The FormDataEvent() constructor creates a new FormDataEvent object instance.


new FormDataEvent(type[, formEventInit]);


A DOMString representing the name of the event.
formEventInit Optional
A FormEventInit dictionary, which can take the following optional fields:
  • bubbles: a Boolean indicating whether the event bubbles. The default is false.
  • cancelable: a Boolean indicating whether the event can be cancelled. The default is false.
  • composed: a Boolean indicating whether the event will trigger listeners outside of a shadow root (see Event.composed for more details). The default is false.
  • formData: A FormData object to pre-populate the FormDataEvent with. This would then be accessed through the FormDataEvent.formData property.


let fd = new FormData();
fd.append('test', 'test');

let fdEv = new FormDataEvent('formdata', { formData: fd });

for (let value of fdEv.formData.values()) {


Specification Status Comment
HTML Living Standard
The definition of 'FormDataEvent' in that specification.
Living Standard Initial definition

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
FormDataEvent() constructorChrome Full support 77Edge Full support 79Firefox Full support 72IE No support NoOpera Full support 64Safari No support NoWebView Android Full support 77Chrome Android Full support 77Firefox Android No support NoOpera Android Full support 55Safari iOS No support NoSamsung Internet Android Full support 12.0


Full support
Full support
No support
No support

See also