Ti.App.addEventListener('saveClient', function(e){
// My code...
});

if(!checkeventlistener('saveClient')){
    Ti.App.addEventListener('saveClient', function(e){
           // My code...
        }); 
}

2 Answers

• Accepted Answer

  AFAIK, you can't. Consider also that objects may have multiple event listeners attached, so what you'd really need is a way to enumerate the listener(s) for a given object (or Ti.App in this case).

  I'd suggest you keep a global boolean in app.js similar to this:

  // in app.js:
  var bSaveClientAdded = false;
  
  // elsewhere:
  if(!bSaveClientAdded){
      Ti.App.addEventListener('saveClient', function(e){
             bSaveClientAdded = true;
             // My code...
          }); 
  }
  

  If you have numerous listeners, you could use an array to track them and create a function like your checkeventlistener to return whether or not it is in the array, and an addeventlistener you used to track the array.

• I know this post is a bit old, but thought I would share my solution. I find it's easiest to assign Ti.App event listeners as global object properties.

  Declare globals var somewhere in app.js

  var globals = {};
  

  And then in whatever file you are declaring a listener

  globals.myEventListener = Ti.App.addEventListener('myEventListener', _myEventListener);
  

  And then from anywhere, you can check if it's set

  if (!globals.MyEventListener) {
    alert('do some stuff');
  }