$emit not working while emit data from one controller to another controller in angularjs

Question

I try to call function while emit data from one controller to another in AngularJS. But it doesn't work for me in Angular v.1.2. I need to call ctrl1 function from ctrl2 . Anyone can give me some idea for this issue?

Sample code:

    <div ng-contorller="ctrl">
      <div ng-contorller="ctrl1">
      </div>
      <div ng-contorller="ctrl2">
      </div>
    </div>

function parentctrl(){

}
function ctrl1($scope){
 $scope.callfn = function(){
 console.log("success");
}
 $scope.$on('emitdata', function(event, data){
    $scope.callfn();
 })
}
function ctrl2($scope){       
 $scope.$emit('emitdata', {'key':'uu'});
}

Answer 1

Or you could use both emits and broadcasts. Child scopes emits, parents broadcast. Like so: http://plnkr.co/edit/pjGIHByzkwCeNiaVrdb6?p=preview

app.controller("ctrl", function($scope) {
  $scope.$on('emitdata', function(event, data) {
    // This event will reach: ctrl -> ctrl1 + ctrl2
    $scope.$broadcast('broadcast-data', data);
  });
});

app.controller("ctrl1", function($scope) {
  $scope.$on('broadcast-data', function(event, data) {
    $scope.received = data;
  })
});

app.controller("ctrl2", function($scope) {
  $scope.emit = function() {
    // This event will reach: ctrl2 -> ctrl -> rootScope
    $scope.$emit('emitdata', {'key': 'uu'}); 
  };
});

Answer 2

$emit propagates events upwards, meaning that the emitting controller should be inside the listening controller.

<div ng-controller="ctrlone">
    <div ng-controller="ctrltwo">
        <!-- ctrltwo is the emitting controller
             ctrlone is the listening controller -->
    </div>
</div>

Now if there are two controllers that are on the same level like this:

<div ng-controller="parent">
    <div ng-controller="ctrlone">
        <!-- i listen for an event -->
    </div>
    <div ng-controller="ctrltwo">
        <!-- i raise an event -->
    </div>
</div>

There is no direct way for ctrlone to communicate with ctrltwo and vice versa. What you can do in this situation is to use $rootScope.$broadcast instead of emit :

function ctrltwo($rootScope) {
    $rootScope.$broadcast('myEvent', {'key':'uu'});
}

function ctrlone($scope) {
    $scope.$on('myEvent', function(event, data){
        $scope.callfn();
    });
}

You can also use $scope.$parent instead of $rootScope , but be careful when doing this, because this may stop working if the controller nesting changes.

Answer 3

This is how ctrl2 function should look:

function ctrl2($scope, $rootScope) {
    $rootScope.$broadcast('emitdata', {'key':'uu'});
}

$emit is to send up, $broadcast is to send down. $rootScope is at the top.