The value passed to tag attribute is a simple String.
You have to EVALUATE IT as a expression to get the real value.
You can read the source of Struts2 tag lib to study how they evaluate
the expression.
For example:
in class [org.apache.struts2.components.Property]
(This class is invoked by tag <s:property>)
it calls:
actualValue = (String) getStack().findValue(value, String.class,
throwExceptionOnELFailure);
to retrieve the real value from the value expression
Hope this helps.
2010/11/6 holod <serega.shey...@gmail.com>:
>
> Hello, I want to create simple dummy tag.
> I have an action:
>
> class MyAction extends ActionSupport{
>
> /** Some code*/
> public Department getRoot(){
> /** Some code foes here...*/
> return departmentInstance;
> }
> }
>
> a tag:
> <%...@tag language="java" pageEncoding="UTF-8" body-content="empty" %><%@
> attribute name="tree" required="true"%><%@ taglib
> uri="http://java.sun.com/portlet_2_0"; prefix="p"%><p:defineObjects /><%...@tag
> import="ejb.model.Department"%><%
> Object attrTree = pageContext.getAttribute("tree");
> System.out.println("TreeTagHelper->tree=["+attrTree+"]");
> if(attrTree!=null){
>
> System.out.println("TreeTagHelper->tree.class=["+attrTree.getClass().getName()+"]");
> }else{
> System.out.println("TreeTagHelper->tree.class=[!!NULL!!!]");
> }
> try{
> //some code...
> }catch(Exception e){
> System.out.println("Error while drawing
> tree["+e.getMessage()+"]");
> }
> %>
>
> and my jsp with tag:
>
> <pext:drawTree tree="root"/>
>
> What do I have to do if I want to pass result of MyAction#getRoot to my
> dummy tag?
>
> I've tried to these:
> <pext:drawTree tree="root"/>
> <pext:drawTree tree="#{root}"/>
> <pext:drawTree tree="${root}"/>
> <pext:drawTree tree="%{root}"/>
>
> Nothing happens, i tag I get String with value "root" or get null.
>
> I can't pass an object to tag attribute... ((((
>
> What do I do wrong?
> --
> View this message in context:
> http://old.nabble.com/How-to-pass-date-from-action-to-custom-jsp-tag--tp30144287p30144287.html
> Sent from the Struts - User mailing list archive at Nabble.com.
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