Baseline Widely available
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.
A FormData object.
// 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);
});
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