Execute the Controllers function within an AngularJS Directive

Is there a way to invoke a controller's method within a directive in the code snippet provided below?

app.controller("main",['$scope','$http',function($scope,$http){
$scope.SelectCollege = function (){
     //Code to search college
}
}]);

Directive

angular.module('angucomplete', [] )
    .directive('angucomplete', function ($parse, $http, $sce, $timeout) {

        link: function($scope, elem, attrs) {
            $("#search_value").autocomplete({
                    source: $scope.localData,
                    select: function( event, ui ) {

                        //How can the controller's method be called from here?

                    }
                });
        }
});

Answer №1

To utilize your controller within a directive, you can use the directive property.

The controller option accepts either a string or a function. When a string is provided, it references a controller constructor function that has been registered elsewhere in the application:

angular.module('myApp', [])
   .directive('myDirective', function() {
   restrict: 'A', // always required
   controller: 'SomeController',
   link: function(scope, element, attrs, SomeController) {
         SomeController.doSomething(scope);
  },
})
   // The controller can be defined elsewhere in the application
   // either in the same file or in a different file included in index.html
angular.module('myApp')
  .controller('SomeController', function($scope, $element, $attrs, $transclude) {
      // Controller logic goes here
})

Answer №2

If the directive is located within the controller scope (inside an element with ng-controller)

select: function( event, ui ) {

   //To invoke a method from the controller
   //Solution: follow the example below
   $scope.SelectUniversity();

}

Answer №3

To include your controller's method in the directive's scope, you can do the following:

<autocomplete on-select="ChooseOption()"></autocomplete>

In the directive definition, specify the scope as follows:

scope: {
    onSelect: "&onSelect"
}

Then, to call the method within the directive, use:

 $scope.onSelect()

Another approach is to directly use $scope.ChooseOption() within the directive if the directive is placed within the controller's scope and the directive does not have its own scope but inherits from the controller's scope. For instance:

<div ng-controller="main">
    <autocomplete></autocomplete>
</div>

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