ...
...And 6 more matches

TypeError: More arguments needed - JavaScript
more arguments need to be provided. ...
...more arguments need to be provided. ...
...more arguments need to be provided. ...
...And 6 more matches

RangeError: precision is out of range - JavaScript
the javascript exception "precision is out of range" occurs when a number that's outside of the range of 0 and 20 (or 21) was passed into tofixed or toprecision. ...
... the javascript exception "precision is out of range" occurs when a number that's outside of the range of 0 and 20 (or 21) was passed into tofixed or toprecision. ...
... the javascript exception "precision is out of range" occurs when a number that's outside of the range of 0 and 20 (or 21) was passed into tofixed or toprecision. ...
...And 6 more matches

TypeError: "x" is (not) "y" - JavaScript
what went wrong? there was an unexpected type. this occurs oftentimes with undefined or null values. ...
... what went wrong? there was an unexpected type. this occurs oftentimes with undefined or null values. ...
... what went wrong? there was an unexpected type. this occurs oftentimes with undefined or null values. ...
...And 6 more matches

Error.prototype.stack - JavaScript
the non-standard stack property of error objects offer a trace of which functions were called, in what order, from which line and file, and with what arguments. the stack string proceeds from the most recent calls to earlier ones, leading back to the original global scope call. description each step will be separated by a newline, with the first part of the line being the function name (if not a call from the global scope), then by an at (@) sign, the file location (except when the function is the error constructor as the error is being thrown), a colon, and, if there is a file location, the line number. ...
..., leading back to the original global scope call. description each step will be separated by a newline, with the first part of the line being the function name (if not a call from the global scope), then by an at (@) sign, the file location (except when the function is the error constructor as the error is being thrown), a colon, and, if there is a file location, the line number. (note that the error object also possesses the filename, linenumber and columnnumber properties for retrieving these from the error thrown (but only the error, and not its trace).) note that this is the format used by firefox. there is no standard formatting. however, safari 6+ and opera 12- use a very similar format. browsers using the v8 javascript engine (such as chrome, opera 15+, android browser) and ie10+, on ...
... argument values in the stack: prior to firefox 14, the function name would be followed by the argument values converted to string in parentheses immediately before the at (@) sign. ...
...And 6 more matches

WebAssembly.RuntimeError() constructor - JavaScript
the webassembly.runtimeerror() constructor creates a new webassembly runtimeerror object — the type that is thrown whenever webassembly specifies a trap. syntax new webassembly.runtimeerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
...ype that is thrown whenever webassembly specifies a trap. syntax new webassembly.runtimeerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
...syntax new webassembly.runtimeerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
...And 6 more matches

DedicatedWorkerGlobalScope: messageerror event - Web APIs
the messageerror event is fired on a dedicatedworkerglobalscope object when it receives a message that can't be deserialized. ...
... the messageerror event is fired on a dedicatedworkerglobalscope object when it receives a message that can't be deserialized. ...
... the messageerror event is fired on a dedicatedworkerglobalscope object when it receives a message that can't be deserialized. ...
...And 5 more matches

ErrorEvent - Web APIs
the errorevent interface represents events providing information related to errors in scripts or in files. <div id="interfacediagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 20%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 120" preserveaspectratio="xminymin meet"><a xlink:href="/docs/web/api/event" target="_top"><rect x="1" y="1" width="75" height="50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="38.5" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">event</text></a><polyline points="76,25 86,20 86,30 76,25" stroke="#d4dde4" fill="none"/><line x1="86" y1...
...75" height="50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="38.5" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">event</text></a><polyline points="76,25 86,20 86,30 76,25" stroke="#d4dde4" fill="none"/><line x1="86" y1="25" x2="116" y2="25" stroke="#d4dde4"/><a xlink:href="/docs/web/api/errorevent" target="_top"><rect x="116" y="1" width="100" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="166" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">errorevent</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties also inherits prope...
...6" y="1" width="100" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="166" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">errorevent</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties also inherits properties from its parent event. errorevent.message read only is a domstring containing a human-readable error message describing the problem. ...
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MediaRecorder.onerror - Web APIs
the mediarecorder interface's onerror event handler is called by the mediastream recording api when an error occurs. you can provide an event handler to deal with errors that occur while creating or using a media recorder. the error object is of type mediarecordererrorevent, and its error property contains a domexception object that describes the error that occurred. syntax mediarecorder.onerror = errorhandlerfunction; value a function to be called whenever an error occurs during the recorder's lifetime. in addition to other general errors that might occur, the following errors are specifically possible when using the mediastream recording api; to determine which occurred, check the value of mediarecordererrorevent.error.name. ...
...at occurred. syntax mediarecorder.onerror = errorhandlerfunction; value a function to be called whenever an error occurs during the recorder's lifetime. in addition to other general errors that might occur, the following errors are specifically possible when using the mediastream recording api; to determine which occurred, check the value of mediarecordererrorevent.error.name. invalidstateerror an attempt was made to stop or pause or an inactive recorder, start or resume an active recorder, or otherwise manipulate the mediarecorder while in the wrong state. this exception can also occur when a request is made on a source that has been deleted or removed. securityerror the mediastream is configured to disallow recording. this may be the case, for example, with sources obtained using g...
... a source that has been deleted or removed. securityerror the mediastream is configured to disallow recording. this may be the case, for example, with sources obtained using getusermedia() when the user denies permission to use an input device. this also happens when a mediastreamtrack within the stream is marked as isolated due to the peeridentity constraint on the source stream. notsupportederror an attempt was made to instantiate a mediarecorder using a mime type that isn't supported on the user's device; one or more of the requested container, codecs, or profiles as well as other information may be invalid. unknownerror an non-security related error occurred that cannot otherwise be categorized. recording stops, the mediarecorder's state becomes inactive, one last dataavailable event...
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RTCErrorEvent - Web APIs
methods no additional methods are provided beyond any found on the parent interface, event. ...
... methods no additional methods are provided beyond any found on the parent interface, event. ...
... methods no additional methods are provided beyond any found on the parent interface, event. ...
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RTCPeerConnection: icecandidateerror event - Web APIs
the webrtc api event icecandidateerror is sent to an rtcpeerconnection if an error occurs while performing ice negotiations through a stun or turn server. the event object is of type rtcpeerconnectioniceerrorevent, and contains information describing the error in some amount of detail. bubbles no cancelable no interface rtcpeerconnectioniceerrorevent event handler property rtcpeerconnection.onicecandidateerror description the error object's errorcode property is one of the numeric stun error codes. there is one additional, webrtc-specific, error which lies outside the valid stun error code range: 701. ...
...me amount of detail. bubbles no cancelable no interface rtcpeerconnectioniceerrorevent event handler property rtcpeerconnection.onicecandidateerror description the error object's errorcode property is one of the numeric stun error codes. there is one additional, webrtc-specific, error which lies outside the valid stun error code range: 701. error 701 indicates that none of the ice candidates were able to successfully make contact with the stun or turn server. the 701 error is fired only once per server url from the list of available stun or turn servers provided when creating the rtcpeerconnection. these errors occur only when the connection's ice gathering state is gathering. example the following example establishes a handler for ice...
...cates that none of the ice candidates were able to successfully make contact with the stun or turn server. the 701 error is fired only once per server url from the list of available stun or turn servers provided when creating the rtcpeerconnection. these errors occur only when the connection's ice gathering state is gathering. example the following example establishes a handler for icecandidateerrors that occur on the rtcpeerconnection pc. this handler looks specifically for 701 errors that indicate that candidates couldn't reach the stun or turn server. ...
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Window: messageerror event - Web APIs
the messageerror event is fired on a window object when it receives a message that can't be deserialized. ...
... the messageerror event is fired on a window object when it receives a message that can't be deserialized. ...
... the messageerror event is fired on a window object when it receives a message that can't be deserialized. ...
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ReferenceError: deprecated caller or arguments usage - JavaScript
javascript execution won't be halted. ...
...javascript execution won't be halted. ...
...javascript execution won't be halted. ...
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SyntaxError: illegal character - JavaScript
use an editor that supports syntax highlighting and carefully check your code against mismatches like a minus sign ( - ) versus a dash ( – ) or simple quotes ( " ) vs non-standard quotation marks ( “ ). ...
...use an editor that supports syntax highlighting and carefully check your code against mismatches like a minus sign ( - ) versus a dash ( – ) or simple quotes ( " ) vs non-standard quotation marks ( “ ). ...
...use an editor that supports syntax highlighting and carefully check your code against mismatches like a minus sign ( - ) versus a dash ( – ) or simple quotes ( " ) vs non-standard quotation marks ( “ ). ...
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TypeError: invalid assignment to const "x" - JavaScript
a constant is a value that cannot be altered by the program during normal execution. it cannot change through re-assignment, and it can't be redeclared. ...
... a constant is a value that cannot be altered by the program during normal execution. it cannot change through re-assignment, and it can't be redeclared. ...
... a constant is a value that cannot be altered by the program during normal execution. it cannot change through re-assignment, and it can't be redeclared. ...
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SyntaxError: Malformed formal parameter - JavaScript
the last argument is the source code for the new function you're creating. all the rest make up your new function's argument list. the argument list is invalid somehow. ...
...the last argument is the source code for the new function you're creating. all the rest make up your new function's argument list. the argument list is invalid somehow. ...
...the last argument is the source code for the new function you're creating. all the rest make up your new function's argument list. the argument list is invalid somehow. ...
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TypeError: "x" is not a non-null object - JavaScript
null is not an object and won't work. you must provide a proper object in the given situation. ...
...null is not an object and won't work. you must provide a proper object in the given situation. ...
...null is not an object and won't work. you must provide a proper object in the given situation. ...
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TypeError: "x" is not a function - JavaScript
some code expects you to provide a function, but that didn't happen. ...
...some code expects you to provide a function, but that didn't happen. ...
...some code expects you to provide a function, but that didn't happen. ...
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SyntaxError: Unexpected token - JavaScript
a specific language construct was expected, but something else was provided. this might be a simple typo. ...
... a specific language construct was expected, but something else was provided. this might be a simple typo. ...
... a specific language construct was expected, but something else was provided. this might be a simple typo. ...
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Error.prototype.toString() - JavaScript
the tostring() method returns a string representing the specified error object. syntax e.tostring() return value a string representing the specified error object. description the error object overrides the object.prototype.tostring() method inherited by all objects. ...
... the tostring() method returns a string representing the specified error object. syntax e.tostring() return value a string representing the specified error object. description the error object overrides the object.prototype.tostring() method inherited by all objects. ...
...ntax e.tostring() return value a string representing the specified error object. description the error object overrides the object.prototype.tostring() method inherited by all objects. ...
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TypeError - JavaScript
the typeerror object represents an error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type. a typeerror may be thrown when: an operand or argument passed to a function is incompatible with the type expected by that operator or function; or when attempting to modify a value that cannot be changed; or when attempting to use a value in an inappropriate way. constructor typeerror() creates a new typeerror object. instance properties typeerror.prototype.message error message. although ecma-262 specifies that typeerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. typeerror.prototype.name error name. inherited from error. ...
...ged; or when attempting to use a value in an inappropriate way. constructor typeerror() creates a new typeerror object. instance properties typeerror.prototype.message error message. although ecma-262 specifies that typeerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. typeerror.prototype.name error name. inherited from error. typeerror.prototype.filename path to file that raised this error. inherited from error. typeerror.prototype.linenumber line number in file that raised this error. inherited from error. typeerror.prototype.columnnumber column number in line that raised this error. inherited from error. ...
...key, it inherits error.prototype.message. typeerror.prototype.name error name. inherited from error. typeerror.prototype.filename path to file that raised this error. inherited from error. typeerror.prototype.linenumber line number in file that raised this error. inherited from error. typeerror.prototype.columnnumber column number in line that raised this error. inherited from error. typeerror.prototype.stack stack trace. inherited from error. ...
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WebAssembly.CompileError() constructor - JavaScript
the webassembly.compileerror() constructor creates a new webassembly compileerror object, which indicates an error during webassembly decoding or validation. syntax new webassembly.compileerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
...cates an error during webassembly decoding or validation. syntax new webassembly.compileerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
...syntax new webassembly.compileerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
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WebAssembly.LinkError() constructor - JavaScript
the webassembly.linkerror() constructor creates a new webassembly linkerror object, which indicates an error during module instantiation (besides traps from the start function). syntax new webassembly.linkerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
...g module instantiation (besides traps from the start function). syntax new webassembly.linkerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
...ction). syntax new webassembly.linkerror(message, filename, linenumber) parameters message optional human-readable description of the error. filename optional the name of the file containing the code that caused the exception. linenumber optional the line number of the code that caused the exception. ...
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OS.File.Error
instances of os.file.error are used by os.file to notify of file-related errors. using os.file.error example: finding out whether the problem is due to a file that does not exist try { let file = os.file.open("myfile.txt"); // ... } catch (ex) { if (ex instanceof os.file.error && ex.becausenosuchfile) { // the file does not exist } } global object os.file.error methods overview the following functions are utility functions that may be used to construct instances of os.file.error, setting the platform-specific error number. error closed() error exists() methods os.file.error.closed() return an error representing the fact that a file is closed. os.file.error.exists() return an error representing the fact that a file exists. instances of os.file.er...
...cross-platform attributes operation the human-readable name of the failed operation. ...
...cross-platform attributes operation the human-readable name of the failed operation. becauseexists true if the operation failed because a file or directory exists, false otherwise. ...
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Components.utils.reportError
components.utils.reporterror reports a javascript error object to the error console, and returns. it is meant for use by extension developers who have exception handler blocks which want to "eat" an exception, but still want to report it to the console. it must be called with one parameter, usually an object which was caught by an exception handler. if it is not a javascript error object, the parameter is converted to a string and reported as a new error. this means you can use components.utils.reporterror to report debugging messages to the error console, just like dump() can be used to print messages to the native console. however you should use nsiconsoleservice for logging, as it logs the messages with normal severity, unlike reporterror. function mydump(amessage) { var console...
...to show them, set the preference 'javascript.options.showinconsole' to true, or use nsconsoleservice instead to show a message. ...
...eservice for logging, as it logs the messages with normal severity, unlike reporterror. function mydump(amessage) { var consoleservice = components.classes["@mozilla.org/consoleservice;1"] .getservice(components.interfaces.nsiconsoleservice); consoleservice.logstringmessage("my component: " + amessage); } firefox 3: the error console will not display chrome errors by default. to show them, set the preference 'javascript.options.showinconsole' to true, or use nsconsoleservice instead to show a message. firefox 4: the preference 'javascript.options.showinconsole' is set to true by default in this version. ...
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AddressErrors.country - Web APIs
if the paymentaddress object's country property was determined to be valid, this property is not included in the dictionary. ...
... if the paymentaddress object's country property was determined to be valid, this property is not included in the dictionary. ...
... if the paymentaddress object's country property was determined to be valid, this property is not included in the dictionary. ...
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FileError - Web APIs
represents an error that occurs while using the filereader interface. note: this interface is obsolete per the latest specification. use the new dom4 domerror interface instead. in the file system api, a fileerror represents error conditions that you might encounter while accessing the file system using the asynchronous api. it extends the fileerror interface described in file writer and adds several new error codes. fileerror objects are passed to error callbacks. the objects have a code that shows the type of error that occurred. best practices most people don't read the page on errors and exceptions unless they're stumped. so the following are a few tips that could help you avoid some pitfalls. ...
...a web app could fail for various reasons, so you don't want to spend the rest of your day guessing what's going on and going through maddening troubleshooting. ...
...a web app could fail for various reasons, so you don't want to spend the rest of your day guessing what's going on and going through maddening troubleshooting. ...
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MediaRecorder: error event - Web APIs
the mediarecorder interface's error event is fired when an error occurs: for example because recording wasn't allowed or was attempted using an unsupported codec. bubbles no cancelable no interface mediarecordererrorevent event handler property onerror for details of the all the possible errors see the documentation for the event handler property: onerror. ...
...r occurs: for example because recording wasn't allowed or was attempted using an unsupported codec. bubbles no cancelable no interface mediarecordererrorevent event handler property onerror for details of the all the possible errors see the documentation for the event handler property: onerror. ...
... event handler property onerror for details of the all the possible errors see the documentation for the event handler property: onerror. ...
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SyntaxError: invalid regular expression flag "x" - JavaScript
in a regular expression literal, which consists of a pattern enclosed between slashes, the flags are defined after the second slash. ...
...in a regular expression literal, which consists of a pattern enclosed between slashes, the flags are defined after the second slash. ...
...in a regular expression literal, which consists of a pattern enclosed between slashes, the flags are defined after the second slash. ...
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SyntaxError: missing : after property id - JavaScript
when creating objects with the object initializer syntax, a colon (:) separates keys and values for the object's properties. ...
... when creating objects with the object initializer syntax, a colon (:) separates keys and values for the object's properties. ...
... when creating objects with the object initializer syntax, a colon (:) separates keys and values for the object's properties. ...
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SyntaxError: missing variable name - JavaScript
probably a comma is wrong somewhere or you struggled with coming up with a name. totally understandable! naming things is so hard. check to ensure the previous lines / declaration does not end with a comma instead of a semi-colon. ...
...probably a comma is wrong somewhere or you struggled with coming up with a name. totally understandable! naming things is so hard. check to ensure the previous lines / declaration does not end with a comma instead of a semi-colon. ...
...probably a comma is wrong somewhere or you struggled with coming up with a name. totally understandable! naming things is so hard. check to ensure the previous lines / declaration does not end with a comma instead of a semi-colon. ...
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RangeError: argument is not a valid code point - JavaScript
the javascript exception "invalid code point" occurs when nan values, negative integers (-1), non-integers (5.4), or values larger than 0x10ffff (1114111) are used with string.fromcodepoint(). message rangeerror: {0} is not a valid code point (firefox) rangeerror: invalid code point {0} (chromium) error type rangeerror what went wrong? string.fromcodepoint() throws this error when passed nan values, negative integers (-1), non-integers (5.4), or values larger than 0x10ffff (1114111). ...
...r: invalid code point {0} (chromium) error type rangeerror what went wrong? ...
...ype rangeerror what went wrong? ...
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SyntaxError: "x" is a reserved identifier - JavaScript
reserved keywords will throw in if they are used as identifiers. ...
... reserved keywords will throw in if they are used as identifiers. ...
... reserved keywords will throw in if they are used as identifiers. ...
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RangeError: repeat count must be less than infinity - JavaScript
it has a count parameter indicating the number of times to repeat the string. it must be between 0 and less than positive infinity and cannot be a negative number. ...
...it has a count parameter indicating the number of times to repeat the string. it must be between 0 and less than positive infinity and cannot be a negative number. ...
...it has a count parameter indicating the number of times to repeat the string. it must be between 0 and less than positive infinity and cannot be a negative number. ...
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InternalError: too much recursion - JavaScript
what went wrong? a function that calls itself is called a recursive function. once a condition is met, the function stops calling itself. this is called a base case. in some ways, recursion is analogous to a loop. ...
... what went wrong? a function that calls itself is called a recursive function. once a condition is met, the function stops calling itself. this is called a base case. in some ways, recursion is analogous to a loop. ...
... what went wrong? a function that calls itself is called a recursive function. once a condition is met, the function stops calling itself. this is called a base case. in some ways, recursion is analogous to a loop. ...
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TypeError: cannot use 'in' operator to search for 'x' in 'y' - JavaScript
the in operator can only be used to check if a property is in an object. ...
... the in operator can only be used to check if a property is in an object. ...
... the in operator can only be used to check if a property is in an object. ...
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TypeError: invalid 'instanceof' operand 'x' - JavaScript
the javascript exception "invalid 'instanceof' operand" occurs when the right hand side operands of the instanceof operator isn't used with a constructor object, i.e. an object which has a prototype property and is callable. ...
... the javascript exception "invalid 'instanceof' operand" occurs when the right hand side operands of the instanceof operator isn't used with a constructor object, i.e. an object which has a prototype property and is callable. ...
... the javascript exception "invalid 'instanceof' operand" occurs when the right hand side operands of the instanceof operator isn't used with a constructor object, i.e. an object which has a prototype property and is callable. ...
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InternalError - JavaScript
the internalerror object indicates an error that occurred internally in the javascript engine. example cases are mostly when something is too large, e.g.: "too many switch cases", "too many parentheses in regular expression", "array initializer too large", "too much recursion". constructor internalerror() creates a new internalerror object. instance properties internalerror.prototype.message error message. inherited from error. internalerror.prototype.name error name. inherited from error. internalerror.prototype.filename path to file that raised this error. inherited from error. internalerror.prototype.linenumber line number in file that raised this error. inherited from error. ...
... examples too much recursion this recursive function runs 10 times, as per the exit condition. ...
... examples too much recursion this recursive function runs 10 times, as per the exit condition. ...
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ReferenceError - JavaScript
the referenceerror object represents an error when a non-existent variable is referenced. constructor referenceerror() creates a new referenceerror object. instance properties referenceerror.prototype.message error message. although ecma-262 specifies that referenceerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. referenceerror.prototype.name error name. inherited from error. referenceerror.prototype.filename path to file that raised this error. inherited from error. referenceerror.prototype.linenumber line number in file that raised this error. inherited from error. referenceerror.prototype.columnnumber column number in line that raised this error. inherited from error. referenceerror.prototype.stack stack trace. inherit...
...ror name. inherited from error. referenceerror.prototype.filename path to file that raised this error. inherited from error. referenceerror.prototype.linenumber line number in file that raised this error. inherited from error. referenceerror.prototype.columnnumber column number in line that raised this error. inherited from error. referenceerror.prototype.stack stack trace. inherited from error. ...
...nceerror.prototype.filename path to file that raised this error. inherited from error. referenceerror.prototype.linenumber line number in file that raised this error. inherited from error. referenceerror.prototype.columnnumber column number in line that raised this error. inherited from error. referenceerror.prototype.stack stack trace. inherited from error. ...
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Error.number - Archive of obsolete content
non-standard. do not use! this object is a microsoft extension and is only supported in internet explorer. the error.number property returns or sets the numeric value associated with a specific error. the error object's default property is number. syntax object .number [= errornumber] parameters object any instance of the error object. errornumber an integer representing an error. remarks an error number is a 32-bit value. the upper 16-bit word is the facility code, and the lower word is the error code. to determine the error code, use the & (bitwise and) operator to combine the number property with the hexadecimal number 0xffff. example the following example causes an exception to be thrown and displays the error code that is derived from the error number. try { // ca...
...ror number is a 32-bit value. the upper 16-bit word is the facility code, and the lower word is the error code. to determine the error code, use the & (bitwise and) operator to combine the number property with the hexadecimal number 0xffff. example the following example causes an exception to be thrown and displays the error code that is derived from the error number. try { // cause an error. ...
...ity code, and the lower word is the error code. to determine the error code, use the & (bitwise and) operator to combine the number property with the hexadecimal number 0xffff. example the following example causes an exception to be thrown and displays the error code that is derived from the error number. try { // cause an error. var x = y; } catch(e) { document.write ("error code: "); document.write (e.number & 0xffff) document.write ("<br />"); document.write ("facility code: ") document.write(e.number>>16 & 0x1fff) document.write ("<br />"); document.write ("error message: ") document.write (e.message) } example the output of this code is as follows. ...
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JS::CreateError
this article covers features introduced in spidermonkey 38 create an error object. syntax // added in spidermonkey 45 bool js::createerror(jscontext *cx, jsexntype type, handleobject stack, handlestring filename, uint32_t linenumber, uint32_t columnnumber, jserrorreport *report, handlestring message, mutablehandlevalue rval); // obsolete since jsapi 39 bool js::createerror(jscontext *cx, jsexntype type, handlestring stack, handlestring filename, uint32_t linenumber, uint32_t columnnumber, jserrorreport *report, handlestring message, mutablehandlevalue rval); name type description cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_...
...andlestring message, mutablehandlevalue rval); name type description cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. type jsexntype the exception's type. ...
...cription cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. type jsexntype the exception's type. stack js::handlestring or js::handleobject the value of error.prototype.stack. filename js::handlestring the value of error.prototype.filename. linenumber uint32_t the value of error.prototype.linenumber. columnnumber uint32_t the value of error.prototype.columnnumber. report jserrorreport * a pointer to jserrorreport instance. message js::handlestring the value of error.prototype.message. rval js::mutablehandlevalue out parameter. receives the...
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Source map errors - Firefox Developer Tools
e maps are json files providing a way to associate transformed sources, as seen by the browser, with their original sources, as written by the developer. you can sometimes encounter problems working with source maps. this page explains the most common problems and how to fix them. note: if you're new to source maps, you can learn more about them in how to use a source map. ...
...iginal sources, as written by the developer. you can sometimes encounter problems working with source maps. this page explains the most common problems and how to fix them. note: if you're new to source maps, you can learn more about them in how to use a source map. general source map error reporting if you do see a problem, a message will appear in the webconsole. this message will show an error message, the resource url, and the source map url: here, the resource url tells us that bundle.js mentions a source map, and the source map url tells us where to find the source map data (in this case, relative to the resource). the error tells us that the source map is not json data — so we're serving the wrong file. there are a few common ways that source maps can go wrong; they are deta...
...ys that source maps can go wrong; they are detailed in the following sections. source map missing or inaccessible the source map resource can be missing or inaccessible. the fix here is to make sure the file is being served and is accessible to the browser invalid source map the source map data can be invalid — either simply not a json file at all, or with an incorrect structure. ...
...And 3 more matches

AddressErrors.regionCode - Web APIs
usage notes the region code is derived from the iso 3166-2 country subdivision name standard. ...
... usage notes the region code is derived from the iso 3166-2 country subdivision name standard. ...
... usage notes the region code is derived from the iso 3166-2 country subdivision name standard. ...
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Document: pointerlockerror event - Web APIs
the pointerlockerror event is fired when locking the pointer failed (for technical reasons or because the permission was denied). ...
... the pointerlockerror event is fired when locking the pointer failed (for technical reasons or because the permission was denied). ...
... the pointerlockerror event is fired when locking the pointer failed (for technical reasons or because the permission was denied). ...
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IDBDatabase.onerror - Web APIs
the onerror event handler of the idbdatabase interface handles the error event, fired when a request returns an error and bubbles up to the connection object. note: consider using idbopendbrequest.onsuccess instead (see idbrequest.onsuccess, where it is inherited from). note: this feature is available in web workers. syntax idbdatabase.onerror = function(event) { ... } example this example shows an idbopendbrequest.onupgradeneeded block that creates a new object store; it also includes onerror and onabort functions to handle non-success cases. ...
...s, where it is inherited from). note: this feature is available in web workers. syntax idbdatabase.onerror = function(event) { ... } example this example shows an idbopendbrequest.onupgradeneeded block that creates a new object store; it also includes onerror and onabort functions to handle non-success cases. ...
...is available in web workers. syntax idbdatabase.onerror = function(event) { ... } example this example shows an idbopendbrequest.onupgradeneeded block that creates a new object store; it also includes onerror and onabort functions to handle non-success cases. ...
...And 3 more matches

IDBRequest: error event - Web APIs
the error handler is executed when an error caused a request to fail. ...
... the error handler is executed when an error caused a request to fail. ...
... the error handler is executed when an error caused a request to fail. ...
...And 3 more matches

IDBTransaction.onerror - Web APIs
the onerror event handler of the idbtransaction interface handles the error event, fired when a request returns an error and bubbles up to the transaction object. note: consider using idbtransaction.onabort instead to handle non- successful completion of the transaction. note: this feature is available in web workers. syntax transaction.onerror = function(event) { ... }; 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. ...
...this feature is available in web workers. syntax transaction.onerror = function(event) { ... }; 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. note the transaction.onerror = function(event) { }; block, making use of transaction.error to help in reporting what went wrong when the transaction was unsuccessful. 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.</...
...ay: 24, month: "december", year: 2013, notified: "no" } ]; // open a read/write db transaction, ready for adding the data var transaction = db.transaction(["todolist"], "readwrite"); // report on the success of opening the transaction transaction.oncomplete = function(event) { note.innerhtml += '<li>transaction completed: database modification finished.</li>'; }; transaction.onerror = function(event) { note.innerhtml += '<li>transaction not opened due to error: ' + transaction.error + '</li>'; }; // create an object store on the transaction var objectstore = transaction.objectstore("todolist"); // add our newitem object to the object store var objectstorerequest = objectstore.add(newitem[0]); objectstorerequest.onsuccess = function(event) { // report t...
...And 3 more matches

RTCPeerConnectionIceErrorEvent.address - Web APIs
this address identifies the network interface on the local device which is being used to attempt to establish the connection to the remote peer. this can be useful on multi-homed systems—devices with more than one network connection—to determine which network interface is being used. ...
...this address identifies the network interface on the local device which is being used to attempt to establish the connection to the remote peer. ...
......
...And 3 more matches

ReadableByteStreamController.error() - Web APIs
living standard initial definition. ...
... living standard initial definition. ...
... living standard initial definition. ...
...And 3 more matches

SpeechRecognition: error event - Web APIs
the error event of the web speech api speechrecognition object is fired when a speech recognition error occurs. ...
... the error event of the web speech api speechrecognition object is fired when a speech recognition error occurs. ...
... the error event of the web speech api speechrecognition object is fired when a speech recognition error occurs. ...
...And 3 more matches

SpeechSynthesisUtterance: error event - Web APIs
the error event of the web speech api speechsynthesisutterance object is fired when an error occurs that prevents the utterance from being succesfully spoken. ...
... the error event of the web speech api speechsynthesisutterance object is fired when an error occurs that prevents the utterance from being succesfully spoken. ...
... the error event of the web speech api speechsynthesisutterance object is fired when an error occurs that prevents the utterance from being succesfully spoken. ...
...And 3 more matches

XMLHttpRequest: error event - Web APIs
the error event is fired when the request encountered an error. ...
... the error event is fired when the request encountered an error. ...
... the error event is fired when the request encountered an error. ...
...And 3 more matches

SyntaxError: return not in function - JavaScript
a return or yield statement is called outside of a function. maybe there are missing curly brackets somewhere? ...
... a return or yield statement is called outside of a function. maybe there are missing curly brackets somewhere? ...
... a return or yield statement is called outside of a function. maybe there are missing curly brackets somewhere? ...
...And 3 more matches

TypeError: can't redefine non-configurable property "x" - JavaScript
the configurable attribute controls whether the property can be deleted from the object and whether its attributes (other than writable) can be changed. ...
...the configurable attribute controls whether the property can be deleted from the object and whether its attributes (other than writable) can be changed. ...
...the configurable attribute controls whether the property can be deleted from the object and whether its attributes (other than writable) can be changed. ...
...And 3 more matches

TypeError: cyclic object value - JavaScript
the json format per se doesn't support object references (although an ietf draft exists), hence json.stringify() doesn't try to solve them and fails accordingly. ...
... the json format per se doesn't support object references (although an ietf draft exists), hence json.stringify() doesn't try to solve them and fails accordingly. ...
... the json format per se doesn't support object references (although an ietf draft exists), hence json.stringify() doesn't try to solve them and fails accordingly. ...
...And 3 more matches

SyntaxError: missing = in const declaration - JavaScript
it cannot change through re-assignment, and it can't be redeclared. ...
...it cannot change through re-assignment, and it can't be redeclared. ...
...it cannot change through re-assignment, and it can't be redeclared. ...
...And 3 more matches

SyntaxError: missing ) after condition - JavaScript
in any programming language, code needs to make decisions and carry out actions accordingly depending on different inputs. the if statement executes a statement if a specified condition is truthy. ...
...in any programming language, code needs to make decisions and carry out actions accordingly depending on different inputs. the if statement executes a statement if a specified condition is truthy. ...
...in any programming language, code needs to make decisions and carry out actions accordingly depending on different inputs. the if statement executes a statement if a specified condition is truthy. ...
...And 3 more matches

SyntaxError: missing ; before statement - JavaScript
the javascript exception "missing ; before statement" occurs when there is a semicolon (;) missing somewhere and can't be added by automatic semicolon insertion (asi). you need to provide a semicolon, so that javascript can parse the source code correctly. message syntaxerror: expected ';' (edge) syntaxerror: missing ; before statement (firefox) error type syntaxerror. what went wrong? there is a semicolon (;) missing somewhere. javascript statements must be terminated with semicolons. some of them are affected by automatic semicolon insertion (asi), but in this case you need to provide a semicolon, so that javascript can parse the source code correctly. however, oftentimes, this error is only a consequence of another error, like not escaping strings properly, or using var wrongly. you...
...colons. some of them are affected by automatic semicolon insertion (asi), but in this case you need to provide a semicolon, so that javascript can parse the source code correctly. however, oftentimes, this error is only a consequence of another error, like not escaping strings properly, or using var wrongly. you might also have too many parenthesis somewhere. carefully check the syntax when this error is thrown. examples unescaped strings this error can occur easily when not escaping strings properly and the javascript engine is expecting the end of your string already. ...
...equence of another error, like not escaping strings properly, or using var wrongly. you might also have too many parenthesis somewhere. carefully check the syntax when this error is thrown. examples unescaped strings this error can occur easily when not escaping strings properly and the javascript engine is expecting the end of your string already. for example: var foo = 'tom's bar'; // syntaxerror: missing ; before statement you can use double quotes, or escape the apostrophe: var foo = "tom's bar"; var foo = 'tom\'s bar'; declaring properties with var you cannot declare properties of an object or array with a var declaration. ...
...And 3 more matches

TypeError: can't delete non-configurable array element - JavaScript
when shortening an array, the elements beyond the new array length will be deleted, which failed in this situation. ...
...when shortening an array, the elements beyond the new array length will be deleted, which failed in this situation. ...
...when shortening an array, the elements beyond the new array length will be deleted, which failed in this situation. ...
...And 3 more matches

SyntaxError: redeclaration of formal parameter "x" - JavaScript
the same variable name occurs as a function parameter and is then redeclared using a let assignment in a function body again. ...
... the same variable name occurs as a function parameter and is then redeclared using a let assignment in a function body again. ...
... the same variable name occurs as a function parameter and is then redeclared using a let assignment in a function body again. ...
...And 3 more matches

AggregateError() constructor - JavaScript
the aggregateerror() constructor creates an error for several errors that need to be wrapped in a single error. syntax new aggregateerror(errors[, message]) parameters errors an iterable of errors, may not actually be error instances. messageoptional an optional human-readable description of the aggregate error. ...
... the aggregateerror() constructor creates an error for several errors that need to be wrapped in a single error. syntax new aggregateerror(errors[, message]) parameters errors an iterable of errors, may not actually be error instances. messageoptional an optional human-readable description of the aggregate error. ...
... the aggregateerror() constructor creates an error for several errors that need to be wrapped in a single error. syntax new aggregateerror(errors[, message]) parameters errors an iterable of errors, may not actually be error instances. messageoptional an optional human-readable description of the aggregate error. ...
...And 3 more matches

EvalError - JavaScript
the evalerror object indicates an error regarding the global eval() function. this exception is not thrown by javascript anymore, however the evalerror object remains for compatibility. constructor evalerror() creates a new evalerror object. instance properties evalerror.prototype.message error message. although ecma-262 specifies that evalerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. evalerror.prototype.name error name. inherited from error. evalerror.prototype.filename path to file that raised this error. inherited from error. evalerror.prototype.linenumber line number in file that raised this error. inherited from error. evalerror.prototype.columnnumber column number in line that raised this error. inherited from erro...
...key, it inherits error.prototype.message. evalerror.prototype.name error name. inherited from error. evalerror.prototype.filename path to file that raised this error. inherited from error. evalerror.prototype.linenumber line number in file that raised this error. inherited from error. evalerror.prototype.columnnumber column number in line that raised this error. inherited from error. evalerror.prototype.stack stack trace. inherited from error. examples evalerror is not used in the current ecmascript specification and will thus not be thrown by the runtime. however, the object itself remains for backwards compatibility with earlier versions of the specification. ...
...or.prototype.columnnumber column number in line that raised this error. inherited from error. evalerror.prototype.stack stack trace. inherited from error. examples evalerror is not used in the current ecmascript specification and will thus not be thrown by the runtime. however, the object itself remains for backwards compatibility with earlier versions of the specification. ...
...And 3 more matches

RangeError() constructor - JavaScript
the rangeerror() constructor creates an error when a value is not in the set or range of allowed values. syntax new rangeerror([message[, filename[, linenumber]]]) parameters message optional human-readable description of the error. ...
... creates an error when a value is not in the set or range of allowed values. syntax new rangeerror([message[, filename[, linenumber]]]) parameters message optional human-readable description of the error. ...
...filename[, linenumber]]]) parameters message optional human-readable description of the error. ...
...And 3 more matches

ReferenceError() constructor - JavaScript
the referenceerror object represents an error when a non-existent variable is referenced. syntax new referenceerror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error. filename optional optional. the name of the file containing the code that caused the exception. linenumber optional optional. the line number of the code that caused the exception. ...
...-existent variable is referenced. syntax new referenceerror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error. filename optional optional. the name of the file containing the code that caused the exception. linenumber optional optional. the line number of the code that caused the exception. ...
...ber]]]) parameters message optional optional. human-readable description of the error. filename optional optional. the name of the file containing the code that caused the exception. linenumber optional optional. the line number of the code that caused the exception. ...
...And 3 more matches

TypeError() constructor - JavaScript
the typeerror() constructor creates a new error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type. syntax new typeerror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error filename optional optional. the name of the file containing the code that caused the exception linenumber optional optional. ...
...ely) when a value is not of the expected type. syntax new typeerror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error filename optional optional. the name of the file containing the code that caused the exception linenumber optional optional. ...
...([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error filename optional optional. the name of the file containing the code that caused the exception linenumber optional optional. ...
...And 3 more matches

URIError() constructor - JavaScript
the urierror() constructor creates an error when a global uri handling function was used in a wrong way. syntax new urierror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error. filename optional optional. the name of the file containing the code that caused the exception. linenumber optional optional. the line number of the code that caused the exception. ...
...handling function was used in a wrong way. syntax new urierror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error. filename optional optional. the name of the file containing the code that caused the exception. linenumber optional optional. the line number of the code that caused the exception. ...
...e[, linenumber]]]) parameters message optional optional. human-readable description of the error. filename optional optional. the name of the file containing the code that caused the exception. linenumber optional optional. the line number of the code that caused the exception. ...
...And 3 more matches

Error Console - Archive of obsolete content
the error console is deprecated in firefox, and is now only made available if you set the devtools.errorconsole.enabled preference to true. use the web console instead, for web content, or the browser console for chrome content. the error console is a tool available in most mozilla-based applications that is used for reporting errors in the application chrome and in web pages user opens. it reports javascript-related errors and warnings, css errors and arbitrary messages from chrome code. in firefox, the error console can be opened from the tools menu or by ctrl-shift-j. for information about what javascript exceptions get logged into the error console, and how to make all exceptions get logged, read the article exception logging in javascript. see setting up extension development e...
... warning usually lets the program compile but warns of bad coding and suggests design flaws. ...
...an be opened from the tools menu or by ctrl-shift-j. for information about what javascript exceptions get logged into the error console, and how to make all exceptions get logged, read the article exception logging in javascript. see setting up extension development environment#development preferences for the preferences you should set if you want to see errors from firefox and extensions in the error console. before gecko 1.8.1 (firefox 2), it was called javascript console (see bug 265871). types of errors error usually a syntax error that prevents the program from compiling. warning usually lets the program compile but warns of bad coding and suggests design flaws. message very similar to warning, used very rarely. manipulating da...
...And 2 more matches

JS_ReportError
create a formatted error or warning message to pass to a user-defined error reporting function. this function can also raise a javascript exception which a currently executing script can catch. syntax void js_reporterror(jscontext *cx, const char *format, ...); bool js_reportwarning(jscontext *cx, const char *format, ...); name type description cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. format const char * format string to convert into an error message using js_vsmprintf. ... ... error message variables to insert into the format string. ...
... cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. format const char * format string to convert into an error message using js_vsmprintf. ... ... error message variables to insert into the format string. description js_reporterror is the simplest jsapi function for reporting errors. ...
...ime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. format const char * format string to convert into an error message using js_vsmprintf. ... ... error message variables to insert into the format string. description js_reporterror is the simplest jsapi function for reporting errors. first it builds an error message from the given sprintf-style format string and any additional arguments passed after it. the resulting error message is passed to the context's jserrorreporter callback, if any. if the caller is in a jsapi callback, js_reporterror also creates a new javascript error object and sets it to be the pending exception on cx. the callback must then return js_false to cause the exception to be pr...
...And 2 more matches

mozIStorageError
the mozistorageerror interface represents errors returned by the storage api, offering attributes to obtain the error code as well as a human-readable error message corresponding to the error that occurred. storage/public/mozistorageerror.idlscriptable please add a summary to this article. last changed in gecko 1.9.1 (firefox 3.5 / thunderbird 3.0 / seamonkey 2.0) inherits from: nsisupports attributes attribute type description message autf8string a human readable error string with details; this may be null if no details are available. read only. result long one of the error code values listed under constants on this page. constants constant value desc...
... corrupt 11 the database on disk is malformed. full 13 an insertion failed because the database is full. ...
... corrupt 11 the database on disk is malformed. full 13 an insertion failed because the database is full. ...
...And 2 more matches

nsIScriptError2
js/src/xpconnect/idl/nsiscripterror.idlscriptable represents javascript errors and warnings for use by the console service; augments nsiscripterror by adding a way to initialize the error with the window id of the outer window with which the error is associated. 1.0 66 introduced gecko 2.0 obsolete gecko 12.0 inherits from: nsiscripterror last changed in gecko 9.0 (firefox 9.0 / thunderbird 9.0 / seamonkey 2.6) in gecko 12.0 this interface was merged into the nsiscripterror interface. method overview void initwithwindowid(in wstring message, in wstring sourcename, in wstring sourceline, in pruint32 linenumber, in pruint32 columnnumber, in pruint32 flags, in string category, in unsigned long long innerwindowid); attribu...
...interface. method overview void initwithwindowid(in wstring message, in wstring sourcename, in wstring sourceline, in pruint32 linenumber, in pruint32 columnnumber, in pruint32 flags, in string category, in unsigned long long innerwindowid); attributes attribute type description innerwindowid unsigned long long the inner window id with which the error is associated. this is zero if the error was initialized by calling nsiscripterror.init() instead of initwithwindowid(). read only. outerwindowid unsigned long long the window id with which the error is associated. this is zero if the error was initialized by calling nsiscripterror.init() instead of initwithwindowid(). read only. timestamp long long elapsed time, in...
...age was created. read only. methods initwithwindowid() void init( in wstring message, in wstring sourcename, in wstring sourceline, in pruint32 linenumber, in pruint32 columnnumber, in pruint32 flags, in string category, in unsigned long long innerwindowid ); parameters message the text of the message to add to the log. sourcename the url of the file in which the error occurred. this will be a hyperlink in the javascript console, so you should use a real url. you may pass null if it's not applicable. sourceline the line number in the source file on which the error occurred. you are responsible for providing that line. you may pass null if you are lazy; that will prevent showing the source line in javascript console. linenumber the number of the line where t...
...And 2 more matches

NS_ERROR
summary macro throws a assertion (ns_assertion) with the text "error: (error text)", so writes this text to console (stderr) and to debug logs (nspr logging). ...
... summary macro throws a assertion (ns_assertion) with the text "error: (error text)", so writes this text to console (stderr) and to debug logs (nspr logging). ...
... summary macro throws a assertion (ns_assertion) with the text "error: (error text)", so writes this text to console (stderr) and to debug logs (nspr logging). ...
...And 2 more matches

AddressErrors.languageCode - Web APIs
this validation might be as simple as ensuring the text of the string is compliant with the syntax defined in bcp-47, or as detailed as actually verifying that the specified string matches a value from a database. ...
... this validation might be as simple as ensuring the text of the string is compliant with the syntax defined in bcp-47, or as detailed as actually verifying that the specified string matches a value from a database. ...
... this validation might be as simple as ensuring the text of the string is compliant with the syntax defined in bcp-47, or as detailed as actually verifying that the specified string matches a value from a database. ...
...And 2 more matches

HTMLMediaElement: error event - Web APIs
the error event is fired when the resource could not be loaded due to an error (for example, a network connectivity problem). ...
... the error event is fired when the resource could not be loaded due to an error (for example, a network connectivity problem). ...
... the error event is fired when the resource could not be loaded due to an error (for example, a network connectivity problem). ...
...And 2 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. ...
... the error event is fired on idbdatabase when a request returns an error and the event bubbles up to the connection object. ...
... the error event is fired on idbdatabase when a request returns an error and the event bubbles up to the connection object. ...
...And 2 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. ...
... the error event is fired on idbtransaction when a request returns an error and the event bubbles up to the transaction object. ...
... the error event is fired on idbtransaction when a request returns an error and the event bubbles up to the transaction object. ...
...And 2 more matches

MessagePort: messageerror event - Web APIs
the messageerror event is fired on a messageport object when it receives a message that can't be deserialized. ...
... the messageerror event is fired on a messageport object when it receives a message that can't be deserialized. ...
...ps://example.org'; const messagecontrol = document.queryselector('#message'); const channelmessagebutton = document.queryselector('#channel-message'); channelmessagebutton.addeventlistener('click', () => { myport.postmessage(messagecontrol.value); }) targetframe.postmessage('init', targetorigin, [channel.port2]); the target can receive the port and start listening for messages and message errors on it using code like this: window.addeventlistener('message', (event) => { const myport = event.ports[0]; myport.addeventlistener('message', (event) => { received.textcontent = event.data; }); myport.addeventlistener('messageerror', (event) => { console.error(event.data); }); myport.start(); }); note that the listener must call messageport.start() be...
...And 2 more matches

PayerErrors.email - Web APIs
the email property is included in a payererrors object if the paymentresponse.payeremail property failed validation; in this case, the property should contain a string describing how to correct the problem. if the payer's email address passed validation, this property is not included in the payererrors object. syntax payeremail = payererrors.email; value if validation of the payer's email address (paymentresponse.payeremail) found problems, this property should be set to a domstring that explains the validation problem and how to correct it. if the email address is valid, this property should be omitted from the payererrors object. ...
...= payererrors.email; value if validation of the payer's email address (paymentresponse.payeremail) found problems, this property should be set to a domstring that explains the validation problem and how to correct it. if the email address is valid, this property should be omitted from the payererrors object. ...
...alue if validation of the payer's email address (paymentresponse.payeremail) found problems, this property should be set to a domstring that explains the validation problem and how to correct it. if the email address is valid, this property should be omitted from the payererrors object. ...
...And 2 more matches

PayerErrors.name - Web APIs
the name property is included in a payererrors object if the payername returned in the response couldn't be validated. the value is a string explaining the problem. if the payer's name validated successfully, the name property is omitted from the payererrors object. syntax payername = payererrors.name; value if this property is present in the payererrors object, the payer's name couldn't be successfully validated, and the name property's value is a domstring explaining the error. this string will be displayed to the user by the user agent's payment handling user interface. if the payer's name is valid, this property is left out of the payererrors object. ...
...rrors object, the payer's name couldn't be successfully validated, and the name property's value is a domstring explaining the error. this string will be displayed to the user by the user agent's payment handling user interface. if the payer's name is valid, this property is left out of the payererrors object. ...
...s name couldn't be successfully validated, and the name property's value is a domstring explaining the error. this string will be displayed to the user by the user agent's payment handling user interface. if the payer's name is valid, this property is left out of the payererrors object. ...
...And 2 more matches

PayerErrors.phone - Web APIs
the phone property is found in a payererrors object if the payername returned in the response couldn't be validated as a valid phone number. the value of this property is a string explaining the problem. if the payer's phone number validated successfully, the phone property is omitted from the payererrors object. syntax payerphone = payererrors.phone; value if this property is present in the payererrors object, the payer's phone number couldn't be successfully validated, and the phone property's value is a domstring explaining the error. this string will be displayed to the user by the user agent's payment handling user interface as appropriate. if the phone number is valid, this property is omitted from the payererrors object. example function validatepayment(response) { c...
... phone number couldn't be successfully validated, and the phone property's value is a domstring explaining the error. this string will be displayed to the user by the user agent's payment handling user interface as appropriate. if the phone number is valid, this property is omitted from the payererrors object. ...
...e successfully validated, and the phone property's value is a domstring explaining the error. this string will be displayed to the user by the user agent's payment handling user interface as appropriate. if the phone number is valid, this property is omitted from the payererrors object. ...
...And 2 more matches

RTCIdentityErrorEvent - Web APIs
the rtcidentityerrorevent interface represents an error associated with the identity provider (idp). this is usually for an rtcpeerconnection. two events are sent with this type: idpassertionerror and idpvalidationerror. firefox implements this interface under the following name: rtcpeerconnectionidentityerrorevent. it is likely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. properties a rtcidentityerrorevent being an event, this event also implements these properties. rtcidentityerrorevent.idp read only is a domstring describing the domain name of the identity provider (idp) generating the error response. ...
...t. it is likely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. properties a rtcidentityerrorevent being an event, this event also implements these properties. rtcidentityerrorevent.idp read only is a domstring describing the domain name of the identity provider (idp) generating the error response. rtcidentityerrorevent.loginurl read only is a domstring giving the url where the user can complete the authentication. it can be null and is provided by the identity provider (idp). ...
...ng an event, this event also implements these properties. rtcidentityerrorevent.idp read only is a domstring describing the domain name of the identity provider (idp) generating the error response. rtcidentityerrorevent.loginurl read only is a domstring giving the url where the user can complete the authentication. it can be null and is provided by the identity provider (idp). rtcidentityerrorevent.protocol read only is a domstring describing the idp protocol in use. methods a rtcidentityerrorevent being an event, this event also implements these properties. there is no specific rtcidentityerrorevent method. ...
...And 2 more matches

RTCPeerConnectionIceErrorEvent - Web APIs
the rtcpeerconnectioniceerrorevent interface—based upon the event interface—provides details pertaining to an ice error announced by sending an icecandidateerror event to the rtcpeerconnection object. constructor rtcpeerconnectioniceerrorevent() creates and returns a new rtcpeerconnectioniceerrorevent object, with its type and other properties initialized as specified in the parameters. you will not normally create an object of this type yourself. ...
...rtaining to an ice error announced by sending an icecandidateerror event to the rtcpeerconnection object. constructor rtcpeerconnectioniceerrorevent() creates and returns a new rtcpeerconnectioniceerrorevent object, with its type and other properties initialized as specified in the parameters. you will not normally create an object of this type yourself. properties the rtcpeerconnectioniceerrorevent interface includes the properties found on the event interface, as well as the following properties: address read only a domstring providing the local ip address used to communicate with the stun or turn server being used to negotiate the connection, or null if the local ip address has not yet been exposed as part of a local ice candidate. ...
...f. properties the rtcpeerconnectioniceerrorevent interface includes the properties found on the event interface, as well as the following properties: address read only a domstring providing the local ip address used to communicate with the stun or turn server being used to negotiate the connection, or null if the local ip address has not yet been exposed as part of a local ice candidate. errorcode read only an unsigned integer value stating the numeric stun error code returned by the stun or turn server. if no host candidate can reach the server, this property is set to the number 701, which is outside the range of valid stun error codes. the 701 error is fired only once per server url, and only while the is icegatheringstate is gathering. ...
...And 2 more matches

Sensor.onerror - Web APIs
candidate recommendation initial definition. ...
... candidate recommendation initial definition. ...
... candidate recommendation initial definition. ...
...And 2 more matches

ServiceWorkerContainer.onerror - Web APIs
the onerror property of the serviceworkercontainer interface is an event handler fired whenever an error event occurs in the associated service workers. syntax serviceworkercontainer.onerror = function(errorevent) { ... ...
... the onerror property of the serviceworkercontainer interface is an event handler fired whenever an error event occurs in the associated service workers. syntax serviceworkercontainer.onerror = function(errorevent) { ... ...
... the onerror property of the serviceworkercontainer interface is an event handler fired whenever an error event occurs in the associated service workers. syntax serviceworkercontainer.onerror = function(errorevent) { ... ...
...And 2 more matches

Worker: messageerror event - Web APIs
the messageerror event is fired on a worker object when it receives a message that can't be deserialized. ...
... the messageerror event is fired on a worker object when it receives a message that can't be deserialized. ...
... the messageerror event is fired on a worker object when it receives a message that can't be deserialized. ...
...And 2 more matches

TypeError: invalid Array.prototype.sort argument - JavaScript
the argument of array.prototype.sort() is expected to be either undefined or a function which compares its operands. ...
... the argument of array.prototype.sort() is expected to be either undefined or a function which compares its operands. ...
... the argument of array.prototype.sort() is expected to be either undefined or a function which compares its operands. ...
...And 2 more matches

SyntaxError: missing ] after element list - JavaScript
likely there is a closing bracket ("]") or a comma (",") missing. ...
...likely there is a closing bracket ("]") or a comma (",") missing. ...
...likely there is a closing bracket ("]") or a comma (",") missing. ...
...And 2 more matches

SyntaxError: missing } after function body - JavaScript
also check if any closing curly brackets or parenthesis are in the correct order. ...
...also check if any closing curly brackets or parenthesis are in the correct order. ...
...also check if any closing curly brackets or parenthesis are in the correct order. ...
...And 2 more matches

SyntaxError: function statement requires a name - JavaScript
the javascript exception "function statement requires a name" occurs when there is a function statement in the code that requires a name. message syntax error: expected identifier (edge) syntaxerror: function statement requires a name [firefox] syntaxerror: unexpected token ( [chrome] error type syntaxerror what went wrong? there is a function statement in the code that requires a name. you'll need to check how functions are defined and if you need to provide a name for it, or if the function in question needs to be a function expression, an iife, or if the function code is placed correctly in this context at all. examples statements vs expressions a function statement (or function declaration) requires a name, this won't work: function () { return 'hello world'; } // syntaxerror:...
...ife (immediately invoked function expression), which is a function that runs as soon as it is defined. you will need a few more braces in this case: (function () { })(); labeled functions if you are using function labels, you will still need to provide a function name after the function keyword. this doesn't work: function greeter() { german: function () { return "moin"; } } // syntaxerror: function statement requires a name this would work, for example: function greeter() { german: function g() { return "moin"; } } object methods if you intended to create a method of an object, you will need to create an object. the following syntax without a name after the function keyword is valid then. var greeter = { german: function () { return "moin"; } }; callback syn...
...of an object, you will need to create an object. the following syntax without a name after the function keyword is valid then. ...
...And 2 more matches

EvalError() constructor - JavaScript
the evalerror constructor creates a new error regarding the global eval() function. this exception is not thrown by javascript anymore, however the evalerror object remains for compatibility. syntax new evalerror([message[, filename[, linenumber]]]) parameters message optional. human-readable description of the error filename optional. the name of the file containing the code that caused the exception linenumber optional. the line number of the code that caused the exception examples evalerror is not used in the current ecmascript specification and will thus not be thrown by the runtime. however, the object itself remains for backwards compatibility with earlier versions of the specification. ...
... optional. the name of the file containing the code that caused the exception linenumber optional. the line number of the code that caused the exception examples evalerror is not used in the current ecmascript specification and will thus not be thrown by the runtime. however, the object itself remains for backwards compatibility with earlier versions of the specification. ...
...file containing the code that caused the exception linenumber optional. the line number of the code that caused the exception examples evalerror is not used in the current ecmascript specification and will thus not be thrown by the runtime. however, the object itself remains for backwards compatibility with earlier versions of the specification. ...
...And 2 more matches

URIError - JavaScript
the urierror object represents an error when a global uri handling function was used in a wrong way. constructor urierror() creates a new urierror object. instance properties urierror.prototype.message error message. although ecma-262 specifies that urierror should provide its own message property, in spidermonkey, it inherits error.prototype.message. urierror.prototype.name error name. inherited from error. urierror.prototype.filename path to file that raised this error. inherited from error. urierror.prototype.linenumber line number in file that raised this error. inherited from error. urierror.prototype.columnnumber column number in line that raised this error. inherited from error. urierror.prototype.stack stack trace. inherited from error. examples catching an urie...
...rror. inherited from error. urierror.prototype.linenumber line number in file that raised this error. inherited from error. urierror.prototype.columnnumber column number in line that raised this error. inherited from error. urierror.prototype.stack stack trace. inherited from error. ...
...urierror.prototype.columnnumber column number in line that raised this error. inherited from error. urierror.prototype.stack stack trace. inherited from error. ...
...And 2 more matches

Error.description - Archive of obsolete content
non-standard. do not use! this object is a microsoft extension and is only supported in internet explorer. the error.description property returns or sets the descriptive string associated with a specific error. syntax object .description [= stringexpression] parameters object required. any instance of an error object. stringexpression optional. a string expression containing a description of the error. remarks the description property contains the error message string associated with a specific error. use the value contained in this property to alert a user to an error. the description and message properties provide the same functionality; the descriptionproperty provides backward compatibility; the message property complies with the ecma standard. example the following example...
...ssage string associated with a specific error. use the value contained in this property to alert a user to an error. the description and message properties provide the same functionality; the descriptionproperty provides backward compatibility; the message property complies with the ecma standard. example the following example illustrates the use of the description property. ...
...e the value contained in this property to alert a user to an error. the description and message properties provide the same functionality; the descriptionproperty provides backward compatibility; the message property complies with the ecma standard. example the following example illustrates the use of the description property. ...
..." "); // prints "'y' is undefined": document.write(e.message) } requirements supported in the following document modes: quirks, internet explorer 6 standards, internet explorer 7 standards, internet explorer 8 standards, internet explorer 9 standards, internet explorer 10 standards, internet explorer 11 standards. also supported in store apps (windows 8 and windows phone 8.1). applies to: error object see also number property (error) message property (error) name property (error) ...

Error.stackTraceLimit - Archive of obsolete content
the error.stacktracelimit property gets or sets the stack trace limit, which is equivalent to the number of error frames to display. the default limit is 10. syntax error.stacktracelimit remarks you can set the stacktracelimit property to any positive value between 0 and infinity. if the stacktracelimit property is set to 0 at the time an error is thrown, no stack trace is shown. if the property is set to a negative value or a non-numeric value, the value is converted to 0. if the stacktracelimit is set to infinity, the entire stack is shown. otherwise, touint32 is used to convert the value. example the following example shows how to set and then get the stack trace limit. ...
...operty is set to 0 at the time an error is thrown, no stack trace is shown. if the property is set to a negative value or a non-numeric value, the value is converted to 0. if the stacktracelimit is set to infinity, the entire stack is shown. otherwise, touint32 is used to convert the value. example the following example shows how to set and then get the stack trace limit. ...
...set to 0 at the time an error is thrown, no stack trace is shown. if the property is set to a negative value or a non-numeric value, the value is converted to 0. if the stacktracelimit is set to infinity, the entire stack is shown. otherwise, touint32 is used to convert the value. example the following example shows how to set and then get the stack trace limit. try { var err = new error("my error"); error.stacktracelimit = 7; throw err; } catch(e) { document.write("error stack trace limit: ") document.write(error.stacktracelimit); } requirements supported in internet explorer 10 and in windows 8.x store apps. ...
...nt32 is used to convert the value. example the following example shows how to set and then get the stack trace limit. ...

PR_GetErrorText
returns the actual number of bytes copied. ...
... returns the actual number of bytes copied. ...
... returns the actual number of bytes copied. ...
... returns the actual number of bytes copied. ...

BroadcastChannel: messageerror event - Web APIs
the messageerror event is fired on a broadcastchannel object when a message arrives on the channel that can't be deserialized. ...
... the messageerror event is fired on a broadcastchannel object when a message arrives on the channel that can't be deserialized. ...
... the messageerror event is fired on a broadcastchannel object when a message arrives on the channel that can't be deserialized. ...
... bubbles no cancelable no interface messageevent event handler property onmessageerror examples this code uses addeventlistener to listen for messages and errors: const channel = new broadcastchannel('example-channel'); channel.addeventlistener('message', (event) => { received.textcontent = event.data; }); channel.addeventlistener('messageerror', (event) => { console.error(event); }); the same, but using the onmessage and onmessageerror event handler properties: const channel = new broadcastchannel('example-channel'); channel.onmessage = (event) => { received.textcontent = event.data; }; channel.onmessageerror = (event) => { console.log(event); }; specifications specification status html living standard...

DOMError - Web APIs
the domerror interface describes an error object that contains an error name. properties domerror.name read only returns a domstring representing one of the error type names (see below). domerror.message read only returns a domstring representing a message or description associated with the given error type name. error types type description indexsizeerror the index is not in the allowed range (e.g. thrown in a range object). hierarchyrequesterror the node tree hierarchy is not correct. wrongdocumenterror the object is in the wrong document. invalidcharactererror the string contains invalid characters. nomodificationallowederror the object can not be modified. ...
... indexsizeerror the index is not in the allowed range (e.g. thrown in a range object). hierarchyrequesterror the node tree hierarchy is not correct. wrongdocumenterror the object is in the wrong document. invalidcharactererror the string contains invalid characters. nomodificationallowederror the object can not be modified. notfounderror the object can not be found here. notsupportederror the operation is not supported invalidstateerror the object is in an invalid state. syntaxerror the string did not match the expected pattern. invalidmodificationerror the object can not be modified in this way. ...
...wederror the object can not be modified. notfounderror the object can not be found here. notsupportederror the operation is not supported invalidstateerror the object is in an invalid state. syntaxerror the string did not match the expected pattern. invalidmodificationerror the object can not be modified in this way. namespaceerror the operation is not allowed by namespaces in xml invalidaccesserror the object does not support the operation or argument. typemismatcherror the type of the object does not match the expected type. securityerror the operation is insecure. networkerror a network error occurred. aborterror the operation was aborted. urlmismatc...
... the operation is not allowed by namespaces in xml invalidaccesserror the object does not support the operation or argument. typemismatcherror the type of the object does not match the expected type. securityerror the operation is insecure. networkerror a network error occurred. aborterror the operation was aborted. urlmismatcherror the given url does not match another url. quotaexceedederror the quota has been exceeded. timeouterror the operation timed out. invalidnodetypeerror the node is incorrect or has an incorrect ancestor for this operation. datacloneerror the object can not be cloned. ...

Document: fullscreenerror event - Web APIs
the fullscreenerror event is fired when the browser cannot switch to full-screen mode. bubbles yes cancelable no interface event event handler property onfullscreenerror as with the fullscreenchange event, two fullscreenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which owns that element. for some reasons that switching into full-screen mode might fail, see the guide to the fullscreen api. ...
...with the fullscreenchange event, two fullscreenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which owns that element. for some reasons that switching into full-screen mode might fail, see the guide to the fullscreen api. ...
..., two fullscreenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which owns that element. for some reasons that switching into full-screen mode might fail, see the guide to the fullscreen api. ...
...screenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which owns that element. for some reasons that switching into full-screen mode might fail, see the guide to the fullscreen api. ...

Element: error event - Web APIs
the error event is fired on an element object when a resource failed to load, or can't be used. for example, if a script has an execution error or an image can't be found or is invalid. bubbles no cancelable no interface event or uievent event handler property onerror the event object is a uievent instance if it was generated from a user interface element, or an event instance otherwise. ...
...t has an execution error or an image can't be found or is invalid. bubbles no cancelable no interface event or uievent event handler property onerror the event object is a uievent instance if it was generated from a user interface element, or an event instance otherwise. ...
... can't be found or is invalid. bubbles no cancelable no interface event or uievent event handler property onerror the event object is a uievent instance if it was generated from a user interface element, or an event instance otherwise. ...
...isplay: flex; align-items: center; justify-content: center; } .event-log { grid-area: log; } .event-log-contents { resize: none; } label, button { display: block; } button { height: 2rem; margin: .5rem; } img { width: 0; height: 0; } js const log = document.queryselector('.event-log-contents'); const badimg = document.queryselector('.bad-img'); badimg.addeventlistener('error', (event) => { log.textcontent = log.textcontent + `${event.type}: loading image\n`; console.log(event) }); const imgerror = document.queryselector('#img-error'); imgerror.addeventlistener('click', () => { badimg.setattribute('src', 'i-dont-exist'); }); result specifications specification status ui events working draft ...

Element: fullscreenerror event - Web APIs
the fullscreenerror event is fired when the browser cannot switch to full-screen mode. bubbles yes cancelable no interface event event handler property onfullscreenerror as with the fullscreenchange event, two fullscreenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which contains that element. for some reasons that switching into full-screen mode might fail, see the guide to the fullscreen api. ...
...the fullscreenchange event, two fullscreenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which contains that element. for some reasons that switching into full-screen mode might fail, see the guide to the fullscreen api. ...
... fullscreenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which contains that element. for some reasons that switching into full-screen mode might fail, see the guide to the fullscreen api. ...
...nerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which contains that element. for some reasons that switching into full-screen mode might fail, see the guide to the fullscreen api. ...

FileReader: error event - Web APIs
the error event is fired when the read failed due to an error (for example, because the file was not found or not readable). ...
... the error event is fired when the read failed due to an error (for example, because the file was not found or not readable). ...
...t readable). ...
... cancelable no interface progressevent event handler property filereader.onerror examples const fileinput = document.queryselector('input[type="file"]'); const reader = new filereader(); function handleselected(e) { const selectedfile = fileinput.files[0]; if (selectedfile) { reader.addeventlistener('error', () => { console.error(`error occurred reading file: ${selectedfile.name}`); }); reader.addeventlistener('load', () => { console.error(`file: ${selectedfile.name} read successfully`); }); reader.readasdataurl(selectedfile); } } fileinput.addeventlistener('change', handleselected); specifications specification status file api working draft...

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...
...e the notified value in the object to "yes" data.notified = "yes"; // create another request that inserts the item back // into the database var updatetitlerequest = objectstore.put(data); // when this new request succeeds, run the displaydata() // function again to update the display updatetitlerequest.onsuccess = function() { displaydata(); }; }; objectstoretitlerequest.onerror = function() { // if an error occurs with the request, log what it is console.log("there has been an error with retrieving your data: " + objectstoretitlerequest.error); // todo what about event parameter into onerror()? what will be inside of this event? }; specifications specification status comment indexed database api 2.0the definition of 'onerror' in that spec...
... recommendation 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. ...
...ion 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. ...

MediaError.code - Web APIs
the read-only property mediaerror.code returns a numeric value which represents the kind of error that occurred on a media element. to get a text string with specific diagnostic information, see mediaerror.message. syntax var myerror = mediaerror.code; value a numeric value indicating the general type of error which occurred. the possible values are described below, in media error code constants. media error code constants name value description media_err_aborted 1 the fetching of the associated resource was aborted by the user's request. media_err_network 2 some kind of network error occurred which prevented the media from being successfully fetched, despite having previously been available. media_err_decode 3 despite havin...
...value description media_err_aborted 1 the fetching of the associated resource was aborted by the user's request. media_err_network 2 some kind of network error occurred which prevented the media from being successfully fetched, despite having previously been available. media_err_decode 3 despite having previously been determined to be usable, an error occurred while trying to decode the media resource, resulting in an error. ...
...le. media_err_decode 3 despite having previously been determined to be usable, an error occurred while trying to decode the media resource, resulting in an error. media_err_src_not_supported 4 the associated resource or media provider object (such as a mediastream) has been found to be unsuitable. example this example creates a <video> element, establishes an error handler for it, and then sets the element's src attribute to the video resource to present in the element. ...
... trying to decode the media resource, resulting in an error. media_err_src_not_supported 4 the associated resource or media provider object (such as a mediastream) has been found to be unsuitable. example this example creates a <video> element, establishes an error handler for it, and then sets the element's src attribute to the video resource to present in the element. the error handler simply outputs a message var obj = document.createelement('video'); obj.onerror = function() {console.log("error with media: " + obj.error.code);} obj.src="https://example.com/blahblah.mp4"; specifications specification status comment html living standardthe definition of 'mediaerror.code' in that specification. living standard initial definition ...

MediaError - Web APIs
the mediaerror interface represents an error which occurred while handling media in an html media element based on htmlmediaelement, such as <audio> or <video>. a mediaerror object describes the error in general terms using a numeric code categorizing the kind of error, and a message, which provides specific diagnostics about what went wrong. properties this interface doesn't inherit any properties. mediaerror.code a number which represents the general type of error that occurred, as follows: name value description media_err_aborted 1 the fetching of the associated resource was aborted by the user's request. ...
...agnostics about what went wrong. properties this interface doesn't inherit any properties. mediaerror.code a number which represents the general type of error that occurred, as follows: name value description media_err_aborted 1 the fetching of the associated resource was aborted by the user's request. media_err_network 2 some kind of network error occurred which prevented the media from being successfully fetched, despite having previously been available. media_err_decode 3 despite having previously been determined to be usable, an error occurred while trying to decode the media resource, resulting in an error. media_err_src_not_supported 4 the associated resource or media provider object (such as a mediastrea...
...uccessfully fetched, despite having previously been available. media_err_decode 3 despite having previously been determined to be usable, an error occurred while trying to decode the media resource, resulting in an error. media_err_src_not_supported 4 the associated resource or media provider object (such as a mediastream) has been found to be unsuitable. mediaerror.message a domstring object containing a human-readable string which provides specific diagnostic information to help the reader understand the error condition which occurred; specifically, it isn't simply a summary of what the error code means, but actual diagnostic information to help in understanding what exactly went wrong. this text and its format is not defined by the specification and will...
... living standard ...

PaymentDetailsUpdate.error - Web APIs
this happens if both of the following are true: the paymentrequest specifies using its requestshipping property that shipping information is required. the paymentdetailsupdate object specifies no valid shipping options in its shippingoptions list. ...
...this happens if both of the following are true: the paymentrequest specifies using its requestshipping property that shipping information is required. the paymentdetailsupdate object specifies no valid shipping options in its shippingoptions list. ...
...this happens if both of the following are true: the paymentrequest specifies using its requestshipping property that shipping information is required. the paymentdetailsupdate object specifies no valid shipping options in its shippingoptions list. ...
... candidate recommendation initial definition. ...

PaymentValidationErrors - Web APIs
the paymentvalidationerrors dictionary represents objects providing information about any and all errors that occurred while processing a payment request. when validation of the paymentresponse returned by the paymentrequest.show() or paymentresponse.retry() methods fails, your code creates a paymentvalidationerrors object to pass into retry() so that the user agent knows what needs to be fixed and what if any error messages to display to the user. 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. ...
...() methods fails, your code creates a paymentvalidationerrors object to pass into retry() so that the user agent knows what needs to be fixed and what if any error messages to display to the user. 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 specific fields in the payment form. payer optional a payererrors compliant object which provides appropriate error messages for any of the fields describing the payer which failed validation. paymentmet...
...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 specific fields in the payment form. payer optional a payererrors compliant object which provides appropriate error messages for any of the fields describing the payer which failed validation. paymentmethod optional any payment method specific errors which may have occurred. this object's contents will vary depending on the payment used. for example, if the user chose to pay by credit card using the basic-card payment method, this is a basiccarderrors object. shippingaddress optional an addresserrors object which contains error messages for any of the fields in the shipping address that failed validation. example specifications ...
...s a basiccarderrors object. shippingaddress optional an addresserrors object which contains error messages for any of the fields in the shipping address that failed validation. example specifications specification status comment payment request api candidate recommendation initial definition. ...

RTCDataChannel.onerror - Web APIs
the rtcdatachannel.onerror property is an eventhandler which specifies a function to be called when the error event is received. when an error occurs on the data channel, the function receives as input an errorevent object describing the error which occurred. syntax rtcdatachannel.onerror = function; value a function which the browser will call to handle the error event when it occurs on the data channel. this function receives as its only input an errorevent object describing the event which was received. that event object, in turn, describes the error that took place. example in the example below, a data channel is established, and an onerror handler is added to it. ...
...rror = function; value a function which the browser will call to handle the error event when it occurs on the data channel. this function receives as its only input an errorevent object describing the event which was received. that event object, in turn, describes the error that took place. example in the example below, a data channel is established, and an onerror handler is added to it. the error handler passes information about the error to a ui library's alert box function to present an error message to the user. ...
...as received. that event object, in turn, describes the error that took place. example in the example below, a data channel is established, and an onerror handler is added to it. the error handler passes information about the error to a ui library's alert box function to present an error message to the user. let pc = new rtcpeerconnection(); let dc = pc.createdatachannel("playercontrol"); dc.onerror = function(event) { myuilibrary.doalertbox({ 'network error', // alert title 'the error "' + event.message + '" occurred while handling player control network messages.', event.filename, event.lineno, event.colno }); } /* ... */ specifications specification status comment webrtc 1.0: real-time communication between browsers...
...oalertbox({ 'network error', // alert title 'the error "' + event.message + '" occurred while handling player control network messages.', event.filename, event.lineno, event.colno }); } /* ... */ specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcdatachannel.onerror' in that specification. candidate recommendation initial specification. ...

RTCPeerConnection.onidpassertionerror - Web APIs
the rtcpeerconnection.onidpassertionerror event handler is a property containing the code to execute whent the idpassertionerror event, of type rtcidentityerrorevent, is received by this rtcpeerconnection. such an event is sent when the associated identity provider (idp) encounters an error while generating an identity assertion. this event handler is deprecated. you should instead detect idp assertion errors by handling rejection of the promise returned by rtcpeerconnection.peeridentity. syntax peerconnection.onidpassertionerror = function; values function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. an event handler always has one single parameter, containing the event, here of ...
...andling rejection of the promise returned by rtcpeerconnection.peeridentity. syntax peerconnection.onidpassertionerror = function; values function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. ...
...d by rtcpeerconnection.peeridentity. syntax peerconnection.onidpassertionerror = function; values function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. an event handler always has one single parameter, containing the event, here of type rtcidentityerrorevent. ...
... peerconnection.onidpassertionerror = function; values function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. an event handler always has one single parameter, containing the event, here of type rtcidentityerrorevent. ...

RTCPeerConnection.onidpvalidationerror - Web APIs
the rtcpeerconnection.onidpvalidationerror event handler is a property containing the code to execute whent the idpvalidationerror event, of type rtcidentityerrorevent, is received by this rtcpeerconnection. such an event is sent when the associated identity provider (idp) encounters an error while validating an identity assertion. this event handler is obsolete. you should instead detect idp validation errors by watching for the promise returned by rtcpeerconnection.peeridentity to be rejected. syntax peerconnection.onidpvalidationerror = function; values function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. an event handler always has one single parameter, containing the event, ...
... for the promise returned by rtcpeerconnection.peeridentity to be rejected. syntax peerconnection.onidpvalidationerror = function; values function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. ...
...ction.peeridentity to be rejected. syntax peerconnection.onidpvalidationerror = function; values function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. an event handler always has one single parameter, containing the event, here of type rtcidentityerrorevent. ...
...eerconnection.onidpvalidationerror = function; values function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. an event handler always has one single parameter, containing the event, here of type rtcidentityerrorevent. ...

SpeechRecognitionError.message - Web APIs
the message read-only property of the speechrecognitionerror interface returns a message describing the error in more detail. this speechrecognitionerror interface was renamed to speechrecognitionerrorevent in the web speech api specification. syntax var myerrormsg = event.message; value a domstring containing more details about the error that was raised. note that the spec does not define the exact wording of these messages — this is up to the implementors to decide upon. ...
...nterface was renamed to speechrecognitionerrorevent in the web speech api specification. syntax var myerrormsg = event.message; value a domstring containing more details about the error that was raised. note that the spec does not define the exact wording of these messages — this is up to the implementors to decide upon. ...
...eb speech api specification. syntax var myerrormsg = event.message; value a domstring containing more details about the error that was raised. note that the spec does not define the exact wording of these messages — this is up to the implementors to decide upon. ...
...n. syntax var myerrormsg = event.message; value a domstring containing more details about the error that was raised. note that the spec does not define the exact wording of these messages — this is up to the implementors to decide upon. ...

SpeechRecognitionError - Web APIs
the speechrecognitionerror interface of the web speech api represents error messages from the recognition service. this speechrecognitionerror interface was renamed to speechrecognitionerrorevent in the web speech api specification. properties speechrecognitionerror also inherits properties from its parent interface, event. speechrecognitionerror.error read only returns the type of error raised. speechrecognitionerror.message read only returns a message describing the error in more detail. ...
...cognitionerrorevent in the web speech api specification. properties speechrecognitionerror also inherits properties from its parent interface, event. speechrecognitionerror.error read only returns the type of error raised. speechrecognitionerror.message read only returns a message describing the error in more detail. ...
...roperties speechrecognitionerror also inherits properties from its parent interface, event. speechrecognitionerror.error read only returns the type of error raised. speechrecognitionerror.message read only returns a message describing the error in more detail. ...
...onerror also inherits properties from its parent interface, event. speechrecognitionerror.error read only returns the type of error raised. speechrecognitionerror.message read only returns a message describing the error in more detail. ...

Window: error event - Web APIs
the error event is fired on a window object when a resource failed to load or couldn't be used — for example if a script has an execution error. bubbles no cancelable no interface event or uievent event handler property onerror the event object is a uievent instance if it was generated from a user interface element, or an event instance otherwise. ...
...n't be used — for example if a script has an execution error. bubbles no cancelable no interface event or uievent event handler property onerror the event object is a uievent instance if it was generated from a user interface element, or an event instance otherwise. ...
...pt has an execution error. bubbles no cancelable no interface event or uievent event handler property onerror the event object is a uievent instance if it was generated from a user interface element, or an event instance otherwise. ...
...rol log"; } .controls { grid-area: control; display: flex; align-items: center; justify-content: center; } .event-log { grid-area: log; } .event-log-contents { resize: none; } label, button { display: block; } button { height: 2rem; margin: .5rem; } img { width: 0; height: 0; } js const log = document.queryselector('.event-log-contents'); window.addeventlistener('error', (event) => { log.textcontent = log.textcontent + `${event.type}: ${event.message}\n`; console.log(event) }); const scripterror = document.queryselector('#script-error'); scripterror.addeventlistener('click', () => { const badcode = 'const s;'; eval(badcode); }); result specifications specification status ui events working draft ...

CORS errors - HTTP
) 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, though. it's possible that the r...
...e, 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 app in question and open the developer tools. now try to reproduce the failing transaction and check the console if you are seeing a cors violation error message. it will probably look like this: the text of the error message will be something similar to the following: cross-origin request blocked: the same origin policy disallows reading the remote resource at https://some-url-here. (reason: additional information here). note: for security reasons, specifics about what went wrong with a cors request are not available to javascript code. al...
...ook like this: the text of the error message will be something similar to the following: cross-origin request blocked: the same origin policy disallows reading the remote resource at https://some-url-here. (reason: additional information here). note: for security reasons, specifics about what went wrong with a cors request are not available to javascript code. all the code knows is that an error occurred. the only way to determine what specifically went wrong is to look at the browser's console for details. cors error messages firefox's console displays messages in its console when requests fail due to cors. part of the error text is a "reason" message that provides added insight into what went wrong. the reason messages are listed below; click the message to open an article explaini...
...ed. the only way to determine what specifically went wrong is to look at the browser's console for details. cors error messages firefox's console displays messages in its console when requests fail due to cors. part of the error text is a "reason" message that provides added insight into what went wrong. the reason messages are listed below; click the message to open an article explaining the error in more detail and offering possible solutions. reason: cors disabled reason: cors request did not succeed reason: cors header ‘origin’ cannot be added reason: cors request external redirect not allowed reason: cors request not http reason: cors header ‘access-control-allow-origin’ missing reason: cors header ‘access-control-allow-origin’ does not match ‘xyz’ reason: cre...

SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead - JavaScript
javascript execution won't be halted. what went wrong? there is a deprecated source map syntax in a javascript source. ...
...javascript execution won't be halted. what went wrong? there is a deprecated source map syntax in a javascript source. ...
...javascript execution won't be halted. what went wrong? there is a deprecated source map syntax in a javascript source. ...
...javascript execution won't be halted. what went wrong? there is a deprecated source map syntax in a javascript source. ...

RangeError: invalid array length - JavaScript
the javascript exception "invalid array length" occurs when creating an array or an arraybuffer which has a length which is either negative or larger or equal to 232, or when setting the array.length property to a value which is either negative or larger or equal to 232. ...
... the javascript exception "invalid array length" occurs when creating an array or an arraybuffer which has a length which is either negative or larger or equal to 232, or when setting the array.length property to a value which is either negative or larger or equal to 232. ...
... the javascript exception "invalid array length" occurs when creating an array or an arraybuffer which has a length which is either negative or larger or equal to 232, or when setting the array.length property to a value which is either negative or larger or equal to 232. ...
...y length" occurs when creating an array or an arraybuffer which has a length which is either negative or larger or equal to 232, or when setting the array.length property to a value which is either negative or larger or equal to 232. message rangeerror: array length must be a finite positive integer (edge) rangeerror: invalid array length (firefox) rangeerror: invalid array length (chrome) rangeerror: invalid array buffer length (chrome) error type rangeerror what went wrong? an invalid array length might appear in these situations: when creating an array or an arraybuffer which has a length which is either negative or larger or equal to 232, or when setting the array.length property to a value which is either negative or larger or equal to 232. why are array and arraybuffer length...

URIError: malformed URI sequence - JavaScript
the javascript exception "malformed uri sequence" occurs when uri encoding or decoding wasn't successful. message urierror: the uri to be encoded contains invalid character (edge) urierror: malformed uri sequence (firefox) urierror: uri malformed (chrome) error type urierror what went wrong? uri encoding or decoding wasn't successful. an argument given to either the decodeuri, encodeuri, encodeuricomponent, or decodeuricomponent function was not valid, so that the function was unable encode or decode properly. examples encoding encoding replaces each instance of certain characters by one, two, three, or four escape sequences representing the utf-8 encoding of the character. an urierror will be thrown if there is an attempt to encode a surrogate which is not part of a high-low pair, ...
...ion was not valid, so that the function was unable encode or decode properly. examples encoding encoding replaces each instance of certain characters by one, two, three, or four escape sequences representing the utf-8 encoding of the character. an urierror will be thrown if there is an attempt to encode a surrogate which is not part of a high-low pair, for example: encodeuri('\ud800'); // "urierror: malformed uri sequence" encodeuri('\udfff'); // "urierror: malformed uri sequence" a high-low pair is ok. ...
...not part of a high-low pair, for example: encodeuri('\ud800'); // "urierror: malformed uri sequence" encodeuri('\udfff'); // "urierror: malformed uri sequence" a high-low pair is ok. for example: encodeuri('\ud800\udfff'); // "%f0%90%8f%bf" decoding decoding replaces each escape sequence in the encoded uri component with the character that it represents. ...
...; // "urierror: malformed uri sequence" encodeuri('\udfff'); // "urierror: malformed uri sequence" a high-low pair is ok. for example: encodeuri('\ud800\udfff'); // "%f0%90%8f%bf" decoding decoding replaces each escape sequence in the encoded uri component with the character that it represents. ...

SyntaxError: missing } after property list - JavaScript
might be in fact a missing curly bracket, but could also be a missing comma, for example. ...
...might be in fact a missing curly bracket, but could also be a missing comma, for example. ...
...might be in fact a missing curly bracket, but could also be a missing comma, for example. ...
...might be in fact a missing curly bracket, but could also be a missing comma, for example. ...

SyntaxError: missing formal parameter - JavaScript
your function declaration is missing valid parameters. in the declaration of a function, the parameters must be identifiers, not any value like numbers, strings, or objects. declaring functions and calling functions are two separate steps. declarations require identifier as parameters, and only when calling (invoking) the function, you provide the values the function should use. ...
... and may not start with a digit. an identifier differs from a string in that a string is data, while an identifier is part of the code. examples provide proper function parameters function parameters must be identifiers when setting up a function. ...
...ata, while an identifier is part of the code. examples provide proper function parameters function parameters must be identifiers when setting up a function. ...
...ction parameters must be identifiers when setting up a function. ...

SyntaxError: missing ) after argument list - JavaScript
the javascript exception "missing ) after argument list" occurs when there is an error with how a function is called. this might be a typo, a missing operator, or an unescaped string. message syntaxerror: expected ')' (edge) syntaxerror: missing ) after argument list (firefox) error type syntaxerror. what went wrong? ...
... the javascript exception "missing ) after argument list" occurs when there is an error with how a function is called. this might be a typo, a missing operator, or an unescaped string. message syntaxerror: expected ')' (edge) syntaxerror: missing ) after argument list (firefox) error type syntaxerror. what went wrong? ...
...error. what went wrong? ...
... argument for the log function to be just "pi: ". in that case, it should be terminated by a closing parenthesis. console.log('pi: ' math.pi); // syntaxerror: missing ) after argument list you can correct the log call by adding the "+" operator: console.log('pi: ' + math.pi); // "pi: 3.141592653589793" unterminated strings console.log('"java" + "script" = \"' + 'java' + 'script\"); // syntaxerror: missing ) after argument list here javascript thinks that you meant to have ); inside the string and ignores it, and it ends up not knowing that you meant the ); to end the function console.log. to fix this, we could put a' after the "script" string: console.log('"java" + "script" = \"' + 'java' + 'script\"'); // '"java" + "script" = "javascript"' ...

TypeError: "x" is read-only - JavaScript
the javascript strict mode-only exception "is read-only" occurs when a global variable or object property that was assigned to is a read-only property. message typeerror: assignment to read-only properties is not allowed in strict mode (edge) typeerror: "x" is read-only (firefox) typeerror: 0 is read-only (firefox) typeerror: cannot assign to read only property 'x' of #<object> (chrome) typeerror: cannot assign to read only property '0' of [object array] (chrome) error type typeerror what went wrong? the global variable or object property that was assigned to is a read-only property. (technically, it is a non-writable data property.) this error happens only in strict mode code. in non-strict code, the assignment is silently ignored. examples invalid cases read-only properties are no...
...ly property. (technically, it is a non-writable data property.) this error happens only in strict mode code. in non-strict code, the assignment is silently ignored. examples invalid cases read-only properties are not super common, but they can be created using object.defineproperty() or object.freeze(). 'use strict'; var obj = object.freeze({name: 'elsa', score: 157}); obj.score = 0; // typeerror 'use strict'; object.defineproperty(this, 'lung_count', {value: 2, writable: false}); lung_count = 3; // typeerror 'use strict'; var frozenarray = object.freeze([0, 1, 2]); frozenarray[0]++; // typeerror there are also a few read-only properties built into javascript. maybe you tried to redefine a mathematical constant. 'use strict'; math.pi = 4; // typeerror sorry, you can't do that. ...
...rror 'use strict'; var frozenarray = object.freeze([0, 1, 2]); frozenarray[0]++; // typeerror there are also a few read-only properties built into javascript. maybe you tried to redefine a mathematical constant. 'use strict'; math.pi = 4; // typeerror sorry, you can't do that. ...
...rray[0]++; // typeerror there are also a few read-only properties built into javascript. maybe you tried to redefine a mathematical constant. 'use strict'; math.pi = 4; // typeerror sorry, you can't do that. ...

SyntaxError: "use strict" not allowed in function with non-simple parameters - JavaScript
the javascript exception "'use strict' not allowed in function" occurs when a "use strict" directive is used at the top of a function with default parameters, rest parameters, or destructuring parameters. message edge: cannot apply strict mode on functions with non-simple parameter list firefox: syntaxerror: "use strict" not allowed in function with default parameter syntaxerror: "use strict" not allowed in function with rest parameter syntaxerror: "use strict" not allowed in function with destructuring parameter chrome: syntaxerror: illegal 'use strict' directive in function with non-simple parameter list error type syntaxerror. what went wrong? a "use strict" directive is written at the top of a function that has one of the following parameters: default parameters rest parameter...
...t" directive is written at the top of a function that has one of the following parameters: default parameters rest parameters destructuring parameters a "use strict" directive is not allowed at the top of such functions per the ecmascript specification. ...
... strict'; return a + b; } if the function should be in strict mode, and the entire script or enclosing function is also okay to be in strict mode, you can move the "use strict" directive outside of the function: 'use strict'; function sum(a = 1, b = 2) { return a + b; } function expression a function expression can use yet another workaround: var sum = function sum([a, b]) { // syntaxerror: "use strict" not allowed in function with destructuring parameter 'use strict'; return a + b; }; this can be converted to the following expression: var sum = (function() { 'use strict'; return function sum([a, b]) { return a + b; }; })(); arrow function if an arrow function needs to access the this variable, you can use the arrow function as the enclosing function: var callb...
...nction with destructuring parameter 'use strict'; return a + b; }; this can be converted to the following expression: var sum = (function() { 'use strict'; return function sum([a, b]) { return a + b; }; })(); arrow function if an arrow function needs to access the this variable, you can use the arrow function as the enclosing function: var callback = (...args) => { // syntaxerror: "use strict" not allowed in function with rest parameter 'use strict'; return this.run(args); }; this can be converted to the following expression: var callback = (() => { 'use strict'; return (...args) => { return this.run(args); }; })(); ...

TypeError: 'x' is not iterable - JavaScript
the javascript exception "is not iterable" occurs when the value which is given as the right hand-side of for…of or as argument of a function such as promise.all or typedarray.from, is not an iterable object. message typeerror: 'x' is not iterable (firefox, chrome) typeerror: 'x' is not a function or its return value is not iterable (chrome) error type typeerror what went wrong? the value which is given as the right hand-side of for…of or as argument of a function such as promise.all or typedarray.from, is not an iterable object. an iterable can be a built-in iterable type such as array, string or map, a generator result, or an object implementing the iterable protocol. examples iterating over object properties in javascript, objects are not iterable unless they implement the it...
...le type such as array, string or map, a generator result, or an object implementing the iterable protocol. examples iterating over object properties in javascript, objects are not iterable unless they implement the iterable protocol. therefore, you cannot use for…of to iterate over the properties of an object. var obj = { 'france': 'paris', 'england': 'london' }; for (let p of obj) { // typeerror: obj is not iterable // … } instead you have to use object.keys or object.entries, to iterate over the properties or entries of an object. var obj = { 'france': 'paris', 'england': 'london' }; // iterate over the property names: for (let country of object.keys(obj)) { var capital = obj[country]; console.log(country, capital); } for (const [country, capital] of object.entries(obj...
...s()) { let capital = map[country]; console.log(country, capital); } for (let capital of map.values()) console.log(capital); for (const [country, capital] of map.entries()) console.log(country, capital); iterating over a generator generators are functions you call to produce an iterable object. function* generate(a, b) { yield a; yield b; } for (let x of generate) // typeerror: generate is not iterable console.log(x); when they are not called, the function object corresponding to the generator is callable, but not iterable. calling a generator produces an iterable object which will iterate over the values yielded during the execution of the generator. function* generate(a, b) { yield a; yield b; } for (let x of generate(1,2)) console.log(x); itera...
...able custom iterables can be created by implementing the symbol.iterator method. you must be certain that your iterator method returns an object which is an iterator, which is to say it must have a next method. ...

getLastError - Archive of obsolete content
getlasterror returns the most recent nonzero error code. method of install object syntax int getlasterror (); parameters none. returns the most recent nonzero error code. for a list of possible values, see return codes. description use getlasterror method to obtain the most recent nonzero error code since initinstall or reseterror were called. this method allows you to defer checking for error codes each time you call addfile or adddirectory until the last addfile or adddirectory call. the getlasterror method does not return errors from methods that return objects, such as getfolder. ...
...e getlasterror method to obtain the most recent nonzero error code since initinstall or reseterror were called. this method allows you to defer checking for error codes each time you call addfile or adddirectory until the last addfile or adddirectory call. the getlasterror method does not return errors from methods that return objects, such as getfolder. ...
...odes each time you call addfile or adddirectory until the last addfile or adddirectory call. the getlasterror method does not return errors from methods that return objects, such as getfolder. ...

resetError - Archive of obsolete content
reseterror resets a saved error code to zero. method of install object syntax void reseterror (); parameters none. returns nothing. description the reseterror method resets any saved error code to zero. see getlasterror for additional information. ...
... reseterror resets a saved error code to zero. method of install object syntax void reseterror (); parameters none. returns nothing. description the reseterror method resets any saved error code to zero. see getlasterror for additional information. ...
... reseterror resets a saved error code to zero. method of install object syntax void reseterror (); parameters none. returns nothing. description the reseterror method resets any saved error code to zero. see getlasterror for additional information. ...

Syntax error - MDN Web Docs Glossary: Definitions of Web-related terms
an exception caused by the incorrect use of a pre-defined syntax. syntax errors are detected while compiling or parsing source code. for example, if you leave off a closing brace (}) when defining a javascript function, you trigger a syntax error. browser development tools display javascript and css syntax errors in the console. ...
... an exception caused by the incorrect use of a pre-defined syntax. syntax errors are detected while compiling or parsing source code. for example, if you leave off a closing brace (}) when defining a javascript function, you trigger a syntax error. browser development tools display javascript and css syntax errors in the console. ...
...an exception caused by the incorrect use of a pre-defined syntax. syntax errors are detected while compiling or parsing source code. for example, if you leave off a closing brace (}) when defining a javascript function, you trigger a syntax error. browser development tools display javascript and css syntax errors in the console. ...

mozbrowsererror
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. the mozbrowsererror event is fired when an error occurs while trying to load content within a browser <iframe>. general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event. bubbles read only boolean whether the event normally bub...
... the type of event. bubbles read only boolean whether the event normally bubbles or not. cancelable read only boolean whether the event is cancellable or not. details read only object a custom object. detail the detail property returns an anonymous javascript object with the following properties: type a domstring representing the type of error that occurred. possible values are: fatal(crash) unknownprotocolfound filenotfound dnsnotfound connectionfailure netinterrupt nettimeout cspblocked phishingblocked malwareblocked unwantedblocked offline malformeduri redirectloop unknownsockettype netreset notcached isprinting deniedportaccess proxyresolvefailure proxyconnectfailure contentencodingfail...
... unknownprotocolfound filenotfound dnsnotfound connectionfailure netinterrupt nettimeout cspblocked phishingblocked malwareblocked unwantedblocked offline malformeduri redirectloop unknownsockettype netreset notcached isprinting deniedportaccess proxyresolvefailure proxyconnectfailure contentencodingfailure remotexul unsafecontenttype corruptedcontenterror certerror other example var browser = document.queryselector("iframe"); browser.addeventlistener("mozbrowsererror", function( event ) { console.log("an error occurred:" + event.detail); }); related events mozbrowserasyncscroll mozbrowserclose mozbrowsercontextmenu mozbrowsericonchange mozbrowserloadend mozbrowserloadstart mozbrowserlocationchange mozbrowseropenwindow moz...

JSErrorFormatString
this article covers features introduced in spidermonkey 17 represent error message and type. syntax typedef struct jserrorformatstring { const char *format; uint16_t argcount; int16_t exntype; } jserrorformatstring; name type description format const char * the error format string in ascii. argcount uint16_t the number of arguments to expand in the formatted error message. exntype int16_t one of the jsexntype constants. description jserrorformatstring is a struct to represent error message and type, returned by js_reporterrornumber function. ...
...ion format const char * the error format string in ascii. argcount uint16_t the number of arguments to expand in the formatted error message. exntype int16_t one of the jsexntype constants. description jserrorformatstring is a struct to represent error message and type, returned by js_reporterrornumber function. ...
...the error format string in ascii. argcount uint16_t the number of arguments to expand in the formatted error message. exntype int16_t one of the jsexntype constants. description jserrorformatstring is a struct to represent error message and type, returned by js_reporterrornumber function. ...

JS_ErrorFromException
get or create jserrorreport from an exception object. syntax jserrorreport * js_errorfromexception(jscontext *cx, js::handleobject obj); name type description cx jscontext * pointer to a js context whose errors should be reported via your function. other contexts in the same runtime can have their own error reporting functions. obj js::handleobject an exception object. description if obj is an exception object, the exception will have (or be able to lazily create) an error report struct, and js_errorfromexception will return the address of that struct. otherwise, it returns nullptr. the lifetime of the error report struct that might be returned is the same as the lifetime of the exception object. ...
... an exception object. description if obj is an exception object, the exception will have (or be able to lazily create) an error report struct, and js_errorfromexception will return the address of that struct. otherwise, it returns nullptr. ...
.... description if obj is an exception object, the exception will have (or be able to lazily create) an error report struct, and js_errorfromexception will return the address of that struct. otherwise, it returns nullptr. ...

JS_GetErrorPrototype
this article covers features introduced in spidermonkey 38 return the original value of error.prototype. syntax jsobject * js_geterrorprototype(jscontext *cx); name type description cx jscontext * pointer to a js context whose errors should be reported via your function. other contexts in the same runtime can have their own error reporting functions. ...
...rs features introduced in spidermonkey 38 return the original value of error.prototype. syntax jsobject * js_geterrorprototype(jscontext *cx); name type description cx jscontext * pointer to a js context whose errors should be reported via your function. other contexts in the same runtime can have their own error reporting functions. description js_geterrorprototype returns the original value of error.prototype from the global object of the current compartment of cx. ...
... name type description cx jscontext * pointer to a js context whose errors should be reported via your function. other contexts in the same runtime can have their own error reporting functions. ...

Element.onfullscreenerror - Web APIs
the element interface's onfullscreenerror property is an event handler for the fullscreenerror event which is sent to the element when an error occurs while attempting to transition into or out of full-screen mode. syntax targetelement.onfullscreenerror = fullscreenerrorhandler; value an error handler for the fullscreenerror event. example this example attempts to switch into full-screen mode from outside a handler for a user-initiated event (such as a click or keypress event). ...
...to or out of full-screen mode. syntax targetelement.onfullscreenerror = fullscreenerrorhandler; value an error handler for the fullscreenerror event. example this example attempts to switch into full-screen mode from outside a handler for a user-initiated event (such as a click or keypress event). since full-screen mode changes are only permitted in response to a user input, this causes an error to occur, which triggers the delivery of the fullscreenerror event to the error handler, let elem = document.queryselector("video")}} elem.onfullscreenerror = function ( event ) { displaywarning("unable to switch into full-screen mode."); }; //.... elem.requestfullscreen(); specifications specification status comment fullscreen apithe definition of 'onfullscree...
...to occur, which triggers the delivery of the fullscreenerror event to the error handler, let elem = document.queryselector("video")}} elem.onfullscreenerror = function ( event ) { displaywarning("unable to switch into full-screen mode."); }; //.... elem.requestfullscreen(); specifications specification status comment fullscreen apithe definition of 'onfullscreenerror' in that specification. living standard initial definition. ...

GeolocationPositionError - Web APIs
the geolocationpositionerror interface represents the reason of an error occurring when using the geolocating device. properties the geolocationpositionerror interface doesn't inherit any property. geolocationpositionerror.code read only secure context returns an unsigned short representing the error code. the following values are possible: value associated constant description 1 permission_denied the acquisition of the geolocation information failed because the page didn't have the permission to do it. 2 position_unavailable the acquisition of the geolocation failed because at least one internal source of position returned an internal error. 3 timeout the time allowed to acquire the geolocation, ...
...idn't have the permission to do it. 2 position_unavailable the acquisition of the geolocation failed because at least one internal source of position returned an internal error. 3 timeout the time allowed to acquire the geolocation, defined by positionoptions.timeout information was reached before the information was obtained. geolocationpositionerror.message read only secure context returns a human-readable domstring describing the details of the error. specifications note that this is primarily intended for debugging use and not to be shown directly in a user interface. methods the geolocationpositionerror interface neither implements nor inherits any method. specifications specification status comment geol...
...an-readable domstring describing the details of the error. specifications note that this is primarily intended for debugging use and not to be shown directly in a user interface. methods the geolocationpositionerror interface neither implements nor inherits any method. specifications specification status comment geolocation apithe definition of 'geolocationpositionerror' in that specification. recommendation initial specification. ...

HTMLMediaElement.error - Web APIs
the htmlmediaelement.error is the mediaerror object for the most recent error, or null if there has not been an error. when an error event is received by the element, you can determine details about what happened by examining this object. syntax var myerror = htmlmediaelement.error; value a mediaerror object describing the most recent error to occur on the media element or null if no errors have occurred. example this example establishes a video element and adds an error handler to it; the error handler simply logs the details to console. ...
...mining this object. syntax var myerror = htmlmediaelement.error; value a mediaerror object describing the most recent error to occur on the media element or null if no errors have occurred. example this example establishes a video element and adds an error handler to it; the error handler simply logs the details to console. var videoelement = document.createelement('video'); videoelement.onerror = function() { console.log("error " + videoelement.error.code + "; details: " + videoelement.error.message); } videoelement.src = "https://example.com/bogusvideo.mp4"; specifications specification status comment html living standardthe definition of 'htmlmediaelement.error' in that specification. living standard html5the definition of 'htmlmediaelemen...
... function() { console.log("error " + videoelement.error.code + "; details: " + videoelement.error.message); } videoelement.src = "https://example.com/bogusvideo.mp4"; specifications specification status comment html living standardthe definition of 'htmlmediaelement.error' in that specification. living standard html5the definition of 'htmlmediaelement.error' in that specification. recommendation ...

MediaRecorderErrorEvent() - Web APIs
the mediarecordererrorevent() constructor creates a new mediarecordererrorevent object that represents an error that occurred during the recording of media by the mediastream recording api. in general, you won't create these yourself; they are delivered to your implementation of mediarecorder.onerror when errors occur while recording media. syntax var errorevent = new mediarecordererrorevent(errorinfo) parameters errorinfo an object describing the error object to be created. it must contain the error property at a minimum. error a domexception that describes the error that occurred. this object's name property should indicate the name of the error that occurred. the other fields may or may not be present. ...
...ent = new mediarecordererrorevent(errorinfo) parameters errorinfo an object describing the error object to be created. it must contain the error property at a minimum. error a domexception that describes the error that occurred. this object's name property should indicate the name of the error that occurred. the other fields may or may not be present. some user agents add to the error object other properties that provide information such as stack dumps, the name of the javascript file and the line number where the error occurred, and other debugging aids, but you should not rely on this information in a production environment. ...
...user agents add to the error object other properties that provide information such as stack dumps, the name of the javascript file and the line number where the error occurred, and other debugging aids, but you should not rely on this information in a production environment. specifications specification status comment mediastream recordingthe definition of 'mediarecordererrorevent()' in that specification. working draft initial definition. ...

RTCIdentityErrorEvent.idp - Web APIs
the read-only property rtcidentityerrorevent.idp returns the domstring describing the domain name of the identity provider (idp) generating the error response event. firefox implements the interface of this property under the following name: rtcpeerconnectionidentityerrorevent. it is likely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. ...
...ider (idp) generating the error response event. firefox implements the interface of this property under the following name: rtcpeerconnectionidentityerrorevent. it is likely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. ...
...kely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. ...

RTCPeerConnection.onicecandidateerror - Web APIs
the rtcpeerconnection.onicecandidateerror property is an eventhandler which specifies a function which is called to handle the icecandidateerror event when it occurs on an rtcpeerconnection instance. this event is fired when an error occurs during the ice candidate gathering process. syntax rtcpeerconnection.onicecandidateerror = eventhandler; value this should be set to a function you provide which is passed a single parameter: an rtcpeerconnectioniceerrorevent object describing the icecandidateerror event. the event offers properties describing the error to help you handle it appropriately. example pc.onicecandidateerror = function(event) { if (event.errorcode >= 300 && event.errorcode <= 699) { // stun errors are in the range 300-699. see rfc 5389, section 15.6 // for a l...
... an rtcpeerconnectioniceerrorevent object describing the icecandidateerror event. the event offers properties describing the error to help you handle it appropriately. example pc.onicecandidateerror = function(event) { if (event.errorcode >= 300 && event.errorcode <= 699) { // stun errors are in the range 300-699. see rfc 5389, section 15.6 // for a list of codes. turn adds a few more error codes; see // rfc 5766, section 15 for details. } else if (event.errorcode >= 700 && event.errorcode <= 799) { // server could not be reached; a specific error number is // provided but these are not yet specified. } } specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcpeerconnection.o...
... // rfc 5766, section 15 for details. } else if (event.errorcode >= 700 && event.errorcode <= 799) { // server could not be reached; a specific error number is // provided but these are not yet specified. } } specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcpeerconnection.onicecandidateerror' in that specification. candidate recommendation initial specification. ...

ReadableStreamDefaultController.error() - Web APIs
the error() method of the readablestreamdefaultcontroller interface causes any future interactions with the associated stream to error. note: the error() method can be called more than once, and can be called when the stream is not readable. syntax readablestreamdefaultcontroller.error(e); parameters e the error you want future interactions to fail with. return value undefined. exceptions typeerror the source object is not a readablestreamdefaultcontroller, or the stream is not readable for some other reason. examples the a readable stream with an underlying push source and backpressure support example in the spec provides a good example of using readablestreamdefaultcontroller.desiredsize to manually detect when the stream is full and apply backpressure, and also of using...
... living standard initial definition. ...
...ot a readablestreamdefaultcontroller, or the stream is not readable for some other reason. examples the a readable stream with an underlying push source and backpressure support example in the spec provides a good example of using readablestreamdefaultcontroller.desiredsize to manually detect when the stream is full and apply backpressure, and also of using error() to manually trigger a stream error if another part of the system it relies on fails. specifications specification status comment streamsthe definition of 'error()' in that specification. living standard initial definition. ...

SpeechSynthesisUtterance.onerror - Web APIs
}; examples var synth = window.speechsynthesis; var inputform = document.queryselector('form'); var inputtxt = document.queryselector('input'); var voiceselect = document.queryselector('select'); var voices = synth.getvoices(); ... ...
...}; examples var synth = window.speechsynthesis; var inputform = document.queryselector('form'); var inputtxt = document.queryselector('input'); var voiceselect = document.queryselector('select'); var voices = synth.getvoices(); ... ...
...voices(); ... inputform.onsubmit = function(event) { event.preventdefault(); var utterthis = new speechsynthesisutterance(inputtxt.value); var selectedoption = voiceselect.selectedoptions[0].getattribute('data-name'); for(i = 0; i < voices.length ; i++) { if(voices[i].name === selectedoption) { utterthis.voice = voices[i]; } } synth.speak(utterthis); utterthis.onerror = function(event) { console.log('an error has occurred with the speech synthesis: ' + event.error); } inputtxt.blur(); } specifications specification status comment web speech apithe definition of 'onerror' in that specification. draft ...

WebGLRenderingContext.getError() - Web APIs
the webglrenderingcontext.geterror() method of the webgl api returns error information. syntax glenum gl.geterror(); parameters none. return value constant description gl.no_error no error has been recorded. the value of this constant is 0. gl.invalid_enum an unacceptable value has been specified for an enumerated argument. the command is ignored and the error flag is set. gl.invalid_value a numeric argument is out of range. the command is ignored and the error flag is set. gl.invalid_operation the specified command is not allowed for the current state. the command is ignored and the error flag is set. gl.invalid_framebuffer_operation the currently bound framebuffer is not framebuffer complete when trying to ren...
...ified command is not allowed for the current state. the command is ignored and the error flag is set. gl.invalid_framebuffer_operation the currently bound framebuffer is not framebuffer complete when trying to render to or to read from it. gl.out_of_memory not enough memory is left to execute the command. gl.context_lost_webgl if the webgl context is lost, this error is returned on the first call to geterror. afterwards and until the context has been restored, it returns gl.no_error. examples gl.geterror(); // gl.no_error (0) gl.enable(gl.foobar); gl.geterror(); // gl.invalid_enum; specifications specification status comment webgl 1.0the definition of 'geterror' in that specification. recommendation initial definition...
...rwards and until the context has been restored, it returns gl.no_error. examples gl.geterror(); // gl.no_error (0) gl.enable(gl.foobar); gl.geterror(); // gl.invalid_enum; specifications specification status comment webgl 1.0the definition of 'geterror' in that specification. recommendation initial definition. opengl es 2.0the definition of 'glgeterror' in that specification. standard man page of the opengl api. ...

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. ...
...error 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. ...

500 Internal Server Error - HTTP
the hypertext transfer protocol (http) 500 internal server error server error response code indicates that the server encountered an unexpected condition that prevented it from fulfilling the request. this error response is a generic "catch-all" response. usually, this indicates the server cannot find a better 5xx error code to response. sometimes, server administrators log error responses like the 500 status code with more details about the request to prevent the error from happening again in the future. ...
...ed condition that prevented it from fulfilling the request. this error response is a generic "catch-all" response. usually, this indicates the server cannot find a better 5xx error code to response. sometimes, server administrators log error responses like the 500 status code with more details about the request to prevent the error from happening again in the future. ...
...e. usually, this indicates the server cannot find a better 5xx error code to response. sometimes, server administrators log error responses like the 500 status code with more details about the request to prevent the error from happening again in the future. ...

TypeError: can't access property "x" of "y" - JavaScript
the javascript exception "can't access property" occurs when property access was operated on undefined or null values. message typeerror: unable to get property {x} of undefined or null reference (edge) typeerror: can't access property {x} of {y} (firefox) typeerror: {y} is undefined, can't access property {x} of it (firefox) typeerror: {y} is null, can't access property {x} of it (firefox) examples: typeerror: x is undefined, can't access property "prop" of it typeerror: x is null, can't access property "prop" of it typeerror: can't access property "prop" of undefined typeerror: can't access property "prop" of null error type typeerror. what went wrong? the property access was operated on undefined or null value. examples invalid cases // undefined and null cases on which the subst...
... if (typeof foo !== 'undefined') { // now we know that foo is defined, we are good to go. ...
... if (typeof foo !== 'undefined') { // now we know that foo is defined, we are good to go. ...

TypeError: can't define property "x": "obj" is not extensible - JavaScript
the javascript exception "can't define property "x": "obj" is not extensible" occurs when object.preventextensions() marked an object as no longer extensible, so that it will never have properties beyond the ones it had at the time it was marked as non-extensible. message typeerror: cannot create property for a non-extensible object (edge) typeerror: can't define property "x": "obj" is not extensible (firefox) typeerror: cannot define property: "x", object is not extensible. (chrome) error type typeerror what went wrong? usually, an object is extensible and new properties can be added to it. however, in this case object.preventextensions() marked an object as no longer extensible, so that it will never have properties beyond the ones it had at the time it was marked as non-extensible. ...
...s extensible and new properties can be added to it. however, in this case object.preventextensions() marked an object as no longer extensible, so that it will never have properties beyond the ones it had at the time it was marked as non-extensible. examples adding new properties to a non-extensible objects in strict mode, attempting to add new properties to a non-extensible object throws a typeerror. in sloppy mode, the addition of the "x" property is silently ignored. 'use strict'; var obj = {}; object.preventextensions(obj); obj.x = 'foo'; // typeerror: can't define property "x": "obj" is not extensible in both, strict mode and sloppy mode, a call to object.defineproperty() throws when adding a new property to a non-extensible object. var obj = { }; object.preventextensions(obj); ob...
...tly ignored. 'use strict'; var obj = {}; object.preventextensions(obj); obj.x = 'foo'; // typeerror: can't define property "x": "obj" is not extensible in both, strict mode and sloppy mode, a call to object.defineproperty() throws when adding a new property to a non-extensible object. var obj = { }; object.preventextensions(obj); object.defineproperty(obj, 'x', { value: "foo" } ); // typeerror: can't define property "x": "obj" is not extensible to fix this error, you will either need to remove the call to object.preventextensions() entirely, or move it to a position so that the property is added earlier and only later the object is marked as non-extensible. of course you can also remove the property that was attempted to be added, if you don't need it. 'use strict'; var obj = {}; o...

TypeError: property "x" is non-configurable and can't be deleted - JavaScript
the javascript exception "property is non-configurable and can't be deleted" occurs when it was attempted to delete a property, but that property is non-configurable. message typeerror: calling delete on 'x' is not allowed in strict mode (edge) typeerror: property "x" is non-configurable and can't be deleted. (firefox) typeerror: cannot delete property 'x' of #<object> (chrome) error type typeerror in strict mode only. what went wrong? it was attempted to delete a property, but that property is non-configurable. the configurable attribute controls whether the property can be deleted from the object and whether its attributes (other than writable) can be changed. this error happens only in strict mode code. in non-strict code, the operation returns false. examples attempting to delete...
...writable) can be changed. this error happens only in strict mode code. in non-strict code, the operation returns false. examples attempting to delete non-configurable properties non-configurable properties are not super common, but they can be created using object.defineproperty() or object.freeze(). 'use strict'; var obj = object.freeze({name: 'elsa', score: 157}); delete obj.score; // typeerror 'use strict'; var obj = {}; object.defineproperty(obj, 'foo', {value: 2, configurable: false}); delete obj.foo; // typeerror 'use strict'; var frozenarray = object.freeze([0, 1, 2]); frozenarray.pop(); // typeerror there are also a few non-configurable properties built into javascript. maybe you tried to delete a mathematical constant. ...
...e; // typeerror 'use strict'; var obj = {}; object.defineproperty(obj, 'foo', {value: 2, configurable: false}); delete obj.foo; // typeerror 'use strict'; var frozenarray = object.freeze([0, 1, 2]); frozenarray.pop(); // typeerror there are also a few non-configurable properties built into javascript. maybe you tried to delete a mathematical constant. ...

SyntaxError: applying the 'delete' operator to an unqualified name is deprecated - JavaScript
the javascript strict mode-only exception "applying the 'delete' operator to an unqualified name is deprecated" occurs when variables are attempted to be deleted using the delete operator. message syntaxerror: calling delete on expression not allowed in strict mode (edge) syntaxerror: applying the 'delete' operator to an unqualified name is deprecated (firefox) syntaxerror: delete of an unqualified identifier in strict mode. (chrome) error type syntaxerror in strict mode only. what went wrong? normal variables in javascript can't be deleted using the delete operator. in strict mode, an attempt to delete a variable will throw an error and is not allowed. the delete operator can only delete properties on an object. object properties are "qualified" if they are configurable. unlike what ...
... error and is not allowed. the delete operator can only delete properties on an object. object properties are "qualified" if they are configurable. unlike what common belief suggests, the delete operator has nothing to do with directly freeing memory. memory management is done indirectly via breaking references, see the memory management page and the delete operator page for more details. this error only happens in strict mode code. in non-strict code, the operation just returns false. examples freeing the contents of a variable attempting to delete a plain variable, doesn't work in javascript and it throws an error in strict mode: 'use strict'; var x; // ... ...
...aking references, see the memory management page and the delete operator page for more details. this error only happens in strict mode code. in non-strict code, the operation just returns false. examples freeing the contents of a variable attempting to delete a plain variable, doesn't work in javascript and it throws an error in strict mode: 'use strict'; var x; // ... delete x; // syntaxerror: applying the 'delete' operator to an unqualified name // is deprecated to free the contents of a variable, you can set it to null: 'use strict'; var x; // ... x = null; // x can be garbage collected ...

SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated - JavaScript
the javascript strict mode-only exception "0-prefixed octal literals and octal escape sequences are deprecated; for octal literals use the "0o" prefix instead" occurs when deprecated octal literals and octal escape sequences are used. message syntaxerror: octal numeric literals and escape characters not allowed in strict mode (edge) syntaxerror: "0"-prefixed octal literals and octal escape sequences are deprecated; for octal literals use the "0o" prefix instead error type syntaxerror in strict mode only. what went wrong? octal literals and octal escape sequences are deprecated and will throw a syntaxerror in strict mode. with ecmascript 2015 and later, the standardized syntax uses a leading zero followed by a lowercase or uppercase latin letter "o" (0o or 0o). examples "0"-prefixed oc...
... "0o" prefix instead error type syntaxerror in strict mode only. what went wrong? ...
...cated and will throw a syntaxerror in strict mode. with ecmascript 2015 and later, the standardized syntax uses a leading zero followed by a lowercase or uppercase latin letter "o" (0o or 0o). ...

SyntaxError: test for equality (==) mistyped as assignment (=)? - JavaScript
what went wrong? there was an assignment (=) when you would normally expect a test for equality (==). to help debugging, javascript (with strict warnings enabled) warns about this pattern. ...
... what went wrong? there was an assignment (=) when you would normally expect a test for equality (==). to help debugging, javascript (with strict warnings enabled) warns about this pattern. ...
... what went wrong? there was an assignment (=) when you would normally expect a test for equality (==). to help debugging, javascript (with strict warnings enabled) warns about this pattern. ...

SyntaxError: missing name after . operator - JavaScript
you will have to specify the name of the property that you want to access. for computed property access, you might need to change your property access from using a dot to using square brackets. these will allow you to compute an expression. maybe you intended to do concatenation instead? a plus operator (+) is needed in that case. ...
...ute an expression. maybe you intended to do concatenation instead? a plus operator (+) is needed in that case. please see the examples below. examples property access property accessors in javascript use either the dot (.) or square brackets ([]), but not both. square brackets allow computed property access. var obj = { foo: { bar: "baz", bar2: "baz2" } }; var i = 2; obj.[foo].[bar] // syntaxerror: missing name after . operator obj.foo."bar"+i; // syntaxerror: missing name after . operator to fix this code, you need to access the object like this: obj.foo.bar; // "baz" // or alternatively obj["foo"]["bar"]; // "baz" // computed properties require square brackets obj.foo["bar" + i]; // "baz2" property access vs. concatenation if you are coming from another programming language (like...
...operator instead you need to use a plus sign for concatenation: console.log("hello" + "world"); ...

TypeError: "x" is not a constructor - JavaScript
the javascript exception "is not a constructor" occurs when there was an attempt to use an object or a variable as a constructor, but that object or variable is not a constructor. message typeerror: object doesn't support this action (edge) typeerror: "x" is not a constructor typeerror: math is not a constructor typeerror: json is not a constructor typeerror: symbol is not a constructor typeerror: reflect is not a constructor typeerror: intl is not a constructor typeerror: atomics is not a constructor error type typeerror what went wrong? there was an attempt to use an object or a variable as a constructor, but that object or variable is not a constructor. see constructor or the new operator for more information on what a constructor is. there are many global objects, like string or a...
... are many global objects, like string or array, which are constructable using new. however, some global objects are not and their properties and methods are static. the following javascript standard built-in objects are not a constructor: math, json, symbol, reflect, intl, atomics. generator functions cannot be used as constructors either. examples invalid cases var car = 1; new car(); // typeerror: car is not a constructor new math(); // typeerror: math is not a constructor new symbol(); // typeerror: symbol is not a constructor function* f() {}; var obj = new f; // typeerror: f is not a constructor a car constructor suppose you want to create an object type for cars. you want this type of object to be called car, and you want it to have properties for make, model, and year. to do th...
...= make; this.model = model; this.year = year; } now you can create an object called mycar as follows: var mycar = new car('eagle', 'talon tsi', 1993); in promises when returning an immediately-resolved or immediately-rejected promise, you do not need to create a new promise(...) and act on it. ...

ReferenceError: assignment to undeclared variable "x" - JavaScript
the javascript strict mode-only exception "assignment to undeclated variable" occurs when the value has been assigned to an undeclared variable. message referenceerror: assignment to undeclared variable "x" (firefox) referenceerror: "x" is not defined (chrome) referenceerror: variable undefined in strict mode (edge) error type referenceerror warning in strict mode only. what went wrong? a value has been assigned to an undeclared variable. in other words, there was an assignment without the var keyword. there are some differences between declared and undeclared variables, which might lead to unexpected results and that's why javascript presents an error in strict mode. three things to note about declared and undeclared variables: declared variables are constrained in the execution co...
...lared variables are always global. declared variables are created before any code is executed. undeclared variables do not exist until the code assigning to them is executed. declared variables are a non-configurable property of their execution context (function or global). undeclared variables are configurable (e.g. can be deleted). for more details and examples, see the var reference page. ...
...declared variables are configurable (e.g. can be deleted). for more details and examples, see the var reference page. errors about undeclared variable assignments occur in strict mode code only. in non-strict code, they are silently ignored. examples invalid cases in this case, the variable "bar" is an undeclared variable. function foo() { 'use strict'; bar = true; } foo(); // referenceerror: assignment to undeclared variable bar valid cases to make "bar" a declared variable, you can add the var keyword in front of it. function foo() { 'use strict'; var bar = true; } foo(); ...

error - Archive of obsolete content
read only. cancelable boolean is it possible to cancel the event? ...
...get (dom element) the event target (the topmost target in the dom tree). read only. type string the type of event. read only. canbubble boolean does the event normally bubble? read only. cancelable boolean is it possible to cancel the event? read only. related events checking noupdate downloading progress cached updateready obsolete error ...

onerror - Archive of obsolete content
...
... ...

onerrorcommand - Archive of obsolete content
...
... ...

error-icon - Archive of obsolete content
this will typically be a red "x" icon. ...
...this will typically be a red "x" icon. ...

PR_SetErrorText
sets the text associated with an error. syntax #include <prerror.h> void pr_seterrortext(printn textlength, const char *text) parameters the function has these parameters: textlength the length of the text in the text. may be null. if not null, and if text is zero, the string is assumed to be a null-terminated c string. otherwise the text is assumed to be the length specified and to possibly include null characters (as might occur in a multilingual string). text the text to associate with the error. description the text is copied into the thread structure and remains there until the next call to pr_seterror. if there is error text already present in the thread, the previous value is first deleted. the new value is copied into storage allocated and owned by nspr and remains th...
...t occur in a multilingual string). text the text to associate with the error. description the text is copied into the thread structure and remains there until the next call to pr_seterror. if there is error text already present in the thread, the previous value is first deleted. the new value is copied into storage allocated and owned by nspr and remains there until the next call to pr_seterror or another call to pr_seterrortext. nspr makes no use of this function. clients may use it for their own purposes. ...

nsISSLErrorListener
security/manager/ssl/public/nsisslerrorlistener.idlscriptable a mechanism to report a broken ssl connection. 1.0 66 introduced gecko 1.9 inherits from: nsisupports last changed in gecko 1.9 (firefox 3) note: the recipient of this ssl status notification should not block. method overview boolean notifysslerror(in nsiinterfacerequestor socketinfo, in print32 error, in autf8string targetsite); methods notifysslerror() called in case of an ssl error. boolean notifysslerror( in nsiinterfacerequestor socketinfo, in print32 error, in autf8string targetsite ); parameters socketinfo a network communication context that can be used to obtain more information about the active connection. error the code associated with the error. the ssl status object that de...
... in autf8string targetsite ); parameters socketinfo a network communication context that can be used to obtain more information about the active connection. error the code associated with the error. the ssl status object that describes the problem(s). targetsite the site name that was used to open the current connection. return value the consumer shall return true if it wants to suppress the error message related to the error (the connection will still get canceled). see also nsisockettransport ...

AddressErrors.addressLine - Web APIs
an object based on addresserrors includes an addressline property when validation of the address finds one or more errors in the array of strings in the address's addressline. the returned string explains the error and should offer suggestions for how to correct it. syntax var addresslineerror = addresserrors.addressline; value if an error occurred during validation of the address due to one of the strings in the addressline array having an invalid value, this property is set to a domstring providing a human-readable error message explaining the validation error. the text should also include, when possible, advice about how to go about correcting the error. ...
...ne of the strings in the addressline array having an invalid value, this property is set to a domstring providing a human-readable error message explaining the validation error. the text should also include, when possible, advice about how to go about correcting the error. if the paymentaddress object's addressline property was determined to be valid, this property is not included in the addresserrors dictionary. specifications specification status comment payment request apithe definition of 'addresserrors.addressline' in that specification. candidate recommendation initial definition. ...

AddressErrors.dependentLocality - Web APIs
an object based on addresserrors includes a dependentlocality property when the address's dependentlocality property couldn't be validated. the returned string explains the error and should offer suggestions for how to correct it. syntax var localityerror = addresserrors.dependentlocality; value if the value specified in the paymentaddress object's dependentlocality property could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. if the dependentlocality value was validated successfully, this property is not included in the addresserrors object. ...
...ty could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. if the dependentlocality value was validated successfully, this property is not included in the addresserrors object. specifications specification status comment payment request apithe definition of 'addresserrors.dependentlocality' in that specification. candidate recommendation initial definition. ...

AddressErrors.organization - Web APIs
an object based on addresserrors includes an organization property when the address's organization property couldn't be validated. the returned string explains the error and should offer suggestions for how to correct it. syntax var organizationerror = addresserrors.organization; value if the value specified in the paymentaddress object's organization property could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. for example, if validation simply ensures that only permitted characters are included in the organization's name, this might return a string such as "the organization name may only contain the letters a-z, digits, spaces, and commas." if the organization value was validat...
...f the validation error and offers suggestions for correcting it. for example, if validation simply ensures that only permitted characters are included in the organization's name, this might return a string such as "the organization name may only contain the letters a-z, digits, spaces, and commas." if the organization value was validated successfully, this property is not included in the addresserrors object. specifications specification status comment payment request apithe definition of 'addresserrors.organization' in that specification. candidate recommendation initial definition. ...

Console.error() - Web APIs
parameters obj1 ... objn a list of javascript objects to output. the string representations of each of these objects are appended together in the order listed and output. msg a javascript string containing zero or more substitution strings. subst1 ... substn javascript objects with which to replace substitution strings within msg. this gives you additional control over the format of the output. ...
... containing zero or more substitution strings. subst1 ... substn javascript objects with which to replace substitution strings within msg. this gives you additional control over the format of the output. see outputting text to the console in the documentation of console for details. specifications specification status comment console apithe definition of 'console.error()' in that specification. living standard initial definition ...

Document.onfullscreenerror - Web APIs
the document.onfullscreenerror property is an event handler for the fullscreenerror event that is sent to the document when it fails to transition into full-screen mode after a prior call to element.requestfullscreen(). syntax targetdocument.onfullscreenerror = fullscreenerrorhandler; value an event handler for the fullscreenerror event. example this example attempts to call requestfullscreen() outside of an event handler. since requestfullscreen() can only be called in response to user action, for security reasons, this will fail, causing the fullscreenerror to be sent to the document. document.onfullscreenerror = function ( event ) { displaywarning("unable to switch into full-screen mode."); }; //.... document.documentelement.requestfullscreen(); specifications speci...
...to user action, for security reasons, this will fail, causing the fullscreenerror to be sent to the document. document.onfullscreenerror = function ( event ) { displaywarning("unable to switch into full-screen mode."); }; //.... document.documentelement.requestfullscreen(); specifications specification status comment fullscreen apithe definition of 'onfullscreenerror' in that specification. living standard initial definition. ...

GeolocationPositionError.code - Web APIs
the geolocationpositionerror.code read-only property is an unsigned short representing the error code. syntax let typeerr = geolocationpositionerrorinstance.code value an unsigned short representing the error code. the following values are possible: value associated constant description 1 permission_denied the acquisition of the geolocation information failed because the page didn't have the permission to do it. 2 position_unavailable the acquisition of the geolocation failed because one or several internal sources of position returned an internal error. 3 timeout the time allowed to acquire the geolocation, defined by positionoptions.timeout information that was reached before the information was obtained. ...
... of the geolocation failed because one or several internal sources of position returned an internal error. 3 timeout the time allowed to acquire the geolocation, defined by positionoptions.timeout information that was reached before the information was obtained. specifications specification status comment geolocation apithe definition of 'positionerror.code' in that specification. recommendation initial definition ...

HTMLCanvasElement: webglcontextcreationerror event - Web APIs
the webglcontextcreationerror event of the webgl api is fired if the user agent is unable to create a webglrenderingcontext context. this event has a webglcontextevent.statusmessage property, which can contain a platform dependent string with more information about the failure. ...
... context. this event has a webglcontextevent.statusmessage property, which can contain a platform dependent string with more information about the failure. bubbles yes cancelable yes interface webglcontextevent event handler property none example var canvas = document.getelementbyid('canvas'); canvas.addeventlistener('webglcontextcreationerror', function(e) { console.log(e.statusmessage || 'unknown error'); }, false); var gl = canvas.getcontext('webgl'); // logs statusmessage or "unknown error" if unable to create webgl context specifications specification status comment webgl 1.0the definition of 'webglcontextcreationerror' in that specification. recommendation initial definition. ...

OverconstrainedError - Web APIs
the overconstrainederror interface of the media capture and streams api indicates that the set of desired capabilities for the current mediastreamtrack cannot currently be met. when this event is thrown on a mediastreamtrack, it is muted until either the current constraints can be established or until satisfiable constraints are applied. constructor overconstrainederror.overconstrainederror() creates a new overconstrainederror object. properties overconstrainederror.constraint read only returns the constraint that was supplied in the constructor, meaning the constraint that was not satisfied. overconstrainederror.message read only returns the text supplied in the constructor. overconstrainederror.name read only will always return overconstrainederror. methods no...
... that was supplied in the constructor, meaning the constraint that was not satisfied. overconstrainederror.message read only returns the text supplied in the constructor. overconstrainederror.name read only will always return overconstrainederror. methods none. specifications specification status comment media capture and streamsthe definition of 'overconstrainederror' in that specification. candidate recommendation initial definition. ...

PayerErrors - Web APIs
the payererrors dictionary is used by the payment request api to indicate the presence of—and to explain how to correct—validation errors in the payer details. for each field in the payment information that fails validation, the payererrors object contains a string explaining the error. the payer details include the payer's name, phone number, and email address. properties email optional if present, this domstring is a string describing the validation error from which the payer's email address—as given by paymentresponse.payeremail—currently suffers. if this property is absent from the payererrors object, the email address passed validation. name optional if this domstring is present in the object, the paymentresponse.payername property failed validation, and this string explai...
...sponse.payeremail—currently suffers. if this property is absent from the payererrors object, the email address passed validation. name optional if this domstring is present in the object, the paymentresponse.payername property failed validation, and this string explains what needs to be corrected. if this property is absent, the paer name is fine phone optional if present, this string is an error message explaining why the payer's phone number (paymentresponse.payerphone) failed validation. this property is absent if the phone number passed validation. example specifications specification status comment payment request apithe definition of 'payererrors' in that specification. candidate recommendation initial definition. ...

PaymentDetailsUpdate.shippingAddressErrors - Web APIs
the paymentdetailsupdate dictionary's shippingaddresserrors property, if present, contains an addresserrors object whose contents provide error messages for one or more of the values in the paymentaddress specified as paymentrequest.shippingaddress. syntax var addresserrors = paymentdetailsupdate.shippingaddresserrors; value an addresserrors object, which contains domstrings describing errors in the properties of a paymentaddress. for each property in paymentaddress, a property by the same name is found in shippingaddresserrors if and only if a validation error occurred for that property. in that case, the property in shippingaddresserrors is a string describing the validation error, ideally including suggestions about fixing the error. specifications specification ...
...ame name is found in shippingaddresserrors if and only if a validation error occurred for that property. in that case, the property in shippingaddresserrors is a string describing the validation error, ideally including suggestions about fixing the error. specifications specification status comment payment request apithe definition of 'paymentdetailsupdate.shippingaddresserrors' in that specification. candidate recommendation initial definition. ...

RTCIdentityErrorEvent.loginUrl - Web APIs
the read-only property rtcidentityerrorevent.loginurl is a domstring giving the url where the user can complete the authentication. it can be null and is provided by the identity provider (idp). firefox implements the interface of this property under the following name: rtcpeerconnectionidentityerrorevent. it is likely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. ...
... provider (idp). firefox implements the interface of this property under the following name: rtcpeerconnectionidentityerrorevent. it is likely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. ...

RTCIdentityErrorEvent.protocol - Web APIs
the read-only property rtcidentityerrorevent.protocol is a domstring describing the idp protocol in use. firefox implements the interface of this property under the following name: rtcpeerconnectionidentityerrorevent. it is likely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. ...
...domstring describing the idp protocol in use. firefox implements the interface of this property under the following name: rtcpeerconnectionidentityerrorevent. it is likely that it will correct this name when it will unprefix rtcpeerconnection, once spec and implementation will have been stabilized. ...

RTCPeerConnection: idpvalidationerror event - Web APIs
an idpvalidationerror event informs the target, a rtcpeerconnection object's onidpvalidationerror event handler, that the identity provider (idp) encountered an error while validating an identity assertion. an event handler for this event can be added using the rtcpeerconnection.onidpvalidationerror property. bubbles no cancelable no interface rtcidentityerrorevent event handler property onidpvalidationerror warning: this event is no longer used; instead, you can detect a validation error by detecting when the promise returned by rtcpeerconnection.peeridentity is rejected. ...
...tyerrorevent event handler property onidpvalidationerror warning: this event is no longer used; instead, you can detect a validation error by detecting when the promise returned by rtcpeerconnection.peeridentity is rejected. specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'idpvalidationerror' in that specification. candidate recommendation ...

RTCPeerConnection: idpvalidationerror event - Web APIs
an idpvalidationerror event informs the target, a rtcpeerconnection object, that the identity provider (idp) encountered an error when trying to validate an identity assertion. an event handler for this event can be added via the rtcpeerconnection.onidpvalidationerror property. bubbles no cancelable no interface rtcidentityerrorevent event handler property onidpvalidationerror important: this event is no longer used; it was removed from the specification long ago. instead, you should watch for the rtcpeerconnection.peeridentity promise to be rejected with an operationerror. ...
...er property onidpvalidationerror important: this event is no longer used; it was removed from the specification long ago. instead, you should watch for the rtcpeerconnection.peeridentity promise to be rejected with an operationerror. specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'idpvalidationerror' in that specification. candidate recommendation initial definition. ...

SpeechSynthesisErrorEvent - Web APIs
the speechsynthesiserrorevent interface of the web speech api contains information about any errors that occur while processing speechsynthesisutterance objects in the speech service. properties speechsynthesiserrorevent extends the speechsynthesisevent interface, which inherits properties from its parent interface, event. speechsynthesiserrorevent.error read only returns an error code indicating what has gone wrong with a speech synthesis attempt. methods speechsynthesiserrorevent extends the speechsynthesisevent interface, which inherits methods from its parent interface, event. examples var synth = window.speechsynthesis; var inputform = document.queryselector('form'); var inputtxt = document.queryselector('input'); var voiceselect = document.queryselector('select'); var voi...
...voices(); ... inputform.onsubmit = function(event) { event.preventdefault(); var utterthis = new speechsynthesisutterance(inputtxt.value); var selectedoption = voiceselect.selectedoptions[0].getattribute('data-name'); for(i = 0; i < voices.length ; i++) { if(voices[i].name === selectedoption) { utterthis.voice = voices[i]; } } synth.speak(utterthis); utterthis.onerror = function(event) { console.log('an error has occurred with the speech synthesis: ' + event.error); } inputtxt.blur(); } specifications specification status comment web speech apithe definition of 'speechsynthesiserrorevent' in that specification. draft ...

WritableStreamDefaultController.error() - Web APIs
the error() method of the writablestreamdefaultcontroller interface causes any future interactions with the associated stream to error. this method is rarely used, since usually it suffices to return a rejected promise from one of the underlying sink’s methods. however, it can be useful for suddenly shutting down a stream in response to an event outside the normal lifecycle of interactions with the underlying sink. syntax writablestreamdefaultcontroller.error(e); parameters e a domstring representing the error you want future interactions to fail with. return value undefined. exceptions typeerror the stream you are trying to error is not a writablestream. examples const writablestream = new writablestream({ start(controller) { // do stuff with controller // e...
...reamdefaultcontroller.error(e); parameters e a domstring representing the error you want future interactions to fail with. return value undefined. exceptions typeerror the stream you are trying to error is not a writablestream. examples const writablestream = new writablestream({ start(controller) { // do stuff with controller // error stream if necessary controller.error('my error is broken'); }, write(chunk, controller) { ... }, close(controller) { ... }, abort(err) { ... } }); specifications specification status comment streamsthe definition of 'error()' in that specification. living standard initial definition. ...

::grammar-error - CSS: Cascading Style Sheets
the ::grammar-error css pseudo-element represents a text segment which the user agent has flagged as grammatically incorrect. allowable properties only a small subset of css properties can be used in a rule with ::grammar-error in its selector: color background-color cursor caret-color outline and its longhands text-decoration and its associated properties text-emphasis-color text-shadow syntax ::grammar-error examples simple document grammar check in this example, eventual supporting browsers should highlight any flagged grammatical errors with the styles shown. ...
...ground-color cursor caret-color outline and its longhands text-decoration and its associated properties text-emphasis-color text-shadow syntax ::grammar-error examples simple document grammar check in this example, eventual supporting browsers should highlight any flagged grammatical errors with the styles shown. html <p>my friends is coming to the party tonight.</p> css ::grammar-error { text-decoration: underline red; color: red; } result specifications specification status comment css pseudo-elements level 4the definition of '::grammar-error' in that specification. working draft initial definition. ...

::spelling-error - CSS: Cascading Style Sheets
the ::spelling-error css pseudo-element represents a text segment which the user agent has flagged as incorrectly spelled. allowable properties only a small subset of css properties can be used in a rule with ::spelling-error in its selector: color background-color cursor caret-color outline and its longhands text-decoration and its associated properties text-emphasis-color text-shadow syntax ::spelling-error examples simple document spell check in this example, eventual supporting browsers should highlight any flagged spelling errors with the styles shown. ...
...nd its longhands text-decoration and its associated properties text-emphasis-color text-shadow syntax ::spelling-error examples simple document spell check in this example, eventual supporting browsers should highlight any flagged spelling errors with the styles shown. html <p contenteditable spellcheck="true">my friends are coegdfgfddffbgning to the party tonight.</p> css ::spelling-error { text-decoration: wavy red; } result specifications specification status comment css pseudo-elements level 4the definition of '::spelling-error' in that specification. working draft initial definition. ...

ReferenceError: can't access lexical declaration`X' before initialization - JavaScript
the javascript exception "can't access lexical declaration `variable' before initialization" occurs when a lexical variable was accessed before it was initialized. this happens within any block statement, when let or const declarations are accessed before they are defined. message referenceerror: use before delaration (edge) referenceerror: can't access lexical declaration `x' before initialization (firefox) referenceerror: 'x' is not defined (chrome) error type referenceerror what went wrong? a lexical variable was accessed before it was initialized. this happens within any block statement, when let or const declarations are accessed before they are defined. examples invalid cases in this case, the variable "foo" is redeclared in the block statement using let. function test() { l...
...eferenceerror what went wrong? a lexical variable was accessed before it was initialized. this happens within any block statement, when let or const declarations are accessed before they are defined. examples invalid cases in this case, the variable "foo" is redeclared in the block statement using let. function test() { let foo = 33; if (true) { let foo = (foo + 55); // referenceerror: can't access lexical // declaration `foo' before initialization } } test(); valid cases to change "foo" inside the if statement, you need to remove the let that causes the redeclaration. function test(){ let foo = 33; if (true) { foo = (foo + 55); } } test(); ...

TypeError: can't assign to property "x" on "y": not an object - JavaScript
the javascript strict mode exception "can't assign to property" occurs when attempting to create a property on primitive value such as a symbol, a string, a number or a boolean. primitive values cannot hold any property. message typeerror: can't assign to property "x" on {y}: not an object (firefox) typeerror: cannot create property 'x' on {y} (chrome) error type typeerror. what went wrong? in strict_mode, a typeerror is raised when attempting to create a property on primitive value such as a symbol, a string, a number or a boolean. primitive values cannot hold any property. the problem might be that an unexpected value is flowing at an unexpected place, or that an object variant of a string or a number is expected. examples invalid cases 'use strict'; var foo = "my string"; // the...
...n primitive value such as a symbol, a string, a number or a boolean. primitive values cannot hold any property. the problem might be that an unexpected value is flowing at an unexpected place, or that an object variant of a string or a number is expected. examples invalid cases 'use strict'; var foo = "my string"; // the following line does nothing if not in strict mode. foo.bar = {}; // typeerror: can't assign to property "bar" on "my string": not an object fixing the issue either fix the code to prevent the primitive from being used in such places, or fix the issue is to create the object equivalent object. 'use strict'; var foo = new string("my string"); foo.bar = {}; ...

SyntaxError: identifier starts immediately after numeric literal - JavaScript
the javascript exception "identifier starts immediately after numeric literal" occurs when an identifier started with a digit. identifiers can only start with a letter, underscore (_), or dollar sign ($). message syntaxerror: unexpected identifier after numeric literal (edge) syntaxerror: identifier starts immediately after numeric literal (firefox) syntaxerror: unexpected number (chrome) error type syntaxerror what went wrong? the names of variables, called identifiers, conform to certain rules, which your code must adhere to! a javascript identifier must start with a letter, underscore (_), or dollar sign ($). they can't start with a digit! only subsequent characters can be digits (0-9). examples variable names starting with numeric literals variable names can't start with numbers...
...identifiers, conform to certain rules, which your code must adhere to! a javascript identifier must start with a letter, underscore (_), or dollar sign ($). they can't start with a digit! only subsequent characters can be digits (0-9). examples variable names starting with numeric literals variable names can't start with numbers in javascript. the following fails: var 1life = 'foo'; // syntaxerror: identifier starts immediately after numeric literal var foo = 1life; // syntaxerror: identifier starts immediately after numeric literal alert(1.foo); // syntaxerror: identifier starts immediately after numeric literal you will need to rename your variable to avoid the leading number. var life1 = 'foo'; var foo = life1; ...

SyntaxError: for-in loop head declarations may not have initializers - JavaScript
the javascript strict mode-only exception "for-in loop head declarations may not have initializers" occurs when the head of a for...in contains an initializer expression, such as |for (var i = 0 in obj)|. this is not allowed in for-of loops in strict mode. message syntaxerror: for-in loop head declarations cannot have an initializer (edge) syntaxerror: for-in loop head declarations may not have initializers (firefox) syntaxerror: for-in loop variable declaration may not have an initializer. (chrome) error type syntaxerror in strict mode only. what went wrong? the head of a for...in loop contains an initializer expression. that is, a variable is declared and assigned a value |for (var i = 0 in obj)|. in non-strict mode, this head declaration is silently ignored and behaves like |for (var...
...riable declaration may not have an initializer. (chrome) error type syntaxerror in strict mode only. what went wrong? the head of a for...in loop contains an initializer expression. that is, a variable is declared and assigned a value |for (var i = 0 in obj)|. in non-strict mode, this head declaration is silently ignored and behaves like |for (var i in obj)|. in strict mode, however, a syntaxerror is thrown. examples this example throws a syntaxerror: "use strict"; var obj = {a: 1, b: 2, c: 3 }; for (var i = 0 in obj) { console.log(obj[i]); } // syntaxerror: for-in loop head declarations may not have initializers valid for-in loop you can remove the initializer (i = 0) in the head of the for-in loop. "use strict"; var obj = {a: 1, b: 2, c: 3 }; for (var i in obj) { console.

SyntaxError: a declaration in the head of a for-of loop can't have an initializer - JavaScript
the javascript exception "a declaration in the head of a for-of loop can't have an initializer" occurs when the head of a for...of loop contains an initializer expression such as |for (var i = 0 of iterable)|. this is not allowed in for-of loops. message syntaxerror: for-of loop head declarations cannot have an initializer (edge) syntaxerror: a declaration in the head of a for-of loop can't have an initializer (firefox) syntaxerror: for-of loop variable declaration may not have an initializer. (chrome) error type syntaxerror what went wrong? the head of a for...of loop contains an initializer expression. that is, a variable is declared and assigned a value |for (var i = 0 of iterable)|. this is not allowed in for-of loops. you might want a for loop that does allow an initializer. examp...
...maybe you intended to make 50 an offset value, in that case you could add it to the loop body, for example. ...

TypeError: "x" has no properties - JavaScript
the javascript exception "null (or undefined) has no properties" occurs when you attempt to access properties of null and undefined. they don't have any. message typeerror: unable to get property {x} of undefined or null reference (edge) typeerror: null has no properties (firefox) typeerror: undefined has no properties (firefox) error type typeerror. ...
...es of null and undefined. they don't have any. message typeerror: unable to get property {x} of undefined or null reference (edge) typeerror: null has no properties (firefox) typeerror: undefined has no properties (firefox) error type typeerror. what went wrong? both, null and undefined, have no properties you could access. examples null and undefined have no properties null.foo; // typeerror: null has no properties undefined.bar; // typeerror: undefined has no properties ...

ReferenceError: "x" is not defined - JavaScript
the javascript exception "variable is not defined" occurs when there is a non-existent variable referenced somewhere. message referenceerror: "x" is not defined error type referenceerror. what went wrong? there is a non-existent variable referenced somewhere. this variable needs to be declared, or you need to make sure it is available in your current script or scope. note: when loading a library (such as jquery), make sure it is loaded before you access library variables, such as "$". put the <script> tag that loads the library before your code that uses it. examples variable not declared foo.substring(1); // referenceerror: foo is not defined the "foo" variable isn't defined anywhere. it needs to be some string, so that the string.prototype.substring() method will work. var fo...
...ork. var foo = 'bar'; foo.substring(1); // "ar" wrong scope a variable needs to be available in the current context of execution. variables defined inside a function cannot be accessed from anywhere outside the function, because the variable is defined only in the scope of the function function numbers() { var num1 = 2, num2 = 3; return num1 + num2; } console.log(num1); // referenceerror num1 is not defined. however, a function can access all variables and functions defined inside the scope in which it is defined. in other words, a function defined in the global scope can access all variables defined in the global scope. var num1 = 2, num2 = 3; function numbers() { return num1 + num2; } console.log(numbers()); // 5 ...

SyntaxError: unterminated string literal - JavaScript
the javascript error "unterminated string literal" occurs when there is an unterminated string somewhere. string literals must be enclosed by single (') or double (") quotes. message syntaxerror: unterminated string constant (edge) syntaxerror: unterminated string literal (firefox) error type syntaxerror what went wrong? there is an unterminated string somewhere. string literals must be enclosed by single (') or double (") quotes. javascript makes no distinction between single-quoted strings and double-quoted strings. escape sequences work in strings created with either single or double quotes. to fix this error, check if: you have opening and closing quotes (single or double) for your string literal, you have escaped your string literal correctly, your string literal isn't split a...
...ur string literal, you have escaped your string literal correctly, your string literal isn't split across multiple lines. examples multiple lines you can't split a string across multiple lines like this in javascript: var longstring = 'this is a very long string which needs to wrap across multiple lines because otherwise my code is unreadable.'; // syntaxerror: unterminated string literal instead, use the + operator, a backslash, or template literals. the + operator variant looks like this: var longstring = 'this is a very long string which needs ' + 'to wrap across multiple lines because ' + 'otherwise my code is unreadable.'; or you can use the backslash character ("\") at the end of each line to indicate that th...

Error() constructor - JavaScript
the error constructor creates an error object. syntax new error([message[, filename[, linenumber]]]) parameters messageoptional a human-readable description of the error. filename optional the value for the filename property on the created error object. defaults to the name of the file containing the code that called the error() constructor. linenumber optional the value for the linenumber property on the created error object. defaults to the line number containing the error() constructor invocation. examples function call or new construction when error is used like a function -- without new, it will return an error object. therefore, a mere call to error will produce the same output that constructing an error object via the new keyword would. // this... ...
...e linenumber property on the created error object. defaults to the line number containing the error() constructor invocation. examples function call or new construction when error is used like a function -- without new, it will return an error object. therefore, a mere call to error will produce the same output that constructing an error object via the new keyword would. // this... const x = error('i was created using a function call!') ​​​​// ...has the same functionality as this. const y = new error('i was constructed via the "new" keyword!') specifications specification ecmascript (ecma-262)the definition of 'error constructor' in that specification. ...

Error.prototype.message - JavaScript
the message property is a human-readable description of the error. description this property contains a brief description of the error if one is available or has been set. spidermonkey makes extensive use of the message property for exceptions. the message property combined with the name property is used by the error.prototype.tostring() method to create a string representation of the error. by default, the message property is an empty string, but this behavior can be overridden for an instance by specifying a message as the first argument to the error constructor. ...
...se of the message property for exceptions. the message property combined with the name property is used by the error.prototype.tostring() method to create a string representation of the error. by default, the message property is an empty string, but this behavior can be overridden for an instance by specifying a message as the first argument to the error constructor. examples throwing a custom error var e = new error('could not parse input'); // e.message is 'could not parse input' throw e; specifications specification ecmascript (ecma-262)the definition of 'error.prototype.message' in that specification. ...

Error.prototype.toSource() - JavaScript
the tosource() method returns code that could eval to the same error. syntax e.tosource() return value a string containing the source code of the error. examples using tosource calling the tosource method of an error instance (including nativeerrors) will return a string containing the source code of the error. this string can be evaluated to create an (approximately) equal object. naturally, the string containing the source follows the structure of the error constructor. for example: (newname(message ,filename,linenumber)) where these attributes correspond to the respective properties of the error instance. note: be aware that the properties used by the tosource method in the creation of this string are mutable and may not accurately reflect the function used to create a...
...rally, the string containing the source follows the structure of the error constructor. for example: (newname(message ,filename,linenumber)) where these attributes correspond to the respective properties of the error instance. note: be aware that the properties used by the tosource method in the creation of this string are mutable and may not accurately reflect the function used to create an error instance or the filename or line number where the actual error occurred. specifications not part of any standard. ...

<merror> - MathML
the mathml <merror> element is used to display contents as error messages. in firefox this error message is rendered similar to the typical xml error message. note that this error is not thrown when your mathml markup is wrong or not well-formed xml. you will still get an xml parsing error (in case of the xhtml notation of mathml), which has nothing to do with <merror>. attributes class, id, style provided for use with stylesheets. href used to set a hyperlink to a specified uri. mathbackground the background color. you can use #rgb, #rrggbb and html color names. mathcolor the text color and also the fraction line color. you can use #rgb, #rrggbb and html color names. ...
...ml notation of mathml), which has nothing to do with <merror>. attributes class, id, style provided for use with stylesheets. href used to set a hyperlink to a specified uri. mathbackground the background color. you can use #rgb, #rrggbb and html color names. mathcolor the text color and also the fraction line color. you can use #rgb, #rrggbb and html color names. examples <math> <merror> <mrow> <mtext> division by zero: </mtext> <mfrac> <mn> 1 </mn> <mn> 0 </mn> </mfrac> </mrow> </merror> </math> specifications specification status comment mathml 3.0the definition of 'merror' in that specification. recommendation current specification mathml 2.0the definition of 'merror' in that specification. recommen...

Errors
this page lists the errors that can be raised due to firefox's anti-tracking functionality, governed by the storage access policy. you can find further information about them by clicking on the links below: a request to access cookies or storage was blocked because of a custom cookie permission blocked because it came from a tracker and content blocking is enabled blocked because we are blocking all storage access requests blocked because we are blocking all third-party storage access requests and content blocking is enabled granted partitioned access because it came from a third-party and dynamic first-party isolation is enabled ...

DownloadError
a downloaderror object provides detailed information about a download failure. properties attribute type description result read only nsresult the result code associated with this error. becausesourcefailed read only boolean indicates an error occurred while reading from the remote location. becausetargetfailed read only boolean indicates an error occurred while writing to the local target. inherits properties from error. ...

PRErrorCode
type for error codes that can be retrieved with pr_geterror. you can also set your own errors using pr_seterror. syntax #include <prerror.h> typedef print32 prerrorcode description the service nspr offers in this area is the ability to associate a thread-specific condition with an error number. the error number namespace is not well managed. nspr assumes error numbers starting at -6000 (decimal) and progressing towards zero. at present less than 100 error codes have been defined. if nspr's error handling is adopted by calling clients, then some sort of partitioning of the namespace will have to be employed. nspr does not attempt to address this issue. for nspr errors, see error codes. ...

PR_GetError
returns the current thread's last set platform-independent error code. syntax #include <prerror.h> prerrorcode pr_geterror(void) returns the value returned is a 32-bit number. nspr provides no direct interpretation of the number's value. nspr does use pr_seterror to set error numbers defined in error codes. ...

PR_GetErrorTextLength
gets the length of the error text. syntax #include <prerror.h> print32 pr_geterrortextlength(void) returns if a zero is returned, no error text is currently set. otherwise, the value returned is sufficient to contain the error text currently available. ...

PR_GetOSError
returns the current thread's last set os-specific error code. syntax #include <prerror.h> print32 pr_getoserror(void) returns the value returned is a 32-bit signed number. its interpretation is left to the caller. description used for platform-specific code that requires the underlying os error. for portability, clients should not create dependencies on the values of os-specific error codes. however, this information is preserved, along with a platform neutral error code, on a per thread basis. it is most useful during development. ...

nsIDOMFileError
obsolete since gecko 13.0 (firefox 13.0 / thunderbird 13.0 / seamonkey 2.10)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. the nsidomfileerror interface describes errors that occur while using the dom file api. it implements the dom fileerror object; for details, please read that article. ...

nsIDOMGeoPositionError
the nsidomgeopositionerror interface represents an error that occurred while performing geolocation operations. dom/interfaces/geolocation/nsidomgeopositionerror.idlscriptable please add a summary to this article. last changed in gecko 1.9.2 (firefox 3.6 / thunderbird 3.1 / fennec 1.0) inherits from: nsisupports attributes attribute type description code short numerical error code; see error constants for a complete list. read only. message domstring human readable error message. read only. gecko 1.9.2 note the message attribute was removed in gecko 1.9.2 (firefox 3.6). error constants constant value description permission_denied 1 the user denied permission to retrieve location data. pos...

nsIDOMGeoPositionErrorCallback
the nsidomgeopositionerrorcallback interface is used to represent an object that receives callback notifications when geolocation errors occur. dom/interfaces/geolocation/nsidomgeopositionerrorcallback.idlscriptable please add a summary to this article. last changed in gecko 1.9.1 (firefox 3.5 / thunderbird 3.0 / seamonkey 2.0) method overview void handleevent(in nsidomgeopositionerror position); methods handleevent() called to handle a geolocation error. void handleevent( in nsidomgeoposition position ); parameters position the error that occurred, as an nsidomgeopositionerror object. ...

AbstractWorker.onerror - Web APIs
the abstractworker.onerror property of the abstractworker interface represents an eventhandler, that is a function to be called when the error event occurs and bubbles through the worker. syntax myworker.onerror = function() { ... }; example the following code snippet shows creation of a worker object using the worker() constructor and setting up of an onerror handler on the resulting object: var myworker = new worker('worker.js'); myworker.onerror = function() { console.log('there is an error with your worker!'); } specifications specification status comment html living standardthe definition of 'abstractworker.onerror' in that specification. living standard ...

AddressErrors.city - Web APIs
an object based on addresserrors includes a city property when validation of the address fails for the value given for the address's city property. the returned string explains the error and should offer suggestions for how to correct it. syntax var cityerror = addresserrors.city; value if the value specified in the paymentaddress object's city property could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. if the city value was validated successfully, this property is not included in the addresserrors object. specifications specification status comment payment request apithe definition of 'addresserrors.city' in that specification. candidate recommendat...

AddressErrors.phone - Web APIs
an object based on addresserrors includes a phone property when the address's phone property couldn't be validated. the returned string explains the error and should offer suggestions for how to correct it. syntax var phoneerror = addresserrors.phone; value if the value specified in the paymentaddress object's phone property could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. if the phone value was validated successfully, this property is not included in the addresserrors object. specifications specification status comment payment request apithe definition of 'addresserrors.phone' in that specification. candidate recommendation initial definition. ...

AddressErrors.postalCode - Web APIs
an object based on addresserrors includes a postalcode property when the address's postalcode property couldn't be validated. the returned string explains the error and should offer suggestions for how to correct it. syntax var postcodeerror = addresserrors.postcode; value if the value specified in the paymentaddress object's postalcode property could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. if the postalcode value was validated successfully, this property is not included in the addresserrors object. specifications specification status comment payment request apithe definition of 'addresserrors.postalcode' in that specification. candidate recomme...

AddressErrors.recipient - Web APIs
an object based on addresserrors includes a recipient property when the address's recipient property couldn't be validated. the returned string explains the error and should offer suggestions for how to correct it. syntax var recipienterror = addresserrors.recipient; value if the value specified in the paymentaddress object's recipient property could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. if the recipient value was validated successfully, this property is not included in the addresserrors object. specifications specification status comment payment request apithe definition of 'addresserrors.recipient' in that specification. candidate recommenda...

AddressErrors.region - Web APIs
an object based on addresserrors includes a region property when the address's region property couldn't be validated. the returned string explains the error and should offer suggestions for how to correct it. syntax var regionerror = addresserrors.region; value if the value specified in the paymentaddress object's region property could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. if the region value was validated successfully, this property is not included in the addresserrors object. specifications specification status comment payment request apithe definition of 'addresserrors.region' in that specification. candidate recommendation initial defin...

AddressErrors.sortingCode - Web APIs
an object based on addresserrors includes a sortingcode property when the address's sortingcode property couldn't be validated. the returned string explains the error and should offer suggestions for how to correct it. syntax var sortingcodeerror = addresserrors.sortingcode; value if the value specified in the paymentaddress object's sortingcode property could not be validated, this property contains a domstring offering a human-readable explanation of the validation error and offers suggestions for correcting it. if the sortingcode value was validated successfully, this property is not included in the addresserrors object. specifications specification status comment payment request apithe definition of 'addresserrors.sortingcode' in that specification. candid...

AudioWorkletNode.onprocessorerror - Web APIs
the onprocessorerror property of the audioworkletnode interface defines an event handler function to be called when the processorerror event fires. this occurs when the underlying audioworkletprocessor behind the node throws an exception in its constructor, the process method, or any user-defined class method. once an exception is thrown, the processor (and thus the node) will output silence throughout its lifetime. syntax audioworkletnode.onprocessorerror = function() { ... }; examples // fill in example snippet specifications specification status comment web audio apithe definition of 'onprocessorerror' in that specification. working draft ...

BroadcastChannel.onmessageerror - Web APIs
the onmessageerror event handler of the broadcastchannel interface is an eventlistener, called whenever an messageevent of type messageerror is fired on the broadcastchannel instance — that is, when it receives a message that cannot be deserialized. note: this feature is available in web workers. syntax bc.onmessageerror = function() { ... }; specifications specification status comment html living standardthe definition of 'onmessageerror' in that specification. living standard ...

DedicatedWorkerGlobalScope.onmessageerror - Web APIs
the onmessageerror event handler of the dedicatedworkerglobalscope interface is an eventlistener, called whenever an messageevent of type messageerror is fired on the worker—that is, when it receives a message that cannot be deserialized. note: this feature is available in web workers. syntax onmessageerror = function() { ... }; specifications specification status comment html living standardthe definition of 'onmessageerror' in that specification. living standard ...

EventSource: error event - Web APIs
the error event of the eventsource api is fired when a connection with an event source fails to be opened. bubbles no cancelable no interface event or errorevent event handler property eventsource.onerror examples var evtsource = new eventsource('sse.php'); // addeventlistener version evtsource.addeventlistener('error', (e) => { console.log("an error occurred while attempting to connect."); }); // onerror version evtsource.onerror = (e) => { console.log("an error occurred while attempting to connect."); }; specifications specification status html living standardthe definition of 'error event' in that specification. living standard ...

EventSource.onerror - Web APIs
the onerror property of the eventsource interface is an eventhandler called when an error occurs and the error event is dispatched on an eventsource object. syntax eventsource.onerror = function examples evtsource.onerror = function() { console.log("eventsource failed."); }; note: you can find a full example on github — see simple sse demo using php. specifications specification status comment html living standardthe definition of 'onerror' in that specification. living standard initial definition ...

FileReader.error - Web APIs
the filereader error property returns the error that occurred while reading the file. syntax var error = instanceoffilereader.error value a domerror containing the relevant error. in chrome 48+/firefox 58+ this property returns a domexception because domerror has been removed from the dom standard. specifications specification status comment file apithe definition of 'filereader: error' in that specification. working draft initial definition ...

onerror - Web APIs
the filereader onerror handler receives an event object, not an error object, as a parameter, but an error can be accessed from the filereader object, as instanceoffilereader.error // callback from a <input type="file" onchange="onchange(event)"> function onchange(event) { var file = event.target.files[0]; var reader = new filereader(); reader.onerror = function(event) { alert("failed to read file!\n\n" + reader.error); reader.abort(); // (...does this do anything useful in an onerror handler?) }; reader.readastext(file); } ...

GeolocationPositionError.message - Web APIs
the geolocationpositionerror.message read-only property returns a human-readable domstring describing the details of the error. syntax let msg = geolocationpositionerrorinstance.message value a human-readable domstring describing the details of the error. specifications specification status comment geolocation apithe definition of 'geolocationpositionerror.message' in that specification. recommendation initial definition ...

HTMLMediaElement.onerror - Web APIs
the onerror property of the htmlmediaelement interface is the eventhandler for processing error events. the error event fires when some form of error occurs while attempting to load or perform the media. syntax htmlmediaelement.onerror = eventlistener; value a function which serves as the event handler for the error event. when an error occurs, the specified function will be called. if null, no error handler is in effect. specifications specification status comment html living standardthe definition of 'onerror' in that specification. living standard ...

FileHandle.onerror - 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 specifies an event listener to receive error events. these events occur when something goes wrong. syntax instanceoffilehandle.onerror = funcref; where funcref is a function to be called when the error event occurs. specifications specification status comment filesystem api editor's draft draft proposal. ...

LockedFile.onerror - 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 specifies an event listener to receive error events. these events occur when something goes wrong. syntax instanceoflockedfile.onerror = funcref; where funcref is a function to be called when the error event occurs. specifications specification status comment filesystem api editor's draft draft proposal. ...

MediaRecorderErrorEvent - Web APIs
the mediarecordererrorevent interface represents errors returned by the mediastream recording api. it is an event object that encapsulates a reference to a domexception describing the error that occurred. properties inherits properties from its parent interface, event. error read only a domexception containing information about the error that occurred. read only. constructor mediastreamrecorderevent() creates and returns a new mediarecordererrorevent event object with the given parameters. methods inherits methods from its parent interface, event. specifications specification status comment mediastream recordingthe definition of 'mediarecordererrorevent' in that specification. working draft initial definition. ...

MessagePort.onmessageerror - Web APIs
the onmessageerror event handler of the messageport interface is an eventlistener, called whenever an messageevent of type messageerror is fired on the port—that is, when it receives a message that cannot be deserialized. note: this feature is available in web workers. syntax port.onmessageerror = function() { ... }; specifications specification status comment html living standardthe definition of 'onmessageerror' in that specification. living standard ...

NDEFReader.onerror - Web APIs
the onerror property of ndefreader interface of the web nfc api is called whenever an error occurs during reading of nfc tags, e.g. when tags leave the reader's magnetic induction field. specifications specification status comment web nfc, ndefreader.onerror draft initial definition. ...

Notification.onerror - Web APIs
note: this feature is available in web workers. the onerror property of the notification interface specifies an event listener to receive error events. these events occur when something goes wrong with a notification (in many cases an error preventing the notification from being displayed.) syntax notification.onerror = function() { ... }; specifications specification status comment notifications apithe definition of 'onerror' in that specification. living standard initial specification. ...

OverconstrainedError.constraint - Web APIs
the constraint read-only property of the overconstrainederror interface returns the constraint that was supplied in the constructor, meaning the contraint that was not satisfied. syntax var constraint = overconstrainederror.constraint; value a string specifications specification status comment media capture and streamsthe definition of 'constraint' in that specification. candidate recommendation initial definition. ...

OverconstrainedError.message - Web APIs
the message read-only property of the overconstrainederror interface returns the text supplied in the constructor. syntax var message = overconstrainederror.message; value a domstring. specifications specification status comment media capture and streamsthe definition of 'message' in that specification. candidate recommendation initial definition. ...

OverconstrainedError.name - Web APIs
the name read-only property of the overconstrainederror interface will always return 'overconstrainederror'. syntax var name = overconstrainederror.name; value a domstring. specifications specification status comment media capture and streamsthe definition of 'name' in that specification. candidate recommendation initial definition. ...

RTCPeerConnection: idpassertionerror event - Web APIs
an idpassertionerror event informs the target, a rtcpeerconnection object, that the identity provider (idp) encountered an error when trying to generate an identity assertion. an event handler for this event can be added using the rtcpeerconnection.onidpassertionerror property. bubbles no cancelable no interface rtcidentityerrorevent event handler property onidpassertionerror warning: this event is no longer used; instead, you can detect an assertion error by detecting when the promise returned by rtcpeerconnection.peeridentity is rejected. specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'idpassertionerror' in that specification. candidate r...

Response.error() - Web APIs
the error() method of the response interface returns a new response object associated with a network error. note: this is mainly relevant to serviceworkers; the error method is used to return an error if you so wish it. an error response has its type set to error. note: an "error" response never really gets exposed to script: such a response to a fetch() would reject the promise. syntax var errorresponse = response.error(); parameters none. return value a response object. example tbd (does not yet appear to be supported anywhere). specifications specification status comment fetchthe definition of 'error()' in that specification. living standard ...

SVGElement: error event - Web APIs
the error event is fired when an svg element does not load properly or when an error occurs during script execution. this basically implements the standard error dom event. bubbles yes cancelable no interface svgevent event handler property onerror examples svgelem.addeventlistener('error', () => { console.log('svg not loaded properly.'); }) specifications specification status comment scalable vector graphics (svg) 2the definition of 'error' in that specification. candidate recommendation initial definition ...

SensorErrorEvent - Web APIs
the sensorerrorevent interface of the sensor apis provides information about errors thrown by a sensor or related interface. constructor sensorerrorevent.sensorerrorevent() creates a new sensorerrorevent object. properties sensorerrorevent.error read only returns the domexception object passed in the event's contructor. specifications specification status comment generic sensor apithe definition of 'sensorerrorevent' in that specification. candidate recommendation initial definition. ...

SpeechRecognition.onerror - Web APIs
the onerror property of the speechrecognition interface represents an event handler that will run when a speech recognition error occurs (when the error event fires.) syntax myspeechrecognition.onerror = function() { ... }; examples var recognition = new speechrecognition(); recognition.onerror = function(event) { console.log('speech recognition error detected: ' + event.error); } specifications specification status comment web speech apithe definition of 'onerror' in that specification. draft ...

SpeechRecognitionErrorEvent.message - Web APIs
the message read-only property of the speechrecognitionerrorevent interface returns a message describing the error in more detail. syntax var myerrormsg = event.message; value a domstring containing more details about the error that was raised. note that the spec does not define the exact wording of these messages — this is up to the implementors to decide upon. examples var recognition = new speechrecognition(); recognition.onerror = function(event) { console.log('speech recognition error detected: ' + event.error); console.log('additional information: ' + event.message); } specifications specification status comment web speech apithe definition of 'message' in that specification. draft ...

SpeechRecognitionErrorEvent - Web APIs
the speechrecognitionerrorevent interface of the web speech api represents error messages from the recognition service. properties speechrecognitionerrorevent also inherits properties from its parent interface, event. speechrecognitionerrorevent.error read only returns the type of error raised. speechrecognitionerrorevent.message read only returns a message describing the error in more detail. examples var recognition = new speechrecognition(); recognition.onerror = function(event) { console.log('speech recognition error detected: ' + event.error); console.log('additional information: ' + event.message); } specifications specification status comment web speech apithe definition of 'speechrecognitionerrorevent' in that specification. draft ...

WebSocket: error event - Web APIs
the error event is fired when a connection with a websocket has been closed due to an error (some data couldn't be sent for example). bubbles no cancelable no interface event event handler property onerror examples // create websocket connection const socket = new websocket('ws://localhost:8080'); // listen for possible errors socket.addeventlistener('error', function (event) { console.log('websocket error: ', event); }); specifications specification status html living standardthe definition of 'websocket error' in that specification. living standard ...

WebSocket.onerror - Web APIs
the websocket interface's onerror event handler property is a function which gets called when an error occurs on the websocket. you can also add an error event handler using addeventlistener(). syntax websocket.onerror = eventhandler; value a function or eventhandler which is executed whenever an error event occurs on the websocket connection. example websocket.onerror = function(event) { console.error("websocket error observed:", event); }; specifications specification status comment html living standardthe definition of 'websocket: onerror' in that specification. living standard initial definition ...

WindowEventHandlers.onmessageerror - Web APIs
the onmessageerror event handler of the windoweventhandlers interface is an eventlistener, called whenever an messageevent of type messageerror is fired on a window—that is, when it receives a message that cannot be deserialized. note: this feature is available in web workers. syntax window.onmessageerror = function() { ... }; specifications specification status comment html living standardthe definition of 'onmessageerror' in that specification. living standard ...

Worker.onmessageerror - Web APIs
the onmessageerror event handler of the worker interface is an eventlistener, called whenever an messageevent of type messageerror is fired on the worker instance — that is, when it receives a message that cannot be deserialized. note: this feature is available in web workers. syntax worker.onmessageerror = function() { ... }; specifications specification status comment html living standardthe definition of 'onmessageerror' in that specification. living standard ...

WorkerGlobalScope.onerror - Web APIs
the onerror property of the workerglobalscope interface represents an eventhandler to be called when the error event occurs and bubbles through the worker. syntax self.onerror = function() { ... }; example the following code snippet shows an onerror handler set inside a worker: self.onerror = function() { console.log('there is an error inside your worker!'); } specifications specification status comment html living standardthe definition of 'workerglobalscope.onerror' in that specification. living standard ...

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. ...

RangeError: radix must be an integer - JavaScript
the javascript exception "radix must be an integer at least 2 and no greater than 36" occurs when the optional radix parameter of the number.prototype.tostring() or the bigint.prototype.tostring() method was specified and is not between 2 and 36. message rangeerror: invalid argument (edge) rangeerror: radix must be an integer at least 2 and no greater than 36 (firefox) rangeerror: tostring() radix argument must be between 2 and 36 (chrome) error type rangeerror what went wrong? the optional radix parameter of the number.prototype.tostring() or the bigint.prototype.tostring() method was specified. its value must be an integer (a number) between 2 and 36, specifying the base of the number system to be used for representing numeric values. for example, the decimal (base 10) number 169 is r...

TypeError: X.prototype.y called on incompatible type - JavaScript
the javascript exception "called on incompatible target (or object)" occurs when a function (on a given object), is called with a this not corresponding to the type expected by the function. message typeerror: 'this' is not a set object (edge) typeerror: function.prototype.tostring called on incompatible object (firefox) typeerror: function.prototype.bind called on incompatible target (firefox) typeerror: method set.prototype.add called on incompatible receiver undefined (chrome) typeerror: bind must be called on a function (chrome) error type typeerror what went wrong? when this error is thrown, a function (on a given object), is called with a this not corresponding to the type expected by the function. this issue can arise when using the function.prototype.call() or function.prototyp...

TypeError: can't access dead object - JavaScript
the javascript exception "can't access dead object" occurs when firefox disallows add-ons to keep strong references to dom objects after their parent document has been destroyed to improve in memory usage and to prevent memory leaks. message typeerror: can't access dead object error type typeerror what went wrong? to improve in memory usage and to prevent memory leaks, firefox disallows add-ons to keep strong references to dom objects after their parent document has been destroyed. a dead object, is holding a strong (keep alive) reference to a dom element that persists even after it was destroyed in the dom. to avoid these issues, references to dom nodes in foreign document should instead be stored in an object which is specific to that document, and cleaned up when the document is unlo...

ReferenceError: invalid assignment left-hand side - JavaScript
the javascript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere. for example, a single "=" sign was used instead of "==" or "===". message referenceerror: invalid assignment left-hand side error type referenceerror. what went wrong? there was an unexpected assignment somewhere. this might be due to a mismatch of a assignment operator and a comparison operator, for example. while a single "=" sign assigns a value to a variable, the "==" or "===" operators compare a value. examples typical invalid assignments if (math.pi = 3 || math.pi = 4) { console.log('no way!'); } // referenceerror: invalid assignment left-hand side var str = 'hello, ' += 'is it me ' += 'you\'re looking for?'; // referenceerror: invalid assignment left-hand s...

RangeError: invalid date - JavaScript
the javascript exception "invalid date" occurs when a string leading to an invalid date has been provided to date or date.parse(). message rangeerror: invalid date (edge) rangeerror: invalid date (firefox) rangeerror: invalid time value (chrome) rangeerror: provided date is not in valid range (chrome) error type rangeerror what went wrong? a string leading to an invalid date has been provided to date or date.parse(). examples invalid cases unrecognizable strings or dates containing illegal element values in iso formatted strings usually return nan. however, depending on the implementation, non–conforming iso format strings, may also throw rangeerror: invalid date, like the following cases in firefox: new date('foo-bar 2014'); new date('2014-25-23').toisostring(); new date('foo-bar...

RangeError: repeat count must be non-negative - JavaScript
the javascript exception "repeat count must be non-negative" occurs when the string.prototype.repeat() method is used with a count argument that is a negative number. message rangeerror: argument out of range rangeerror: repeat count must be non-negative (firefox) rangeerror: invalid count value (chrome) error type rangeerror what went wrong? the string.prototype.repeat() method has been used. it has a count parameter indicating the number of times to repeat the string. it must be between 0 and less than positive infinity and cannot be a negative number. the range of allowed values can be described like this: [0, +∞). examples invalid cases 'abc'.repeat(-1); // rangeerror valid cases 'abc'.repeat(0); // '' 'abc'.repeat(1); // 'abc' 'abc'.repeat(2); // 'abcabc' 'abc'.rep...

Error: Permission denied to access property "x" - JavaScript
the javascript exception "permission denied to access property" occurs when there was an attempt to access an object for which you have no permission. message error: permission denied to access property "x" error type error. what went wrong? there was attempt to access an object for which you have no permission. this is likely an <iframe> element loaded from a different domain for which you violated the same-origin policy. examples no permission to access document <!doctype html> <html> <head> <iframe id="myframe" src="http://www1.w3c-test.org/common/blank.html"></iframe> <script> onload = function() { console.log(frames[0].document); // error: permission denied to access property "document" } </script> </head> <body></body> </html> ...

TypeError: Reduce of empty array with no initial value - JavaScript
the javascript exception "reduce of empty array with no initial value" occurs when a reduce function is used. message typeerror: reduce of empty array with no initial value error type typeerror what went wrong? in javascript, there are several reduce functions: array.prototype.reduce(), array.prototype.reduceright() and typedarray.prototype.reduce(), typedarray.prototype.reduceright()). these functions optionally take an initialvalue (which will be used as the first argument to the first call of the callback). however, if no initial value is provided, it will use the first element of the array or typedarray as the initial value. this error is raised when an empty array is provided because no initial value can be returned in that case. examples invalid cases this problem appear...

TypeError: invalid arguments - JavaScript
the javascript exception "invalid arguments" occurs when typed array constructors are provided with a wrong argument. message typeerror: invalid arguments (firefox) error type typeerror what went wrong? typed array constructors require either a length, another typed array, array-like objects, iterable objects or an arraybuffer object to create a new typed array. other constructor arguments will not create a valid typed array. examples no strings in typed arrays typed arrays, for example a uint8array, can't be constructed from a string. in fact, strings can't be in typed arrays at all. var ta = new uint8array("nope"); // typeerror: invalid arguments different ways to create a valid uint8array: // from a length var uint8 = new uint8array(2); uint8[0] = 42; console.log(uint8...

ReferenceError: reference to undefined property "x" - JavaScript
the javascript warning "reference to undefined property" occurs when a script attempted to access an object property which doesn't exist. message referenceerror: reference to undefined property "x" (firefox) error type (firefox only) referenceerror warning which is reported only if javascript.options.strict preference is set to true. what went wrong? the script attempted to access an object property which doesn't exist. there are two ways to access properties; see the property accessors reference page to learn more about them. examples invalid cases in this case, the property bar is an undefined property, so a referenceerror will occur. var foo = {}; foo.bar; // referenceerror: reference to undefined property "bar" valid cases to avoid the error, you need to either add a definiti...

TypeError: variable "x" redeclares argument - JavaScript
the javascript strict mode-only exception "variable redeclares argument" occurs when the same variable name occurs as a function parameter and is then redeclared using a var assignment in a function body again. message typeerror: variable "x" redeclares argument (firefox) error type typeerror warning in strict mode only. what went wrong? the same variable name occurs as a function parameter and is then redeclared using a var assignment in a function body again. this might be a naming conflict and thus javascript warns about it. this error occurs as a warning in strict mode code only. in non-strict code, the redeclaration is silently ignored. examples invalid cases in this case, the variable "arg" redeclares the argument. 'use strict'; function f(arg) { var arg = 'foo'; } valid...

Error.prototype.columnNumber - JavaScript
the columnnumber property contains the column number in the line of the file that raised this error. examples using columnnumber var e = new error('could not parse input'); throw e; console.log(e.columnnumber) // 0 specifications not part of any standard. ...

Error.prototype.fileName - JavaScript
the filename property contains the path to the file that raised this error. description this non-standard property contains the path to the file that raised this error. if called from a debugger context, the firefox developer tools for example, "debugger eval code" is returned. examples using filename var e = new error('could not parse input'); throw e; // e.filename could look like "file:///c:/example.html" specifications not part of any standard. ...

Error.prototype.lineNumber - JavaScript
the linenumber property contains the line number in the file that raised this error. examples using linenumber var e = new error('could not parse input'); throw e; console.log(e.linenumber) // 2 alternative example using error event window.addeventlistener('error', function(e) { console.log(e.linenumber); // 5 }); var e = new error('could not parse input'); throw e; this is not a standard feature and lacks widespread support. see the browser compatability table below. specifications not part of any standard. ...

Error.prototype.name - JavaScript
the name property represents a name for the type of error. the initial value is "error". description by default, error instances are given the name "error". the name property, in addition to the message property, is used by the error.prototype.tostring() method to create a string representation of the error. examples throwing a custom error var e = new error('malformed input'); // e.name is 'error' e.name = 'parseerror'; throw e; // e.tostring() would return 'parseerror: malformed input' specifications specification ecmascript (ecma-262)the definition of 'error.prototype.name' in that specification. ...

InternalError() constructor - JavaScript
the internalerror() constructor creates an error that indicates an error that occurred internally in the javascript engine. for example: "internalerror: too much recursion". syntax new internalerror([message[, filename[, linenumber]]]) parameters message optional. human-readable description of the error filename optional. the name of the file containing the code that caused the exception linenumber optional. the line number of the code that caused the exception examples creating a new internalerror new internalerror("engine failure"); specifications not part of any standard. ...

Index - Web APIs
22 abstractworker api, abstract, abstractworker, interface, reference, sharedworker, web workers, web workers api, worker the abstractworker interface of the web workers api is an abstract interface that defines properties and methods that are common to all types of worker, including not only the basic worker, but also serviceworker and sharedworker. 23 abstractworker.onerror api, abstractworker, eventhandler, property, reference, web workers, workers, onerror the abstractworker.onerror property of the abstractworker interface represents an eventhandler, that is a function to be called when the error event occurs and bubbles through the worker. 24 accelerometer api, accelerometer, accelerometer api, generic sensor api, interface, reference, se...
...teger containing the acceleration of the device along the its y axis. 28 accelerometer.z api, accelerometer, accelerometer api, generic sensor api, property, reference, sensor, sensor apis, sensors, z the z read-only property of the accelerometer interface returns a double precision integer containing the acceleration of the device along the its z axis. ...
...n of the device along the its y axis. 28 accelerometer.z api, accelerometer, accelerometer api, generic sensor api, property, reference, sensor, sensor apis, sensors, z the z read-only property of the accelerometer interface returns a double precision integer containing the acceleration of the device along the its z axis. ...
...And 209 more matches

sslerr.html
this page is part of the ssl reference that we are migrating into the format described in the mdn style guide. if you are inclined to help with this migration, your help would be very much appreciated. upgraded documentation may be found in the current nss reference nss and ssl error codes chapter 8 nss and ssl error codes nss error codes are retrieved using the nspr function pr_geterror. in addition to the error codes defined by nspr, pr_geterror retrieves the error codes described in this chapter. ssl error codes sec error codes ssl error codes table 8.1 error codes defined in sslerr.h constant value description ssl_error_export_only_server -12288 "unable to communicate securely. peer does not support high-grade encryption." ...
...fined in sslerr.h constant value description ssl_error_export_only_server -12288 "unable to communicate securely. peer does not support high-grade encryption." the local system was configured to support the cipher suites permitted for domestic use. the remote system was configured to support only the cipher suites permitted for export use. ssl_error_us_only_server -12287 "unable to communicate securely. peer requires high-grade encryption which is not supported." the remote system was configured to support the cipher suites permitted for domestic use. the local system was configured to support only the cipher suites permitted for export use. ...
... the cipher suites permitted for export use. ssl_error_us_only_server -12287 "unable to communicate securely. peer requires high-grade encryption which is not supported." the remote system was configured to support the cipher suites permitted for domestic use. the local system was configured to support only the cipher suites permitted for export use. ssl_error_no_cypher_overlap -12286 "cannot communicate securely with peer: no common encryption algorithm(s)." the local and remote systems share no cipher suites in common. this can be due to a misconfiguration at either end. ...
...And 145 more matches

HTTP Index - HTTP
sharing (cors) ajax, cors, cross-origin resource sharing, fetch, fetch api, http, http access controls, same-origin policy, security, xmlhttprequest, l10n:priority 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. 21 cors errors cors, errors, http, https, messages, same-origin, security, console, troubleshooting 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. 22 reason: cors disabled authentication, authentication article, cors, cross-origin, disabled, erro...
...rce, same origin, same-origin, security, sharing, validation, secure, troubleshooting a request that needs to use cors was attempted, but cors is disabled in the user's browser. when this happens, the user needs to turn cors back on in their browser. ...
...match 'xyz' cors, corsalloworiginnotmatchingorigin, cross-origin, error, http, https, messages, reasons, security, console, troubleshooting simply put, the origin making the request does not match any of the origins permitted by the access-control-allow-origin header. 24 reason: cors header 'access-control-allow-origin' missing cors, corsmissingalloworigin, cross-origin, error, http, https, messages, reasons, security, console, troubleshooting the response to the cors request is missing the required access-control-allow-origin header, which is used to determine whether or not the resource can be accessed by content operating within the current origin. 25 reason: cors header ‘origin’ cannot be added cors, corsoriginheadernotadded, cross-origin, ...
...And 58 more matches

Client-side form validation - Learn web development
lidation done in the browser is called client-side validation, while validation done on the server is called server-side validation. in this chapter we are focusing on client-side validation. if the information is correctly formatted, the application allows the data to be submitted to the server and (usually) saved in a database; if the information isn't correctly formatted, it gives the user an error message explaining what needs to be corrected, and lets them try again. we want to make filling out web forms as easy as possible. so why do we insist on validating our forms? there are three main reasons: we want to get the right data, in the right format. our applications won't work properly if our users' data is stored in the wrong format, is incorrect, or is omitted altogether. we want t...
...s, which lets you apply a specific style to valid elements. if the user tries to send the data, the browser will submit the form, provided there is nothing else stopping it from doing so (e.g., javascript). when an element is invalid, the following things are true: the element matches the :invalid css pseudo-class, and sometimes other ui pseudo-classes (e.g., :out-of-range) depending on the error, which lets you apply a specific style to invalid elements. if the user tries to send the data, the browser will block the form and display an error message. note: there are several errors that will prevent the form from being submitted, including a badinput, patternmismatch, rangeoverflow or rangeunderflow, stepmismatch, toolong or tooshort, typemismatch, valuemissing, or a customerror. bu...
... input:valid { border: 2px solid black; } to begin, make a copy of fruit-start.html in a new directory on your hard drive. the required attribute the simplest html5 validation feature is the required attribute. to make an input mandatory, add this attribute to the element. when this attribute is set, the element matches the :required ui pseudo-class and the form won't submit, displaying an error message on submission when the input is empty. while empty, the input will also be considered invalid, matching the :invalid ui pseudo-class. add a required attribute to your input, as shown below. <form> <label for="choose">would you prefer a banana or cherry? (required)</label> <input id="choose" name="i_like" required> <button>submit</button> </form> note the css that is included in t...
...And 43 more matches

WebIDL bindings
t refcounted then the return value of functions that return it should return an nsautoptr. c++ reflections of webidl constructs c++ reflections of webidl operations (methods) a webidl operation is turned into a method call on the underlying c++ object. the return type and argument types are determined as described below. in addition to those, all methods that are allowed to throw will get an errorresult& argument appended to their argument list. non-static methods that use certain webidl types like any or object will get a jscontext* argument prepended to the argument list. static methods will be passed a const globalobject& for the relevant global and can get a jscontext* by calling context() on it. the name of the c++ method is simply the name of the webidl operation with the first lett...
...r(any something); void doyetanotherthing(optional boolean actuallydoit = false); static void staticoperation(any arg); }; will require these method declarations: class myclass { void dosomething(int32_t anumber); double dosomething(myclass* aotherinstance); already_addrefed<myinterface> dosomethingelse(optional<int32_t> amaybenumber, errorresult& rv); void dosomethingelse(myclass& aotherinstance, errorresult& rv); void dotheother(jscontext* cx, js::value asomething); void doyetanotherthing(bool aactuallydoit); static void staticoperation(const globalobject& aglobal, js::value asomething); } c++ reflections of webidl attributes a webidl attribute is turned into a pair of method calls for the getter and setter on the un...
...ance of myinterface. constructors are always allowed to throw. ...
...And 40 more matches

sslfnc.html
cstatus nss_init(char *configdir); parameter this function has the following parameter: configdir a pointer to a string containing the pathname of the directory where the certificate, key, and security module databases reside. returns the function returns one of these values: if successful, secsuccess. if unsuccessful, secfailure. use pr_geterror to retrieve the error code. description nss_init opens the certn.db, keyn.db, and secmod.db files (wheren is a numeric digit) in the specified directory. nss_init isnot idempotent, so call it only once. nss_init opens the database files read-only. if you are performing operations that require write permission, for example s/mime operations such as adding a certificate, use nss_initreadw...
...ss_initreadwrite(char *configdir); parameter this function has the following parameter: configdir a pointer to a string containing the pathname of the directory where the certificate, key, and security module databases reside. returns the function returns one of these values: if successful, secsuccess. if unsuccessful, secfailure. use pr_geterror to retrieve the error code. description nss_initreadwrite opens the certn.db, keyn.db, and secmod.db files (wheren is a numeric digit) with both read and write permission in the specified directory. nss_initreadwrite isnot idempotent, so call it only once. use nss_initreadwrite rather than nss_init if you are performing operations that require write permission, such as some s/mime operat...
...ssl, which requires that the certificate and key database files be opened. syntax #include "nss.h" secstatus nss_nodb_init(char *reserved); parameter this function has the following parameter: reserved should be null.. returns the function returns one of these values: if successful, secsuccess. if unsuccessful, secfailure. use pr_geterror to retrieve the error code. description nss_nodb_init opens only the temporary database and the internal pkcs #112 module. unlike nss_init, nss_nodb_init allows applications that do not have access to storage for databases to run raw crypto, hashing, and certificate functions. nss_nodb_init isnot idempotent, so call it only once. before calling nss_nodb_init, your program must call pr...
...And 39 more matches

Using IndexedDB - Web APIs
base 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 indexeddb do the same thing - return an idbrequest object with the result or error. 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 th...
...ll be converted to the closest lower integer and the transaction may not start, nor the upgradeneeded event trigger. so for example, don't use 2.4 as a version number: var request = indexeddb.open("mytestdatabase", 2.4); // don't do this, as the version will be rounded to 2 generating handlers the first thing you'll want to do with almost all of the requests you generate is to add success and error handlers: request.onerror = function(event) { // do something with request.errorcode! }; request.onsuccess = function(event) { // do something with request.result! }; which of the two functions, onsuccess() or onerror(), gets called? if everything succeeds, a success event (that is, a dom event whose type property is set to "success") is fired with request as its target. once it is fired, t...
... { // do something with request.result! }; which of the two functions, onsuccess() or onerror(), gets called? if everything succeeds, a success event (that is, a dom event whose type property is set to "success") is fired with request as its target. once it is fired, the onsuccess() function on request is triggered with the success event as its argument. otherwise, if there was any problem, an error event (that is, a dom event whose type property is set to "error") is fired at request. this triggers the onerror() function with the error event as its argument. the indexeddb api is designed to minimize the need for error handling, so you're not likely to see many error events (at least, not once you're used to the api!). in the case of opening a database, however, there are some common condit...
...And 37 more matches

What went wrong? Troubleshooting JavaScript - Learn web development
previous overview: first steps next when you built up the "guess the number" game in the previous article, you may have found that it didn't work. never fear — this article aims to save you from tearing your hair out over such problems by providing you with some tips on how to find and fix errors in javascript programs. prerequisites: basic computer literacy, a basic understanding of html and css, an understanding of what javascript is. ...
...e aims to save you from tearing your hair out over such problems by providing you with some tips on how to find and fix errors in javascript programs. prerequisites: basic computer literacy, a basic understanding of html and css, an understanding of what javascript is. objective: to gain the ability and confidence to start fixing problems in your own code. types of error generally speaking, when you do something wrong in code, there are two main types of error that you'll come across: syntax errors: these are spelling errors in your code that actually cause the program not to run at all, or stop working part way through — you will usually be provided with some error messages too. these are usually okay to fix, as long as you are familiar with the right tool...
..., when you do something wrong in code, there are two main types of error that you'll come across: syntax errors: these are spelling errors in your code that actually cause the program not to run at all, or stop working part way through — you will usually be provided with some error messages too. these are usually okay to fix, as long as you are familiar with the right tools and know what the error messages mean! logic errors: these are errors where the syntax is actually correct but the code is not what you intended it to be, meaning that program runs successfully but gives incorrect results. these are often harder to fix than syntax errors, as there usually isn't an error message to direct you to the source of the error. okay, so it's not quite that simple — there are some other diff...
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How to check the security state of an XMLHTTPRequest over SSL - Web APIs
vailable 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. ...
...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). ...
...rt dialog to handle ssl exceptions in your firefox extension or xulrunner application. // adapted from the patch for moztcpsocket error reporting (bug 861196). ...
...And 35 more matches

Index
n. 34 js::compileoptions jsapi reference, reference, référence(2), spidermonkey some methods of js::owningcompileoptions and js::compileoptions return the instance itself to allow method chain. 35 js::construct jsapi reference, reference, référence(2), spidermonkey js::construct calls a specified function as a constructor, fun. 36 js::createerror jsapi reference, reference, référence(2), spidermonkey js::createerror creates an error object with specified properties. 37 js::currentglobalornull jsapi reference, reference, référence(2), spidermonkey js::currentglobalornull() returns the global object for whatever function is currently running on the context. in other words, it returns the global object on t...
...llocation fails when calling pod_{calloc,realloc}cangc, the js engine may call the large-allocation- failure callback, if set, to allow the embedding to flush caches, possibly perform shrinking gcs, etc. to make some room. the allocation will then be retried (and may still fail.) 68 js::setoutofmemorycallback jsapi reference, reference, référence(2), spidermonkey unlike the error reporter, which is only called if the exception for an oom bubbles up and is not caught, the js::outofmemorycallback is called immediately at the oom site to allow the embedding to capture the current state of heap allocation before anything is freed. if the large-allocation-failure callback is called at all (not all allocation sites call the large-allocation-failure callback on failure), it is c...
...kes the ownership of string and frees it in destructor. 87 jsautocompartment jsapi reference, spidermonkey no summary! 88 jsbool jsapi reference, obsolete, spidermonkey no summary! 89 jscheckaccessop jsapi reference, obsolete, reference, référence(2), spidermonkey check whether obj[id] may be accessed per mode, returning js_false on error/exception, js_true on success with obj[id]'s stored value in *vp. as for jspropertyop, id is either a string or an int jsval. 90 jsclass jsapi reference, spidermonkey use jsclass to define a custom class of javascript objects. a jsclass has a name, flags, and several callback functions for advanced customization of object behavior. 91 jsclass.call jsapi referen...
...And 29 more matches

OS.File for the main thread
note that this snippet is useful as a demonstration of complex asynchronous programming with os.file – in most cases, function os.file.writeatomic is a better ...
...note that this snippet is useful as a demonstration of complex asynchronous programming with os.file – in most cases, function os.file.writeatomic is a better choice. let writestream = function writestream(data, outfile, chunksize) { let view = new uint8array...
...ata| return promise.then(function onsuccess(bytes) { return loop(pos + bytes); // ... and loop. }); }; let promise = loop(0); // enter the loop. promise = promise.then(function onsuccess() { // once loop is complete, finalize. ...
...And 28 more matches

Bytecode Descriptions
) the typeof operator. infallible. the result is always a string that depends on the type of val. jsop::typeof and jsop::typeofexpr are the same except that--amazingly--jsop::typeof affects the behavior of an immediately preceding jsop::getname or jsop::getgname instruction! this is how we implement typeof step 2, making typeof nonexistingvariable return "undefined" instead of throwing a referenceerror. in a global scope: typeof x compiles to getgname "x"; typeof. typeof (0, x) compiles to getgname "x"; typeofexpr. emitting the same bytecode for these two expressions would be a bug. per spec, the latter throws a referenceerror if x doesn't exist. format: jof_ic pos stack: val ⇒ (+val) the unary + operator. +val doesn't do any actual math. it just calls tonumber(val). the conversion can c...
... ge stack: lval, rval ⇒ (lval op rval) relative operators (<, >, <=, >=). pop two values, compare them, and push the boolean result. the comparison may perform conversions that call .tostring()/.valueof() methods and can throw. implements: relational operators: evaluation. format: jof_ic instanceof stack: value, target ⇒ (value instanceof target) the instanceof operator. this throws a typeerror if target is not an object. it calls target[symbol.hasinstance](value) if the method exists. on success, the result is always a boolean value. format: jof_ic in stack: id, obj ⇒ (id in obj) the in operator. push true if obj has a property with the key id. otherwise push false. this throws a typeerror if obj is not an object. this can fire proxy hooks and can throw. on success, the result is ...
...n can call .tostring()/.valueof() methods and can throw. on success, the result is always numeric. format: jof_ic pow stack: lval, rval ⇒ (lval ** rval) the exponentiation operator (**). pop two values, convert them to numeric values, do exponentiation, and push the result. the top value is the exponent. the conversion can call .tostring()/.valueof() methods and can throw. this throws a rangeerror if both values are bigints and the exponent is negative. format: jof_ic conversions topropertykey stack: propertynamevalue ⇒ propertykey convert a value to a property key. implements: topropertykey, except that if the result would be the string representation of some integer in the range 0..2^31, we push the corresponding int32 value instead. this is because the spec insists that array ind...
...And 27 more matches

Index
firefox 3, including a description of the steps involved in modifying an existing c++ class to participate in xpcom cycle collection. if you have a class that you think is involved in a cyclical-ownership leak, this page is for you. 14 introduction to xpcom for the dom developing mozilla warning: this document has not yet been reviewed by the dom gurus, it might contain some errors. 15 language bindings embedding, landing, mozilla, xpcom, xpcom:language bindings an xpcom language binding is a bridge between a particular language and xpcom to provide access to xpcom objects from that language, and to let modules written in that language be used as xpcom objects by all other languages for which there are xpcom bindings. 16 components object ...
...es a javascript function which can be used to create or construct new instances of xpcom components. 18 components.exception xpcom:language bindings, xpconnect components.exception is a javascript constructor to create nsixpcexception objects. these exception objects may be thrown when implementing xpcom interfaces in javascript, and they can provide better diagnostics in the error console if not caught than simply throwing an nsresult's value will. 19 components.id xpcom:language bindings, xpconnect components.id is a constructor that creates native objects that conform to the nsijsid interface. 20 components.classes xpcom:language bindings, xpconnect components.classes is a read-only object whose properties are classes indexed by ...
... reflection of the global native component manager service. the scriptable methods on the nsicomponentmanager interface can be called directly on this object. 27 components.results xpcom:language bindings, xpconnect components.results is a read-only object whose properties are the names listed as the first parameters of the macros in js/xpconnect/src/xpc.msg (also at table of errors), with the value of each corresponding to that constant's value. 28 components.returncode xpcom:language bindings, xpconnect no summary! 29 components.stack xpcom:language bindings, xpconnect components.stack is a read only property of type nsistackframe (idl definition) that represents a snapshot of the current javascript callstack. this can be used for...
...And 26 more matches

MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
all.js because it is reserved. ref: bug 690370 available functions are (see prefcalls.js file for details): function getprefbranch() function pref(prefname, value) function defaultpref(prefname, value) function lockpref(prefname, value) function unlockpref(prefname) function getpref(prefname) function getldapattributes(host, base, filter, attribs) function getldapvalue(str, key) function displayerror(funcname, message) function getenv(name) configure autoconfig two directives ask thunderbird to use autoconfig at startup: # cat /usr/lib/thunderbird/defaults/pref/tb-autoconf.js // 20100526 - modification autoconfig jehan. // pref("general.config.obscure_value", 0); // for mcd .cfg files pref('general.config.filename', 'thunderbird.cfg'); // for mcd .cfg files it used to be in previous ...
...pvalue(values, "cn"); var mail = getldapvalue(values, "mail"); var url = getldapvalue(values, "labeleduri"); // those ldap variables are only available in this processldapvalues context! // so we set the preferences that need them here. lockpref("mail.identity.id1.useremail", mail); lockpref("mail.server.server2.name", mail); lockpref("mail.identity.id1.fullname", cn); //debug with popup error messages doesn't work anymore :-( !! var env_mozdebug= getenv("mozilla_debug"); if (env_mozdebug) {displayerror("no error, just a debug, cn =" + cn + " and mail = " + mail); } } } // 4) call ldap servers to get ldap attributes (mail & cn), this will finally call processldapvalues, "3)" just above. getldapattributes("ldap2.int-evry.fr","ou=people,dc=int-evry,dc=fr","uid=" + env_user,"uid,c...
...here's my own version. //note: for accessing the active directory of windows server later than 2000 //it is necessary to allow anonymous read access. ...
...And 24 more matches

Examples
how to throw reject if you have a function that is a promise, and want to end it and throw a reject, you can throw an error. components.utils.import("resource://gre/modules/osfile.jsm") let path = os.path.join(os.constants.path.tmpdir, "file.txt"); let promise = os.file.exists(path); let newpromise = promise.then(function onfulfill(aexists) { if (aexists) { console.log("you have file.txt in your temporary directory."); } else { throw new error("you don't have file.txt in your temporary directory."); } }); // unexpected errors should always be reported at the end of a promise chain. let lastpromise = newpromise.then(function onfulfill(){ }) .catch(function onreject(arejectreason) { console.warn('newpromise failed with reason: ', arejectreason); }); using a prom...
...when the callback finishes execution, newpromise will be fulfilled with an undefined fulfillment value, because the callback does not return any value. when newpromise is fulfilled,...
...s.file.exists(path); let newpromise = promise.then(function onfulfill(aexists) { if (aexists) { console.log("you have file.txt in your temporary directory."); } else { console.log("you don't have file.txt in your temporary directory."); } }); // unexpected errors should always be reported at the end of a promise chain. let lastpromise = newpromise.then(null, components.utils.reporterror); in this case, if the file existence check succeeds, the onfulfill callback is invoked. when the callback finishes execution, newpromise will be fulfilled with an undefined fulfillment value, because the callback does not return any value. when newpromise is fulfilled, nothing happens, because no fulfillment callback is specified and the return value of the last then method is ignored. if the...
...And 24 more matches

NSS_3.12_release_notes.html
kcs11t.h for details): ckk: keys ckk_camellia ckm: mechanisms ckm_sha224_rsa_pkcs ckm_sha224_rsa_pkcs_pss ckm_sha224 ckm_sha224_hmac ckm_sha224_hmac_general ckm_sha224_key_derivation ckm_camellia_key_gen ckm_camellia_ecb ckm_camellia_cbc ckm_camellia_mac ckm_camellia_mac_general ckm_camellia_cbc_pad ckm_camellia_ecb_encrypt_data ckm_camellia_cbc_encrypt_data ckg: mfgs ckg_mgf1_sha224 new error codes (see secerr.h): sec_error_not_initialized sec_error_token_not_logged_in sec_error_ocsp_responder_cert_invalid sec_error_ocsp_bad_signature sec_error_out_of_search_limits sec_error_invalid_policy_mapping sec_error_policy_validation_failed sec_error_unknown_aia_location_type sec_error_bad_http_response sec_error_bad_ldap_response sec_error_failed_to_encode_data sec_error_bad_info_access_loca...
...ee secerr.h): sec_error_not_initialized sec_error_token_not_logged_in sec_error_ocsp_responder_cert_invalid sec_error_ocsp_bad_signature sec_error_out_of_search_limits sec_error_invalid_policy_mapping sec_error_policy_validation_failed sec_error_unknown_aia_location_type sec_error_bad_http_response sec_error_bad_ldap_response sec_error_failed_to_encode_data sec_error_bad_info_access_location sec_error_libpkix_internal new mechanism flags (see secmod.h) public_mech_aes_flag public_mech_sha256_flag public_mech_sha512_flag public_mech_camellia_flag new oids (see secoidt.h) new ec signature oids sec_oid_ansix962_ecdsa_signature_recommended_digest sec_oid_ansix962_ecdsa_signature_specified_digest sec_oid_ansix962_ecdsa_sha224_signature sec_oid_ansix962_ecdsa_sha256_signature sec_oid_ansix962...
...sa_signature changed oids (see secoidt.h) sec_oid_pkcs12_key_usage changed to sec_oid_bogus_key_usage sec_oid_ansix962_ecdsa_signature_with_sha1_digest changed to sec_oid_ansix962_ecdsa_sha1_signature note: sec_oid_ansix962_ecdsa_signature_with_sha1_digest is also kept for compatibility reasons. ...
...And 22 more matches

Using Promises - JavaScript
ned promises before explaining how to create them. essentially, a promise is a returned object to which you attach callbacks, instead of passing callbacks into a function. ...
... function, createaudiofileasync(), which asynchronously generates a sound file given a configuration record and two callback functions, one called if the audio file is successfully created, and the other called if an error occurs. ...
...diofileasync(), which asynchronously generates a sound file given a configuration record and two callback functions, one called if the audio file is successfully created, and the other called if an error occurs. ...
...And 21 more matches

Install script template - Archive of obsolete content
suffix = "my"; var suffix_description = "my plugin files"; var company_name = "mypluginco"; var plugin_description = "my exemplary plugin mine all mine"; // registry constant paths // these will be used when the win32 registry keys are written var hkey_local_machine = "hkey_local_machine"; var hkey_current_user = "hkey_current_user"; var reg_moz_path = "software\\mozillaplugins"; // my own error code in case secondary installation fails var nosecondaryinstall = 1; // error return codes need some memory var err; // error return codes when we try and install to the current browser var errblock1; // error return codes when we try and do a secondary installation var errblock2 = 0; // global variable containing our secondary install location var secondaryfolder; //special error value...
...emory var err; // error return codes when we try and install to the current browser var errblock1; // error return codes when we try and do a secondary installation var errblock2 = 0; // global variable containing our secondary install location var secondaryfolder; //special error values used by the cycore developers (www.cycore.com) who helped make this install script var exceptionoccurederror = -4711; var winregisnullerror = -4712; var invalidrootkeyerror = -4713; var registrykeynotwritableerror = -4714; //initinstall block //the installation is initialized here -- if we fail here, cancel the installation // initinstall is quite an overloaded method, but i have invoked it here with three strings // which are globally defined err = initinstall(software_name,...
...); if (err != 0) { // call initinstall again in case illegal characters in plid err = initinstall(software_name, software_name, version); if (err != 0) cancelinstall(err); } //addfiles to current browser block var pluginsfolder = getfolder("plugins"); //verify disk space if(verifydiskspace(pluginsfolder, plugin_size+component_size)) { // start installing plugin shared library reseterror(); // install the plugin shared library to the current browser's plugin directory errblock1 = addfile (plid, version, plugin_file, pluginsfolder, null); if (errblock1!=0) { logcomment("could not add " + plugin_file + " to " + pluginsfolder + ":" + errblock1); cancelinstall(errblock1); } // start installing xpt file if this is a scriptable plugin // install to the plugins directory...
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Graceful asynchronous programming with Promises - Learn web development
ed, sets up a video element to show the stream coming from the camera as a "self view," then takes each of the stream's tracks and adds them to the webrtc rtcpeerconnection representing a connection to another user. after that, the status display is updated to say "connected". if getusermedia() fails, the catch block runs. this uses setstatusmessage() to update the status box to indicate that an error occurred. the important thing here is that the getusermedia() call returns almost immediately, even if the camera stream hasn't been obtained yet. even if the handlecallbutton() function has already returned to the code that called it, when getusermedia() has finished working, it calls the handler you provide. as long as the app doesn't assume that streaming has begun, it can just keep on runnin...
...we're able to chain multiple asynchronous actions to occur one after another this way because each .then() block returns a new promise that resolves when the .then() block is done ru...
...s response to ensure that the response body is fully downloaded, and when it is available transform it into a blob object that we can do something with. the result of this is returned like so: response => response.blob() which is shorthand for function(response) { return response.blob(); } unfortunately, we need to do slightly more than this. fetch promises do not fail on 404 or 500 errors — only on something catasrophic like a network failure. instead, they succeed, but with the response.ok property set to false. to produce an error on a 404, for example, we need to check the value of response.ok, and if false, throw an error, only returning the blob if it is true. this can be done like so — add the following lines below your first line of javascript. let promise2 = promis...
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JSAPI User Guide
mere nicety if the process is about to exit anyway. but as that is not always the case, calling js_shutdown is a good habit to get into.) the context: use js_newcontext and js_destroycontext. for maximum ecmascript standard compliance, applications should also use js_setoptions to enable jsoption_varobjfix. to get the latest javascript language features, applications may use js_setversion. error reporting is also per-context and is enabled using js_seterrorreporter. the global object: to create this object, you first need a jsclass with the jsclass_global_flags option. the example below defines a very basic jsclass (named global_class) with no methods or properties of its own. use js_newglobalobject to create a global object. use js_initstandardclasses to populate it with the stand...
...cribed above. #include "jsapi.h" using namespace js; // the class of the global object. static jsclass globalclass = { "global", jsclass_global_flags, js_propertystub, js_deletepropertystub, js_propertystub, js_strictpropertystub, js_enumeratestub, js_resolvestub, js_convertstub, nullptr, nullptr, nullptr, nullptr, js_globalobjecttracehook }; // the error reporter callback. void reporterror(jscontext *cx, const char *message, jserrorreport *report) { fprintf(stderr, "%s:%u:%s\n", report->filename ? report->filename : "[no filename]", (unsigned int) report->lineno, message); } int run(jscontext *cx) { // enter a request before running anything in the context. jsautorequest ar(cx); // create ...
... // own custom js objects and run scripts. return 0; } int main(int argc, const char *argv[]) { // initialize the js engine. if (!js_init()) return 1; // create a js runtime. jsruntime *rt = js_newruntime(8l * 1024l * 1024l); if (!rt) return 1; // create a context. jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; js_seterrorreporter(rt, reporterror); int status = run(cx); // shut everything down. js_destroycontext(cx); js_destroyruntime(rt); js_shutdown(); return status; } each jsnative has the same signature, regardless of what arguments it expects to receive from javascript. the javascript arguments to the function are given in argc and vp. argc tells how many actual arguments the call...
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Web Console remoting - Firefox Developer Tools
nt 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 be: page errors, window.console api messages, network activity, and file activity. for example: ["pageerror", "consoleapi", "networkactivity", "fileactivity"] the web console actor does not start any listeners by default. the client has the option to start each listener when needed. this approach allows for lower resource usage on the server - this is a potential issue if the server runs on devices with fewe...
...: "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. ...
... "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. ...
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Using Web Workers - Web APIs
using web workers. web workers api a worker is an object created using a constructor (e.g. worker()) that runs a named javascript file — this file contains the code that will run in the worker thread; workers run in another global context that is different from the current window. thus, using the window shortcut to get the current global scope (instead of self) within a worker will return an error. the worker context is represented by a dedicatedworkerglobalscope object in the case of dedicated workers (standard workers that are utilized by a single script; shared workers use sharedworkerglobalscope). a dedicated worker is only accessible from the script that first spawned it, whereas shared workers can be accessed from multiple scripts. note: see the web workers api landing page for re...
...you to enter two numbers to be multiplied together. the numbers are sent to a dedicated worker, multiplied together, and the result is returned to the page and displayed. this example is rather trivial, but we decided to keep it simple while introducing you to basic worker concepts. more advanced details are covered later on in the article. worker feature detection for slightly more controlled error handling and backwards compatibility, it is a good idea to wrap your worker accessing code in the following (main.js): if (window.worker) { ... } spawning a dedicated worker creating a new worker is simple. all you need to do is call the worker() constructor, specifying the uri of a script to execute in the worker thread (main.js): var myworker = new worker('worker.js'); sending messa...
...n thread and worker, it is copied or "transferred" (moved), not shared. read transferring data to and from workers: further details for a much more thorough explanation. terminating a worker if you need to immediately terminate a running worker from the main thread, you can do so by calling the worker's terminate method: myworker.terminate(); the worker thread is killed immediately. ...
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TypeScript support in Svelte - Learn web development
typescript: optional static typing for javascript typescript is a superset of javascript that provides features such as optional static typing, classes, interfaces, and generics. the goal of typescript is to help catch mistakes early through its type system and make javascript development more efficient. one of the big benefits is enabling ides to provide a richer environment for spotting common errors as you type the code. best of all, javascript code is valid typescript code; typescript is a superset of javascript. you can rename most of your .js files to .ts files and they will just work. our typescript code will be able to run everywhere javascript can run. how is that possible? typescript "transpiles" our code to vainilla javascript. that means that it parses typescript code and produce...
...verse report we can see that typescript is the 7th most used and 5th fastest growing language used on github. according to stackoverflow's 2019 developer survey it is the third most loved language, right behind rust and python. so typescript is going through a great phase of adoption. typescript's main advantages are: early spotted bugs: the compiler checks types at compile time and provides error reporting. readability: static typing gives the code more structure, making it self-documenting and more readable. rich ide support: type information allows code editors and ides to offer features like code navigation, autocompletion, and smarter hints. safer refactoring: types allows ides to know more about your code, and assist you while refactoring large portions of your code base. type in...
... developer experience with typescript typescript provides code editors and ides with lots of information to allow them to deliver a friendlier development experience. we'll use visual studio code to do a quick test and see how we can get autocompletion hints and type-checking as we're writing components. note: if you don't wish to use vs code, we also provide instructions for using typescript error checking from the terminal instead, slightly later on. there is work in progress to support typescript in svelte projects in several code editors; the most complete support so far is available in the svelte for vs code extension, which is developed and maintained by the svelte team. this extension offers type checking, inspecting, refactoring, intellisense, hover-information, auto-completion, a...
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nsIDOMWindowUtils
void stoppccountprofiling(); void suppresseventhandling(in boolean asuppress); void suspendtimeouts(); nsidomfile wrapdomfile(nsifile afile); attributes attribute type description currentinnerwindowid unsigned long long the id of the window's current inner window. read only. exceptions thrown ns_error_not_available there is no current inner window displaydpi float the dpi of the display. read only. doccharsetisforced boolean whether the charset of the window's current document has been forced by the user. cannot be accessed from unprivileged context (not content-accessible) read only. elementsrestyled read only unsigned long long th...
...(not content-accessible) read only. elementsrestyled read only unsigned long long the number of elements which have been restyled for the current document. keep in mind that during a restyle operation, an element may be restyled multiple times (for example, when an inline element contains blocks). this number also counts restyling of pseudo-elements and anonymous boxes. throws ns_error_not_available if the count can't be provided. focusedinputtype string the type of the currently-focused html <input> element, if one is focused. imageanimationmode unsigned short returns the image animation mode of the window. the attribute's value must be one of the animationmode values from imgicontainer. imeisopen boolean returns the ime open state...
... ime status. values correspond to the ime_status_* constants defined below. read only. ismozafterpaintpending boolean returns true if a mozafterpaint event has been queued but not yet fired. read only. layermanagertype astring what type of layer manager the widget associated with this window is using. "basic" is unaccelerated; other types are accelerated. throws an error if there is no widget associated with this window. read only. outerwindowid unsigned long long the id of the window's outer window. read only. paintingsuppressed boolean true if painting is currently suppressed for this window; otherwise false. read only. this is used on mobile, for example, to prevent attempts to render content until enough of the page ...
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Using Fetch - Web APIs
previously achieved using xmlhttprequest. 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. 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. instead, it will resolve normally (with ok status set to false), and it will only reject on network failure or if anything prevented the request from completing. fetch() won't can receive cross-site cookies; you can’t can establish a cross site session using fetch. set-cookie headers from other sites are silently ignored. fetch won’t send c...
...t', // *get, post, put, delete, etc. ...
...://example.com', { credentials: 'omit' }) uploading json data use fetch() to post json-encoded data. const data = { username: 'example' }; fetch('https://example.com/profile', { method: 'post', // or 'put' headers: { 'content-type': 'application/json', }, body: json.stringify(data), }) .then(response => response.json()) .then(data => { console.log('success:', data); }) .catch((error) => { console.error('error:', error); }); uploading a file files can be uploaded using an html <input type="file" /> input element, formdata() and fetch(). const formdata = new formdata(); const filefield = document.queryselector('input[type="file"]'); formdata.append('username', 'abc123'); formdata.append('avatar', filefield.files[0]); fetch('https://example.com/profile/avatar', { meth...
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Strict mode - JavaScript
trict mode will run strict mode code with different behavior from browsers that do, so don't rely on strict mode without feature-testing for support for the relevant aspects of strict mode. strict mode code and non-strict mode code can coexist, so scripts can opt into strict mode incrementally. strict mode makes several changes to normal javascript semantics: eliminates some javascript silent errors by changing them to throw errors. fixes mistakes that make it difficult for javascript engines to perform optimizations: strict mode code can sometimes be made to run faster than identical code that's not strict mode. prohibits some syntax likely to be defined in future versions of ecmascript. see transitioning to strict mode, if you want to change your code to work in the restricted variant...
...to enter strict mode. the entire contents of javascript modules are automatically in strict mode, with no statement needed to initiate it. function strict() { // because this is a module, i'm strict by default } export default strict; changes in strict mode strict mode changes both syntax and runtime behavior. changes generally fall into these categories: changes converting mistakes into errors (as syntax errors or at runtime), changes simplifying how the particular variable for a given use of a name is computed, changes simplifying eval and arguments, changes making it easier to write "secure" javascript, and changes anticipating future ecmascript evolution. converting mistakes into errors strict mode changes some previously-accepted mistakes into errors. javascript was designed to ...
...le for a given use of a name is computed, changes simplifying eval and arguments, changes making it easier to write "secure" javascript, and changes anticipating future ecmascript evolution. converting mistakes into errors strict mode changes some previously-accepted mistakes into errors. javascript was designed to be easy for novice developers, and sometimes it gives operations which should be errors non-error semantics. sometimes this fixes the immediate problem, but sometimes this creates worse problems in the future. strict mode treats these mistakes as errors so that they're discovered and promptly fixed. first, strict mode makes it impossible to accidentally create global variables. in normal javascript mistyping a variable in an assignment creates a new property on the global object a...
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Index - Archive of obsolete content
ng older hardware, for example, and can't upgrade to the latest and greatest browsers. or for "reasons," your company is required to use very old software and you need to build web content that runs on that software. or perhaps you're just curious about the history of an obsolete feature or api, and how it worked. 2 .htaccess ( hypertext access ) 301 redirect, cache control, custom error pages, htaccess, permanent redirect, redirect file accessing : htaccess files can be opened using any text editor, like windows notepad, vin, sublime text editor or any other. syntax highliting support for .htaccess files less. 3 2015 mdn fellowship program 2015, archive, fellowship no summary! 4 api api, archive archived documentation about obsolet...
... cfx add-on sdk, cfx enables you to test, run, and package add-ons. cfx is is no longer supported as of firefox 44 and no longer accepted for add-on submission, jpm should now be used instead. 135 cfx to jpm cfx, jpm, sdk, add-on a guide to working with jpm if you're already familiar with cfx. 136 console add-on sdk enables your add-on to log error, warning or informational messages. 137 jpm add-on sdk, jpm jpm is a command-line tool that enables you to test, run, and package add-ons. 138 jpm-mobile adb, add-ons, jpm, mobile, testing, travis-ci the node-based replacement for cfx --force-mobile. enables you to run and test add-ons for firefox mobile (aka fennec). 139 jpmignore jpm ...
...gsession->makewindoweditable(domwindow, editortype, pr_true). the first parameter is the nsidomwindow you just retrieved, the second is the editor type you want to create, and the third is whether you want the window editable immediately or when the document is done loading. ...
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sample2
/* this source code form is subject to the terms of the mozilla public * license, v. 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/. ...
...ficate for signature verification-----" #define ns_cert_vfy_trailer "-----end certificate for signature verification-----" #define ns_sig_header "-----begin signature-----" #define ns_sig_trailer "-----end signature-----" #define ns_cert_header "-----begin certificate-----" #define ns_cert_trailer "-----end certificate-----" /* missing publically from nss versions earlier than 3.13 */ #ifndef sec_error_base #define sec_error_base (-0x2000) typedef enum { sec_error_io = sec_error_base + 0, sec_error_token_not_logged_in = (sec_error_base + 155), sec_error_end_of_list } secerrorcodes; #endif /* port_errortostring introduced in nss 3.13. on earlier versions of nss that * don't support error tables, pr_errortostring will return "unknown code". */ #ifndef port_errortostring #define port_errortostring...
...fine sec_error_base (-0x2000) typedef enum { sec_error_io = sec_error_base + 0, sec_error_token_not_logged_in = (sec_error_base + 155), sec_error_end_of_list } secerrorcodes; #endif /* port_errortostring introduced in nss 3.13. on earlier versions of nss that * don't support error tables, pr_errortostring will return "unknown code". ...
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JSAPI Cookbook
(if your constructor doesn't take any arguments, you can skip the second step and call js_new(cx, constructor, 0, null) in step 3.) /* jsapi */ /* step 1 - get the value of |person| and check that it is an object. */ js::rootedvalue constructor_val(cx); if (!js_getproperty(cx, js_getglobalobject(cx), "person", &constructor_val)) return false; if (!constructor_val.isobject()) { js_reporterror(cx, "person is not a constructor"); return false; } js::rootedobject constructor(cx, &constructor_val.toobject()); /* step 2 - set up the arguments. */ js::rootedstring name_str(cx, js_newstringcopyz(cx, "dave")); if (!name_str) return false; js::autovaluearray<2> args(cx); args[0].setstring(name_str); args[1].setint32(24); /* step 3 - call |new person(...args)|, passing the arguments.
...* otherwise, convert the number to floating point (see the next example). ...
...ating point (see the next example). */ js::callargs args = js::callargsfromvp(argc, vp); args.rval().setint32(23); return true; returning a floating-point number // javascript return 3.14159; /* jsapi */ js::callargs args = js::callargsfromvp(argc, vp); args.rval().setdouble(3.14159); exception handling throw the most common idiom is to create a new error object and throw that. js_reporterror does this. ...
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nsIFile
remove(in boolean recursive); void reveal(); void setrelativedescriptor(in nsifile fromfile, in acstring relativedesc); attributes attribute type description directoryentries nsisimpleenumerator returns an enumeration of the elements in a directory. each element in the enumeration is an nsifile. read only. exceptions thrown ns_error_file_not_directory indicates that this nsifile does not reference a directory. diskspaceavailable print64 the number of bytes available to non-superuser on the disk volume containing the nsifile. read only. filesize print64 the value of this attribute is the number of bytes corresponding to the data represented by the file. on the mac, getting...
...ss to nspr or the c stdlib. there are problems that affect platforms on which a path does not fully specify a file because two volumes can have the same name (for example mac). this is solved by holding "private", native data in the nsifile implementation. this native data is lost when you convert to a string. do not pass to use with nspr or stdlib! read only. exceptions thrown ns_error_file_invalid_path indicates that this nsifile does not reference a symbolic link. constants constant value description normal_file_type 0 a normal file. directory_type 1 a directory/folder. delete_on_close 0x80000000 optional parameter used by opennsprfiledesc methods append() this function is used for cons...
...or constructing a descendant of the current nsifile. note: this method does not return a new nsifile; it modifies the object it was called on. if the old nsifile should be retained, use clone(). void append( in astring node ); parameters node a string which is intended to be a child node of the nsifile. this string must not contain a path separator character. exceptions thrown ns_error_file_unrecognized_path indicates that anode incorrectly contains a path separator character. native code only! appendnative this method is used for constructing a descendant of the current nsifile. [native character encoding variant] void appendnative( in acstring node ); parameters node a string that is intended to be a child node of the current nsifile. this string must not c...
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WebGL best practices - Web APIs
api, and it's often not obvious what the recommended ways to use it are. this page tackles recommendations across the spectrum of expertise, and not only highlights dos and don'ts, but also details why. you can rely on this document to guide your choice of approach, and ensure you're on the right track no matter what browser or hardware your users run. general topics address and eliminate webgl errors your application should run without generating any webgl errors (as returned by geterror). every webgl error is reported in the web console as a javascript warning with a descriptive message. after too many errors (32 in firefox), webgl stops generating descriptive messages, which really hinders debugging. the only errors a well-formed page generates are out_of_memory and context_lost. know y...
...by default, so a flush can help fill the gap, as well. use webgl.flush() when not using requestanimationframe when not using raf, (such as when using rpaf; see below) use webgl.flush() to encourage eager execution of enqueued commands. because raf is directly followed by the frame boundary, an explicit webgl.flush() isn't really needed with raf. avoid blocking api calls in production (e.g. geterror, getparameter) certain webgl entry points cause synchronous stalls on the calling thread. even basic requests can take as long as 1ms, but they can take even longer if they need to wait for all graphics work to be completed (with an effect similar to glfinish() in native opengl). in production code, avoid such entry points, especially on the browser main thread where they can cause the entire p...
...calling thread. even basic requests can take as long as 1ms, but they can take even longer if they need to wait for all graphics work to be completed (with an effect similar to glfinish() in native opengl). in production code, avoid such entry points, especially on the browser main thread where they can cause the entire page to jank (often including scrolling or even the whole browser). geterror(): causes a flush + round-trip to fetch errors from the gpu process). for example, within firefox, the only time glgeterror is checked is after allocations (bufferdata, *teximage*, texstorage*) to pick up any gl_out_of_memory errors. getshader/programparameter(), getshader/programinfolog(), other gets on shaders/programs: flush + shader compile + round-trip, if not done after shader comp...
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Event reference
the rendering model. this article offers a list of events that can be sent; some are standard events defined in official specifications, while others are events used internally by specific browsers; for example, mozilla-specific events are listed so that add-ons can use them to interact with the browser. most common categories resource events event name fired when error a resource failed to load. abort the loading of a resource has been aborted. load a resource and its dependent resources have finished loading. beforeunload the window, the document and its resources are about to be unloaded. unload the document or a dependent resource is being unloaded. network events event name fired whe...
... blur an element has lost focus (does not bubble). focusin an element is about to receive focus (does bubble). focusout an element is about to lose focus (does bubble). websocket events event name fired when open a websocket connection has been established. message a message is received through a websocket. error a websocket connection has been closed with prejudice (some data couldn't be sent for example). close a websocket connection has been closed. session history events event name fired when pagehide a session history entry is being traversed from. pageshow a session history entry is being traversed to. popstate a session ...
...t works with other inputs such as speech recognition). compositionupdate a character is added to a passage of text being composed. compositionend the composition of a passage of text has been completed or canceled. view events event name fired when fullscreenchange an element was toggled to or from fullscreen mode. fullscreenerror it was impossible to switch to fullscreen mode for technical reasons or because the permission was denied. resize the document view has been resized. scroll the document view or an element has been scrolled. clipboard events event name fired when cut the selection has been cut and copied to the clipboard copy the selec...
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Debugging HTML - Learn web development
previous overview: introduction to html next writing html is fine, but what if something goes wrong, and you can't work out where the error in the code is? ...
... previous overview: introduction to html next writing html is fine, but what if something goes wrong, and you can't work out where the error in the code is? ...
...p you find and fix errors in html. prerequisites: html familiarity, as covered in, for example, getting started with html, html text fundamentals, and creating hyperlinks. objective: learn the basics of using debugging tools to find problems in html. debugging isn't scary when writing code of some kind, everything is usually fine, until that dreaded moment when an error occurs — you've done something wrong, so your code doesn't work — either not at all, or not quite how you wanted it to. for example, the following shows an error reported when trying to compile a simple program written in the rust language. here, the error message is relatively easy to understand — "unterminated double quote string". if you look at the listing, you can probably see how pri...
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Index
ased network security services (nss) 3.56 on 21 august 2020, which is a minor release. 159 nss api guidelines newsgroup: mozilla.dev.tech.crypto 160 nss certverify log nss all the nss verify functions except, the *verifynow() functions, take a parameter called 'certverifylog'. if you supply the log parameter, nss will continue chain validation after each error . the log tells you what the problem was with the chain and what certificate in the chain failed. 161 nss certificate download specification nss this document describes the data formats used by nss 3.x for installing certificates. this document is currently being revised and has not yet been reviewed for accuracy. 162 nss code coverage nss no summary! ...
...s mode. true means to verify that the module is in fips mode, while false means to verify that the module is not in fips mode. -create create new certificate, key, and module databases. use the -dbdir directory argument to specify a directory. if any of these databases already exist in a specified directory, modutil returns an error message. -default modulename specify the security mechanisms for which the named module will be a default provider. the security mechanisms are specified with the -mechanisms argument. -delete modulename delete the named module. the default nss pkcs #11 module cannot be deleted. -disable modulename disable all slots ...
...symmetric key to be used to encrypt the certificates and other meta-data. -r dumps all of the data in raw (binary) form. this must be saved as a der file. the default is to return information in a pretty-print ascii format, which displays the information about the certificates and public keys in the p12 file. ...
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nsIHttpChannel
nderlying http transaction should be allowed to be pipelined with other transactions. this should be set to false, for example, if the application knows that the corresponding document is likely to be very large. this attribute is true by default, though other factors may prevent pipelining. this attribute may only be set before the channel is opened. exceptions thrown ns_error_failure if set after the channel has been opened. redirectionlimit unsigned long this attribute specifies the number of redirects this channel is allowed to make. if zero, the channel will fail to redirect and will generate a ns_error_redirect_loop failure status. note: an http redirect results in a new channel being created. if the new channel supports...
...ibute may only be set before the channel is opened. note: the channel may silently refuse to set the referer: header if the uri does not pass certain security checks (e.g., a "https://" url will never be sent as the referrer for a plaintext http request). the implementation is not required to throw an exception when the referrer uri is rejected. exceptions thrown ns_error_in_progress if set after the channel has been opened. ns_error_failure if used for setting referrer during visitrequestheaders(). getting the value will not throw. requestmethod acstring set or get the http request method (default is "get"). setter is case insensitive; getter returns an uppercase string. this attribute may only be set before the c...
...e; getter returns an uppercase string. this attribute may only be set before the channel is opened. note: the data for a "post" or "put" request can be configured via nsiuploadchannel. however, after setting the upload data, it may be necessary to set the request method explicitly. the documentation for nsiuploadchannel has further details. exceptions thrown ns_error_in_progress if set after the channel has been opened. requestsucceeded boolean returns true if the http response code indicates success. the value of nsirequest.status() will be ns_ok even when processing a 404 file not found response because such a response may include a message body that (in some cases) should be shown to the user. use this attribute to disting...
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nsIZipWriter
on the archive can be performed one by one, or queued for later execution. 1.0 66 introduced gecko 1.9 inherits from: nsisupports last changed in gecko 1.9 (firefox 3) once all the operations you wish to perform are added to the queue, a call to processqueue() will perform the operations in the order they were added to the queue. operations performed on the queue throw any errors that occur out to the observer. attempting to perform a synchronous operation on the interface while the background queue is in progress will throw an ns_error_in_progress exception. file and directory names should use slashes ("/") as separators and should not begin with a slash. note: although it is not necessary to add directory entries in order to add file entries within them, some zip ut...
...en(in nsifile afile, in print32 aioflags); void processqueue(in nsirequestobserver aobserver, in nsisupports acontext); void removeentry(in autf8string azipentry, in boolean aqueue); attributes attribute type description comment acstring gets or sets the comment associated with the currently open zip file. exceptions thrown ns_error_not_initialized if no zip file has been opened. file nsifile the zip file being written to. read only. inqueue boolean true if operations are being performed in the background queue, or false if background operations are not in progress. read only. constants constant value description compression_none 0 do not compr...
...ath. amodtime the modification time of the entry in microseconds. acompression one of the compression constants, indicating the compression method to use. achannel the channel from which to get the data. aqueue if true, the operation is queued for later execution. if false, the operation is performed immediately. will be performed when processqueue() is called. exceptions thrown ns_error_not_initialized no zip file is open. ns_error_file_already_exists the specified path already exists in the zip file. ns_error_in_progress the zip writer is already performing another operation. addentrydirectory() adds a new directory entry to the zip file. if azipentry does not end with "/" then it will be added. note: although it is not necessary to add directory entries in order to ad...
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DOMException - Web APIs
this field is used for historical reasons. ...
...this field is used for historical reasons. ...
...ssing a property of a web api. this is basically how error conditions are described in web apis. each exception has a name, which is a short "camelcase" style string identifying the error or abnormal condition. constructor domexception() returns a domexception object with a specified message and name. properties domexception.code read only returns a short that contains one of the error code constants, or 0 if none match. this field is used for historical reasons. new dom exceptions don't use this anymore: they put this info in the domexception.name attribute. domexception.message read only returns a domstring representing a message or description associated with the given error name. domexception.name read only returns a domstring that contains one of the strings associat...
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Template Logging - Archive of obsolete content
« previous debugging problems with a template can be difficult as many problems are logic errors that are often not possible to determine automatically. for example, if you spell a value wrong, no data may be returned, but the template system won't know that that this was because of a spelling error, or simply that there shouldn't be any data anyway. fortunately, some debugging and logging support is provided with templates that may help. logging template results there are two main ways in which template errors may be detected. the first debugging method involves logging all new results that apply to the template due to the data changing as well as logging results that are changed or removed. in addition, each result generated when the template is first created and initialized i...
...sult generated when the template is first created and initialized is logged. this logging of result changes is not done by default; it must be enabled with a flag. <vbox datasources="..." flags="logging"/> the flags attribute on the root element of the template should include the logging flag. if other flags are used as well, separate them with spaces. enabling logging will output details to the error console for each result. the error console can be found on the firefox tools menu. this logging of results can be very useful for debugging, but remember to remove this flag when you have finished and the template works correctly, as the logging can take up extra time that is not necessary when the template is working. each result is logged in a form much like the following: in template with id r...
...removed inactive result for query 2 (active query is 1) a result no longer matches, but it is inactive and doesn't have any content. this is because the first query overrides it. removed inactive result for query 2 (no new active query) a result no longer matches, but it is inactive and doesn't have any content. however, no other query overrides it. no changes to the content will occur. template errors the second type of template error is a syntax error is the template rules, for example, a missing attribute or a tag out of place. these types of errors are also logged to the console, however, these types of errors are logged whether the logging flag is set or not. the following lists the errors that can occur and an explanation of what the problem is. querytype attribute doesn't specify a val...
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Enc Dec MAC Using Key Wrap CertReq PKCS10 CSR
as a pkcs 11 csr. generates encryption/mac keys and outputs public key as pkcs11 certificate signing request /* this source code form is subject to the terms of the mozilla public * license, v. 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/. ...
...e, secupwdata *pwdata) { ck_mechanism_type mechanism; secoidtag algtag; pk11rsagenparams rsaparams; void *params; seckeyprivatekey *privkey = null; secstatus rv; unsigned char randbuf[blocksize + 1]; rv = generaterandom(randbuf, blocksize); if (rv != secsuccess) { fprintf(stderr, "error while generating the random numbers : %s\n", port_errortostring(rv)); goto cleanup; } pk11_randomupdate(randbuf, blocksize); switch (keytype) { case rsakey: rsaparams.keysizeinbits = size; rsaparams.pe = publicexponent; mechanism = ckm_rsa_pkcs_key_pair_gen; algtag ...
...getsignaturealgorithmoidtag(privkey->keytype, hashalgtag); if (algid == sec_oid_unknown) { pr_fprintf(pr_stderr, "unknown key or hash type for issuer.\n"); goto cleanup; } rv = secoid_setalgorithmid(arena, &cert->signature, algid, 0); if (rv != secsuccess) { pr_fprintf(pr_stderr, "could not set signature algorithm id.\n%s\n", port_errortostring(rv)); goto cleanup; } /* we only deal with cert v3 here */ *(cert->version.data) = 2; cert->version.len = 1; der.len = 0; der.data = null; dummy = sec_asn1encodeitem (arena, &der, cert, sec_asn1_get(cert_certificatetemplate)); if (!dummy) { pr_fprintf(pr_stderr, "could not encode certificate.\n"); ...
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Establishing a connection: The WebRTC perfect negotiation pattern - Web APIs
"okay, never mind, drop my offer and i'll consider yours instead." an impolite peer, which always ignores incoming offers that collide with its own offers. it never apologizes or gives up anything to the polite peer. any time a collision occurs, the impolite peer wins. this way, both peers know exactly what should happen if there are collisions between offers that have been sent. responses to error conditions become far more predictable. how you determine which peer is polite and which is impolite is generally up to you. it could be as simple as assigning the polite role to the first peer to connect to the signaling server, or you could do something more elaborate like having the peers exchange random numbers and assigning the polite role to the winner. however you make the determination, ...
...alled by either of the two end-points that want to talk to one another. it doesn't matter who does it first; the negotiation will just work. async function start() { try { const stream = await navigator.mediadevices.getusermedia(constraints); for (const track of stream.gettracks()) { pc.addtrack(track, stream); } selfvideo.srcobject = stream; } catch(err) { console.error(err); } } this isn't appreciably different from older webrtc connection establishment code. the user's camera and microphone are obtained by calling getusermedia(). the resulting media tracks are then added to the rtcpeerconnection by passing them into addtrack(). then, finally, the media source for the self-view <video> element indicated by the selfvideo constant is set to the camera and mic...
...ionneeded event first, we implement the rtcpeerconnection event handler onnegotiationneeded to get a local description and send it using the signaling channel to the remote peer. let makingoffer = false; pc.onnegotiationneeded = async () => { try { makingoffer = true; await pc.setlocaldescription(); signaler.send({ description: pc.localdescription }); } catch(err) { console.error(err); } finally { makingoffer = false; } }; note that setlocaldescription() without arguments automatically creates and sets the appropriate description based on the current signalingstate. the set description is either an answer to the most recent offer from the remote peer or a freshly-created offer if there's no negotiation underway. here, it will be always be an offer, because the n...
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core/promise - Archive of obsolete content
complementing its non-blocking nature. while this has a good reason and many advantages, it comes with a price. ...
...n-blocking nature. while this has a good reason and many advantages, it comes with a price. ...
...e. while this has a good reason and many advantages, it comes with a price. ...
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Making asynchronous programming easier with async and await - Learn web development
g = await promise.resolve("hello"); }; hello().then(alert); of course, the above example is not very useful, although it does serve to illustrate the syntax. let's move on and look at a real example. ...
...omise.resolve("hello"); }; hello().then(alert); of course, the above example is not very useful, although it does serve to illustrate the syntax. let's move on and look at a real example. ...
...status: ${response.status}`); } else { let myblob = await response.blob(); let objecturl = url.createobjecturl(myblob); let image = document.createelement('img'); image.src = objecturl; document.body.appendchild(image); } } myfetch() .catch(e => { console.log('there has been a problem with your fetch operation: ' + e.message); }); it makes code much simpl...
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NSS Tools pk12util
t should be noted that the the crypto provider may be the softtoken module or an external hardware module. it may be the case that the cryptographic module does not support the requested algorithm and a best fit will be selected, likely to be the default. ...
...that the the crypto provider may be the softtoken module or an external hardware module. it may be the case that the cryptographic module does not support the requested algorithm and a best fit will be selected, likely to be the default. if no suitable replacement for the desired algorithm can be found a "no security module can perform the requested operation" will appear on the error message. ...
...xternal hardware module. it may be the case that the cryptographic module does not support the requested algorithm and a best fit will be selected, likely to be the default. if no suitable replacement for the desired algorithm can be found a "no security module can perform the requested operation" will appear on the error message. ...
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Starting WebLock
vice manager. you can then use the service manager to add the component to the category: nsresult rv; nscomptr<nsiservicemanager> servman = do_queryinterface((nsisupports*)acompmgr, &rv); if (ns_failed(rv)) return rv; do_queryinterface the previous code uses the special nscomptr function do_queryinterface that lets you queryinterface without having to worry about reference counting, error handling, and other overhead. the do_queryinterface knows what interface to qi to based on the nscomptr that is being assigned into. we could have just as easily have used the raw queryinterface() method, but using nscomptr is much more economical (see smart pointers). once you have a nsiservicemanager reference, you can ask it for the service you are interested in. this process is similar to u...
...nother interface that takes a contract id. here we'll use the latter. the first parameter to the getservicebycontractid is of course the contract id, which is defined in the nsxpcom.h header file. the next parameter is a nifty macro that returns the iid for the interface name that you pass in. the last parameter assigns an out interface pointer to a nscomptr. assuming there weren't any unexpected errors, the variable catman holds the nsicategorymanager interface pointer, which you can use to add the component as a startup observer by calling a method on the nsicategorymanager. the next step is to figure out which parameters to pass to the method. there is a category name and a name-value pair, but since the name-value pair meaning is category-specific, you need to figure out which category to ...
... * element is the first element upon the first call. must be * preceded by a call to hasmoreelements() which returns pr_true. * this method is generally called within a loop to iterate over * the elements in the enumerator. * * @see hasmoreelements() * @return ns_ok if the call succeeded in returning a non-null * value through the out parameter. * ns_error_failure if there are no more elements * to enumerate. * @return the next element in the enumeration. */ nsisupports getnext(); }; implementing weblock once you have defined the interfaces that the component will implement, you can begin to write the implementation code that will actually carry out the web locking functionality. the weblock component impleme...
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MediaDevices.getUserMedia() - Web APIs
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. 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.
...r 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: navigator.mediadevices.getusermedia(constraints) .then(function(stream) { /* use the stream */ }) .catch(function(err) { /* handle the error */ }); note: if the current document isn't loaded securely, navigator.mediadevices will be undefined, and you cannot use getusermedia(). see security for more information...
...ng the types of media to request, along with any requirements for each type. the constraints parameter is a mediastreamconstraints object with two members: video and audio, describing the media types requested. either or both must be specified. if the browser cannot find all media tracks with the specified types that meet the constraints given, then the returned promise is rejected with notfounderror. the following requests both audio and video without any specific requirements: { audio: true, video: true } if true is specified for a media type, the resulting stream is required to have that type of track in it. if one cannot be included for any reason, the call to getusermedia() will result in an error. while information about a user's cameras and microphones are inaccessible for priv...
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Space Manager Detailed Design - Archive of obsolete content
ayoffset the y-offset of where the band begins. the coordinate is * relative to the upper-left corner of the local coordinate space * @param amaxsize the size to use to constrain the band data * @param abanddata [in,out] used to return the list of trapezoids that * describe the available space and the unavailable space * @return ns_ok if successful and ns_error_failure if the band data is not * not large enough. the 'count' member of the band data struct * indicates how large the array of trapezoids needs to be */ nsresult getbanddata(nscoord ayoffset, const nssize& amaxsize, nsbanddata& abanddata) const; /** * add a rectangular region of unavailable space. the ...
...banddata& abanddata) const; /** * add a rectangular region of unavailable space. the space is * relative to the local coordinate system. * * the region is tagged with a frame * * @param aframe the frame used to identify the region. must not be null * @param aunavailablespace the bounding rect of the unavailable space * @return ns_ok if successful * ns_error_failure if there is already a region tagged with aframe */ nsresult addrectregion(nsiframe* aframe, const nsrect& aunavailablespace); /** * resize the rectangular region associated with aframe by the specified * deltas. the height change always applies to the bottom edge or the existing * rect. you specify whether the width change applies to the left ...
... */ nsresult addrectregion(nsiframe* aframe, const nsrect& aunavailablespace); /** * resize the rectangular region associated with aframe by the specified * deltas. the height change always applies to the bottom edge or the existing * rect. ...
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Handling common JavaScript problems - Learn web development
se 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 ensure better quality, less error-prone javascript code using a linter, which points out errors and can also flag up warnings about bad practices, etc., and be customized to be stricter or more relaxed in their error/warning reporting. the javascript/ecmascript linters we'd recommend are jshint and eslint; these can be used in a variety of ways, some of which we'll detail below. online the jshint homepage provides an online lin...
... code editor plugins it is not very convenient to have to copy and paste your code over to a web page to check its validity several times. what you really want is a linter that will fit into your standard workflow with the minimum of hassle. many code editors have linter plugins, for example github's atom code editor has a jshint plugin available. ...
...s enter/return to search for linting-related packages. you should see a package called lint at the top of the list. install this first (using the install button), as other linters rely on it to work. after that, install the linter-jshint plugin. after the packages have finished installing, try loading up a javascript file: you'll see any issues highlighted with green (for warnings) and red (for errors) circles next to the line numbers, and a separate panel at the bottom provides line numbers, error messages, and sometimes suggested values or other fixes. other popular editors have similar linting packages available. for example, see the "plugins for text editors and ides" section of the jshint install page. other uses there are other ways to use such linters; you can read about them on t...
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NSS tools : pk12util
is must be saved as a der file. the default is to return information in a pretty-print ascii format, which displays the information about the certificates and public keys in the p12 file. -v enable debug logging when importing. -w p12filepasswordfile specify the text file containing the pkcs #12 file password. -w p12filepassword specify the pkcs #12 file password. ...
...ult is to return information in a pretty-print ascii format, which displays the information about the certificates and public keys in the p12 file. -v enable debug logging when importing. -w p12filepasswordfile specify the text file containing the pkcs #12 file password. -w p12filepassword specify the pkcs #12 file password. ...
...mation in a pretty-print ascii format, which displays the information about the certificates and public keys in the p12 file. -v enable debug logging when importing. -w p12filepasswordfile specify the text file containing the pkcs #12 file password. -w p12filepassword specify the pkcs #12 file password. ...
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<input>: The Input (Form Input) element - HTML: Hypertext Markup Language
if the format is invalid. in addition to using css to style inputs based on the :valid or :invalid ui states based on the current state of each input, as noted in the ui pseudo-classes section above, the browser provides for client-side validation on (attempted) form submission. ...
...r :invalid ui states based on the current state of each input, as noted in the ui pseudo-classes section above, the browser provides for client-side validation on (attempted) form submission. on form submission, if there is a form control that fails constraint validation, supporting browsers will display an error message on the first invalid form control; displaying a default message based on the error type, or a message set by you. ...
...straint validation, supporting browsers will display an error message on the first invalid form control; displaying a default message based on the error type, or a message set by you. some input types and other attributes place limits on what values are valid for a given input. for example, <input type="number" min="2" max="10" step="2"> means only the number 2, 4, 6, 8, or 10 are valid. several errors could occur, including a rangeunderflow error if the value is less than 2, rangeoverflow if greater than 10, stepmismatch if the value is a number between 2 and 10, but not an even integer (does not match the requirements of the step attribute), or typemismatch if the value is not a number. for the input types whose domain of possible values is periodic (that is, at the highest possible value, ...
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Modularization techniques - Archive of obsolete content
const nsiid &aiid, void **aresult); ns_imethod_(void) lockfactory(prbool alock); }; /* * nssample implementation */ nssample::nssample() { mrefcnt = 0; } nssample::~nssample() { assert(mrefcnt == 0); } ns_imethod nssample::queryinterface(const nsiid &aiid, void **aresult) { if (aresult == null) { return ns_error_null_pointer; } // always null result, in case of failure *aresult = null; if (aiid.equals(kisupportsiid)) { *aresult = (void *) this; } else if (aiid.equals(kisampleiid)) { *aresult = (void *) this; } if (aresult != null) { return ns_error_no_interface; } addref(); return ns_ok; } nsrefcount nssample::addref() { return ++mrefcnt; } nsrefcount nssample::rel...
...return 0; // don't access mrefcnt after deleting! ...
... } return mrefcnt; } ns_imethodimp nssamplefactory::createinstance(nsisupports ...
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Obsolete: XPCOM-based scripting for NPAPI plugins - Archive of obsolete content
allers are allowed to call this object's scritable methods. ...
...*aflags) {*aflags = nsiclassinfo::plugin_object | nsiclassinfo::dom_object; return ns_ok;} ns_imethod getimplementationlanguage(pruint32 *aimplementationlanguage) {*aimplementationlanguage = nsiprogramminglanguage::cplusplus; return ns_ok;} // the rest of the methods can safely return error codes... ...
...timplementationlanguage(pruint32 *aimplementationlanguage) {*aimplementationlanguage = nsiprogramminglanguage::cplusplus; return ns_ok;} // the rest of the methods can safely return error codes... ...
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NSS tools : pk12util
symmetric key to be used to encrypt the certificates and other meta-data. -r dumps all of the data in raw (binary) form. this must be saved as a der file. the default is to return information in a pretty-print ascii format, which displays the information about the certificates and public keys in the p12 file. ...
...certificates and other meta-data. -r dumps all of the data in raw (binary) form. this must be saved as a der file. the default is to return information in a pretty-print ascii format, which displays the information about the certificates and public keys in the p12 file. ...
...-data. -r dumps all of the data in raw (binary) form. this must be saved as a der file. the default is to return information in a pretty-print ascii format, which displays the information about the certificates and public keys in the p12 file. ...
...And 11 more matches

HTMLScriptElement - Web APIs
hods for manipulating the behavior and execution of <script> elements (beyond the inherited htmlelement interface). javascript files should be served with the application/javascript mime type, but browsers are lenient and block them only if the script is served with an image type (image/*), video type (video/*), audio type (audio/*), or text/csv. if the script is blocked, its element receives an error event; otherwise, it receives a load event. <div id="interfacediagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 20%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 120" preserveaspectratio="xminymin meet"><a xlink:href="/docs/web/api/eventtarget" target="_top"><rect x...
...he specification. these algorithms describe the core ideas, but they rely on the parsing rules for <script> start and end tags in html, in foreign content, and in xml; the rules for the document.write() method; the handling of scripting; and so on. htmlscriptelement.crossorigin is a domstring reflecting the cors setting for the script element. for scripts from other origins, this controls if error information will be exposed. htmlscriptelement.text is a domstring that joins and returns the contents of all text nodes inside the <script> element (ignoring other nodes like comments) in tree order. on setting, it acts the same way as the textcontent idl attribute. note: when inserted using the document.write() method, <script> elements execute (typically synchronously), but when inser...
...ethods; inherits methods from its parent, htmlelement. examples dynamically importing scripts let's create a function that imports new scripts within a document creating a <script> node immediately before the <script> that hosts the following code (through document.currentscript). these scripts will be asynchronously executed. for more details, see the defer and async properties. ...
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Promise - JavaScript
the final value, the asynchronous method returns a promise to supply the value at some point in the future. a promise is in one of these states: pending: initial state, neither fulfilled nor rejected. fulfilled: meaning that the operation completed successfully. rejected: meaning that the operation failed. a pending promise can either be fulfilled with a value, or rejected with a reason (error). when either of these options happens, the associated handlers queued up by a promise's then method are called. if the promise has already been fulfilled or rejected when a corresponding handler is attached, the handler will be called, so there is no race condition between an asynchronous operation completing and its handlers being attached. as the promise.prototype.then() and promise.prototype...
....then(handlefulfilledb,handlerejectedb) .then(handlefulfilledc,handlerejectedc); // or, perhaps better ... const mypromise = (new promise(myexecutorfunc)) .then(handlefulfilleda) .then(handlefulfilledb) .then(handlefulfilledc) .catch(handlerejectedany); handling a rejected promise too early has consequences further down the promise chain. sometimes there is no choice, because an error must be handled immediately. (see throw -999 in the example, below, for a technique to handle the consequences.) on the other hand, in the absence of an immediate need, it is simpler to leave out error handling until a final .catch() statement. the signatures of these two functions are simple, they accept a single parameter of any type. these functions are written by you, the programmer. the ter...
...promise generator will utilize reject() while setting up an asynchronous call, or within the call-back, or both. the function promisegetword() illustrates how an api function might generate and return a promise in a self contained manner. note that function troublewithgetnumber() ends with a throw(). that is forced because an es6 promise chain goes through all the .then() promises, even after an error, and without the "throw()", the error would seem "fixed". this is a hassle, and for this reason, it is common to omit rejectionfunc throughout the chain of .then() promises, and just have a single rejectionfunc in the final catch(). the alternative is to throw a special value (in this case "-999", but a custom error type would be more appropriate). this code can be run under nodejs. comprehensio...
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JavaScript Debugger Service - Archive of obsolete content
s.jsdidebuggerservice); jsd.on(); // enables the service till firefox 3.6, for 4.x use asyncon if (jsd.ison) jsd.off(); // disables the service hooks jsd operates using the events hook mechanism. next, we add code to the various hooks. ...
...vice); jsd.on(); // enables the service till firefox 3.6, for 4.x use asyncon if (jsd.ison) jsd.off(); // disables the service hooks jsd operates using the events hook mechanism. next, we add code to the various hooks. ...
...ce hooks jsd operates using the events hook mechanism. next, we add code to the various hooks. jsd.scripthook = { onscriptcreated: function(script) { // your function here }, onscriptdestroyed: function(script) { // your function here } }; jsd.errorhook = { onerror: function(message, filename, lineno, colno, flags, errnum, exc) { // your function here } }; // triggered when jsd.errorhook[onerror] returns false jsd.debughook = { onexecute: function(frame, type, rv) { // your function here } }; jsd.enumeratescripts({ // the enumeratescript method will be called once for every script jsd knows about enumeratescript: function(script) { // your function here } }); a simple stack trace here, we will show how to implement a simple javascript stack trace using the jsd. ...
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Eclipse CDT
fig", and set it to the path of your .mozconfig file relative to the top source directory. set any other environment variables you want to set for the build, then close the project properties window. now when you hit the build button (the little hammer icon), you should see the source build in the console tab at the bottom of the window. the benefit of building from inside eclipse is that build errors will appear in the problems tab at the bottom of the window, and from there you can double click on the build error and it will take you straight to the source file and line where the problem occurred. for this to work reliably though, you still need to build using slow -j1 -w builds, so that make outputs non-interleaved "entering"/"leaving" lines. it also used to be necessary to add the followi...
...click "new", then select "c/c++ application". ...
...ipse is open source, of course so if anyone feels like doing a bit of java hacking to fix these issues that'd be great. headers are only parsed once for performance reasons, eclipse only processes header files that have include guards once, using the compiler options for the first source file it encounters that includes that header (eclipse bug 380511). ...
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nsISmsRequestManager
.createinstance(components.interfaces.nsismsrequestmanager); method overview long addrequest(in nsidommozsmsrequest arequest); long createrequest(in nsidommozsmsmanager amanager, out nsidommozsmsrequest arequest); void notifycreatemessagelist(in long arequestid, in long alistid, in nsidommozsmsmessage amessage); void notifygetsmsfailed(in long arequestid, in long aerror); void notifygotnextmessage(in long arequestid, in nsidommozsmsmessage amessage); void notifygotsms(in long arequestid, in nsidommozsmsmessage amessage); void notifymarkedmessageread(in long arequestid, in bool aread); void notifymarkmessagereadfailed(in long arequestid, in long aerror); void notifynomessageinlist(in long arequestid); void notifyreadmessagelistfailed(in long arequesti...
...tifygotnextmessage(in long arequestid, in nsidommozsmsmessage amessage); void notifygotsms(in long arequestid, in nsidommozsmsmessage amessage); void notifymarkedmessageread(in long arequestid, in bool aread); void notifymarkmessagereadfailed(in long arequestid, in long aerror); void notifynomessageinlist(in long arequestid); void notifyreadmessagelistfailed(in long arequestid, in long aerror); void notifysmsdeleted(in long arequestid, in bool adeleted); void notifysmsdeletefailed(in long arequestid, in long aerror); void notifysmssendfailed(in long arequestid, in long aerror); void notifysmssent(in long arequestid, in nsidommozsmsmessage amessage); constants all sms related errors that could apply to smsrequest objects. constant value description success_no_error 0 ...
...long addrequest( in nsidommozsmsrequest arequest ); parameters arequest an smsrequest. return value the request id. ...
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Grammar and types - JavaScript
is converted into a sequence of input elements which are tokens, control characters, line terminators, comments, or whitespace. (spaces, tabs, and newline characters are considered whitespace.) comments the syntax of comments is the same as in c++ and in many other languages: // a one line comment /* this is a longer, * multi-line comment */ /* you can't, however, /* nest comments */ syntaxerror */ comments behave like whitespace, and are discarded during script execution. note: you might also see a third type of comment syntax at the start of some javascript files, which looks something like this: #!/usr/bin/env node. this is called hashbang comment syntax, and is a special comment used to specify the path to a particular javascript engine that should execute the script. see hashba...
...clared global variable. it also generates a strict javascript warning. undeclared global variables can often lead to unexpected behavior. thus, it is discouraged to use undeclared global variables. evaluating variables a variable declared using the var or let statement with no assigned value specified has the value of undefined. ...
...lue of undefined. an attempt to access an undeclared variable results in a referenceerror exception being thrown: var a; console.log('the value of a is ' + a); // the value of a is undefined console.log('the value of b is ' + b); // the value of b is undefined var b; // this one may puzzle you until you read 'variable hoisting' below console.log('the value of c is ' + c); // uncaught referenceerror: c is not defined let x; console.log('the value of x is ' + x); // the value of x is undefined console.log('the value of y is ' + y); // uncaught referenceerror: y is not defined let y; you can use undefined to determine whether a variable has a value. in the following code, the variable input is not assigned a value, and the if statement evaluates to true. var input; if (input === undefined...
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try...catch - JavaScript
ore information on javascript exceptions. unconditional catch-block when a catch-block is used, the catch-block is executed when any exception is thrown from within the try-block. for example, when the exception occurs in the following code, control transfers to the catch-block. try { throw 'myexception'; // generates an exception } catch (e) { // statements to handle any exceptions logmyerrors(e); // pass exception object to error handler } the catch-block specifies an identifier (e in the example above) that holds the value of the exception; this value is only available in the scope of the catch-block. conditional catch-blocks you can create "conditional catch-blocks" by combining try...catch blocks with if...else if...else structures, like this: try { myroutine(); // may thro...
...ck specifies an identifier (e in the example above) that holds the value of the exception; this value is only available in the scope of the catch-block. ...
...ple above) that holds the value of the exception; this value is only available in the scope of the catch-block. ...
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LiveConnect Overview - Archive of obsolete content
e information about javascript exceptions. java to javascript communication if you want to use javascript objects in java, you must import the netscape.javascript package into your java file. this package defines the following classes: netscape.javascript.jsobject allows java code to access javascript methods and properties. netscape.javascript.jsexception allows java code to handle javascript errors. see the javascript reference for more information about these classes. locating the liveconnect classes in older versions of the netscape browser, these classes were distributed along with the browser. starting with javascript 1.2, these classes are delivered in a .jar file; in previous versions of javascript, these classes are delivered in a .zip file. for example, with netscape navigator 4 f...
... can pass it a javascript object as one of its argument. to do so, you must define the corresponding formal parameter of the method to be of type jsobject. also, any time you use javascript objects in your java code, you should put the call to the javascript object inside a try...catch statement which handles exceptions of type netscape.javascript.jsexception. this allows your java code to handle errors in javascript code execution which appear in java as exceptions of type jsexception. accessing javascript with jsobject for example, suppose you are working with the java class called javadog. as shown in the following code, the javadog constructor takes the javascript object jsdog, which is defined as type jsobject, as an argument: import netscape.javascript.*; public class javadog{ public...
...is.dogsex = (string)jsdog.getmember("sex"); } } notice that the getmember method of jsobject is used to access the properties of the javascript object. the previous example uses getmember to assign the value of the javascript property jsdog.breed to the java data member javadog.dogbreed. note: a more realistic example would place the call to getmember inside a try...catch statement to handle errors of type jsexception. see handling javascript exceptions in java for more information. to get a better sense of how getmember works, look at the definition of the custom javascript object dog: function dog(breed,color,sex){ this.breed = breed; this.color = color; this.sex = sex; } you can create a javascript instance of dog called gabby as follows: var gabby = new dog("lab", "chocolate"...
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L20n Javascript API
ring) and linkresource(string) might be better suited for adding resources. ctx.addeventlistener(event: string, callback: function) register an event handler on the context instance. currently available event types: ready - fired when all resources are available and the context instance is ready to be used. this event is also fired after each change to locale order (retranslation). ...
...(string) might be better suited for adding resources. ctx.addeventlistener(event: string, callback: function) register an event handler on the context instance. currently available event types: ready - fired when all resources are available and the context instance is ready to be used. this event is also fired after each change to locale order (retranslation). ...
...an event handler on the context instance. currently available event types: ready - fired when all resources are available and the context instance is ready to be used. this event is also fired after each change to locale order (retranslation). error - fired when an error occurs which prevents the context instance from working correctly or when the existing translations are buggy. the error object is passed as the first argument to callback. ...
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Enc Dec MAC Output Public Key as CSR
#define ns_certreq_header "-----begin new certificate request-----" #define ns_certreq_trailer "-----end new certificate request-----" typedef enum { gen_csr, encrypt, decrypt, unknown } commandtype; typedef enum { symkey = 0, mackey = 1, iv = 2, mac = 3, pad = 4, pubkey = 5, lab = 6 } headertype; /* this is conditionalized because port_errortostring was introduced with nss 3.13. * though pr_errortostring was available, support for it in nss wasn't. * fixme: samples should determine the version of nss that's available and refuse * to run if not 3.13 or higher. */ #ifndef port_errortostring #ifndef sec_error_base #define sec_error_base (-0x2000) #define port_errortostring(err) pr_errortostring((err), pr_lan...
... switch (*c) { case 'g': return gen_csr; case 'e': return encrypt; case 'd': return decrypt; default: return unknown; } } /* * wrap the symkey using public key */ secstatus wrapkey(pk11symkey* key, seckeypublickey *pubkey, secitem **wrappedkey) { secstatus rv; secitem *data = (secitem *)port_zalloc(sizeof(secitem)); if (!data) { pr_fprintf(pr_stderr, "error while allocating memory\n"); rv = secfailure; goto cleanup; } data->len = seckey_publickeystrength(pubkey); data->data = (unsigned char*)port_zalloc((data->len)*sizeof(unsigned int)); if (!data->data) { pr_fprintf(pr_stderr, "error while allocating memory\n"); rv = secfailure; goto cleanup; } rv = pk11_pubwrapsymkey(ckm_rsa_pkcs, ...
...har *pqgfile, secupwdata *pwdata) { ck_mechanism_type mechanism; secoidtag algtag; pk11rsagenparams rsaparams; void *params; seckeyprivatekey *privkey = null; secstatus rv; unsigned char randbuf[blocksize + 1]; rv = generaterandom(randbuf, blocksize); if (rv != secsuccess) { fprintf(stderr, "error while generating the random numbers : %s\n", port_errortostring(rv)); goto cleanup; } pk11_randomupdate(randbuf, blocksize); switch (keytype) { case rsakey: rsaparams.keysizeinbits = size; rsaparams.pe = publicexponent; mechanism = ckm_rsa_pkcs_key_pair_gen; algtag ...
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A Web PKI x509 certificate primer
rfc 3766 2358 200 --- bsi 1976 256 256 in other words, sha1 is now deprecated for new uses. we should use at least 3072 key sizes and at least a 256 ecc curve. thus the recommendation here is for the root to be 4096 if using rsa and p384 for the root key. (p384 also chosen for compatibility as most ssl/tls implementations support this part of suite b). ...
... bsi 1976 256 256 in other words, sha1 is now deprecated for new uses. we should use at least 3072 key sizes and at least a 256 ecc curve. thus the recommendation here is for the root to be 4096 if using rsa and p384 for the root key. (p384 also chosen for compatibility as most ssl/tls implementations support this part of suite b). ...
...ses. we should use at least 3072 key sizes and at least a 256 ecc curve. thus the recommendation here is for the root to be 4096 if using rsa and p384 for the root key. (p384 also chosen for compatibility as most ssl/tls implementations support this part of suite b). error codes in firefox here are some common errors that might be encountered when working with certificates in firefox. ...
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An Overview of XPCOM
elow. see a reference implementation of queryinterface for detailed information. ...
...ence count to 0 sample::sample() : mrefcnt(0) { } sample::~sample() { } // typical, generic implementation of qi ns_imethodimp sample::queryinterface(const nsiid &aiid, void **aresult) { if (!aresult) { return ns_error_null_pointer; } *aresult = null; if (aiid.equals(kisupportsiid)) { *aresult = (void *) this; } if (!*aresult) { return ns_error_no_interface; } // add a reference addref(); return ns_ok; } ns_imethodimp_(nsrefcnt) sample::addref() { return ++mrefcnt; } ns_imethodimp_(nsrefcnt) sample::release() { if (--mrefcnt == 0) { delete this; return 0; } // optional: return the reference count return mrefcnt; } object interface discovery inheritance is another very important topic in object oriented pro...
...ircle. but enabling exceptions and rtti may not be an option because of performance overhead and compatibility on many platforms, so xpcom does things differently. exceptions in xpcom c++ exceptions are not supported directly by xpcom. instead all exceptions must be handled within a given component, before crossing interface boundaries. in xpcom, all interface methods should return an nsresult error value (see the xpcom api reference for a listing of these error codes). these error code results become the "exceptions" that xpcom handles. instead of leveraging c++ rtti, xpcom uses the special queryinterface method that casts the object to the right interface if that interface is supported. every interface is assigned an identifier that gets generated from a tool commonly named "uuidgen". t...
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nsIAnnotationService
aname the annotation name. adata binary contents of the item to save. adatalen length of binary data. amimetype mime type of the data to store. must be supplied. aflags should be "0" for now, some flags will be defined in the future. aexpiration one of the expire_* constant value defined above. getpageannotation() this method retrieves the value of a given uri annotation. throws an error if the annotation does not exist. throws for binary annotations, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if the given annotation is set in a different type. nsivariant getpageannotation( in nsiuri auri, in autf8string aname ); parameters auri the uri on which the an...
...cific methods. the type-specific methods throw if the given annotation is set in a different type. nsivariant getpageannotation( in nsiuri auri, in autf8string aname ); parameters auri the uri on which the annotation is set. aname the annotation name. return value returns a page annotation. getitemannotation() this method retrieves the value of a given item annotation. throws an error if the annotation does not exist. throws for binary annotations, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if the given annotation is set in a different type. nsivariant getitemannotation( in long long aitemid, in autf8string aname ); parameters aitemid the item on wh...
...methods throw if the given annotation is set in a different type. nsivariant getitemannotation( in long long aitemid, in autf8string aname ); parameters aitemid the item on which the annotation is set. aname the annotation name. return value returns an item annotation. getpageannotationstring() this method retrieves the value of a given uri annotation in string format. throws an error if the annotation does not exist. throws for binary annotations, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if the given annotation is set in a different type. astring getpageannotationstring( in nsiuri auri, in autf8string aname ); parameters auri the uri on which the...
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nsIHttpServer
} } } reference : mozilla-release/netwerk/test/httpserver/nsihttpserver.idl [scriptable, uuid(cea8812e-faa6-4013-9396-f9936cbb74ec)] interface nsihttpserver : nsisupports { /** * starts up this server, listening upon the given port. ...
...ttpserver.idl [scriptable, uuid(cea8812e-faa6-4013-9396-f9936cbb74ec)] interface nsihttpserver : nsisupports { /** * starts up this server, listening upon the given port. * * @param port * the port upon which listening should happen, or -1 if no specific port is * desired * @throws ns_error_already_initialized * if this server is already started * @throws ns_error_not_available * if the server is not started and cannot be started on the desired port * (perhaps because the port is already in use or because the process does * not have privileges to do so) * @note * behavior is undefined if this method is called after stop() has been * called on this but before the provided callback function has been * called. */ void sta...
...en * 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 given file; must begin with "/" and * be a ...
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Signaling and video calling - Web APIs
then the name of the user that was clicked upon is obtained from the event target's textcontent property, and we check to be sure that it's not the same user that's trying to start the call. then we copy the name of the user we're calling into t...
...that for native apps, such as a phone application, you should not begin sending until the connection has been accepted at both ends, at a minimum, to avoid inadvertently sending video and/or audio data when the user isn't prepared for it. as soon as media is attached to the rtcpeerconnection, a negotiationneeded event is triggered at the connection, so that ice negotiation can be started. ...
...on has been accepted at both ends, at a minimum, to avoid inadvertently sending video and/or audio data when the user isn't prepared for it. as soon as media is attached to the rtcpeerconnection, a negotiationneeded event is triggered at the connection, so that ice negotiation can be started. if an error occurs while trying to get the local media stream, our catch clause calls handlegetusermediaerror(), which displays an appropriate error to the user as required. ...
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Object.create() - JavaScript
descriptors to be added to the newly-created object, with the corresponding property names. these properties correspond to the second argument of object.defineproperties(). return value a new object with the specified prototype object and properties. exceptions the proto parameter has to be either null or an object excluding primitive wrapper objects. ...
...wrapper objects. if proto is neither of these a typeerror is thrown. custom and null objects a new object created from a completely custom object (especially one created from the null object, which is basically a custom object with no members) can behave in unexpected ways. this is especially true when debugging, since common object-property converting/detecting utility functions may generate errors, or simply lose information (especially if using silent error-traps that ignore errors). for example, here are two objects: oco = object.create( {} ); // create a normal object ocn = object.create( null ); // create a "null" object > console.log(oco) // {} -- seems normal > console.log(ocn) // {} -- seems normal here too, so far oco.p = 1; // create a simple property on normal obj ocn.p = 0...
... = 0; // create a simple property on "null" obj > console.log(oco) // {p: 1} -- still seems normal > console.log(ocn) // {p: 0} -- still seems normal here too. but wait... as shown above, all seems normal so far. ...
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Handling common HTML and CSS problems - Learn web development
stently across browsers, which can make some features and styles not work for some users. responsive design problems are also common — a site that looks good in a desktop browser might provide a terrible experience on a mobile device, because the content is too small to read, or perhaps the site is slow because of expensive animations. let's go forth and look at how we can reduce cross browser errors that result from html/css. first things first: fixing general problems we said in the first article of this series that a good strategy to begin with is to test in a couple of modern browsers on desktop/mobile, to make sure your code is working generally, before going on to concentrate on the cross browser issues. in our debugging html and debugging css articles, we provided some really basic...
...ly, before going on to concentrate on the cross browser issues. in our debugging html and debugging css articles, we provided some really basic guidance on debugging html/css — if you are not familiar with the basics, you should definitely study these articles before carrying on. basically, it is a matter of checking whether your html and css code is well formed and doesn't contain any syntax errors. note: one common problem with css and html arises when different css rules begin to conflict with one another. this can be especially problematic when you are using third party code. for example, you might use a css framework and find that one of the class names it uses clashes with one you've already used for a different purpose. or you might find that html generated by some kind of third pa...
...s likely. for example .audio-player ul a. validation for html, validation involves making sure all your tags are properly closed and nested, you are using a doctype, and you are using tags for their correct purpose. a good strategy is to validate your code regularly. one service that can do this is the w3c markup validation service, which allows you to point to your code, and returns a list of errors: css has a similar story — you need to check that your property names are spelled correctly, property values are spelled correctly and are valid for the properties they are used on, you are not missing any curly braces, and so on. the w3c has a css validator available too, for this purpose. linters another good option to choose is a so-called linter application, which not only points out ...
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Extending a Protocol
vigator.echo() in your favorite editor, open dom/webidl/navigator.webidl at the end of the file, add: partial interface navigator { [throws] promise<domstring> echo(domstring astring); }; now we need to implement the echo() method in c++, so open up ./dom/base/navigator.h and let's add the method definition, so under public:: already_addrefed<promise> echo(const nsastring& astring, errorresult& arv); we use nsastring& as the domstring comes in from js as utf-16. this will matter later, as we will need to convert it to utf-8 (using nscstring) to send it to the parent process. now let's implement the method in ./dom/base/navigator.cpp - we add a little bit of error boilerplate stuff, as is customary: already_addrefed<promise> navigator::echo(const nsastring& astring, erro...
...6. this will matter later, as we will need to convert it to utf-8 (using nscstring) to send it to the parent process. now let's implement the method in ./dom/base/navigator.cpp - we add a little bit of error boilerplate stuff, as is customary: already_addrefed<promise> navigator::echo(const nsastring& astring, errorresult& arv) { if (!mwindow || !mwindow->getdocshell()) { arv.throw(ns_error_unexpected); return nullptr; } refptr<promise> echopromise = promise::create(mwindow->asglobal(), arv); if (ns_warn_if(arv.failed())) { return nullptr; } // message passing magic will happen here! return echopromise.forget(); } ok, let's ./mach build and make sure everything is compiling ok. once it's compiled, ./mach run and you should be able to spin up the developer co...
...otocol level. we've told gecko who manages who, and what messages we want to send. now we actually need to implement the "echochild" and "echoparent" actors to handle sending and receiving messages. and we also need to implement the actual management of these objects by dom/ipc/windowglobalchild.{h|cpp} and dom/ipc/windowglobalparent.{h|cpp}. if we now do ./mach build, it complains that "fatal error: 'mozilla/dom/echochild.h' file not found". that gives us a good place to start. defining echochild.h create ./dom/ipc/echochild.h, and define it as follows - the inline comments describe what's going on: #ifndef mozilla_dom_echochild_h #define mozilla_dom_echochild_h // we include the protocol, which is automatically generated for us. #include "mozilla/dom/pechochild.h" namespace mozilla {...
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PromiseWorker.jsm
have to be return wrapped in this meta object like so: return new promiseworker.meta({ thebuf: abuf, othernontrans: 'this string is not transfered but copied' }, {transfers: [abuf]}); a simple demo showing this in live action can be found here: github :: promiseworker transfer arraybuffer - worker side rejecting the promise to reject the promise from the worker, simply throw. various error objects are supported; each one has its specific meaning; they're described below. supported built-in javascript error are following: evalerror internalerror rangeerror referenceerror syntaxerror typeerror urierror in addition to them, stopiteration is also supported (note that stopiteration is deprecated). you can also construct and throw your own custom error objects as needed. wh...
...re supported; each one has its specific meaning; they're described below. supported built-in javascript error are following: evalerror internalerror rangeerror referenceerror syntaxerror typeerror urierror in addition to them, stopiteration is also supported (note that stopiteration is deprecated). you can also construct and throw your own custom error objects as needed. when custom error is caught by abstractworker, tomsg method will be called to convert it into message. the tomsg function should return an object which has exn property, that is the property key for the frommsg function in main thread side. // worker // define a custom error prototype. ...
...ion is deprecated). you can also construct and throw your own custom error objects as needed. when custom error is caught by abstractworker, tomsg method will be called to convert it into message. the tomsg function should return an object which has exn property, that is the property key for the frommsg function in main thread side. // worker // define a custom error prototype. function customerror(message) { this.message = message; } customerror.prototype.tomsg = function() { return { exn: 'customerror', message: this.message, }; }; // a function called by message. function func() { ... // throw a custom error. ...
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Python binding for NSS
ead. also, any "global" values which are set in python-nss are actually thread-local. examples of this are the various callbacks which can be set and their parameters. thus each thread gets it own set of callbacks. many methods/functions provide sane default (keyword) parameters freeing the python programmer from having to specify all parameters yet allowing them to be overriden when necessary. error codes are never returned from methods/functions. python-nss follows the existing python exception mechanism. any error reported by nss/nspr is converted into a python exception and raised. the exact error code, error description, and often contextual error information will be present in the exception object. enumerated constants used in the nss/nspr api's are available in the python module under...
... to the nss temporary database when they are loaded, but earlier code failed to to that. it's is not likely that an previous code was failing to pass initialization data or the der_is_signed flag so this change should be backwards compatible. fix bug #922247, pkcs12decoder.database_import() method. importing into a nss database would sometimes fail or segfault. error codes and descriptions were updated from upstream nspr & nss. the password callback did not allow for breaking out of a password prompting loop, now if none is returned from the password callback the password prompting is terminated. nss.nss_shutdown_context now called from initcontext destructor, this assures the context is shutdown even if the programmer forg...
... still best to explicitly shut it down, this is just failsafe. support was added for shutdown callbacks. ...
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Shell global objects
..]) load files named by string arguments. filename is relative to the calling script. evaluate(code[, options]) evaluate code as though it were the contents of a file. ...
...e calling script. evaluate(code[, options]) evaluate code as though it were the contents of a file. ...
...ere the contents of a file. ...
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Creating the Component Code
code, is expected to return an nsifactory object for a given cid/iid pair. to prepare your component code, you need to create a factory object for each object that you have registered with xpcom. the main function that must be implemented in the nsifactory interface is createinstance. the implementation follows a simple algorithm: create the raw object. if that fails, return an out of memory error code. call queryinterface on the new object. if that fails, null the out param and free the new object. return the nsresult value from queryinterface. often, you don't have to create the object first because the factory implicitly knows what iids are supported. when this is not the case, however, doing it this way further abstracts the factories from their concrete classes. if you have a fac...
...pported by the concrete base class, for example, then when you go to add a new supported interface you add this iid comparison in both the factory and the queryinterface implementation in the concrete class. ...
...ported interface you add this iid comparison in both the factory and the queryinterface implementation in the concrete class. ns_imethodimp samplefactory::createinstance(nsisupports *aouter, const nsiid & iid, void * *result) { if (!result) return ns_error_invalid_arg; sample* sample = new sample(); if (!sample) return ns_error_out_of_memory; nsresult rv = sample->queryinterface(iid, result); if (ns_failed(rv)) { *result = nsnull; delete sample; } return rv; } weblock1.cpp before any of the improvements and xpcom tools we describe in the following chapter are brought in, the source code for the weblock component that implements all the necessary interfaces looks like this. #include <stdio.h> #def...
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Debugger.Object - Firefox Developer Tools
this is that function’s script, as a debugger.script instance. if the referent is a function proxy or not debuggee code, this is undefined. environment if the referent is a function that is debuggee code, a debugger.environment instance representing the lexical environment enclosing the function when it was created. if the referent is a function proxy or not debuggee code, this is undefined. ...
...ebugger.script instance. if the referent is a function proxy or not debuggee code, this is undefined. environment if the referent is a function that is debuggee code, a debugger.environment instance representing the lexical environment enclosing the function when it was created. if the referent is a function proxy or not debuggee code, this is undefined. errormessagename if the referent is an error created with an engine internal message template this is a string which is the name of the template; undefined otherwise. errorlinenumber if the referent is an error object, this is the line number at which the referent was created; undefined otherwise. errorcolumnnumber if the referent is an error object, this is the column number at which the referent was created; undefined otherwise. isbo...
... promisestate if the referent is a promise, return a string indicating whether the promise is pending, or has been fulfilled or rejected. this string takes one of the following values: "pending", if the promise is pending. "fulfilled", if the promise has been fulfilled. "rejected", if the promise has been rejected. if the referent is not a promise, throw a typeerror. promisevalue return a debuggee value representing the value the promise has been fulfilled with. if the referent is not a promise, or the promise has not been fulfilled, throw a typeerror. promisereason return a debuggee value representing the value the promise has been rejected with. if the referent is not a promise, or the promise has not been rejected, throw a typeerror. pr...
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Debugger - Firefox Developer Tools
n in the debugger are not propagated to debuggee code; instead, spidermonkey calls this function, passingdebugger-exception as its sole argument and the debugger instance as the this value. this function should return a resumption value, which determines how the debuggee should continue. if the uncaught exception hook itself throws an exception,uncaught-hook-exception, spidermonkey throws a new error object,confess-to-debuggee-exception, to the debuggee whose message blames the debugger, and includes textual descriptions ofuncaught-hook-exception and the originaldebugger-exception. if uncaughtexceptionhook’s value is null, spidermonkey throws an exception to the debuggee whose message blames the debugger, and includes a textual description ofdebugger-exception. assigning anything other ...
... message blames the debugger, and includes textual descriptions ofuncaught-hook-exception and the originaldebugger-exception. if uncaughtexceptionhook’s value is null, spidermonkey throws an exception to the debuggee whose message blames the debugger, and includes a textual description ofdebugger-exception. ...
...is property throws a typeerror exception. (this is not an ideal way to handle debugger bugs, but the hope here is that some sort of backstop, even if imperfect, will make life easier for debugger developers. for example, an uncaught exception hook may have access to browser-level features like the alert function, which this api’s implementation does not, making it possible to present debugger errors to the developer in a way suited to the context.) debugger handler functions each debugger instance inherits accessor properties with which you can store handler functions for spidermonkey to call when given events occur in debuggee code. when one of the events described below occurs in debuggee code, the engine pauses the debuggee and calls the corresponding debugging handler on each debu...
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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. ...
...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 specific fields in the payment form. payer optional a payererrors compliant object which provides appropriate error messages for any of the fields describing the payer which failed validation. paymentmet...
...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 specific fields in the payment form. payer optional a payererrors compliant object which provides appropriate error messages for any of the fields describing the payer which failed validation. paymentmethod optional any payment method specific errors which may have occurred. this object's contents will vary depending on the payment used. for example, if the user chose to pay by credit card using the basic-card payment method, this is a basiccarderrors object. shippingaddress optional an addresserrors object which contains error messages for any of the fields in the shipping address that failed validation. return value a promise w...
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constructor - JavaScript
ovide your own constructor, then a default constructor will be supplied for you. ...
... constructor, then a default constructor will be supplied for you. ...
...nstructor() {} if your class is a derived class, the default constructor calls the parent constructor, passing along any arguments that were provided: constructor(...args) { super(...args); } that enables code like this to work: class validationerror extends error { printcustomermessage() { return `validation failed :-( (details: ${this.message})`; } } try { throw new validationerror("not a valid phone number"); } catch (error) { if (error instanceof validationerror) { console.log(error.name); // this is error instead of validationerror! console.log(error.printcustomermessage()); } else { console.log('unknown error', error); throw error; } } the validationerror class doesn't need an explicit constructor, because it doesn't need to do any custom initial...
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test/assert - Archive of obsolete content
ween 1 and '1'"); } // this test will pass, because the types are different exports["test strict equality"] = function(assert) { assert.notstrictequal(1, "1", "test strict equality between 1 and '1'"); } parameters actual : object the actual result. expected : object the expected result. message : string optional message to log, providing extra information about the test. throws(block, error, message) assert that a block of code throws the expected exception. this method takes an optional error argument: to check that the exception thrown is of the expected type, pass a constructor function: the exception thrown must be an instance of the object returned by that function. to check that the exception thrown contains a specific message, pass a regular expression here: the...
...wn is of the expected type, pass a constructor function: the exception thrown must be an instance of the object returned by that function. ...
... constructor function: the exception thrown must be an instance of the object returned by that function. ...
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Return Codes - Archive of obsolete content
e files were installed, but one or more components were in use. restart the computer and the application to complete the installation process. on windows nt, you may only need to restart the application as long as you did not replace operating system files. ...
... components were in use. restart the computer and the application to complete the installation process. on windows nt, you may only need to restart the application as long as you did not replace operating system files. bad_package_name -200 a problem occurred with the package name supplied to initinstall unexpected_error -201 an unrecognized error occurred. ...
...cation as long as you did not replace operating system files. bad_package_name -200 a problem occurred with the package name supplied to initinstall unexpected_error -201 an unrecognized error occurred. access_denied -202 the user (or the os) did not grant the required security privilege. execution_error -203 an error occurred executing the script no_install_script -204 installation script was not signed no_certificate -205 extracted file is not signed or the file (and, therefore, its certificate) could not be found. no_matching_certificate -206 extracted file was not signed by the certificate used to ...
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CSS and JavaScript accessibility best practices - Learn web development
be used to access it if javascript is not available (the default <video> browser controls aren't keyboard accessible in most browsers). as an example, we've written a quick and dirty client-side form validation example — see form-validation.html (also see the demo live). here you'll see a simple form; when you try to submit the form with one or both fields left empty, the submit fails, and an error message box appears to tell you what is wrong. this kind of form validation is unobtrusive — you can still use the form absolutely fine without the javascript being available, and any sensible form implementation will have server-side validation active as well, because it is too easy for malicious users to bypass client-side validation (for example, by turning javascript off in the browser). t...
...orm validation is unobtrusive — you can still use the form absolutely fine without the javascript being available, and any sensible form implementation will have server-side validation active as well, because it is too easy for malicious users to bypass client-side validation (for example, by turning javascript off in the browser). the client-side validation is still really useful for reporting errors — users can know about mistakes they make instantly, rather than having to wait for a round trip to the server and a page reload. this is a definite usability advantage. note: server-side validation has not been implemented in this simple demo. we've made this form validation pretty accessible too. we've used <label> elements to make sure the form labels are unambiguously linked to their i...
...re unambiguously linked to their inputs, so screen readers can read them out alongside: <label for="name">enter your name:</label> <input type="text" name="name" id="name"> we only do the validation when the form is submitted — this is so that we don't update the ui too often and potentially confuse screen reader (and possibly other) users: form.onsubmit = validate; function validate(e) { errorlist.innerhtml = ''; for(let i = 0; i < formitems.length; i++) { const testitem = formitems[i]; if(testitem.input.value === '') { errorfield.style.left = '360px'; createlink(testitem); } } if(errorlist.innerhtml !== '') { e.preventdefault(); } } note: in this example, we are hiding and showing the error message box using absolute positioning rather than anoth...
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Introduction to automated testing - Learn web development
f node and npm: node -v npm -v if you've got node/npm already installed, you should update them to their latest versions. to update node, the most reliable way is to download and install an updated installer package from their website (see link above). to update npm, use the following command in your terminal: npm install npm@latest -g note: if the above command fails with permissions errors, fixing npm permissions should sort you out. to start using node/npm-based packages on your projects, you need to set up your project directories as npm projects. this is easy to do. for example, let's first create a test directory to allow us to play without fear of breaking anything. create a new directory somewhere sensible using your file manager ui, or, on a command line, by navigatin...
...ning the actual code to run to complete the task. you can run your gulp task with the following commands — try this now: gulp adding some real tasks to gulp to add some real tasks to gulp, we need to think about what we want to do. a reasonable set of basic functionalities to run on our project is as follows: html-tidy, css-lint, and js-hint to lint and report/fix common html/css/js errors (see gulp-htmltidy, gulp-csslint, gulp-jshint). autoprefixer to scan our css and add vendor prefixes only where needed (see gulp-autoprefixer). babel to transpile any new javascript syntax features to traditional syntax that works in older browsers (see gulp-babel). see the links above for full instructions on the different gulp packages we are using. to use each plugin, you need to first i...
... .pipe(gulp.dest('build')); cb(); } here we are grabbing our development index.html file with gulp.src(), which allows us to grab a source file to do something with. we next use the pipe() function to pass that source to another command to do something else with. we can chain as many of these together as we want. we first run htmltidy() on the source, which goes through and fixes errors in our file. the second pipe() function writes the output html file to the build directory. in the input version of the file, you may have noticed that we put an empty <p> element; htmltidy has removed this by the time the output file has been created. autoprefixer and css-lint install using the following lines: npm install --save-dev gulp-autoprefixer npm install --save-dev gulp-csslint ...
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Promise
promises may also be created using the new promise() constructor. ...
... already have a reference. internally, a promise can be in one of three states: pending, when the final value is not available yet. this is the only state that may transition to one of the other two states. fulfilled, when and if the final value becomes available. a fulfillment value becomes permanently associated with the promise. this may be any value, including undefined. rejected, if an error prevented the final value from being determined. a rejection reason becomes permanently associated with the promise. this may be any value, including undefined, though it is generally an error object, like in exception handling. note: you should always handle, forward, or report errors (rejection reasons). if you see the message "a promise chain failed to handle a rejection", there is likely ...
... documentation conventions in documentation, the type of the fulfillment value is usually specified between angular brackets. ...
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Sqlite.jsm
many milliseconds of connection idle. the connection is idle when no statements are executing. there is no default value which means no automatic memory minimization will occur. please note that this is not a timer on the idle service and this could fire while the application is active. ...
...} working with opened connections opened connections are what you will interface most with in sqlite.jsm. the following sections detail the api of an opened connection instance. ...
...} working with opened connections opened connections are what you will interface most with in sqlite.jsm. the following sections detail the api of an opened connection instance. connection management these apis are used to manage and inspect the state of the connection. close() close this database connection. ...
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nsILocalFile
h appends a relative, native character encoding, path to the current path of the nsilocalfile object. void appendrelativenativepath( in acstring relativefilepath ); parameters relativefilepath a native relative path. for security reasons, this cannot contain '..' or cannot start with a directory separator '/'. must be in the native file system character set. exceptions thrown ns_error_file_unrecognized_path indicates that relativefilepath incorrectly begins with a path separator character or otherwise contains invalid characters. appendrelativepath() appends a relative native path to the current path of the nsilocalfile object. void appendrelativepath( in astring relativefilepath ); parameters relativefilepath a native relative path. for security reasons, this can...
...rator character or otherwise contains invalid characters. appendrelativepath() appends a relative native path to the current path of the nsilocalfile object. void appendrelativepath( in astring relativefilepath ); parameters relativefilepath a native relative path. for security reasons, this cannot contain '..' or cannot start with a directory separator '/' . exceptions thrown ns_error_file_unrecognized_path indicates that relativefilepath incorrectly begins with a path separator character or otherwise contains invalid characters. getrelativedescriptor() returns a relative file path in an opaque, cross platform format. it is therefore not a native path. acstring getrelativedescriptor( in nsilocalfile fromfile ); parameters fromfile the file from which the descripto...
... afile the file this becomes equivalent to. initwithnativepath() used to set the full path that this nsilocalfile references. all current settings will be reset. void initwithnativepath( in acstring filepath ); parameters filepath a string that specifies a platform-specific, full path to a file or directory. must be in the native file system character set. exceptions thrown ns_error_file_unrecognized_path indicates that filepath is not an absolute file path or that it contains characters that are invalid for the filesystem. initwithpath() used to set the full path that this nsilocalfile references. all current settings will be reset. void initwithpath( in astring filepath ); parameters filepath a string that specifies a platform-specific, full path to a file or ...
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Streams - Plugins
owser calls the npp_newstream method. this method also determines which mode it should use to send data to the plug-in. the browser can create a stream for several different types of data: for the file specified in the data attribute of the object element or the src attribute of the embed element for a data file for a full-page instance the npp_newstream method has the following syntax: nperror npp_newstream(npp instance, npmimetype type, npstream *stream, npbool seekable, uint16* stype); the instance parameter 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...
...wser deletes the npstream object. the plug-in can terminate the stream itself by calling npn_destroystream. you should delete any private data allocated in the plug-in's stream->pdata field when you destroy a stream. the plug-in can store private data associated with the stream in stream->pdata. the browser stores private data in stream->ndata; this value should not be changed by the plug-in. nperror npp_destroystream(npp instance, npstream *stream, nperror reason); the instance parameter is the current plug-in instance; the stream parameter specifies the stream to be deleted. the reason parameter specifies why the stream was destroyed. it can have one of these values: npres_done (most common): normal completion; all data was sent to the instance. npres_user_break: the user canceled t...
... it can have one of these values: npres_done (most common): normal completion; all data was sent to the instance. npres_user_break: the user canceled the stream directly by clicking the stop button or indirectly by some action, such as by deleting the instance or initiating higher-priority network operations. npres_network_err: the stream failed because of problems with the network, disk i/o error, lack of memory, or some other problem. finding out how much data the plug-in can accept after a call to npp_newstream and before writing data to the plug-in, the browser calls npp_writeready to determine the maximum number of bytes that the plug-in can consume. this function allows the browser to send only as much data to the instance as it can handle at one time, and it helps both the browse...
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Debugger.Script - Firefox Developer Tools
able or property. thus, we use a/b to refer to theb defined withina, and a< to refer to a function that occurs somewhere within an expression that is assigned toa. for example: function h() { var i = function() {}; // display name: h/i f(function () {}); // display name: h/< } var s = f(function () {}); // display name: s< if the instance refers to webassembly code, throw a typeerror. url if the instance refers to a jsscript, the filename or url from which this script’s code was loaded. for scripts created by eval or the function constructor, this may be a synthesized filename, starting with a valid url and followed by information tracking how the code was introduced into the system; the entire string is not a valid url. for function.prototype’s script, this is null...
...nction constructor, this may be a synthesized filename, starting with a valid url and followed by information tracking how the code was introduced into the system; the entire string is not a valid url. for function.prototype’s script, this is null. if this debugger.script’s source property is non-null, then this is equal to source.url. if the instance refers to webassembly code, throw a typeerror. startline if the instance refers to a jsscript, the number of the line at which this script’s code starts, within the file or document named by url. linecount if the instance refers to a jsscript, the number of lines this script’s code occupies, within the file or document named by url. source if the instance refers to a jsscript, the debugger.source instance representing the sourc...
...presenting the serialized text format of the webassembly code. sourcestart if the instance refers to a jsscript, the character within the debugger.source instance given by source at which this script’s code starts; zero-based. if this is a function’s script, this is the index of the start of the function token in the source code. if the instance refers to webassembly code, throw a typeerror. sourcelength if the instance refers to a jsscript, the length, in characters, of this script’s code within the debugger.source instance given by source. if the instance refers to webassembly code, throw a typeerror. global if the instance refers to a jsscript, a debugger.object instance referring to the global object in whose scope this script runs. the result refers to the globa...
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Console messages - Firefox Developer Tools
h message is displayed as a separate row: time the time the message was recorded. this is not shown by default: you can opt to see timestamps by selecting show timestamps in the console settings menu (gear icon in the console toolbar). icon not all console messages contain icons. ...
... filename and line number for javascript, css and console api messages, the message can be traced to a specific line of code. ...
...ying the url into the clipboard open in network panel switches context to the network tab, selects the request and shows you the details resend request sends the network request again. open url in new tab opens the url in a new browser tab. if the resource is an image, the image will be opened in a new tab. if the resource is a stylesheet, you will see the css rules, etc. ...
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FileSystemDirectoryEntry.getDirectory() - Web APIs
the filesystemdirectoryentry interface's method getdirectory() returns a filesystemdirectoryentry object corresponding to a directory contained somewhere within the directory subtree rooted at the directory on which it's called. syntax filesystemdirectoryentry.getdirectory([path][, options][, successcallback][, errorcallback]); parameters path optional a usvstring representing an absolute path or a path relative to the directory on which the method is called, describing which directory entry to return. absolute paths may not be able to be used, for security reasons. options optional an object based on the filesystemflags dictionary, which allows you to specify whether or not to create the entry if it's missing and if it's an error if the file already exists. these options are curren...
...ich allows you to specify whether or not to create the entry if it's missing and if it's an error if the file already exists. these options are currently not useful in web contexts. successcallback optional a method to be called once the filesystemdirectoryentry has been created. the method receives a single parameter: the filesystemdirectoryentry object representing the directory in question. errorcallback optional a method to be called if an error occurs. receives as its sole input parameter a fileerror object describing the error which occurred. return value undefined. ...
...esscallback optional a method to be called once the filesystemdirectoryentry has been created. the method receives a single parameter: the filesystemdirectoryentry object representing the directory in question. errorcallback optional a method to be called if an error occurs. receives as its sole input parameter a fileerror object describing the error which occurred. return value undefined. errors if an error occurs and an errorcallback was specified, it gets called with a single parameter: a fileerror object describing the error. ...
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FileSystemDirectoryEntry.getFile() - Web APIs
} the filesystemdirectoryentry interface's method getfile() returns a filesystemfileentry object corresponding to a file contained somewhere within the directory subtree rooted at the directory on which it's called. syntax filesystemdirectoryentry.getfile([path][, options][, successcallback][, errorcallback]); parameters path optional a usvstring specifying the path, relative to the directory on which the method is called, describing which file's entry to return. options optional an object based on the filesystemflags dictionary, which allows you to specify whether or not to create the entry if it's missing and if it's an error if the file already exists. these options are currently not useful in web contexts. successcallback optional a method to be called once the filesystemfileen...
... dictionary, which allows you to specify whether or not to create the entry if it's missing and if it's an error if the file already exists. these options are currently not useful in web contexts. successcallback optional a method to be called once the filesystemfileentry has been created. the method receives a single parameter: the filesystemfileentry object representing the file in question. errorcallback optional a method to be called if an error occurs. receives as its sole input parameter a fileerror object describing the error which occurred. return value undefined. ...
...contexts. successcallback optional a method to be called once the filesystemfileentry has been created. the method receives a single parameter: the filesystemfileentry object representing the file in question. errorcallback optional a method to be called if an error occurs. receives as its sole input parameter a fileerror object describing the error which occurred. return value undefined. errors if an error occurs and an errorcallback was specified, it gets called with a single parameter: a fileerror object describing the error. ...
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FileSystemDirectoryEntry.removeRecursively() - Web APIs
the filesystemdirectoryentry interface's method removerecursively() removes the directory as well as all of its content, hierarchically iterating over its entire subtree of descendant files and directories. to remove a single file, or an empty directory, you can also use filesystementry.remove(). ...
... hierarchically iterating over its entire subtree of descendant files and directories. to remove a single file, or an empty directory, you can also use filesystementry.remove(). syntax filesystemdirectoryentry.removerecursively(successcallback[, errorcallback]); parameters successcallback a function to call once the directory removal process has completed. the callback has no parameters. errorcallback optional a function to be called if an error occurs while attempting to remove the directory subtree. ...
...ry, you can also use filesystementry.remove(). syntax filesystemdirectoryentry.removerecursively(successcallback[, errorcallback]); parameters successcallback a function to call once the directory removal process has completed. the callback has no parameters. errorcallback optional a function to be called if an error occurs while attempting to remove the directory subtree. receives a fileerror describing the error which occurred as input. return value undefined. errors if an error occurs and an errorcallback was specified, it gets called with a single parameter: a fileerror object describing the error. ...
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Capabilities, constraints, and settings - Web APIs
code needs to know whether or not an api exists and if so, what its limitations are on the user agent it's running on. figuring this out has often been difficult, and has usually involved looking at some combination of which user agent (or browser) you're running on, which version it is, looking to see if certain objects exist, trying to see whether various things work or not and determining what errors occur, and so forth. the result has been a lot of very fragile code, or a reliance on libraries which figure this stuff out for you, then implement polyfills to patch the holes in the implementation on your behalf. the twin concepts of constraints and capabilities let the browser and web site or app exchange information about what constrainable properties the browser's implementation supports a...
...e within the range, if you choose. if you provide an ideal value, the browser will try to get as close as possible to matching that value, given the other constraints specified. let supports = navigator.mediadevices.getsupportedconstraints(); if (!supports["width"] || !supports["height"] || !supports["framerate"] || !supports["facingmode"]) { // we're missing needed properties, so handle that error. } else { let constraints = { width: { min: 640, ideal: 1920, max: 1920 }, height: { min: 400, ideal: 1080 }, aspectratio: 1.777777778, framerate: { max: 30 }, facingmode: { exact: "user" } }; mytrack.applyconstraints(constraints).then(function() => { /* do stuff if constraints applied successfully */ }).catch(function(reason) { /* failed to apply constraints;...
... you can specify one or more media input device ids to establish restrictions on which input sources are allowed. to collect a list of the available devices, you can call navigator.mediadevices.enumeratedevices(), then for each device which meets the desired crite...
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PaymentRequest.show() - Web APIs
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, 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 a...
...ating 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 that eventually resolves with a paymentresponse. the promise is resolved when the user accepts the payment request (such as by clicking a "pay" button in the browser's payment sheet). ...
...to interact with it. the promise should resolve with a paymentdetailsupdate object containing the updated information. return value a promise that eventually resolves with a paymentresponse. the promise is resolved when the user accepts the payment request (such as by clicking a "pay" button in the browser's payment sheet). ...
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Sensor APIs - Web APIs
in window) { // watch out! } if (window.ambientlightsensor) { // go dark... } defensive programming as stated in feature detection, checking for a particular sensor api is insufficient for feature detection. the existence of an actual sensor must be confirmed as well. this is where defensive programming is needed. defensive programming requires three strategies. checking for thrown errors when instantiating a sensor object. listening for errors thrown during its use. handling the errors gracefully so that the user experience is enhanced rather than degraded. the code example below illustrates these principles. the try...catch block catches errors thrown during sensor instantiation. it implements a handler for sensor.onerror to catch errors thrown during use. the only time any...
...t supported by the device. if a feature policy blocks use of a feature it is because your code is inconsistent with the policies set on your server. this is not something that would ever be shown to a user. see feature-policy for implementation instructions. ...
...icy blocks use of a feature it is because your code is inconsistent with the policies set on your server. this is not something that would ever be shown to a user. see feature-policy for implementation instructions. let accelerometer = null; try { accelerometer = new accelerometer({ referenceframe: 'device' }); accelerometer.addeventlistener('error', event => { // handle runtime errors. ...
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Web APIs
wport wweb animationsweb audio apiweb authentication apiweb crypto apiweb notificationsweb storage apiweb workers apiwebglwebrtcwebvttwebxr device apiwebsockets api interfaces this is a list of all the interfaces (that is, types of objects) that are available. ...
...e client clients clipboard clipboardevent clipboarditem closeevent comment compositionevent constantsourcenode constrainboolean constraindomstring constraindouble constrainulong contentindex contentindexevent convolvernode countqueuingstrategy crashreportbody credential credentialscontainer crypto cryptokey cryptokeypair customelementregistry customevent d domconfiguration domerror domexception domhighrestimestamp domimplementation domimplementationlist domlocator dommatrix dommatrixreadonly domobject domparser dompoint dompointinit dompointreadonly domquad domrect domrectreadonly domstring domstringlist domstringmap domtimestamp domtokenlist domuserdata datatransfer datatransferitem datatransferitemlist dedicatedworkerglobalscope delaynode deprecationreportbo...
...dynamicscompressornode e ext_blend_minmax ext_color_buffer_float ext_color_buffer_half_float ext_disjoint_timer_query ext_float_blend ext_frag_depth ext_srgb ext_shader_texture_lod ext_texture_compression_bptc ext_texture_compression_rgtc 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 filesystems...
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HTTP response status codes - HTTP
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. ...
... 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. ...
...quest. 308 permanent redirect this means that the resource is now permanently located at another uri, specified by the location: http response header. this has the same semantics as the 301 moved permanently http response code, with the exception that the user agent must not change the http method used: if a post was used in the first request, a post must be used in the second request. client error responses 400 bad request the server could not understand the request due to invalid syntax. 401 unauthorized although the http standard specifies "unauthorized", semantically this response means "unauthenticated". that is, the client must authenticate itself to get the requested response. 402 payment required this response code is reserved for future use. the initial aim for creating t...
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Promise.prototype.then() - JavaScript
success and failure cases of the promise. the source for this interactive demo is stored in a github repository. if you'd like to contribute to the interactive demo project, please clone https://github.com/mdn/interactive-examples and send us a pull request. if one or both arguments are omitted or are provided non-functions, then then will be missing the handler(s), but will not generate any errors. if the promise that then is called on adopts a state (fulfillment or rejection) for which then has no handler, the returned promise simply adopts the final state of the original promise on which then was called. syntax p.then(onfulfilled[, onrejected]); p.then(value => { // fulfillment }, reason => { // rejection }); parameters onfulfilled optional a function called if the promise...
...se is fulfilled. this function has one argument, the fulfillment value. if it is not a function, it is internally replaced with an "identity" function (it returns the received argument). onrejected optional a function called if the promise is rejected. this function has one argument, the rejection reason. if it is not a function, it is internally replaced with a "thrower" function (it throws an error it received as argument). return value once a promise is fulfilled or rejected, the respective handler function (onfulfilled or onrejected) will be called asynchronously (scheduled in the current thread loop). the behavior of the handler function follows a specific set of rules. if a handler function: returns a value, the promise returned by then gets resolved with the returned value as its...
...on (onfulfilled or onrejected) will be called asynchronously (scheduled in the current thread loop). the behavior of the handler function follows a specific set of rules. if a handler function: returns a value, the promise returned by then gets resolved with the returned value as its value. doesn't return anything, the promise returned by then gets resolved with an undefined value. throws an error, the promise returned by then gets rejected with the thrown error as its value. returns an already fulfilled promise, the promise returned by then gets fulfilled with that promise's value as its value. returns an already rejected promise, the promise returned by then gets rejected with that promise's value as its value. returns another pending promise object, the resolution/rejection of the pr...
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