Thanks Rick,
I'd like to clarify something here.
> UserActionForm userForm = (UserActionForm)form;
> //userID is set in this form when the user
> clicked on the link
So, even though the jsp containing the list of users
and the links to edit each of them doesnot contain a
form tag, your userForm will still be created and
assigned a userID? I guess that is the case due to the
fact that the UserForm is defined for the
DispatchUserAction and has a request scope so the form
will always be created when the action is invoked.
James
--- Rick Reumann <[EMAIL PROTECTED]> wrote:
> I posted this in reply to Tony's post, but figured
> this stuff comes up
> all the time and to those new to Struts, this below
> might help....
>
> You can accomplish 99% of what you want with this
> simple design
>
> For the sake of this discussion I'm going to assume
> you are using a
> DispatchAction. In case you don't know, a
> DispatchAction just lets you
> combine similar types of behaviors into one
> Controller... so rather than
> have an UpdateUserAction, DeleteUserAction, etc..
> you have one Action...
> UserAction with methods in it update(..),
> delete(...), etc.
>
> So typically here's what I do and it covers 'almost'
> all of my
> scenarios. I find it easier to work with examples
> and your "User" is a
> good example to work with. Lets say we want to CRUD
> (create, retrieve,
> update, delete) for a User.
>
> 1) Step 1 Create a UserActionForm
> For simplicity it has just two main
> properties...
> String userName;
> Integer userID;
> Also though we are going to provide the dispatch
> (or action) as
> a property to give it default value of "add"
> String dispatch = "add"
> This way if we go right to the page it'll have
> 'add' by default
>
> 2) Step 2 Have a BusinessObject back reprsenting
> your User. I like to
> pass Business objects (not tied to Struts to my
> backend), so you'll have
> in this case a simple:
>
> "UserVO" (value object.. could just call it
> "User" but for this
> discussion seeing VO helps you understand what it
> is)
> String userName;
> Integer userID;
>
> //NOTE: it helps if the properties of the VO and
> the ActionForm have
> the same name. Not a requirement but makes things
> easier which I'll show
>
>
> 3) Create a "UserDispatchAction"
>
> This will have the following methods:
> (all with signature public ActionForward
> methodName (ActionMapping
> mapping, ActionForm form, HttpServletRequest
> request,
> HttpServletResponse response)
>
> setUpForEdit(..)
> setUpForAdd(..)
> add(...)
> edit(...)
> delete(...)
> getUsers(...)
>
>
> Before I get to the setUpForEdit() lets just
> handle the others...
>
> In all cases you will be submitting either a
> form or a link but in
> the struts-config file this will map to our
> UserAction where we also
> include the name of our UserActionForm, so our
> UserActionForm is always
> populated.
>
> So our Add method in our Action...
>
> //**ADD****
> public ActionForward add(ActionMapping mapping,
> ActionForm form,
> HttpServletRequest request, HttpServletResponse
> response) throws Exception {
>
> UserActionForm userForm = (UserActionForm)form;
> UserVO user = new UserVO():
> //copy our form properties into the VO
> PropertyUtils.copyProperties( user, userForm );
> ourBackendDelegate.addUser( user );
> return mapping.findForward("to_form");
> }
>
> // UPDATE and DELETE...
> Same as above except for use of...
>
> ourBackendDelegate.deleteUser( user );
> ourBackendDelegate.updateUser( user );
>
> // THE SET UP FOR EDIT
>
> Ok, this is the one you were asking about. Now you
> have to think about
> how you would get here? Typically you'd get to an
> edit page by clicking
> on a user record to say "Hey, I want to edit this
> guy's user
> information" So imagine a case where we have a list
> of users and
> 'userID" for each in the list, they click on the
> link and they'll come
> to this method which will get our user and then
> forward them to a page
> to do the editing. The method will look like...
>
> public ActionForward setUpForEdit(ActionMapping
> mapping, ActionForm
> form, HttpServletRequest request,
> HttpServletResponse response) throws
> Exception {
>
> UserActionForm userForm = (UserActionForm)form;
> //userID is set in this form when the user
> clicked on the link
> //lets get our real business object of this user,
> based on ID..
> UserVO user = ourBackendDelegate.addUser(
> userForm.getUserID() );
> //copy the other way this time, from UserVO to
> our Form...
> PropertyUtils.copyProperties( userForm, user );
> //finally we are going to reuse or form for add
> and edit, so
> //we will set up our dispatch/action parameter
> userForm.setDispatch("edit");
> return mapping.findForward("to_form");
> }
>
>
> //The get users - this will display our users on the
> page
> public ActionForward getUsers(ActionMapping mapping,
> ActionForm form,
> HttpServletRequest request, HttpServletResponse
> response) throws Exception {
> //lets say pass in companyID
> Integer companyID = Integer.valueOf(
> request.getParameter("companyID"));
>
> //get our list of users to display on page
> List users = ourBackendDelegate.getUsers(
> companyID );
> request.setAttribute("users", users );
>
> return mapping.findForward("to_display");
> }
>
> 4) sample config...
>
>
> <action path="/userMaintenance"
> type="com.foobar.UserAction"
> name="userActionForm"
> scope="request"
> validate="false"
> parameter="dispatch">
> <forward name="to_form"
> path="/userForm.jsp"/>
> <forward name="to_display"
> path="/displayUsers.jsp"/>
> </action>
>
> 5) Sample form
>
> <html:form action="/userMaintenance">
> Name: <html:text property="name"/><br/>
> <html:hidden property="userID"/>
> <html:hidden property="dispatch"/>
>
> <html:submit value="${userForm.dispatch}"/>
> <!-- above button logic can be done many ways,
> just for
> simplicity i'm using the dispatch name-->
> <html:form>
>
> 6) Sample page displaying users lets them edit and
> delete them
>
> <c:forEach items='${users}' var='users'>
> <c:url var="editUrl" scope="page"
> value="/userMaintenance.do">
> <c:param name="dispatch"
> value="setUpForEdit"/>
>
=== message truncated ===
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