ADF Faces + BC 10.1.3: prompting to save changes after any navigation

Question

Hello all,
Working on an application that uses ADF Faces + Business Components. We're using the PanelPage component and using a menu tree model bean specified in faces-config.xml for the menu1, menu2, and menu3 facets of the PanelPage.
What we'd like to be able to do is, regardless of what page the user is on, be able to check if the user is trying to navigate via the menu without having saved changes and then prompt them "do you want to save your changes" with a Dialog.
Creating the dialog is the part I know how to do, but how could I, in a generic way:
a). Have some code execute during the navigation. I assume this is a custom ADFPhaseListener/FacesPageLifecycle class, but not sure.
b).Detect whether the model has uncommitted changes. I assume this is something on the Application Module, but could not figure this out.
Has anyone done something like this before?
Thanks for any insight into this.
Regards,
John

Answer 1

OK, gang, here's an update:
I wanted to try to, in a generic way, capture changes that have happened to the data without having to go through a change listener on each field. Since my pages are all based upon BC View Objects with underlying Entity Objects, I have cobbled together some code (with lots of stuff hard-coded for now) that is able to tell me whether the data has been modified or not. The way I have the code right now, it works if the page is based upon one view object that has one underlying entity. Extending this to a view object that has multiple entities should be relatively straightforward (just loop through all of the entities and look for modifed status, instead of looking at only the first one).
    System.out.println("Starting the test");
    FacesContext ctx = FacesContext.getCurrentInstance();
    Application app = ctx.getApplication();
    ValueBinding bind = app.createValueBinding("#{data.AppModuleDataControl.dataProvider}");
    AppModuleImpl svc = (AppModuleImpl) bind.getValue(ctx);
    ViewObject v = svc.findViewObject("InputSheetView1");
    ViewRowImpl vri = ((ViewRowImpl)vo.getCurrentRow());
    EntityImpl ei = vri.getEntity(0);
    int i = (int) ei.getEntityState();
    System.out.println(Entity.STATUS_NEW);
    System.out.println(Entity.STATUS_UNMODIFIED); 
    System.out.println(Entity.STATUS_MODIFIED); 
    System.out.println(Entity.STATUS_DELETED);   
    System.out.println(Entity.STATUS_DEAD); 
    System.out.println(Entity.STATUS_INITIALIZED);     
    System.out.println("The answer is");
    System.out.println(i);
    System.out.println("Finishing the test");Now, how to make this generic. How could I, from the page's backing bean:
1). Determine the name of the data control(s) used on the page? Alternatively, how to determine the name of the application modules used by the page? I know this information is in DataBindings.cpx, but how to find it programatically?
2). How to determine which View Objects from the AM's are used on the page? I know this is in the PageDef, but again, how to do this programatically?
Thanks for any ideas?
Regards,
John