Having trouble fetching data using $http and promises in AngularJS

I'm having trouble connecting to my RESTful API within my AngularJS application. Despite my efforts, I'm not seeing any data being displayed on the screen.

It seems like I might be misunderstanding the usage of $http with promises. Any suggestions on what could be causing this issue?

This is the code snippet from my factory:

angular.module('mycompany.resources').factory('Forms', ['$http', '$q', function($http, $q) {
    var Forms = {};

    Forms.all = function() {
        var deferred = $q.defer();
        $http.get('/api/forms.json').then(function(response) {
            console.log(response.data);
            return response.data;
        });
        return deferred.promise;
    };

    return Forms;
}]);

And here's how my controller looks like:

angular.module('mycompany.admin.forms').controller('formListController', ['$scope', 'Forms', function($scope, Forms) {
    'use strict';

    $scope.forms = Forms.all();
}]);

Finally, here's a snippet from my template:

<div ng-controller="formListController">
    <ul class="form-list">
        <li ng-repeat="form in forms">
            <a class="form" href="#/forms/{{form._id}}">
                <span class="title">{{form.title}}</span>
                <span ng-if="form.lastPublished">Last published {{form.lastPublished | date:'M/d/yy'}}</span>
            </a>
        </li>
    </ul>
</div>

When I manually input data into the scope, it shows up without a problem:

angular.module('mycompany.admin.forms').controller('formListController', ['$scope', 'Forms', function($scope, Forms) {
    'use strict';

    $scope.forms = [
        {
            "_id": "530f69046c5a65ed1b5a3809",
            "archived": false,
            "lastPublished": new Date("2014-02-20 14:21:09 UTC"),
            "title": "New Student Registration (2014 - 2015)"
        }
    ];
}]);

After reviewing this example and this article, I believe that I should be able to utilize promises when fetching data using $scope.forms = Forms.all().

Answer №1

In my opinion, it would be beneficial to simplify your source code by making the following adjustments:

angular.module('mycompany.resources').factory('Forms', ['$http', '$q', ($http, $q) => {
    let Forms = {};

    Forms.all = () => {

      return $http.get('/api/forms.json');

    };

    return Forms;
}]);

angular.module('mycompany.admin.forms').controller('formListController', ['$scope', 'Forms', ($scope, Forms) => {
    'use strict';

     Forms.all().then((data) => { $scope.forms = data; });
}]);

Answer №2

In AngularJS 1.2, the automatic unwrapping of promises in view templates was removed.

To re-enable this feature, you can use $parseProvider.unwrapPromises(true), but keep in mind that this will eventually be deprecated, so it's recommended to adjust your patterns accordingly.

Forms.all = function($scope, binding) {
        return $http.get('/api/forms.json').then(function(response) {
            console.log(response.data);

            $scope[binding] = response.data;

            return response.data;
        });
    };


Forms.all($scope, 'forms');

http://docs.angularjs.org/guide/migration#templates-no-longer-automatically-unwrap-promises

Edit

Upon reviewing your factory code, it seems that you are unnecessarily creating a deferred object that is never resolved. Since $http.get already returns a promise, you can simply return that instead. Depending on your AngularJS version, you may only need to return the result of $http.get without rewriting the function to bind data to your scope.

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