before submit js code example

Example 1: buttons js before submit

$('#myform').submit(function() {
    // DO STUFF...
    return true; // return false to cancel form action
});

Example 2: how to run js before submit html

<form onsubmit="return do_something()">

function do_something(){
   // Do your stuff here
   return true; // submit the form

   return false; // don't submit the form
}

Example 3: buttons js before submit

<form id="myform">
...
</form>