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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/formdata_event below:

HTMLFormElement: formdata event - Web APIs

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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.

This event is not cancelable and does not bubble.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("formdata", (event) => { })

onformdata = (event) => { }

Inherits properties from its parent interface, Event.

FormDataEvent.formData

Contains the FormData object representing the data contained in the form when the event was fired.

// grab reference to form

const formElem = document.querySelector("form");

// submit handler

formElem.addEventListener("submit", (e) => {
  // on form submission, prevent default
  e.preventDefault();

  console.log(formElem.querySelector('input[name="field1"]')); // FOO
  console.log(formElem.querySelector('input[name="field2"]')); // BAR

  // construct a FormData object, which fires the formdata event
  const formData = new FormData(formElem);
  // formdata gets modified by the formdata event
  console.log(formData.get("field1")); // foo
  console.log(formData.get("field2")); // bar
});

// formdata handler to retrieve data

formElem.addEventListener("formdata", (e) => {
  console.log("formdata fired");

  // modifies the form data
  const formData = e.formData;
  // formdata gets modified by the formdata event
  formData.set("field1", formData.get("field1").toLowerCase());
  formData.set("field2", formData.get("field2").toLowerCase());
});

The onformdata version would look like this:

formElem.onformdata = (e) => {
  console.log("formdata fired");

  // modifies the form data
  const formData = e.formData;
  formData.set("field1", formData.get("field1").toLowerCase());
  formData.set("field2", formData.get("field2").toLowerCase());
};

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