11 Answers

• Accepted Answer

  The fireEventsolution works for me on both iPhone and Android.
  In app.js:

  tabGroup.addEventListener('focus', function(e){
      if(e.index==1) {
          win2.fireEvent('youGotFocus', e);
      }
  });
  

  In tab2.js:

  var win = Titanium.UI.currentWindow;
  
  win.addEventListener('youGotFocus', function(e){
      Ti.API.info('Event handler in tab2.js called');
  });
  

• Just call the 'focus' event on the Tab.
  So:

  var tab = Ti.UI.createTab();
  tab.addEventListener('focus',function(){
      // do your thing here
  });
  

• From the few tabs interfaces I've used from Titanium, once the window is created with them, it stays created.

  This might be a dirty hack, but at the beginning of your tab2 code you could check to see if a Ti.App.Properties flag is set. If not, set it to something like "1", run your code, then at the end unset it.

  Kind of a dirty hack but it should work.

• call the code when the tab gets focus… you can listen for a focus event on a tabGroup and it will tell you which tab item is getting the focus

  http://developer.appcelerator.com/apidoc/mobile/latest/Titanium.UI.TabGroup-object

  that should do it.

• Thanks for the responses.

  Aaron Saunders, this is what I did first (mentioned in my first message). The problem is I want to put all the code in the tab2.js file (as it is an incluide file there would be no point having an include file otherwise). I want to do exactly what you said, but in the include file. I have tries to do this but can't get it to work.

  Josh Lewis, I see what you are saying, but I don't see how that would work. I still need to have some form of event for any code to run again, I think.

  A simple "if 'this' tab gets clicked again, then do xyz" would do it. (with 'this' being the tab2.js file and tab2/window2.

  Thanks again.

  Chris.

• The current window will get focus when the tab is displayed.
  You can use the following code in tab2.js:

  var win = Titanium.UI.currentWindow;
  
  win.addEventListener('focus', function (e) {
      Ti.API.info("Clicked on tab2");
  });
  

• All I need is to know how to detect when a certain tab is selected/viewed etc. But it must be code I can put in the tab2.js include, not in app.js.

• Thanks Peter, but I just can't get any of this to work.

  I can get fireEvent to work, but:
  (a) code must be still in app.js
  (b) it will only run once. Surely I still need the 'focus' event so it runs everytime the user re-opens the tab?

  Any ideas?

  Thanks.

• Perfect. Thanks Peter.

  I must have had things mixed up.

  Thanks again.

• Any ideas anyone?

• Have you tried to call win2.fireEvent() from app.js?
  It would be a few lines of trivial code in app.js, but all the logic in tab2.js