OK I've overcame this problem by (reluctantly) using
<% if (session.getAttribute("myAgentsVector") == null ) { %>
..... display static html ....
<% } else { %>
..... logic:iterate thru the Vector and bean:write each element's properties
into a table ....
<% } %>
But I keep getting an error message
"Cannot find bean agent in scope null"
where the bean 'agent' is the id given in the logic:iterate tag.
By default - this bean will have page scope, so by using the default
bean:write tag - it should be located.
Here's the key tags that are causing this:
<logic:iterate id="agent" name="myAgentsVector"
type="zeus.generator.web.model.object.Agent" scope="session">
....
<bean:write name="agent" property="name"/>
....
</logic:iterate>
Oh I hope I don't need to begin yet another new subject thread! : (
Cheers.
Lindsay
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: 14 March 2002 16:18
To: [EMAIL PROTECTED]
Subject: <logic:present> and <logic:notPresent> tags - both are being
exec uted!
Hi,
I have an action class (HomeAction) that sets a session attribute (can I
call this a bean!?) which is a java.util.Vector of my own custom Agent
objects. This attribute is only set if the Vector, created by the action
class, is not empty.
Anyway - eventually the HomeAction class will forward to home.jsp which is
where I want to present this Vector in a table. At present, this Vector is
always empty and so the HomeAction class will NOT add it to the session.
Before I continue - here is the troublesome JSP code:
<logic:notPresent name="myAgentsVector" scope="session"
type="java.util.Vector">
<% System.out.println("Did not find session attribute myAgentsVector. User
has no agents"); %>
<tr>
<td width="3"> </td>
<td>
<div align="center">You currently have no agents.</div>
</td>
</tr>
</logic:notPresent>
<logic:present name="myAgentsVector" scope="session"
type="java.util.Vector">
<% System.out.println("Found session attribute myAgentsVector. Creating
dynamic My Agents table"); %>
<!-- START "MY AGENTS" TABLE DYNAMIC CONTENT -->
<logic:iterate id="agent" name="myAgentsVector"
type="zeus.generator.web.model.object.Agent" scope="page">
<% System.out.println("Created a bean called agent - from
myAgentsVector"); %>
<tr>
<td width="3" bgcolor="<bean:write name="agent" property="color"/>"
bordercolor="#CCCCCC"> </td>
<td><bean:write name="agent" property="name" scope="page"/></td>
<td><bean:write name="agent" property="type.name" scope="page"/>
(v<bean:write name="agent" property="type.version" scope="page"/>)</td>
<td><bean:write name="agent" property="status" scope="page"/>/td>
<td>To be defined (using Struts)</td>
</tr>
</logic:iterate>
<!-- END "MY AGENTS" TABLE DYNAMIC CONTENT -->
</logic:present>
I'd expect only the body of the <logic:notPresent> tag to be executed, but
for some reason the <logic:present> tag's body is also being executed. Here
is the console output to show it:
2002-03-14 16:08:30 - Ctx(/struts-SACT) : Compiling: /home.jsp to home_13
Did not find session attribute myAgentsVector. User has no agents
Found session attribute myAgentsVector. Creating dydnamic My Agents table
Created a bean called agent - from myAgentsVector
2002-03-14 16:08:32 - Ctx(/struts-SACT) : Exception in R( /struts-SACT +
/home.jsp + null) - javax.servlet.ServletException: Cannot find bean agent
in scope null
Do any of you wise people ( =oS ) have any idea what I'm doing wrong in
this code.
Many many thanks,
Lindsay
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