How to trace SUBMIT button

Still using jQuery, you can do this:

$('form').submit(function() {
    // Use this to echo in JS console.
    console.log( $(this).attr('action') );
    // Use this to display a popup.
    alert( $(this).attr('action') );
});

This will track every form being submitted.

Place this between <script> tags or in a JS file. Like @dev said, this for debug purpose, don’t keep this in your code.

You may have to wait for Document to be ready, then you’d use :

// Needs jQuery too.
$(function() {
    // Copy code here.
});