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jsp with javascript

simran chandwani

Joined: Jun 29, 2009
Posts: 2
This code is working ok. But when I replace int with String throws error.

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>

int i=0;
String str=null;

<input type="text" id="aa" onclick="alert(<%=i%>);" />
// <input type="text" id="aa" onclick="alert(<%=str%>);" /> this is not working

<script type="text/javascript">

function total(str)



This code is working ok . But when I replace i with str [for eg alert(<%=str%>)] this shows str is not defined. But this code is working ok with i [integer value]

ahmed yehia
Ranch Hand

Joined: Apr 22, 2006
Posts: 424
In the case of Integer, you are passing the int value which is a number.
In the case of String, you are passing the runtime value which is some text representation.

The alert() function doesn't know how to interpret the text value unless its a String,
it assumes you are trying to print a JavaScript variable which in your case doesn't exist.

However to get it to work you will have to enclose the value in single quotes.

You can investigate this further by viewing the source of the JSP file from within the browser.

David Newton

Joined: Sep 29, 2008
Posts: 12617

Please UseCodeTags.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link:
subject: jsp with javascript
jQuery in Action, 3rd edition