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Date: Tue, 15 Aug 2000 11:02:51 -0700
From: Craig McClanahan <Craig.McClanahan@eng.sun.com>
Organization: Sun Microsystems, Inc.
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To: tomcat-user@jakarta.apache.org
Subject: Re: Using expressions in tag attributes
References: <399932AC.3090702@enetgroup.co.uk> <399972A5.D929CBBF@eng.sun.com>
 <39997830.D7F3450@enetgroup.co.uk>
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Rachel Greenham wrote:

> Craig McClanahan wrote:
> >
> > Rachel Greenham wrote:
> >
> > > Should I be expecting this sort of thing to work?
> > >
> > > <%
> > > String name="wibble";
> > > %>
> > > <myprefix:GetVariable name="<%=name%>"/>
> > >
> > > ie: using an expression in an attribute to a taglib tag. It doesn't
> > > work, and I think I can see why, but as it does on HTML it would be
> > > intuitive if it did.
> > >
> >
> > This should work if you declare, in your tag library descriptor file, that
> > this attribute takes runtime expression values.  You would need something
> > like this:
> >
> >     <attribute>
> >         <name>name</name>
> >         <required>true</required>
> >         <rtexprvalue>true</rtexprvalue>
> >     </attribute>
> >
> > Craig
>
> Yeah, I noticed that myself a little while after posting. :-} However, see
> my other postings, there do seem to be problems with this, in that things
> don't work properly if the expression you're passing contains any string
> constants (ie: quoted values)
>
> ie: to extend my above example:
>
> <myprefix:GetVariable name="<%=request.getParameter("name")%>"/> will fail.
>

Try single quotes for one set and double quotes for the other:

<myprefix:GetVariable name='<%= request.getParameter("name")%>'/>


>
> --
> Rachel

Craig