Question

below is my html form and i dont get any error if i dont have a <form tag, so i add a form tag like this:

<form class="cmxform" id="commentForm" method="post" action="">

get this error:

Microsoft JScript runtime error: 'first_name' is undefined

when i try to read the value of a text box:

First Name:
<input id="first_name" class=" text hasCorners required" maxlength="200" 
name="first_name"   />

function PostData() {
        var _firstName = first_name.value;
        ......
        ......

 $(document).ready(function () {

            $('#btnRegister').click(function () {
                PostData();
            });

Answer 1

Try:

var _firstName = $('#first_name').val();