Newbie logic:iterator question

[Dave Hoover <da...@redsquirrel.com>]

I need to display an HTML table using Struts.  The table contents 
are the results of a database query.  It seems that the <logic:iterate> 
tag is the way to do what I want, but I just cannot seem to get the 
thing to work.

I was just Googling for an answer and came across 
"A Walking Tour of the Struts Example Application"
(http://struts.application-servers.com/struts-layout/tour.htm).
In this Tour, it describes the following  iterate tag like this:

  <logic:iterate name="user" property="subscriptions" id="subscription">
  <!-- block to repeat -->
  </logic:iterate>

  The three parameters to the iterate tag ( name, property, and id)
  tell it to

  1. Check this context for an attribute (e.g. object) named "user",
  2. Snag the property of user named "subscriptions",  
  3. In the block to iterate, use "subscription" (singular) as the
  name for each member of the collection.

I have no idea how or where I define the "user" object.  I can't 
figure out where the Struts example application is defining this.


Also, the object that I want to iterate over is a Vector of HashMaps.
Would I use nested iterate tags?  Is it possible to do what I'm 
trying to do?  I need a bit of guidance, perhaps I'm making this 
too difficult.

Thanks,
Dave the Confused Newbie







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Re: Newbie logic:iterator question

[Alexis Gallagher <al...@yahoo.com>]

Hi Dave,

> I have no idea how or where I define the "user"
> object.  I can't 
> figure out where the Struts example application is
> defining this.

Define the user object using a <jsp:useBean ..> tag or
a struts <bean:define> tag. Personally, I've never
gotten <bean:define> to work so I've got loads of jsp
snippets like the following, which renders a table
listing the system's users:

	<jsp:useBean id="userListHelper" scope="request"
class="com.tpc.UserListHelper" />

	  <logic:iterate id="item" name="userListHelper"
property="userList" indexId="index">
    <td><bean:write name="item" property="username"
/></td>
...
</logic:iterate>

So this creates an instance of my javabean class
called com.tpc.UserListHelper. This class has a public
method getUserList() which returns a List object. It
then iterates through all those objects and calls
their getUsername() method, which returns a String.

Hope this helps,
Alexis 

--- Dave Hoover <da...@redsquirrel.com> wrote:
> I need to display an HTML table using Struts.  The
> table contents 
> are the results of a database query.  It seems that
> the <logic:iterate> 
> tag is the way to do what I want, but I just cannot
> seem to get the 
> thing to work.
> 
> I was just Googling for an answer and came across 
> "A Walking Tour of the Struts Example Application"
>
(http://struts.application-servers.com/struts-layout/tour.htm).
> In this Tour, it describes the following  iterate
> tag like this:
> 
>   <logic:iterate name="user"
> property="subscriptions" id="subscription">
>   <!-- block to repeat -->
>   </logic:iterate>
> 
>   The three parameters to the iterate tag ( name,
> property, and id)
>   tell it to
> 
>   1. Check this context for an attribute (e.g.
> object) named "user",
>   2. Snag the property of user named
> "subscriptions",  
>   3. In the block to iterate, use "subscription"
> (singular) as the
>   name for each member of the collection.
> 
> I have no idea how or where I define the "user"
> object.  I can't 
> figure out where the Struts example application is
> defining this.
> 
> 
> Also, the object that I want to iterate over is a
> Vector of HashMaps.
> Would I use nested iterate tags?  Is it possible to
> do what I'm 
> trying to do?  I need a bit of guidance, perhaps I'm
> making this 
> too difficult.
> 
> Thanks,
> Dave the Confused Newbie
> 
> 
> 
> 
> 
> 
> 
> --
> To unsubscribe, e-mail:  
> <ma...@jakarta.apache.org>
> For additional commands, e-mail:
> <ma...@jakarta.apache.org>
> 


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