Invoking a parent controller method from a directive in AngularJS

Question

Invoking a parent controller method from a directive in AngularJS

I have utilized a tree grid plugin from the following link: https://github.com/khan4019/tree-grid-directive

and I made some customizations to its template:

.directive('treeGrid', [
    '$timeout', function($timeout) {
      return {
        restrict: 'E',
        template: 
          "<div class=\"table-responsive\">\
            <table id=\"policies\" class=\"table table-striped\">\
                <colgroup>\
                    <col width=\"10%\" />\
                    <col width=\"70%\" />\
                    <col width=\"1%\" />\
                    <col width=\"1%\" />\
                </colgroup>\
                <thead>\
                    <tr>\
                        <th>Category</th>\
                        <th>Content</th>\
                        <th></th>\
                        <th></th>\
                        <th></th>\
                    </tr>\
                </thead>\
                <tbody>\
                    <tr ng-repeat=\"row in tree_rows | filter:{visible:true} track by row.branch.uid\" ng-class=\"'level-' + {{ row.level }} + (row.branch.selected ? ' active':'')\">\
                    <td class=\"text-primary\"><a ng-click=\"user_clicks_branch(row.branch)\"><i ng-class=\"row.tree_icon\"ng-click=\"row.branch.expanded = !row.branch.expanded\"class=\"indented tree-icon\"></i></a>\
                    <span class=\"indented tree-label\" ng-click=\"user_clicks_branch(row.branch)\"> {{row.branch[expandingProperty]}}</span></td>\
                    <td ng-bind-html=\"row.branch[colDefinitions[2].field]\"></td>\
                    <td> <a href=\"javascript:void(0)\" ng-click=\"editContent(row.branch)\" data-toggle=\"modal\" data-target=\"#new-content\" class=\"action\"><i class=\"glyphicon glyphicon-edit\"></i></a> </td>\
                    <td> <a ng-click=\"deleteContent(row.branch.Id)\" class=\"action\"><i class=\"glyphicon glyphicon-remove-circle\"></i></a> </td>\
                    </tr>\
                </tbody>\
            </table>\
        </div>",
        replace: true,
        scope: {
          treeData: '=',
          colDefs:'=',
          expandOn:'=',
          onSelect: '&',
          deleteContent: '&',
          editContent: '&',
          initialSelection: '@',
          treeControl: '='
        },

In addition, I have defined the following controller:

.controller('ContentCtrl', ['$http', '$scope', '$location', '$localStorage', 'authService', 'settings', function ($http, $scope, $location, $localStorage, authService, settings) {

  $scope.deleteContent = function(){
      console.log("delete");

    };
  }]);

Furthermore, I have included this view:

<tree-grid tree-data="policies"></tree-grid>

However, when I click on the delete link, nothing happens. It seems like it is not triggering the controller scope functions.

What could be causing this issue? Did I make a mistake somewhere?

I am aware that implementing the functions directly in the directive would be a workaround but not an ideal solution. How can I resolve this issue effectively?

javascript angularjs angularjs-directive

Answer 1

Answer №1

To ensure the treeGrid directive can access the deleteContent, you must pass it through the template due to its isolate scope.

To rectify this issue, simply include the function when defining the directive in the template:

<tree-grid tree-data="policies" delete-content="deleteContent(branch)"></tree-grid>

The function has the ability to take any values defined on the current scope. In this case, it is taking branch. This value can be passed from the isolate scope by utilizing the following code snippet within the directive's template:

...
<td> <a ng-click=\"deleteContent({branch: row.branch})\" class=\"action\"><i class=\"glyphicon glyphicon-remove-circle\"></i></a> </td>\
...

Instead of solely passing the id, the entire branch is being passed in. This unique syntax is intended for directives that accept & isolate scope values and links the branch parameter (defined in the tree-grid directive) to the row.branch from the directive template. It is important to note that the property name "branch" inside tree-grid needs to correspond with the object used within the directive template (e.g. {branch: row.branch}).

For a visual representation of how deleteContent is passed to the directive, refer to this fiddle, which showcases logging to the console upon link click.

If the functionality remains static within the directive, an alternative approach would be to incorporate it into a link function:

Within the directive:

link: function (scope, element, attrs) {
   //...
   scope.deleteContent = function () {
       console.log("Content deleted");
   }
   //...
}

Answer 2

To ensure the treeGrid directive can access the deleteContent, you must pass it through the template due to its isolate scope.

To rectify this issue, simply include the function when defining the directive in the template:

<tree-grid tree-data="policies" delete-content="deleteContent(branch)"></tree-grid>

The function has the ability to take any values defined on the current scope. In this case, it is taking branch. This value can be passed from the isolate scope by utilizing the following code snippet within the directive's template:

...
<td> <a ng-click=\"deleteContent({branch: row.branch})\" class=\"action\"><i class=\"glyphicon glyphicon-remove-circle\"></i></a> </td>\
...

Instead of solely passing the id, the entire branch is being passed in. This unique syntax is intended for directives that accept & isolate scope values and links the branch parameter (defined in the tree-grid directive) to the row.branch from the directive template. It is important to note that the property name "branch" inside tree-grid needs to correspond with the object used within the directive template (e.g. {branch: row.branch}).

For a visual representation of how deleteContent is passed to the directive, refer to this fiddle, which showcases logging to the console upon link click.

If the functionality remains static within the directive, an alternative approach would be to incorporate it into a link function:

Within the directive:

link: function (scope, element, attrs) {
   //...
   scope.deleteContent = function () {
       console.log("Content deleted");
   }
   //...
}

Answer 3

Answer №2

If you're looking to expand your knowledge on AngularJS events, some key terms to explore are $broadcast(name, args);, $emit(name, args);, and $on(name, listener);.

Here's a potential solution for your issue:

Controller:

.controller('ContentCtrl', ['$http', '$scope', '$location', '$localStorage', 'authService', 'settings', function ($http, $scope,       $location, $localStorage, authService, settings) {

    $scope.deleteContent = function(){
        console.log("delete");
        $scope.$broadcast('deleteContentEvent',yourParams...);
    };
}]);

Directive:

.directive('treeGrid', [
    '$timeout','$rootScope', function($timeout,$rootScope) {
     $rootScope.$on('deleteContentEvent',function(event,yourParams...){
         // perform delete action
     });
     ...

Answer 4

If you're looking to expand your knowledge on AngularJS events, some key terms to explore are $broadcast(name, args);, $emit(name, args);, and $on(name, listener);.

Here's a potential solution for your issue:

Controller:

.controller('ContentCtrl', ['$http', '$scope', '$location', '$localStorage', 'authService', 'settings', function ($http, $scope,       $location, $localStorage, authService, settings) {

    $scope.deleteContent = function(){
        console.log("delete");
        $scope.$broadcast('deleteContentEvent',yourParams...);
    };
}]);

Directive:

.directive('treeGrid', [
    '$timeout','$rootScope', function($timeout,$rootScope) {
     $rootScope.$on('deleteContentEvent',function(event,yourParams...){
         // perform delete action
     });
     ...

Invoking a parent controller method from a directive in AngularJS

Answer №1

Answer №2

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