Hey Eric, this is a great detailed response and would make a good wiki
page - theres one for the similar EventActionDispatcher - but your
answer looked more readable
http://wiki.apache.org/struts/EventActionDispatcher
if you feel like adding it I'm sure others would appreciate it down the road.
Niall
On 12/12/06, Eric Rank <ericrank@(protected):
> One of my favorite subclasses is EventDispatchAction. Check it out:
> http://struts.apache.org/1.x/struts-extras/apidocs/org/apache/struts/
> actions/EventDispatchAction.html
>
> Basically, it works by allowing you to define various methods in your
> Action class, which are tied to your various submit buttons. By
> defining specific methods depending on your type of form submission,
> you can manually validate your form when you want to.
>
> For example, if I have a form showing a record from a database, I
> might have 3 different submit buttons. "Delete", "Update", and
> "Retrieve". the code in the jsp would be like:
> <html:form action="multipleButtons">
> <html:submit property="action_delete">Delete</html:submit>
> <html:submit property="action_update">Update</html:submit>
> <html:submit property="action_retrieve">Retrieve</html:submit>
> </html:form>
>
> The action mapping will contain a "parameter" attribute where you'll
> name all of the potential ways that you might submit this form. The
> comma delineated values will match the values of the "property"
> attributes in your submit buttons. These will then link up to methods
> with the same name in your subclass of EventDispatchAction. Your
> action mapping in the struts-config.xml might look like the following.
>
> <action
> path="/multipleButtons"
> input="/WEB-INF/jsp/multipleButtons.jsp"
> type="MyEventDispatchAction"
> name="MyForm"
> validate="false"
> scope="request"
> parameter="action_delete,action_retrieve,action_update"
> >
> </action>
>
> Finally, your subclass of EventDispatchAction would look like this
>
> public class MyEventDispatchAction extends EventDispatchAction {
>
> //Executes when the "action_delete" button is selected
> public ActionForward action_delete(ActionMapping mapping,
> ActionForm form,
> HttpServletRequest request,
> HttpServletResponse response
> )throws Exception{
> //no validation
> ActionForward forward = mapping.findForward("success");
> return forward;
> }
>
> //Executes when the "action_update" button is selected
> //This is where I want to validate
> public ActionForward action_update(ActionMapping mapping,
> ActionForm form,
> HttpServletRequest request,
> HttpServletResponse response
> )throws Exception{
> ActionForward forward = mapping.getInputForward();
> //I want validation here!
> ActionMessages errors = form.validate();
> if(errors.isEmpty){
> //go ahead and save the record
> forward = mapping.findForward("success");
> }
> return forward;
> }
>
> //Executes when the "action_retrieve" button is selected
> public ActionForward action_retrieve(ActionMapping mapping,
> ActionForm form,
> HttpServletRequest request,
> HttpServletResponse response
> )throws Exception{
> //no validation
> ActionForward forward = mapping.findForward("success");
> return forward;
> }
> }
>
> I've had good success using this class. I hope it fits the bill for you.
>
> Eric Rank
>
>
> On Dec 12, 2006, at 10:00 AM, Thom Burnett wrote:
>
> > I have a few buttons on my jsp page and I want to have validation
> > happen on
> > some buttons and not on other buttons.
> >
> > Is that possible? How? Any examples around?
>
>
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