Reference error onnotification is not defined in p

Using Cordova (ionicframework+angularjs ) Build to use a push notifications requests for Android devices.When doing registration The successHandler() is fired with ('ok') message result! Why the onNotification() method is not fired any time??.

var pushNotification;
    document.addEventListener("deviceready", onDeviceReady, false);
    function onDeviceReady() {

        pushNotification = window.plugins.pushNotification;
        setupNotificationsForandroid();
    }
   //begin setup
    function setupNotificationsForandroid() {
     //  alert("inside setup");
        if ( device.platform == 'android' || device.platform == 'Android' || device.platform == "amazon-fireos" ){

            pushNotification.register(
            successHandler,
            errorHandler,
            {
                "senderID":"856763042820",
                "ecb":"onNotification"
            });
        } else {
            pushNotification.register(
            tokenHandler,
            errorHandler,
            {
                "badge":"true",
                "sound":"true",
                "alert":"true",
                "ecb":"onNotificationAPN"
            });
        }
    }
    function successHandler(result){

        //alert("success"+result);

    }
    function errorHandler(){

        alert("error");
    }
    // Android
    function onNotification(e) {
        //alert("inside onnotification");
        switch( e.event )
        {
        case 'registered':
              if ( e.regid.length > 0 ){
               //set up the server call for storing registraion ids
                 alert(e.regid);
              }

        break;

        case 'message':
                // if this flag is set, this notification happened while we were in the foreground.
            if(e.foreground){
                var soundfile = e.soundname || e.payload.sound;
                var my_media = new Media("android/assets/www/"+ soundfile);
                my_media.play();
            }else{
               // otherwise we were launched because the user touched a notification in the notification tray.
            }


            break;

        case 'error':
               console.log("Error"+e.msg);
               break;

        default:
            console.log("An unknown event");
            return;
      }
    }

Here is my console message:

09-22 11:38:46.151: I/Web Console(24662): processMessage failed: Stack: ReferenceError: onNotification is not defined
09-22 11:38:46.151: I/Web Console(24662):     at eval (eval at processMessage (file:///android_asset/www/cordova.js:1006:26), <anonymous>:1:1)
09-22 11:38:46.151: I/Web Console(24662):     at processMessage (file:///android_asset/www/cordova.js:1006:13)
09-22 11:38:46.151: I/Web Console(24662):     at Function.androidExec.processMessages (file:///android_asset/www/cordova.js:1076:13)
09-22 11:38:46.151: I/Web Console(24662):     at pollOnce (file:///android_asset/www/cordova.js:944:17)
09-22 11:38:46.151: I/Web Console(24662):     at pollOnceFromOnlineEvent (file:///android_asset/www/cordova.js:939:5) at file:///android_asset/www/cordova.js:1045
09-22 11:38:46.151: D/CordovaLog(24662): file:///android_asset/www/cordova.js: Line 1046 : processMessage failed: Message: Jjavascript:onNotification({"regid":"APA91bHDLg9BZl-eicx3tS-MjVGy-mcufmbRc-EpCuKzb9b_tPddG125jyxY-OhVR5vul6az-eJ2nZ0PEiOVPqP2KjClaUwAKTBQx5gsIluI0jsGIrpCvNQdUbtKUBxNNH0DH94RHuGpjU29xhTS5Cl8qIgH1MlJHw","event":"registered"})

Based on this processMessage failed: Stack: ReferenceError: onNotification is not definedconsole message i think the problem with onNotification().Please help

onNotification must be have scope in window.