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From VSG <srikanthgou...@gmail.com>
Subject Re: Struts 2 Tiles 2 Runtime composition
Date Thu, 11 Dec 2008 04:46:53 GMT

Hi Pauli,
 
 I am working on the same requirement. I have done some thing like this
  <definition name="preparer" preparer="TestViewPreparer" >
       <put-attribute name="title" value="Tiles tutorial homepage" />
       <put-attribute name="header" value="/layouts/header.jsp" />	 
        <put-attribute name="body" value=="???{nextPage}???" />
        <put-attribute name="footer" value="/layouts/header.jsp" />
     </definition> 

In testViewPreparer
 
 HttpServletRequest serReqObj =
(HttpServletRequest)tilesContext.getRequest();
 ValueStack valuStack = ServletActionContext.getValueStack(serReqObj);
 String nextPage = valuStack.findString("nextPage");  
 attributeContext.putAttribute("body",new Attribute(nextPage));

In jsp

<tiles:insertDefinition name="preparer.definition" />

here I am facing two problems

 1. value stack is giving null value.
 2.i hard code the nextPage value some how but after that the exception:-

 java.lang.NullPointerException
	at
org.apache.struts2.tiles.StrutsTilesRequestContext.dispatch(StrutsTilesRequestContext.java:82)
	at
org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:417)
	at
org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:368)
	at
org.apache.tiles.jsp.taglib.InsertDefinitionTag.render(InsertDefinitionTag.java:63)
	at
org.apache.tiles.jsp.taglib.RenderTagSupport.execute(RenderTagSupport.java:171)
	at
org.apache.tiles.jsp.taglib.RoleSecurityTagSupport.doEndTag(RoleSecurityTagSupport.java:75)
	at
org.apache.tiles.jsp.taglib.ContainerTagSupport.doEndTag(ContainerTagSupport.java:80)
	at
org.apache.jsp.second_jsp._jspx_meth_tiles_005finsertDefinition_005f0(second_jsp.java:86)
	at org.apache.jsp.second_jsp._jspService(second_jsp.java:59)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

 
 know my question is it the correct way of doing the things.
 can u help me out how u finshed the things.

 VSG.

 
 
 

       
 


Pauli Savolainen wrote:
> 
> Hi,
> 
> I am attempting to change an existing tiles definition during an execution
> of a Struts action. Example tiles definition:
> 
> <definition name="layout" template="/layout.jsp">
>   <put-attribute name="head" value="/head.jsp" />
>   <put-attribute name="body" value="/login.jsp" />
> </definition>
> 
> In the action I want to choose a correct body value based on some
> application specific rules. For example if I call:  /user/1, the User
> action's show method is executed and the body attribute's value would turn
> into /user/show.jsp. This would prevent me from writing definitions for
> each
> possible case.
> 
> Tile tutorial says I can get my hands on an attribute context (The class
> TilesAttributeContext does not exist in my tiles plugin build). In the
> action I do:
> 
> TilesAttributeContext attributeContext = container.startContext(request,
> response);
> attributeContext.setAttribute("body", "/user/show.jsp");
> container.render("layout", request, response);
> container.endContext(request, response);
> 
> I bet this is not the correct way to do it, because it seems that the
> tiles
> definition overrides the value I insert here. Even if I do this in an
> interceptor after the action result, the value is not changed.
> 
> I suppose there is no option in tiles to define definition with wildcards.
> At least I did not find this option. I could point my action results
> dynamically to a definition with wildcards.
> 
> <definition name="layout" template="/layout.jsp">
>   <put-attribute name="head" value="/head.jsp" />
>   <put-attribute name="body" value="/login.jsp" />
> </definition>
> 
> <definition name="layout.*.*" extends="layout">
>   <put-attribute name="body" value="/{1}/{2}.jsp" />
> </definition>
> 
> So my question is how would I achieve what am I try to do? Am I on the
> right
> tracks and just missing something, or is this even possible?
> 
> I am using 2.1.1-SNAPSHOT builds struts-core and struts tiles-plugin.
> 
> Thank you
> 
> Pauli
> 
> 

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