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FormDataEvent.formData - Web APIs
the formdata read only property of the formdataevent interface contains the formdata object representing the data contained in the form when the event was fired.
... syntax formdata = formdataevent.formdata returns a formdata object.
... examples // grab reference to form const formelem = document.queryselector('form'); // submit handler formelem.addeventlistener('submit', (e) => { // on form submission, prevent default e.preventdefault(); // construct a formdata object, which fires the formdata event new formdata(formelem); }); // formdata handler to retrieve data formelem.addeventlistener('formdata', (e) => { console.log('formdata fired'); // get the form data from the event object let data = e.formdata; for (var value of data.values()) { console.log(value); } // submit the data via xhr var request = new xmlhttprequest(); request.open("post", "/formhandler"); request.send(data); }); specifications specification status comment html living standardthe definition of...
... 'formdata' in that specification.
Using FormData Objects - Web APIs
the formdata object lets you compile a set of key/value pairs to send using xmlhttprequest.
... creating a formdata object from scratch you can build a formdata object yourself, instantiating it then appending fields to it by calling its append() method, like this: var formdata = new formdata(); formdata.append("username", "groucho"); formdata.append("accountnum", 123456); // number 123456 is immediately converted to a string "123456" // html file input, chosen by user formdata.append("userfile", fileinputelement.files[0]); // javascript file-like object var content = '<a id="a"><b id="b">hey!</b><...
...var blob = new blob([content], { type: "text/xml"}); formdata.append("webmasterfile", blob); var request = new xmlhttprequest(); request.open("post", "http://foo.com/submitform.php"); request.send(formdata); note: the fields "userfile" and "webmasterfile" both contain a file.
...And 13 more matches
FormData - Web APIs
WebAPIFormData
the formdata interface provides a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using the xmlhttprequest.send() method.
... an object implementing formdata can directly be used in a for...of structure, instead of entries(): for (var p of myformdata) is equivalent to for (var p of myformdata.entries()).
... constructor formdata() creates a new formdata object.
...And 11 more matches
FormData.append() - Web APIs
WebAPIFormDataappend
the append() method of the formdata interface appends a new value onto an existing key inside a formdata object, or adds the key if it does not already exist.
... the difference between formdata.set and append() is that if the specified key already exists, formdata.set will overwrite all existing values with the new one, whereas append() will append the new value onto the end of the existing set of values.
... syntax there are two versions of this method: a two and a three parameter version: formdata.append(name, value); formdata.append(name, value, filename); parameters name the name of the field whose data is contained in value.
...And 4 more matches
FormDataEvent - Web APIs
the formdataevent interface represents a formdata event — such an event is fired on an htmlformelement object after the entry list representing the form's data is constructed.
... this happens when the form is submitted, but can also be triggered by the invocation of a formdata() constructor.
... this allows a formdata object to be quickly obtained in response to a formdata event firing, rather than needing to put it together yourself when you wish to submit form data via a method like xmlhttprequest (see using formdata objects).
...And 4 more matches
Body.formData() - Web APIs
WebAPIBodyformData
the formdata() method of the body mixin takes a response stream and reads it to completion.
... it returns a promise that resolves with a formdata object.
...if a user submits a form and a service worker intercepts the request, you could for example call formdata() on it to obtain a key-value map, modify some fields, then send the form onwards to the server (or use it locally).
...And 3 more matches
GlobalEventHandlers.onformdata - Web APIs
the onformdata property of the globaleventhandlers mixin is the eventhandler for processing formdata events, fired after the entry list representing the form's data is constructed.
... this happens when the form is submitted, but can also be triggered by the invocation of a formdata() constructor.
... onformdata is available on htmlformelement.
...And 3 more matches
FormData() - Web APIs
WebAPIFormDataFormData
the formdata() constructor creates a new formdata object.
... syntax var formdata = new formdata(form) parameters form optional an html <form> element — when specified, the formdata object will be populated with the form's current keys/values using the name property of each element for the keys and their submitted value for the values.
... example the following line creates an empty formdata object: var formdata = new formdata(); // currently empty you could add a key/value pair to this using formdata.append: formdata.append('username', 'chris'); or you can specify the optional form argument when creating the formdata object, to prepopulate it with values from the specified form: <form id="myform" name="myform"> <div> <label for="username">enter name:</label> <input type="text" id="username" name="username"> </div> <div> <label for="useracc">enter account number:</label> <input type="text" id="useracc" name="useracc"> </div> <div> <label for="userfile">upload file:</label> <input type="file" id="userfile" name="userfile"> </div> <input type="subm...
...And 2 more matches
FormData.set() - Web APIs
WebAPIFormDataset
the set() method of the formdata interface sets a new value for an existing key inside a formdata object, or adds the key/value if it does not already exist.
... the difference between set() and formdata.append is that if the specified key does already exist, set() will overwrite all existing values with the new one, whereas formdata.append will append the new value onto the end of the existing set of values.
... syntax there are two versions of this method: a two and a three parameter version: formdata.set(name, value); formdata.set(name, value, filename); parameters name the name of the field whose data is contained in value.
...And 2 more matches
FormDataEvent() - Web APIs
the formdataevent() constructor creates a new formdataevent object instance.
... syntax new formdataevent(type[, formeventinit]); values type a domstring representing the name of the event.
... formdata: a formdata object to pre-populate the formdataevent with.
...And 2 more matches
FormData.get() - Web APIs
WebAPIFormDataget
the get() method of the formdata interface returns the first value associated with a given key from within a formdata object.
... syntax formdata.get(name); parameters name a usvstring representing the name of the key you want to retrieve.
... return value a formdataentryvalue containing the value.
... example the following line creates an empty formdata object: var formdata = new formdata(); if we add two username values using formdata.append: formdata.append('username', 'chris'); formdata.append('username', 'bob'); the following get() function will only return the first username value appended: formdata.get('username'); // returns "chris" specifications specification status comment xmlhttprequestthe definition of 'get()' in that specification.
FormData.getAll() - Web APIs
WebAPIFormDatagetAll
the getall() method of the formdata interface returns all the values associated with a given key from within a formdata object.
... syntax formdata.getall(name); parameters name a usvstring representing the name of the key you want to retrieve.
... returns an array of formdataentryvalues whose key matches the value passed in the name parameter.
... example the following line creates an empty formdata object: var formdata = new formdata(); if we add two username values using formdata.append: formdata.append('username', 'chris'); formdata.append('username', 'bob'); the following getall() function will return both username values in an array: formdata.getall('username'); // returns ["chris", "bob"] specifications specification status comment xmlhttprequestthe definition of 'getall()' in that specification.
FormDataEntryValue - Web APIs
a string or file that represents a single value from a set of formdata key-value pairs.
... this type is returned by the formdata.get() and formdata.getall() methods.
... the formdata.get() method returns a single value while formdata.getall() returns an array of formdataentryvalues.
... note that the formdata.append() and formdata.set() methods allow passing a blob value, which is converted to a file in the process.
HTMLFormElement: formdata event - Web APIs
the formdata event fires after the entry list representing the form's data is constructed.
... this happens when the form is submitted, but can also be triggered by the invocation of a formdata() constructor.
... general info bubbles no cancelable no interface formdataevent event handler property globaleventhandlers.onformdata examples // grab reference to form const formelem = document.queryselector('form'); // submit handler formelem.addeventlistener('submit', (e) => { // on form submission, prevent default e.preventdefault(); // construct a formdata object, which fires the formdata event new formdata(formelem); }); // formdata handler to retrieve data formelem.addeventlistener('formdata', (e) => { console.log('formdata fired'); // get the form data from the event object let data = e.formdata; for (var value of data.values()) { console.log(value); } // submit the data via xhr var request = new xmlhttprequest(); ...
... request.open("post", "/formhandler"); request.send(data); }); the onformdata version would look like this: formelem.onformdata = (e) => { console.log('formdata fired'); // get the form data from the event object let data = e.formdata; for (var value of data.values()) { console.log(value); } // submit the data via xhr var request = new xmlhttprequest(); request.open("post", "/formhandler"); request.send(data); }; specifications specification status comment html living standardthe definition of 'formdata' in that specification.
TPS Formdata Lists
a formdata asset list is an array of objects, each with the following properties: fieldname: required.
... for example: var formdata1 = [ { fieldname: "testing", value: "success", date: -1 }, { fieldname: "testing", value: "failure", date: -2 }, { fieldname: "username", value: "joe" } ]; formdata lists and phase actions you can use the following functions in phase actions for formdata lists: formdata.add formdata.delete formdata.verify formdata.verifynot for an example, see the tps formdata unittest: http://hg.mozilla.org/services/tps/f...st_formdata.js notes note 1, tps supports the delete action for formdata, but sync currently does not correctly sync deleted form data, see bug 564296.
... note 2, sync currently does not sync formdata dates, so the date field is ignored when performing verify and verify-not actions.
FormData.delete() - Web APIs
WebAPIFormDatadelete
the delete() method of the formdata interface deletes a key and its value(s) from a formdata object.
... syntax formdata.delete(name); parameters name the name of the key you want to delete.
... example the following line creates an empty formdata object and prepopulates it with key/value pairs from a form: var formdata = new formdata(myform); you can delete keys and their values using delete(): formdata.delete('username'); specifications specification status comment xmlhttprequestthe definition of 'delete()' in that specification.
FormData.entries() - Web APIs
WebAPIFormDataentries
the formdata.entries() method returns an iterator allowing to go through all key/value pairs contained in this object.
... syntax formdata.entries(); return value returns an iterator.
... example // create a test formdata object var formdata = new formdata(); formdata.append('key1', 'value1'); formdata.append('key2', 'value2'); // display the key/value pairs for(var pair of formdata.entries()) { console.log(pair[0]+ ', '+ pair[1]); } the result is: key1, value1 key2, value2 specifications specification status comment xmlhttprequestthe definition of 'entries() (as iterator<>)' in that specification.
FormData.has() - Web APIs
WebAPIFormDatahas
the has() method of the formdata interface returns a boolean stating whether a formdata object contains a certain key.
... syntax formdata.has(name); parameters name a usvstring representing the name of the key you want to test for.
... example the following line creates an empty formdata object: var formdata = new formdata(); the following snippet shows the results of testing for the existence of username in the formdata object, before and after appending a username value to it with formdata.append: formdata.has('username'); // returns false formdata.append('username', 'chris'); formdata.has('username'); // returns true specifications specification status comment xmlhttprequestthe definition of 'has()' in that specification.
FormData.keys() - Web APIs
WebAPIFormDatakeys
the formdata.keys() method returns an iterator allowing to go through all keys contained in this object.
... syntax formdata.keys(); return value returns an iterator.
... example // create a test formdata object var formdata = new formdata(); formdata.append('key1', 'value1'); formdata.append('key2', 'value2'); // display the keys for (var key of formdata.keys()) { console.log(key); } the result is: key1 key2 specifications specification status comment xmlhttprequestthe definition of 'keys() (as iterator<>)' in that specification.
FormData.values() - Web APIs
WebAPIFormDatavalues
the formdata.values() method returns an iterator allowing to go through all values contained in this object.
... syntax formdata.values(); return value returns an iterator.
... example // create a test formdata object var formdata = new formdata(); formdata.append('key1', 'value1'); formdata.append('key2', 'value2'); // display the values for (var value of formdata.values()) { console.log(value); } the result is: value1 value2 specifications specification status comment xmlhttprequestthe definition of 'values() (as iterator<>)' in that specification.
Index - Web APIs
WebAPIIndex
359 body.formdata() api, body, experimental, fetch, fetch api, formdata, method, needsexample, reference the formdata() method of the body mixin takes a response stream and reads it to completion.
... it returns a promise that resolves with a formdata object.
... 1414 formdata api, formdata, interface, reference, xmlhttprequest the formdata interface provides a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using the xmlhttprequest.send() method.
...And 13 more matches
Sending forms through JavaScript - Learn web development
using a standalone formdata object.
... using formdata bound to a <form> element.
... using xmlhttprequest and the formdata object building an http request by hand can be overwhelming.
...And 11 more matches
Using XMLHttpRequest - Web APIs
submitting forms and uploading files instances of xmlhttprequest can be used to submit forms in two ways: using only ajax using the formdata api using the formdata api is the simplest and fastest, but has the disadvantage that data collected can not be stringified.
... using nothing but xmlhttprequest submitting forms without the formdata api does not require other apis for most use cases.
...if you do not intend to upload binary content, consider instead using the formdata api.
...And 9 more matches
Using Fetch - Web APIs
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', { method: 'put', body: formdata }) .then(response => response.json()) .then(result => { console.log('success:', result); }) .catch(error => { console.error('error:', error); }); uploading multiple files files can be uploaded using an html <input type="file" multiple /> input element, formdata() and fetch().
... const formdata = new formdata(); const photos = document.queryselector('input[type="file"][multiple]'); formdata.append('title', 'my vegas vacation'); for (let i = 0; i < photos.files.length; i++) { formdata.append('photos', photos.files[i]); } fetch('https://example.com/posts', { method: 'post', body: formdata, }) .then(response => response.json()) .then(result => { console.log('success:', result); }) .catch(error => { console.error('error:', error); }); processing a text file line by line the chunks that are read from a response are not broken neatly at line boundaries and are uint8arrays, not strings.
...And 3 more matches
PasswordCredential.additionalData - Web APIs
the additionaldata property of the passwordcredential interface takes one of a formdata instance, a urlsearchparams instance, or null.
... syntax passwordcredential.additionaldata = formdata formdata = passwordcredential.additionaldata passwordcredential.additionaldata = urlsearchparams ulrsearchparams = passwordcredential.additionaldata value one of a formdata instance, a urlsearchparams instance, or null.
... example the following example creates a formdata object with an appended csrf token.
...navigator.credentials.get(options).then(function(creds) { if (creds.type == 'password') { var form = new formdata(); var csrf_token = document.queryselector('csrf_token').value; form.append('csrf_token', csrf_token); creds.additionaldata = form; fetch('https://www.example.com', { method: 'post', credentials: creds }); }; }); specifications specification status comment credential management level 1 working draft initial definition.
Promises - Archive of obsolete content
let form = new formdata; form.append("id", data.id); form.append("content", data.content); // make the second request.
... let form = new formdata; form.append("id", data.id); form.append("content", data.content); // make the second request.
...ions.method || defaultmethod, url); if (options.responsetype) xhr.responsetype = options.responsetype; for (let header of object.keys(options.headers || {})) xhr.setrequestheader(header, options.headers[header]); let data = options.data; if (data && object.getprototypeof(data).constructor.name == "object") { options.data = new formdata; for (let key of object.keys(data)) options.data.append(key, data[key]); } xhr.send(options.data); }); } example usage: task.spawn(function* () { let request = yield request("http://example.com/", { method: "put", mimetype: "application/json", headers: { "x-species": "hobbit" }, data: { ...
Uploading and Downloading Files - Archive of obsolete content
this is a common technique for uploading files as it is compatible with existing servers and formdata interface makes that task fairly simple.
... a formdata object will automatically generate request data with mime type multipart/form-data that existing servers can process.
...the formdata object can then simply be passed to xmlhttprequest: function upload(posturl, fieldname, filepath) { var formdata = new formdata(); formdata.append(fieldname, new file(filepath)); var req = new xmlhttprequest(); req.open("post", posturl); req.onload = function(event) { alert(event.target.responsetext); }; req.send(formdata); } http put you can also upload a file using an http put operation.
Beacon API - Web APIs
the data argument is optional and its type may be an arraybufferview, blob, domstring, or formdata.
...the data argument is optional and its type may be an arraybufferview, blob, domstring, or formdata.
Body - Web APIs
WebAPIBody
body.formdata() takes a response stream and reads it to completion.
... it returns a promise that resolves with a formdata object.
HTMLFormElement - Web APIs
formdata the formdata event fires after the entry list representing the form's data is constructed.
... also available via the onformdata property.
Request - Web APIs
WebAPIRequest
body.formdata() returns a promise that resolves with a formdata representation of the request body.
...ng the request() constructor with some initial data and body content for an api request which need a body payload: const request = new request('https://example.com', {method: 'post', body: '{"foo": "bar"}'}); const url = request.url; const method = request.method; const credentials = request.credentials; const bodyused = request.bodyused; note: the body type can only be a blob, buffersource, formdata, urlsearchparams, usvstring or readablestream type, so for adding a json object to the payload you need to stringify that object.
Response - Web APIs
WebAPIResponse
body.formdata() takes a response stream and reads it to completion.
... it returns a promise that resolves with a formdata object.
Web forms — Working with user data - Learn web development
(see also using formdata objects.) css property compatibility table for form controls this last article provides a handy reference allowing you to look up what css properties are compatible with what form elements.
Using the Beacon API - Web APIs
the data argument is optional and its type may be an arraybufferview, blob, domstring, or formdata.
Document - Web APIs
WebAPIDocument
globaleventhandlers.onformdata is an eventhandler for processing formdata events, fired after the entry list representing the form's data is constructed.
Using files from web applications - Web APIs
$_files['myfile']['name']); exit; } ?><!doctype html> <html> <head> <title>dnd binary upload</title> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <script type="application/javascript"> function sendfile(file) { const uri = "/index.php"; const xhr = new xmlhttprequest(); const fd = new formdata(); xhr.open("post", uri, true); xhr.onreadystatechange = function() { if (xhr.readystate == 4 && xhr.status == 200) { alert(xhr.responsetext); // handle response.
GlobalEventHandlers - Web APIs
globaleventhandlers.onformdata is an eventhandler for processing formdata events, fired after the entry list representing the form's data is constructed.
The HTML DOM API - Web APIs
formdataevent htmlformcontrolscollection htmloptionscollection radionodelist validitystate canvas and image interfaces these interfaces represent objects used by the canvas api as well as the <img> element and <picture> elements.
Navigator.sendBeacon() - Web APIs
data a arraybuffer, arraybufferview, blob, domstring, formdata, or urlsearchparams object containing the data to send.
PasswordCredential - Web APIs
passwordcredential.additionaldata secure context one of a formdata instance, a urlsearchparams instance, or null.
Request() - Web APIs
WebAPIRequestRequest
body: any body that you want to add to your request: this can be a blob, buffersource, formdata, urlsearchparams, usvstring, or readablestream object.
Response() - Web APIs
WebAPIResponseResponse
this can be null (which is the default value), or one of: blob buffersource formdata readablestream urlsearchparams usvstring init optional an options object containing any custom settings that you want to apply to the response, or an empty object (which is the default value).
Functions and classes available to Web Workers - Web APIs
8 (8) no support no support no support formdata formdata objects provide a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using the xmlhttprequest send() method.
WindowOrWorkerGlobalScope.fetch() - Web APIs
body any body that you want to add to your request: this can be a blob, buffersource, formdata, urlsearchparams, usvstring, or readablestream object.
XMLHttpRequest.send() - Web APIs
an xmlhttprequestbodyinit, which per the fetch spec can be a blob, buffersource, formdata, urlsearchparams, or usvstring object.
Web APIs
WebAPI
vent extendablemessageevent f featurepolicy federatedcredential fetchevent file fileentrysync fileerror fileexception filelist filereader filereadersync filerequest filesystem filesystemdirectoryentry filesystemdirectoryreader filesystementry filesystementrysync filesystemfileentry filesystemflags filesystemsync focusevent fontface fontfaceset fontfacesetloadevent formdata formdataentryvalue formdataevent fullscreenoptions g gainnode gamepad gamepadbutton gamepadevent gamepadhapticactuator geolocation geolocationcoordinates geolocationposition geolocationpositionerror geometryutils gestureevent globaleventhandlers gyroscope h htmlanchorelement htmlareaelement htmlaudioelement htmlbrelement htmlbaseelement htmlbasefontelement htmlbodyelement htmlbuttonel...
Basic form hints - Accessibility
put type="text" value="phone" id="phone" aria-required="false"/> </div> <div> <label for="email">* e-mail:</label> <input type="text" value="email" id="email" aria-required="true"/> </div> </form> the script that validates the form entry would look something like this: var validate = function () { var emailelement = document.getelementbyid(emailfieldid); var valid = emailvalid(formdata.email); // returns true if valid, false otherwise emailelement.setattribute("aria-invalid", !valid); setelementbordercolour(emailelement, valid); // sets the border to red if second arg is false }; providing helpful error messages read how to use aria alerts to enhance forms.
Ajax - Developer guides
WebGuideAJAX
this article will explain how to use some ajax techniques, like: analyzing and manipulating the response of the server monitoring the progress of a request submitting forms and upload binary files – in pure ajax, or using formdata objects using ajax within web workers fetch api the fetch api provides an interface for fetching resources.
Developer guides
using formdata objects the formdata object lets you compile a set of key/value pairs to send using xmlhttprequest.
<input type="image"> - HTML: Hypertext Markup Language
WebHTMLElementinputimage
multipart/form-data uses the formdata api to manage the data, allowing for files to be submitted to the server.
<input type="radio"> - HTML: Hypertext Markup Language
WebHTMLElementinputradio
mail</label> </div> <div> <button type="submit">submit</button> </div> </form> <pre id="log"> </pre> then we add some javascript to set up an event listener on the submit event, which is sent when the user clicks the "submit" button: var form = document.queryselector("form"); var log = document.queryselector("#log"); form.addeventlistener("submit", function(event) { var data = new formdata(form); var output = ""; for (const entry of data) { output = output + entry[0] + "=" + entry[1] + "\r"; }; log.innertext = output; event.preventdefault(); }, false); try this example out and see how there's never more than one result for the contact group.
<input type="submit"> - HTML: Hypertext Markup Language
WebHTMLElementinputsubmit
multipart/form-data uses the formdata api to manage the data, allowing for files to be submitted to the server.
MIME types (IANA media types) - HTTP
examples include multipart/form-data (for data produced using the formdata api) and multipart/byteranges (defined in rfc 7233: 5.4.1 and used with http's 206 "partial content" response returned when the fetched data is only part of the content, such as is delivered using the range header).
Using Promises - JavaScript
sable compose function, which is common in functional programming: const applyasync = (acc,val) => acc.then(val); const composeasync = (...funcs) => x => funcs.reduce(applyasync, promise.resolve(x)); the composeasync() function will accept any number of functions as arguments, and will return a new function that accepts an initial value to be passed through the composition pipeline: const transformdata = composeasync(func1, func2, func3); const result3 = transformdata(data); in ecmascript 2017, sequential composition can be done more simply with async/await: let result; for (const f of [func1, func2, func3]) { result = await f(result); } /* use last result (i.e.