FormDataEvent: formData property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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.

Value

A FormData object.

Examples

js
// 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 (const value of data.values()) {
    console.log(value);
  }

  // submit the data via XHR
  const request = new XMLHttpRequest();
  request.open("POST", "/formHandler");
  request.send(data);
});

Specifications

Specification
HTML Standard
# the-formdataevent-interface:dom-formdataevent-formdata-2

Browser compatibility

BCD tables only load in the browser

See also