Re: Using Struts tag libs

Lew <lew@lewscanon.nospam>
Fri, 20 Jul 2007 23:14:31 -0400
Oleg Konovalov wrote:

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 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()

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:


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