javscript evt submitform submitpage code example

Example 1: js form submit listener

document.getElementById("#myFormId").addEventListener("submit", function(e){
    if(!isValid){
        e.preventDefault();    //stop form from submitting
    }
  	//do whatever an submit the form
});

Example 2: buttons js before submit

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