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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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