Using Struts tag libs

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Oleg Konovalov - 21 Jul 2007 03:47 GMT

Hi,

I am relatively new to Struts [using 1.3].

I need to create a form using Struts tag libs with 2 HTML select's [lists],
connected to 2 DB tables, say allUsers and Admins, which would allow
to select Administrators from the list of AllUsers.

So I will have 3 buttons: Add, Remove and Update.
Add - to add selected item(s) from AllUsers list to Admins list [if it is
not there already];
Remove- to delete selected item(s) from Admins list;
Update - to save changes to Admins list to the Admins DB table.

So roughly my JSP will looks something like that:

<%@ page import="java.util.Collection" %>

<html:form property="manageAdmins" action="/manageAdmins">

<table>
<tr>
<td>  </td>
<td>All Users:</td>
<td>  </td>
<td>  </td>
<td>  </td>
<td>Administrators:</td>
</tr>
<tr>
<td> </td>

<td>
<html:select size="8" property="allUsers" multiple="true"
styleId="allUsersID">
<html:options collection="AllUsersList" property="AllUsersId"
labelProperty="allUsers"/>
</html:select>
</td>
<td> </td>
<td>
<table>
<tr><img src="/images/btn_add.gif" alt="Add" name="add" border="0"
id="add" onClick="?">
</tr>
<tr><img src="/images/btn_remove.gif" alt="Remove" name="remove"
id="remove" onClick="?">
</tr>
<tr><img src="/images/btn_update.gif" alt="Update" name="update"
id="update" onClick="?">
</tr>
</table>
</td>
<td> </td>
<td>
<html:select size="8" property="admins" multiple="true"
styleId="adminsID" onchange="getAdmins();">
<html:options collection="AdminsList" property="AdminID"
labelProperty="admins"/>
</html:select>
</td>
</tr>
<tr>
</tr>
</table>
</html:form>

So how do I manipulate these <html:options collection=AdminList...> Struts
tags
in order to implement Add, Remove, Update ? In onClick="..." ?
Is it in JavaScript or in Java ?
Any other useful Struts tags for that [especially to do DB synchronization]?
Code snippets ?

Sorry for the newbie question.

Thank you in advance,
Oleg.

A

Reply to this Message

David Mark - 21 Jul 2007 04:06 GMT

> Hi,
>
> I am relatively new to Struts [using 1.3].

Wrong group.

Reply to this Message

Lew - 21 Jul 2007 04:17 GMT

"Oleg Konovalov" wrote:

>> Hi,
>>
>> I am relatively new to Struts [using 1.3].

> Wrong group.

Which group was wrong? It was perfectly fine for the group from which I'm
responding, comp.lang.java.help.

Since the OP sent to many groups, it would help them to know which ones were
inappropriate. Of course, they really should have stuck with one in the first
place, or perhaps set follow-up to just one. I suggest comp.lang.java.help.

Signature

Lew

Reply to this Message

Richard Cornford - 22 Jul 2007 14:31 GMT

>>> I am relatively new to Struts [using 1.3].
>
[quoted text clipped - 5 lines]
> Since the OP sent to many groups, it would help them to know
> which ones were inappropriate.

<snip>

The intended 'wrong group' was almost certainly comp.lang.javascript,
but as David posted from Google groups it is likely that he was unaware
of all the Java groups in the cross posting (as it takes positive action
on the part of their users to see the list of groups in a message's
Newsgroups header). On the other hand, as the question included "Is it
in JavaScript or in Java?" I don't see how comp.lang.javascript could be
the wrong group for asking the question, even if it becomes the wrong
group for any discussion of the answer as soon as the answer 'Java' is
given.

Richard.

Reply to this Message

Lew - 21 Jul 2007 04:14 GMT

> I am relatively new to Struts [using 1.3].
>
[quoted text clipped - 7 lines]
> Remove- to delete selected item(s) from Admins list;
> Update - to save changes to Admins list to the Admins DB table.

...

> So how do I manipulate these <html:options collection=AdminList...
> Struts tags in order to implement Add, Remove, Update ?
> In onClick="..." ? Is it in JavaScript or in Java ?
> Any other useful Struts tags for that [especially to do DB synchronization]?
> Code snippets ?

Forget Javascript for now. I'm reading this in one of the many, many Java
groups to which you posted your request - you should set follow-up to just one
of them. Struts is primarily a server-side application framework that
coordinates the thin-client view artifacts (JSPs) with the application logic.

On the server side the Struts "ActionServlet" (the "controller") will forward
the request parameters to an "Action" class, with parameters from the request
captured in an "ActionForm" class. It is the Action class that forwards the
request information to business logic and maybe populates the ActionForm with
the results, then reports the outcome to Struts.

The Struts framework invokes the execute() method of the Action class, which
in turn returns an ActionForward return type object that the Struts framework
uses to choose the next view (JSP). The execute() method coordinates logic
invoked via custom logic-class instances (typically JavaBeans) that you write
to handle the application-specific behaviors. The ActionForward return object
encapsulates the success, failure or other termination state of the execute()
invocation.

Values in the ActionForm, session scope or elsewhere may change as a result of
the Action object's execute().

The next screen will dutifully show those values.

Struts implements the "Model-View-Controller" paradigm, and supplies the
controller and the glue to join the three parts. Wikipedia is a good source
of knowledge for that. So is Sun. The JSPs represent the view, and should
have no business logic coded in them at all. The model layer, those
server-side classes invoked by the Action classes, handles all logic. Struts
glues the navigation together with its controller.

For more, see:
<http://struts.apache.org/1.3.8/userGuide/index.html>

Signature

Lew

Reply to this Message

Oleg Konovalov - 23 Jul 2007 03:30 GMT

Thank you for the Struts intro,
but I don't see how that answers any of my questions...

Thanks,
Oleg.

>> I am relatively new to Struts [using 1.3].
>>
[quoted text clipped - 51 lines]
> For more, see:
> <http://struts.apache.org/1.3.8/userGuide/index.html>

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Using Struts tag libs

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