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How javascript check input text size in JSP page?

Posted on 2008-10-21
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Last Modified: 2008-10-21
I need to validate the text input in jsp page with javascript

If null and length > 20
then alert

the following code does not work
<form name="form1" method="POST" action="register.jsp" onsubmit="return Validation(this);">
 
 
<SCRIPT LANGUAGE="JavaScript">
function Validation()
{
if(this.txtName.value=="" || this.txtName.value.length > 20)
{
alert("Please input your name less than 20 chars");
return false;
}else
{
return true;
}	
}
</SCRIPT>
 
<input type="text" name="txtName" id="txtName" maxlength="20">

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Question by:techques
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