Revealing an Angular directive's functionality to a different module

Question

Revealing an Angular directive's functionality to a different module

Imagine having a module with a directive structured as follows (this is a rough, untested implementation) There are 3 fundamental requirements that need to be fulfilled:

Set up configuration for the element display
Add event listeners accessible by the base controller
Create public methods that can be invoked by the base controller

angular.module("componentModule",[]) .directive("myComp",function(){

return{
    replace:true,
    template:'<h2>This is my component</h2>',
    scope:{config= "@"},
    link:function(scope,element,attr){
        this.deleteElement = function(id){
        //implementing code to delete this component
        //You can call this API function to remove it
    }
    if (!scope.config.visible){
        //element configuration object
        this.visible(false)}
    }
} })

Then in the main HTML file, include the directive like this:

<div myComm="first" config="eleConfig"></myComp>
<div myComm="second" config="newEleConfig"></myComp>

A separate controller is used for handling the main HTML:

angular.module("baseApp",['componentModule'])
 .controller('baseCtrl',function(){
    $scope.eleConfig = {
      visible:true,
      delete:function(e){
        //This function will run when the delete method is called 
        } 
     }
    //Call the delete method like this:
    $scope.first.deleteElement();
  })

Inquiry How can we trigger the deleteElement() method in the baseCtrl similar to how KENDO UI operates?

javascript angularjs

Answer 1

Answer №1

Angular follows a pattern of exposing the directive API to the scope in order for directives like ng-model and ng-form to make use of ngModelController and ngFormController APIs.

This is how I would approach it:

angular.module("componentModule",[])
 .directive("myComp",function($parse){
    return{
        replace:true,
        scope: {
            config: '&'
        },
        template:'<h2>This is my component</h2>',
        controller: function($scope) {
            // Add Directive API functions to the directive controller here or in the link function if needed for DOM manipulation
        },
        link:function(scope,element, attr, ctrl){
            // Add to directive controller

            if(scope.config().visible) {
                // Element should be visible, etc.
            }

            ctrl.deleteElement = function(){
                // Call the config.delete method when this function is invoked:

                if(scope.config && scope.config.delete) {
                    // Invoke the config.delete method by calling scope.config()
                    scope.config().delete(element);
                }
            }

            if(attr.myComp) {
                // Assign controller to $parent scope
                scope.$parent[attr.myComp] = ctrl;
            }
        }
      }
   })

If used with markup like:

<div my-comp="first" config="configObject"></div>
<div my-comp="second" config="configObject"></div>

In your base controller:

$scope.first.deleteElement();

or

$scope.second.deleteElement();

will delete the corresponding element.

UPDATE:

The directive has been updated based on your revised question. You can now pass a config object into the directive using an & binding. Since the directive creates a new scope, remember to attach the controller to $scope.$parent.

Answer 2

Angular follows a pattern of exposing the directive API to the scope in order for directives like ng-model and ng-form to make use of ngModelController and ngFormController APIs.

This is how I would approach it:

angular.module("componentModule",[])
 .directive("myComp",function($parse){
    return{
        replace:true,
        scope: {
            config: '&'
        },
        template:'<h2>This is my component</h2>',
        controller: function($scope) {
            // Add Directive API functions to the directive controller here or in the link function if needed for DOM manipulation
        },
        link:function(scope,element, attr, ctrl){
            // Add to directive controller

            if(scope.config().visible) {
                // Element should be visible, etc.
            }

            ctrl.deleteElement = function(){
                // Call the config.delete method when this function is invoked:

                if(scope.config && scope.config.delete) {
                    // Invoke the config.delete method by calling scope.config()
                    scope.config().delete(element);
                }
            }

            if(attr.myComp) {
                // Assign controller to $parent scope
                scope.$parent[attr.myComp] = ctrl;
            }
        }
      }
   })

If used with markup like:

<div my-comp="first" config="configObject"></div>
<div my-comp="second" config="configObject"></div>

In your base controller:

$scope.first.deleteElement();

or

$scope.second.deleteElement();

will delete the corresponding element.

UPDATE:

The directive has been updated based on your revised question. You can now pass a config object into the directive using an & binding. Since the directive creates a new scope, remember to attach the controller to $scope.$parent.

Answer 3

Answer №2

When it comes to your initial requirement, you mentioned the desire to write the delete function within the directive. However, with KendoUI, the actual implementation of the delete (change) function takes place in the base controller. The delete (change) event is triggered when the component value changes, leading to the execution of the delete function defined in the base controller by the directive. If you aim to emulate the behavior seen in KendoUI, then consider this:

Check out this plunker example

By turning on the browser console, you can view the log. In KendoUI components, the change event occurs automatically when the input element is altered. Nonetheless, in this scenario, I manually initiated the delete event after a 3-second delay.

Answer 4

When it comes to your initial requirement, you mentioned the desire to write the delete function within the directive. However, with KendoUI, the actual implementation of the delete (change) function takes place in the base controller. The delete (change) event is triggered when the component value changes, leading to the execution of the delete function defined in the base controller by the directive. If you aim to emulate the behavior seen in KendoUI, then consider this:

Check out this plunker example

By turning on the browser console, you can view the log. In KendoUI components, the change event occurs automatically when the input element is altered. Nonetheless, in this scenario, I manually initiated the delete event after a 3-second delay.

Revealing an Angular directive's functionality to a different module

Answer №1

Answer №2

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