Textbox require field validation using javascript

Form validation is very important, we will use textboxs in many places. we have to do client side validation using javascript. I am showing one example here. After click on button, if textbox value is empty. this will show alert "please enter name".

<html xmlns="http://www.w3.org/1999/xhtml">
    <script type="text/javascript">
        function ValidateForm() {
            var txtName = document.getElementById("txtName").value;
            if (txtName == '')
                alert("please enter name");
Name: <input type="text" id="txtName" /><br />
<br />
<input type='button' value="validate" onclick="ValidateForm();" />


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