On May 8, 2006, at 7:49 AM, Troy Bull wrote:
I have read through the documentation and haven't seen this example
(I may be blind). The error I get is :
[ServletException in:/header.jsp] Error - tag.getAsString :
attribute 'title' not found in context. Check tag syntax'
Ah, I'm sorry. I missed that you were trying to use the title
attribute in the included header page. It looks like you're
basically using the example from the doc, but trying to add the
getAsString to the header.jsp page. I've needed the same
functionality on several occasions. Here's what's happening:
Tiles creates a ComponentContext with 2 attributes title and header.
When it sees <tiles:insert attribute="header"/> in layout.jsp it
invokes the InsertTag. InsertTag creates a sub-ComponentContext that
it puts in request scope. If InsertTag is invoked with no attributes
that sub-context is empty. That's why your "title" attribute is not
being passed along.
There are a couple of ways to hack this:
1) In layout.jsp use the importAttribute tag to put the "title"
attribute in request scope.
2) In layout.jsp use the importAttribute tag to put "title" in page
scope. If you can use EL you can then do the following:
<tiles:insert name="header">
<tiles:put name="title" value="${pageScope.title}"/>
</tiles:insert>
If you're not using EL, you can do the same with scriptlet (I think
the following is legal):
<tiles:insert name="header">
<tiles:put name="title" value="<%= pageContext.findAttribute
("title"); %>"/>
</tiles:insert>
But, I think those are hacks. It would be nice if Tiles
automatically propagated its context down the "component tree". Does
anyone know why it doesn't do that or if there are good motivations
to not do that? There may be history behind this issue that I
missed. Perhaps we could add an attribute to the insert tag that
would do this.
Greg
troy
Greg Reddin said the following on 5/5/2006 3:01 PM:
Have you tried the instructions in the tiles documentation?
http://struts.apache.org/struts-action/struts-tiles/
I think it describes your use case. Are you trying this and
getting some kind of error you can send us?
Thanks,
Greg
On May 5, 2006, at 1:33 PM, Troy Bull wrote:
Greetings
I am new to tiles and so far I like it. I have a question
though. Seems like it should be easy to do but I haven't seen
how yet. I will try to describe the situation as concisely as I
can. This can be reproduced with just 2 jsp files.
layout.jsp (interesting lines only)
<title>
<tiles:getAsString name="title"/>
</title>
</head>
<HR>
<tiles:insert attribute="header"/>
header.jsp
<hr><tiles:getAsString name="title"/></h2>
<hr>
int my tiles-defs.xml I have
<definition name="main.layout" path="/layout.jsp">
<put name="title" value="This is the title"/>
<put name="header" value="/header.jsp"/>
</definition>
And finally, what I want is to display in the browser "This is
the title" inside an H2 tag so that on each screen of my app the
user gets visual feed back for what page they are on.
This seems to me like something I should be able to do but I dont
know how, anyone with any tips I am greatfull.
thanks
troy
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