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Posted to users@tiles.apache.org by Ken Bowen <kb...@als.com> on 2010/03/18 17:41:57 UTC

Problem passing attribute from Definition to Layout

Hi All (esp. Antonio),

I'm having a problem passing an attribute from a Tiles definition into  
a layout page.
This is something which works for me using Tiles 2.06 on Tomcat 6.0.20,
but is failing using Tiles 2.07 on Google App Engine.

Here is my stripped-down example. The target browser page will be
			 testa.jsp
The desired goal is to pass the "pagename" attribute from tiles- 
defs.xml to testLayout.jsp:
{And the real goal is to get that parameter value passed into the  
Javascript for the page.}

testa.jsp
=============

<%@ page contentType="text/html;charset=UTF-8" language="java"   
session="false" %>
<%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %>

<tiles:insertDefinition name="test.testa" />
------------

testLayout.jsp
==============
<%@ page contentType="text/html;charset=UTF-8" language="java"  
session="false" %>
<%@page import="java.net.URLDecoder"%>
<%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c" %>

<tiles:importAttribute name="pagename" />                     <<<<<<<  
Tiles import here

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd 
">
<html>
<head>
     	<meta http-equiv="content-type" content="text/html;  
charset=UTF-8">
     	<title><tiles:getAsString name="page_title"/></title>
</head>
   	
<script type='text/javascript'>
function pageinit(whatpage){
	alert("pageinit: "+whatpage);
}
</script>
</head>

<body onload="pageinit('${pagename}');">                      
<<<<<<<<<< Evaluate import here
<h1><tiles:getAsString name="page_title"/></h1>
   layout stuff....
</body>
</html>
------------

tiles-defs.xml
=============
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE tiles-definitions PUBLIC
        "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
        "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">
<tiles-definitions>

<definition name="test.common" 	    template="/layouts/testLayout.jsp">
     <put-attribute name="footer"    value="/tiles/myfooter.jsp" />
     <put-attribute name="pagename"  value="defaultpage" />
</definition>

<definition name="test.testa"         extends="test.common">
     <put-attribute name="pagename"    value="test.atesta" />          
<<<<< Attribute value originates here
     <put-attribute name="page_title"  value="Test TestA" />
</definition>

</tiles-definitions>
------------

I expect to see the Javascript alert showing:
			pageinit: test.testa

However, I only get
			pageinit: ${pagename}

The complete generated page source for testa.jsp is:

=============
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd 
">
<html>
<head>
     	<meta http-equiv="content-type" content="text/html;  
charset=UTF-8">
     	<title>Test TestA</title>

</head>
   	
<script type='text/javascript'>
function pageinit(whatpage){
	alert("pageinit: "+whatpage);
}
</script>
</head>

<body onload="pageinit('${pagename}');">
<h1>Test TestA</h1>
   layout stuff....
</body>
</html>
------------

I have the standard.jar and jstl.jar jars on the classpath.  I / 
thought/ that and Tiles was all I used in the Tiles 2.06 + Tomcat  
project where this works.  I'm probably missing something, but I don't  
see what.

Any pointers/thoughts on what I've missed will be greating appreciated.
Thanks in advance,
Ken Bowen

Re: Problem passing attribute from Definition to Layout

Posted by Ken Bowen <kb...@als.com>.
That may be the problem.  I'm having difficulty in determining just  
what Servlet/JSP is supported by Google App Engine.
Fortunately, I just realized there is a "workaround" for me that skips  
the ImportAttribute and $()   Namely, using the same Tiles Definitions  
in my example,  I just need to write

<body onload="pageinit('<tiles:getAsString name="pagename"/>');">

to get the desired value of "pagename" from the Definition passed into  
Javascript for the testLayout.jsp page.

But I'll look into what Servlet/JSP is supported by Google App Engine,  
or whether it will allow me to use custom tags.

Thanks much,
Ken


On Mar 18, 2010, at 12:48 PM, Antonio Petrelli wrote:

> 2010/3/18 Ken Bowen <kb...@als.com>:
>> I expect to see the Javascript alert showing:
>>                        pageinit: test.testa
>>
>> However, I only get
>>                        pageinit: ${pagename}
>
> What servlet version are you using? To use EL directly in JSP pages
> (without custom tags) you must use at least Servlet 2.4/JSP 2.0.
>
> Antonio

Re: Problem passing attribute from Definition to Layout

Posted by Antonio Petrelli <an...@gmail.com>.
2010/3/18 Ken Bowen <kb...@als.com>:
> I expect to see the Javascript alert showing:
>                        pageinit: test.testa
>
> However, I only get
>                        pageinit: ${pagename}

What servlet version are you using? To use EL directly in JSP pages
(without custom tags) you must use at least Servlet 2.4/JSP 2.0.

Antonio