Add a javascript window to a Link when text input not saved

[liza6218]

Hi,

I'm trying to figure out the following, any help will be apreciated.

I have a form with 3 TextFields , a DropDownChoice and  a save button , 
and a BookmarkablePageLink in the page.  

I need to add a javascript confirm window to the Link whenever any input
changed without save (submit).
and remove the confirm window when the change is saved.


public aPage() {
        form = new Form("form");

        DropDownChoicequestion questions = new DropDownChoice("question", ...);
        form.add(questions);

        TextField answer1 = new RequiredTextField("answer1");
        TextField answer2 = new RequiredTextField("answer2");
        TextField answer3 = new RequiredTextField("answer3");

        form.add(answer1);
        form.add(answer2);
        form.add(answer3);

        form.add(new Button("save") {
            @Override
            public void onSubmit() {
                 saveChanges();
                 //remove the confirm window
            }
         }

        add(form);
        
        BookmarkablePageLink alink = new BookmarkablePageLink("alink",
LinkPage.class));
        add(alink);
}


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