Viewset - active view and data validation problem

Question

Hey there,
I've a problem while using a viewset (1 col, 2 rows) and the data-validation in the wdDoBeforeAction() method.
My application works basically like this:
The first view is displayed with 2 mandatory input fields. Upon the evaluation result of the entered data in these fields, a corresponding second view will be displayed. The input fields in the first view are set to read only and a button named "Change" appears. This button triggers an action which fires and outbound-plug to an empty view, so that the second view disappears and resets the "read only" properties of the input fields in the first view, so that the user can enter new data.
The problem is, that the second view contains input fields itself, which are validated in the wdDoBeforeAction() method of this view. The navigation is cancelled if an error occurs. Well, this is fine if i want to submit (pressing the button "Approve" in the second view) this data and proceed, but if i want to go back to the first view (by hitting the "Change" button), i want to discard all information entered in the second view and i dont want this data to be validated. It's quite annoying if u just want to correct the first views data but have to enter correct values for the second view in order to get through the second views checks..
I hope that's clear enough, otherwise i will upload a screenshot to clarify.
Thx in advance
Regards
Pascal

Answer 1

Hi Pascal,
although I wont prefer to do so for reasons of readability, you could use wdDoProcessbeforeAction to control your view-flow.
Take a look at the example, I have two Buttons with two actions, one is set on "Validate", the other is not (guess which on is the validating ).
You can get the action triggered inside the doBefore ... method and determine whether or not the checkbox is set.
So put your code to validate the input in the i(isValidting) branch and your problems are solved.
Keep in Mind: I would delegate the Validation from the view to the controller, handle the validation myself with custom coding and then check in the view controller if any errors occured.
hope that helped,
Jan
  //@@end
  public void wdDoBeforeAction(com.sap.tc.webdynpro.progmodel.api.IWDBeforeAction validation)
    //@@begin wdDoBeforeAction
       IWDAction currentAction = validation.getCurrentAction();
       if (currentAction == null) return;
       String action = currentAction.getText();
       boolean isValidating = currentAction.isValidating();
       if (isValidating) {
            wdComponentAPI.getMessageManager().reportException(action);
       } else {
            wdComponentAPI.getMessageManager().reportSuccess(action);
    //@@end
Edited by: Jan Galinski (Holisticon) on Sep 8, 2009 3:15 PM