Send POST data using XMLHttpRequest

Question

I\'d like to send some data using an XMLHttpRequest in JavaScript.

Say I have the following form in HTML:

<         


        

Answer 1

Use modern JavaScript!

I'd suggest looking into fetch. It is the ES5 equivalent and uses Promises. It is much more readable and easily customizable.

const url = "http://example.com";
fetch(url, {
    method : "POST",
    body: new FormData(document.getElementById("inputform")),
    // -- or --
    // body : JSON.stringify({
        // user : document.getElementById('user').value,
        // ...
    // })
}).then(
    response => response.text() // .json(), etc.
    // same as function(response) {return response.text();}
).then(
    html => console.log(html)
);

In Node.js, you'll need to import fetch using:

const fetch = require("node-fetch");

If you want to use it synchronously (doesn't work in top scope):

const json = await fetch(url, optionalOptions)
  .then(response => response.json()) // .text(), etc.
  .catch((e) => {});

More Info:

Mozilla Documentation

Can I Use (96% Nov 2020)

David Walsh Tutorial