9blue 9blue - 2 months ago 8
AngularJS Question

angularJS: How to call child scope function in parent scope

How can call a method defined in child scope from its parent scope?

function ParentCntl() {
// I want to call the $scope.get here
}

function ChildCntl($scope) {
$scope.get = function() {
return "LOL";
}
}


http://jsfiddle.net/wUPdW/

Answer

You can use $broadcast from the parent to a child:

function ParentCntl($scope) {

    $scope.msg = "";
    $scope.get = function(){
        $scope.$broadcast ('someEvent');
        return  $scope.msg;        
    }
}

function ChildCntl($scope) {               
    $scope.$on('someEvent', function(e) {  
        $scope.$parent.msg = $scope.get();            
    });

    $scope.get = function(){
        return "LOL";    
    }
}

Working fiddle: http://jsfiddle.net/wUPdW/2/

UPDATE: There is another version, less coupled and more testable:

function ParentCntl($scope) {
    $scope.msg = "";
    $scope.get = function(){
        $scope.$broadcast ('someEvent');
        return  $scope.msg;        
    }

    $scope.$on('pingBack', function(e,data) {  
        $scope.msg = data;        
    });
}

function ChildCntl($scope) {               
    $scope.$on('someEvent', function(e) {  
        $scope.$emit("pingBack", $scope.get());        
    });

    $scope.get = function(){
        return "LOL";    
    }
}

Fiddle: http://jsfiddle.net/uypo360u/