NavigateEvent: formData property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The formData read-only property of the NavigateEvent interface returns the FormData object representing the submitted data in the case of a POST form submission, or null otherwise.

Value

A FormData object, or null.

Examples

js
navigation.addEventListener("navigate", (event) => {
  // Some navigations, e.g. cross-origin navigations, we
  // cannot intercept. Let the browser handle those normally.
  if (!event.canIntercept) {
    return;
  }

  // Don't intercept fragment navigations or downloads.
  if (event.hashChange || event.downloadRequest !== null) {
    return;
  }

  event.intercept({
    handler() {
      if (event.formData) {
        processFormDataAndUpdateUI(event.formData, event.signal);
      } else {
        doSinglePageAppNav(event.destination, event.signal);
      }
    },
  });
});

Specifications

Specification
HTML
# dom-navigateevent-formdata-dev

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
formData
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also