Angularjs : accessing service methods from directive's link function

Question

i have a directive, and in its link function i want to access methods from a service. My code for directive is

AppDirectives.directive('feed',['FeedService',function() {
return {
    restrict : 'AE',
    scope : {
        feedLike: '&',
        feedItem : '=',
        feedDislike :'&',
        feedsArray :'=',
    },
    templateUrl :'resources/views/templates/feedTemplate.html',

    link : function(scope,element,feedService){
        console.debug("linking now");
        scope.likeComment = function(commentUid){
            console.debug("comment liked :"+commentUid);
        };

        scope.addComment = function(referenceFeedUid){
            console.debug("commentText : "+scope.commentText);
            var comment = {
                    user : "guest",
                    feedText : scope.commentText
                };
            feedService.addComment(comment,referenceFeedUid).then(function(response){
                console.debug("response ; "+response);
            //  $scope.feeds.unshift(response);
            });
        };

    },
    replace : true,

};
}]);

and my service code is

.factory('FeedService',function($http){

return {
    postFeed : function (feed){
        /*$http.post('/feed/add',feed).success(function(response){
            console.debug("added "+response);
        }).error(function(){
            console.debug("error adding feed");
        });*/

        return $http.post('/feed/add',feed).then(function(response){
            return response.data;
        });

    },

    getFeeds : function(){
         return $http.get('/feed/get');
    },

    likeFeed : function(feedUid){
        return $http.get('/feed/'.concat(feedUid).concat('/like')).then(function(response){
            return response.data;
        });
    },

    dislikeFeed : function(feedUid){
        return $http.get('/feed/'.concat(feedUid).concat('/dislike')).then(function(response){
            return response.data;
        });
    }, 

    addComment : function (comment,referenceUid){
        var targetUrl = '/feed/'.concat(referenceUid).concat('/comment');

        return $http.post(targetUrl,comment).then(function(response){
            return response.data;
        });

    },

};
});

when i call the add comment from directive's link, i am getting following error on firebug console.

TypeError: Object #<Object> has no method 'addComment'
at Object.scope.addComment (http://localhost:8080/feed/resources/js/directives.js:53:21)
at http://localhost:8080/feed/resources/js/lib/angular/angular.js:6193:19
at http://localhost:8080/feed/resources/js/lib/angular/angular.js:12684:13
at Object.Scope.$eval (http://localhost:8080/feed/resources/js/lib/angular/angular.js:7840:28)
at Object.Scope.$apply (http://localhost:8080/feed/resources/js/lib/angular/angular.js:7920:23)
at HTMLButtonElement.<anonymous> (http://localhost:8080/feed/resources/js/lib/angular/angular.js:12683:17)
at http://localhost:8080/feed/resources/js/lib/angular/angular.js:1926:10
at Array.forEach (native)
at forEach (http://localhost:8080/feed/resources/js/lib/angular/angular.js:110:11)
at HTMLButtonElement.eventHandler (http://localhost:8080/feed/resources/js/lib/angular/angular.js:1925:5) 

here is my directive template

 <ul class="media-list">
 <li class="media">
    <a class="pull-left" href="#"><img class="media-object" src="resources/images/holder.png" style="height:64px; width:64px;" alt="img"></a>
    <div class="media-body">
           <span><h4 class="media-heading">{{feedItem.userUid}}</h4>{{ feedItem.time | date:medium }}</span>
          <h5>{{feedItem.feedText}}</h5><h3></h3>
        <p> <a ng-click="feedLike(feedItem.feedLike)">Like </a> {{feedItem.like}} 
            <a ng-click="feedDislike(feedItem.feeddisLike)">Dislike</a>                                   {{feedItem.dislike}} 
        </p>

         <div ng-repeat = "comment in (feedsArray | filter:{referenceGroupId:feedItem.uid})">
            <div class="media">
                <a class="pull-left" href="#"><img class="media-object" src="resources/images/holder.png" style="height:64px; width:64px;" alt="img"></a>
                <div class="media-body">
                    <span><h4 class="media-heading">{{comment.userUid}}</h4>{{ comment.time | date:medium }}</span>
                    <h5>{{comment.feedText}}</h5><h3></h3>
                    <p> <a ng-click="likeComment(comment.uid)">Like </a> {{comment.like}} 
                        <a ng-click="commentDislike(comment.uid)">Dislike</a>{{comment.dislike}} 
                    </p>
                </div>
            </div><br/>
        </div>

        <div>
            <input type="text" id="commentBox" ng-model="commentText"/>
            <button class="btn  btn-success" ng-click="addComment(feedUid)">Comment</button>
        </div> 
    </div>
</li>

</ul>

what i am trying to do is that i want to access the addCommennt method from service. how can i fix it or is there any way that i can acess the service methods from inside the directive link function.

Thanks in advance. regards,

Solution

Instead of declaring the service in the link function, declare it when you are defining the directive:

So here:

AppDirectives.directive('feed',['FeedService',function(feedService) {

Then the feedService will be available to call inside the link function. The link function parameters are specifically defined as scope, element, attrs, ctrl so there is no straight dependency injection happening there (AFAIK).

Comments

[Shahzeb Khan]

thank you so much for quick response. Its working fine now. Thanks again.

[Abdulraheem Abid]

Hi @ShahzebKhan. Your solution works perfectly. But I have a slightly different style of adding the link function like below: function mylink(scope, element, attrs){ myservice.mymethod() // can't access myservice here} function mydirective(myservice) { return { link: mylink, }; } How can i get access to the injected service in the link function if it is defined as above?

[Shahzeb Khan]

@AbdulraheemAbid Bro, it has been almost 6 years I haven't worked on angular. Would be better if you ask a new question and add this as reference.