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Struts - Forward page Problem

Posted on 2004-08-18
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Last Modified: 2012-08-14
I have ShowList.jsp ( in my struts ) as follows:

 ----------------------            -----------------------------
|   FilterList.jsp      |          |  RegisterMaskList.jsp     |
|                           |         |                                    |
 ----------------------            -----------------------------
  ------------------------------------------------------------
|                                                                            |
|            show the list here                                      |
|                                                                            |
|                                                                            |
  ------------------------------------------------------------

As the JSP name describes, each has different operations and the two JSP's are included in ShowList.jsp.


My Action-Mapping in struts-config.xml is as follows:

<action-mappings>

<action  attribute="registerMaskForm" input="/jsp/ManageCapacity/RegisterMaskList.jsp" name="registerMaskForm"  path="/registerMask"  scope="request" type="de.grassgmbh.calendertool.action.RegisterMaskAction" unknown="false" validate="true">

<forward name="r_success" path="/jsp/ManageCapacity/ShowList.jsp" redirect="false" contextRelative="false" />
</action>

<!-- And similarly for my FilterForm.jsp -->

</action-mappings>


If i submit the /jsp/ManageCapacity/RegisterMaskList.jsp:

1. On *success* of vaidate() method in FormBean , it goes to /jsp/ManageCapacity/ShowList.jsp

2. On *failure* of validate() method in my FormBean ( ie. Form submission results in some errors like some field is empty.), it goes to /jsp/registerMask.do and shows the errors.

--> I want BOTH to go to /jsp/ManageCapacity/ShowList.jsp. In case of failure(2nd case above), i need to show the errors in /jsp/ManageCapacity/ShowList.jsp

How can i resolve this? Any ideas to trace out the problems?

Thanks.

Note: I tried redirect="true" also.
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Question by:sangeetha
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LVL 35

Expert Comment

by:TimYates
Comment Utility
You will have to remove the validate() method, and do your validation in the Action de.grassgmbh.calendertool.action.RegisterMaskAction

Then, you can add ActionErrors for faliures in validation, and still forward to the success page...

By default, if the validate() method returns anything, it goes back to the page that was posted, not to another page...

Tim
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by:sangeetha
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Is it possible to include validate() method in Action Class ? ...

Ok..

This is my Action class now: (It re-directs to /jsp/ManageCapacity/ShowList.jsp, but it doesnt show any errors ).

public class FilterAction extends Action {


  public ActionErrors validate( ActionMapping mapping,  HttpServletRequest request) {

            ActionErrors actionErrors = new ActionErrors();
            
            if(request.getParameter("startDate") == null || request.getParameter("startDate").trim().equals("")) {
                  actionErrors.add("startDate", new ActionError("filterForm.startDate.problem"));
            }
            
            if(request.getParameter("endDate") == null || request.getParameter("endDate").trim().equals("")) {
                  actionErrors.add("endDate", new ActionError("filterForm.endDate.problem"));
            }
            
            return actionErrors;
      }  
   
public ActionForward execute( ActionMapping mapping,        ActionForm form, HttpServletRequest request,  HttpServletResponse response) throws Exception {
            
          FilterForm filterForm = (FilterForm) form;
          Logger logger = Logger.getLogger("FilterAction");
          
          logger.info("Filter Action Invoked");
          
          return mapping.findForward("success");
      }
      
}

In the Console window, i get "Filter Action Invoked" .

Also, can i use validate() for Struts-Validator using "extends ValidatorForm" in my above Action Class.
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by:sangeetha
Comment Utility
i mean if i left the "startDate" field empty, it has to show the errors... but it is not showing. I need to show the error in my ShowList.jsp

Thanks for your patience.
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Accepted Solution

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TimYates earned 500 total points
Comment Utility
public class FilterAction extends Action
{
    public ActionErrors validate( HttpServletRequest request)
    {
        ActionErrors actionErrors = new ActionErrors();
        if(request.getParameter("startDate") == null || request.getParameter("startDate").trim().equals(""))
        {
             actionErrors.add("startDate", new ActionError("filterForm.startDate.problem"));
        }
        if(request.getParameter("endDate") == null || request.getParameter("endDate").trim().equals(""))
        {
             actionErrors.add("endDate", new ActionError("filterForm.endDate.problem"));
        }
        return actionErrors;
    }  
   
    public ActionForward execute( ActionMapping mapping, ActionForm form, HttpServletRequest request,  HttpServletResponse response) throws Exception
    {
        FilterForm filterForm = (FilterForm) form;
        Logger logger = Logger.getLogger("FilterAction");
        logger.info("Filter Action Invoked");
        ActionErrors errors = validate( request ) ;
        if( !errors.isEmpty() )
        {
            logger.info( "Got errors" ) ;
            saveErrors( request, errors ) ;
        }
        return mapping.findForward("success");
    }
}
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LVL 35

Expert Comment

by:TimYates
Comment Utility
So basically, you call the validate method in the Action yourself, and if there are any errors, save them into the request object (using the saveErrors method supplied wih the Struts Action class)

Hope this helps :-)
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by:sangeetha
Comment Utility
fine...and how can i show the errors in my Page. I see "Got errors" in my console window. Ialso  need to show the error "Field cannot be empty" in my output page.

I defnined the error in resources file. and in my FilterList.jsp, i have the the following to show the erros:

<html:messages id="error">
  <TR><bean:write name="error"/></TR>
</html:messages>

Thanks for your help. :-)
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LVL 35

Expert Comment

by:TimYates
Comment Utility
try replacing:

<html:messages id="error">
  <TR><bean:write name="error"/></TR>
</html:messages>

with

<html:errors/>

And put:

errors.header=
errors.prefix=<TR>
errors.suffix=</TR>
errors.footer=

in your ApplicationResources.properties file

Also, make sure redirect="false" in the struts-config.xml

If you redirect, you have to write an interim stage to save the errors into the session instead of the request, and then write a listener to extract them back out again :-)

Tim
0
 
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Author Comment

by:sangeetha
Comment Utility
>> Also, make sure redirect="false" in the struts-config.xml

Ok.. If i have "true", it re-directs but doesn't show errors. If i set to "false" it shows errors (also shows RegisterList JSP, which i want :-) ) but in the URL, i see:

/jsp/filter.do

>> If you redirect, you have to write an interim stage to save the errors into the session instead of the request, and then write a listener to extract them back out again :-)

I think i should go for this. Could you please explain me about this? If this is getting longer, i will post a new Q for this.

Is what i am doing is a good way ? Or, Is there any other way ?
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by:sangeetha
Comment Utility
Ok.. I accept this and post a new Q.

Just small doubts.

1. Is this a good way ?

2. Can i extend ValidatorForm in my Action class,  because i want to use Struts-Validator (using validation.xml file) later.

Thanks.
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Expert Comment

by:TimYates
Comment Utility
the struts validator will take you back to the page that caused the error.

what you are doing is not what struts expects (going to next page even if there is a validation error), so you have to handle it yourslef like this :-(

You *may* be able to invoke the StrutsValidator yourself...I've never tried :-(

Good luck with it!!

:-)

Tim
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by:sangeetha
Comment Utility
Thanks.

http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_21097945.html

If it is not a problem, just one more Q :

Is there an alternate way of doing instead of my FIRST post. i.e. Instead of having 3 jsp's (2 form-bean, 2 form-action) ?
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Expert Comment

by:TimYates
Comment Utility
I'm not sure...can you explain the situation a bit more?  I am not 100% sure of the problem :-(

Ahhh, you mean stop having an action for each of the 2 jsps?

Sure, you can tie the same action, and actionform to more than one jsp.  But you have to be careful if the functionality is different depending on which page you are on, as things can start to get tricky (and debugging can start to become a nightmare) :-(

If I have missed the point, please explain more :-)

Tim
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LVL 35

Expert Comment

by:TimYates
Comment Utility
PS:  You should be able to delete your link question in JSP :-)
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