Re: Handle images path in one place

[Erik Weber]

Thank you.

Erik

Craig McClanahan wrote:

On Thu, 10 Feb 2005 23:09:51 -0500, Erik Weber <[EMAIL PROTECTED]> wrote:

Sorry, I was using the html-el tag, not the html tag:

<html-el:img src="${somePath}/images/foo.jpg"/>

I think you should be able to do what you want without the el tags if
you are using JSP 2.0, but to be honest, someone else needs to jump in
and bail me out here on that. I think it's a configuration problem. (web
app 2.3 v 2.4 or something?)

You are definitely on the right track.

If you are using a Servlet 2.4/JSP 2.0 container (such as Tomcat 5.x),
you can enable support for EL expressions globally in your pages (even
in template text -- it doesn't have to be in a custom tag attribute). This requires telling the container that you are a Servlet 2.4 webapp,
by including the following as the root element:

   <web-app       xmlns="http://java.sun.com/xml/ns/j2ee";
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
   xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
                    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";
           version="2.4">

instead of the DOCTYPE declaration used on previous versions.  Doing
this makes the struts-el library totally superfluous -- EL expressions
work as expected on all the standard Struts tags.

This capability lets you do some cute things, even without a lot of
custom tags.  Consider the following example (using JSTL tags) where
"customers" is an attribute that contains an array (or List) of
Customer beans.

   <table>
       <tr>
           <th>Id</th>
           <th>Name</th>
       </tr>
       <c:forEach items="${customers}" var="customer">
           <tr>
               <td>${customer.id}</td>
               <td>${customer.name}</td>
           </tr>
       </c:forEach>
   </table>

(Note that you can get the same sort of filtering that <bean:write>
does for you, to avoid cross site scripting attacks, by using things
like "<c:out value='${customer.id}'/>" instead of "${customer.id}" if
you need it.)

(If you want to do *input* into a table like this, consider using
JavaServer Faces (JSF) components like <h:dataTable> instead ... it
manages all the hard parts for you.)

Erik

Craig

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