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jsp method declarations

Posted on 2003-11-21
9
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Last Modified: 2010-04-01
Is there a way of  using jsp custom tag in a jsp declaration such as:

<%!
public void pumpOutChildren(IItem currentItem)
{       
%>
<ms:bindings name="currentItem" id="boundItem">
<%=  
   boundItem.getFullName();
%>
</ms:bindings>
<%
}
%>

as this does not appear to work
0
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Question by:danBosh
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9 Comments
 
LVL 35

Accepted Solution

by:
TimYates earned 30 total points
ID: 9798965
I don't think so, as the <ms:bindings bit is outside the <%! bit, and therefore it is invalid in the generated servlet :-(

<%!
public void pumpOutChildren(IItem currentItem)
{      
%>

opens a new method in the generated Servlet, but it has no closing tags...so the JSP won't compile :-(

I hope you see what I mean...

Tim
0
 
LVL 14

Expert Comment

by:kennethxu
ID: 9798980
The answer to your question is NO!
because :
The tag needs other environment support that you don't have it in your declared method.
And you cannot mix <%! with <%.

Most of jsp processor will extract all <%! and process first, then the rest.
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LVL 35

Expert Comment

by:TimYates
ID: 9799252
yeah...like I said... kinda ;-)
0
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LVL 14

Expert Comment

by:kennethxu
ID: 9801201
sorry, only find that you have your message posted after I post mine.
points to TimYates
0
 
LVL 35

Expert Comment

by:TimYates
ID: 9803271
> sorry, only find that you have your message posted after I post mine.

Hee hee...no worries :-)

I'm new to the JSP TA, and it's nice to see I was right :-)

Hehehe, now to catch you up ;-)

Tim
0
 
LVL 14

Expert Comment

by:kennethxu
ID: 9806302
Tim, I have seen that your answers were/are in high quality. I have limited time to support this TA and welcome all experts to contribute. :-)
0
 

Author Comment

by:danBosh
ID: 9809208
so there is no way of doing this, ignore my syntax, i just want to achieve something like that
0
 
LVL 35

Expert Comment

by:TimYates
ID: 9809494
Hmmmm...

You can do:

<%!
public void pumpOutChildren( IItem currentItem )
{      
    out.println( currentItem.getFullName ) ;
}
%>

Not sure that "out" will be valid though...  you might need to do:

<%!
public void pumpOutChildren( IItem currentItem, PrintWriter out )
{      
    out.println( currentItem.getFullName ) ;
}
%>

Then you can call the method from your JSP code:

<%
  pumpOutChildren( item ) ;
%>

or

<%
  pumpOutChildren( item, out ) ;
%>
0
 
LVL 14

Expert Comment

by:kennethxu
ID: 9812643
>> i just want to achieve something like that
NO, not custom tag in a jsp declaration.

But you might be able to something similar with <jsp:include>
you put you custom tag in an included jsp page, and in the main page use <jsp:include> when you need to call it.
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