Using AngularJS to make an $http request within a factory

I am trying to load a JSON file into a factory and retrieve its value.

Below is the code snippet:

angular.module('getGuilds', [])
    .factory('getGuilds', getGuilds);

getGuilds.$inject = ['$http'];

function getGuilds($http){
    var obj = {content:null};

    $http.get('guild/guilds.json').success(function(data) {
        obj.content = data;
    });

    return obj;
}

The issue I am facing is that it only returns an object with a null value, indicating that the $http.get function is not updating the value of obj.content.

To troubleshoot this problem, I conducted a small test:

    $http.get('guild/guilds.json').success(function(data) {
        obj.content = data;
    });

    console.log(obj)
    return obj;
}

Instead of the JSON array, the test outputted an object like this: {content:null}.

Subsequently, I moved the console.log statement inside the $http.get request.

$http.get('guild/guilds.json').success(function(data) {
     obj.content = data;
     console.log(obj)
});

Surprisingly, it displayed the contents of the JSON file in the logs. Can someone please assist me with resolving this issue?

Answer №1

The $http.get function executes the get request asynchronously. The code outside the success block is executed before the code inside the success block, leading to logging incomplete results on the first attempt.

Answer №2

The reason behind this is that $http.get function operates asynchronously. Therefore, when you were trying to assign the value, it was not available yet. To resolve this issue, you must return the object within your success function. Modifying your code as shown below should rectify the problem:

// Creating a dataservice factory
angular
 .module('getGuilds', [])
 .factory('dataservice', dataservice);

dataservice.$inject = ['$http'];

function dataservice($http) {
    return {
      getGuilds: getGuilds
    };

    function getGuilds() {
       return $http.get('guild/guilds.json')
        .then(getGuildsComplete)
        .catch(getGuildsFailed);

       function getGuildsComplete(response) {
        return response.data;
       }

       function getGuildsFailed(error) {
         console.log('XHR Failed for getGuilds.' + error.data);
       }
    }
}

In your controller, you can then utilize the dataservice as follows:

dataservice.getGuilds()
  .then(function(data) {
    vm.guilds = data;
    return vm.guilds;
  });

It's important to note that more code would be required in the controller for it to function properly. Nonetheless, the provided information should assist you in resolving the issue.

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