Send data from a link function to a controller function within a directive, and then pass it to another directive

Is there a method for transferring an element from the link function to the controller function within a directive, and then passing it on to another directive as its element?

For example, consider the following directive:

angular.module('myApp').directive('parentDir', function() {
  return {
    restrict: 'E',
    link: function (scope, element, attributes) {
    element = //some HTML code
    },
    controller: function ($scope) {
      this.elem = function () {
        $scope.elem = element;
      }
    }
  }
});

Now, imagine we have another directive where we want to access the $scope.elem.

angular.module('myApp').directive('childDir', function() {
  return {
    restrict: 'E', 
    link: function (scop, elmn, attr){

    // HOW TO GET THE $scope.elem here as elmn ?
    elmn = $scope.elem ?

    }
  }
});

Is it feasible to pass the element into the $scope.elem and then to another directive?

Edit: Gratitude to those who provided assistance. I also discovered an alternative approach using a factory. You can find more information about it here

Answer №1

If you're trying to figure out how the child directive can access an element from the parent directive, there's a technique you can use for directive-to-directive communication. This involves the child directive gaining access to the parent directive's controller:

Parent Directive Example:

angular.module('myApp').directive('parentDir', function() {
  return {
    restrict: 'E',
    link: function (scope, element, attributes) {
       element = //some HTML code
    },
    controller: function ($scope, $element) {
      this.elem = function () {
          return $element;
      }
    }
  }
});

Child Directive Example:

angular.module('myApp').directive('childDir', function() {
  return {
    restrict: 'E', 
    require: '^parentDir',
    link: function (scop, elmn, attr, parentCtrl){    
         var parentElmn = parentCtrl.elem(); 
    }
  }
});

Answer №2

If you're looking to achieve a specific goal, the method you choose will vary. To access the parent controller from the child controller, using require and injecting the parent controller in the link function of the child is recommended.

Alternatively, if you only need to access the scope, setting scope to false in the child directive is an option. However, this approach may lead to confusion as your code becomes more intricate.

Here's an example showcasing a possible way to access the parent directive from the child directive (my preferred approach):

angular.module('app', [])
  .directive('parentDir', function() {
    return {
      restrict: 'E',
      template: '<div style="background: yellow">This is the parent dir and value is <strong>{{ val }}</strong><div ng-transclude></div></div>',
      transclude: true,
      replace: true,

      controller: function($scope, $element) {
        $scope.val = true;
        
        this.element = $element;

        this.updateVal = function(newVal) {
          $scope.val = newVal
        }
      }
    }
  })
  .directive('childDir', function() {
    return {
      restrict: 'E',
      require: '^parentDir',
      replace: true,
      template: '<div class="append" style="background: red; margin: 15px"><h5>This is the child dir</h5><button ng-click="change()">change parent scope</button></div>',
      link: function(scope, element, attr, parentCtrl) {

        // accessing the parent element
        var parentElem = parentCtrl.element;

        // executing a function in the parent directive
        scope.change = function() {
          parentCtrl.updateVal(!scope.val)
        }
      }
    }
  });
<html ng-app='app'>

<head>
  <script src='https://code.angularjs.org/1.3.15/angular.js'></script>
  <script src='script.js'></script>
</head>

<body>
  <parent-dir>

    <child-dir>

    </child-dir>

  </parent-dir>
</body>

</html>

I hope this explanation helps clarify things for you.

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