What is the best way to invoke a Service from a Directive in AngularJS?

Question

What is the best way to invoke a Service from a Directive in AngularJS?

Every time a user clicks, a directive is triggered to change the icon for adding to their favorite list.

View:

<div class="col col-33">
    <i class="icon ion-ios-heart-outline" favorite="place[0].objectId" on-icon="ion-ios-heart-outline" off-icon="ion-ios-heart" icon-switcher /></i>{{place[0].likes}}
  </div>

Directive:

.directive('iconSwitcher', function() {

   return {
restrict : 'A',
    scope: {
  favorite: '='
},
link : function(scope, elem, attrs, PlaceService) {

  var currentState = true;

  elem.on('click', function() {
            console.log('objectId',scope.favorite);
    if(currentState === true) {
      angular.element(elem).removeClass(attrs.onIcon);
      angular.element(elem).addClass(attrs.offIcon);
    } else {
      angular.element(elem).removeClass(attrs.offIcon);
      angular.element(elem).addClass(attrs.onIcon);
    }

    currentState = !currentState

  });


}
       };});

I would like to make a service call from this directive when the click event occurs, similar to how it is done from a controller. Here is an example of the service I want to invoke

$scope.addFavorite = function(objectId){
PlaceService.addFavorite(objectId,currentUser)

javascript angularjs

Answer 1

Answer №1

One important thing to note is that Angular does not automatically inject a service into the link function. You will need to manually inject your service into the directive and then use it just like you would in a controller.

.directive('iconSwitcher', ['PlaceService', function(PlaceService) {

   // Here is where you can utilize PlaceService as a simple service

   return {
      restrict : 'A',
      scope: {
        favorite: '='
      },
      link : function(scope, elem, attrs) {

         var currentState = true;

         elem.on('click', function() {
             console.log('objectId',scope.favorite);
             if(currentState === true) {
                angular.element(elem).removeClass(attrs.onIcon);
                angular.element(elem).addClass(attrs.offIcon);
             } else {
               angular.element(elem).removeClass(attrs.offIcon);
               angular.element(elem).addClass(attrs.onIcon);
             }

         currentState = !currentState;

       })

     };
 ]})

Answer 2

One important thing to note is that Angular does not automatically inject a service into the link function. You will need to manually inject your service into the directive and then use it just like you would in a controller.

.directive('iconSwitcher', ['PlaceService', function(PlaceService) {

   // Here is where you can utilize PlaceService as a simple service

   return {
      restrict : 'A',
      scope: {
        favorite: '='
      },
      link : function(scope, elem, attrs) {

         var currentState = true;

         elem.on('click', function() {
             console.log('objectId',scope.favorite);
             if(currentState === true) {
                angular.element(elem).removeClass(attrs.onIcon);
                angular.element(elem).addClass(attrs.offIcon);
             } else {
               angular.element(elem).removeClass(attrs.offIcon);
               angular.element(elem).addClass(attrs.onIcon);
             }

         currentState = !currentState;

       })

     };
 ]})

Answer 3

Answer №2

When working with Angular, it's important to remember that dependencies are not injected directly into the link function. Instead, they need to be included in the function declaration of the directive itself:

angular.directive('myDirective', function(myService) {
    return {
        // ...
        link: function(...) {
            myService.updateData(dataId, newData);
        }
    }
});

Answer 4

When working with Angular, it's important to remember that dependencies are not injected directly into the link function. Instead, they need to be included in the function declaration of the directive itself:

angular.directive('myDirective', function(myService) {
    return {
        // ...
        link: function(...) {
            myService.updateData(dataId, newData);
        }
    }
});

What is the best way to invoke a Service from a Directive in AngularJS?

Answer №1

Answer №2

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