Make a POST with AJAX and JSON with pure Javascript

Question

I have the following code on jQuery

$.post('/privmsg?', {
    folder: 'inbox',
    mode: 'post',
    post: '1',
    username: 'Wagner',
    subject: 'Título',
    message: 'Mensagem'
});

I am studying Javascript, and would like to do the same effect with pure Javascript.

I did some research and learned to make requests with GET with AJAX, now I would like to know, how do this POST with pure Javascript?

Answer 1

According to the website You Might Not Need jQuery, the syntax is this:

var request = new XMLHttpRequest();
request.open('POST', '/my/url', true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.send(data);

Have this site on your favorites forever you want to do something without jQuery. High up you choose whether you want to see version IE8+, IE9+ or IE10+.

The above version is IE8 compatible+.