Filter Form Parameters Before Submitting

Question

Is there a way to check the parameter if its empty or not before submitting?

Answer 1

Pure javascript method

form.onsubmit=function(){
  var arr=this.elements,i=0,l=arr.length;
  for(;i

To answer OP's further question

function checkForm(){
  var arr=this.elements,i=0,l=arr.length;
  for(;i