Re: Get return value of ajax event in Wicket 6.9.1

[Daniela L]

Hi,

I have tryed to change to AbstractDefaultAjaxBehavior like I described
below, but respond is never called. What am I doing wrong?


Hi,

as far as I have understood this can only be achieved, if I subclass
AbstractDefaultAjaxBehavior like this?

public class PageExitWarningBehavior extends AbstractDefaultAjaxBehavior  {
@Override
        protected void respond(AjaxRequestTarget target) {
                AppointmentSession.get().releaseSavedBlockedFreeCalendarEvent();
      }


Hi,

You need to make an Ajax call to the server.


On Mon, Nov 11, 2013 at 2:10 PM, Daniela L <danigal...@gmail.com>
<danigal...@gmail.com><danigal...@gmail.com> <danigal...@gmail.com>
wrote:


Hi,
this is my first question, so i hope I get everything right.

I am trying to catch the event of the user closing the browser window in
wicket.

I followed this example:
http://stackoverflow.com/questions/16527463/call-java-component-from-javascript-and-retreive-value

and I managed to get the example working so the message is displayed, but I
have no idea how to get the event triggered by the javascript function in
wicket. I need this because when the user closes the browser window I want
to update some data in my database.
Here is what I have tryed:


     RequiredTextField<String> myTextField = new
RequiredTextField<String>("myTextField");
     myTextField.setOutputMarkupPlaceholderTag(true);
     myTextField.add(new PageExitWarningBehavior(){
            @Override
            public void onEvent(Component component, IEvent<?> event)
            {
                //this isn't ever called
                MySession.get().releaseBlockedDataFromDatabase();
                }
        });

    public class PageExitWarningBehavior extends Behavior  {
        @Override
        public void renderHead(Component component, IHeaderResponse
response) {
            super.renderHead(component, response);
                    response.render(new
OnDomReadyHeaderItem("window.onbeforeunload = function (e) {"


                      + "Wicket.Ajax.get({u: '"+getCallbackUrl()+"', async:
false});"


                  + "var message = 'Your confirmation message goes
here.',"

                      + "e = e || window.event;" + "if (e) {"

                  + "e.returnValue = message;" + "}" + "return message;" +
"};"));
        }
    }

What am I missing? Thank you very much in advance