Navigating through certain JSON information in AngularJS

I am facing a challenge with handling article information stored in a json file, where each article has a unique id. The format of the json data is as follows:

[{"title":"ISIS No. 2 killed in US special ops raid",
      "id":"14589192090024090",
      "agency":"foxnews",
      "text":"Article text goes here.",
      "topic":"Politics",
      "imagePath":"resources\/images\/foxnews\/14589192090024090.img.jpg"},
     {"title":", etc etc }]
    

On my main page, I have a list view that displays the title and author of each article. When a user clicks on an article, I want to show detailed information such as the text, topic, etc. In order to retrieve the json data, I utilize the following AngularJS factory:

var trooNewsServices = angular.module('trooNewsServices', ['ngResource']);

      trooNewsServices.factory('Articles', ['$resource',
      function($resource){
        return $resource('resources/articles.json');
      }]);
    

To access the full list of articles in my home page controller, I use the following code:

this.articles = Articles.query();
    

My current struggle lies in displaying the selected article's information on the next page. I aim to achieve this by retrieving the specific id using $routeParams.id and then locating the corresponding article in the json data. Below is a snippet from my selected article controller:

TrooNews.controller('ArticleController', ['$routeParams','Articles',
        function($routeParams, Articles) {

            //look through articles for specific article using routeparams
            Articles.query().$promise.then(function(articles) {

                for(i = 0; i < articles.length; i++){

                    if(articles[i].id===$routeParams.id){
                        this.selectedArticle=articles[i];
                    }

                }

            });

            console.log(selectedArticle);
    }]);
    

However, I encounter an error stating 'Could not instantiate controller ArticleController'. Is there a way to access the selectedArticle variable outside the promise function?

Answer №1

RevolutionNews.controller('PostController', ['$routeParams','Posts',
    function($routeParams, Posts) {
       var controller = this;
       controller.selectedPost = null;
       controller.setSelectedPost = function(post){
          controller.selectedPost = post;
       }
       //search for specific post using route parameters
       Posts.query().$promise.then(function(posts) {
          for(j = 0; j < posts.length; j++){
            if(posts[j].id===$routeParams.id){
                controller.setSelectedPost(posts[j])
                break;
            }
        }
    }); 
}]);

Answer №2

When making an asynchronous call, it's important to remember that the results may not be available immediately after the call. You can use a callback method like this:

Articles.query().then(function(allArticles){

    for(let i = 0; i < allArticles.length; i++){
        if(allArticles[i].id === id){
            selectedArticle = allArticles[i];
        }
    }

    console.log(selectedArticle);
})

Alternatively, you can trigger a scope digest within the callback itself.

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