What is the best way to display data retrieved from a GET request in Angular?

Spending too much time on a development issue is causing me frustration. After extensive research, I find myself stuck at this point.

The problem lies in making a GET request from a service which is called by a controller.

Below is the code for the service responsible for the GET request, ajaxSrvc.js:

app.service('ajaxSrvc', ['$log', 'Constants', '$http', '$q', 
    function($log, Constants, $http, $q) {
        this.getAllTasks = function() {
            var defer = $q.defer();

            var url = 'http://localhost:9998/tasks';
            $http.get(url, {cache: 'true'})
                .success(function(data) {
                    defer.resolve(data);
                });

                return defer.promise;
        };
    }
]);

This GET request is triggered by the following controller, tasksCtrl.js:

app.controller('tasksCtrl', ["$log", "$scope", "Constants","$location", "ajaxSrvc",
    function($log, $scope, Constants, $location, ajaxSrvc) {
        var someData = null;
        ajaxSrvc.getAllTasks().then(function(data) {
            console.log(data);
            someData = data;
        });

        console.log(someData); // Outputting NULL
    }
]);

Despite my efforts, when trying to display someData, it only shows as NULL instead of the expected information from the GET request.

I am seeking guidance on resolving this issue. Any suggestions?

Answer №1

The issue at hand is the necessity to wait for the async function to complete its execution. Even when you use console.log(someData), the data is still being loaded within the async function. To address this, you can include a function call within the .then method, which will only execute once the loading process has finished.

If the value returned by console.log(data) meets your expectations, consider implementing the following structure:

app.controller('tasksCtrl', ["$log", "$scope", "Constants","$location", "ajaxSrvc",
    function($log, $scope, Constants, $location, ajaxSrvc) {
        var someData = null;
        ajaxSrvc.getAllTasks().then(function(data) {
            console.log(data);
            someData = data;
            callWhenFinish();
        });

        function callWhenFinish(){
            console.log(someData);
        }
    }
]);

Answer №2

The reason this code isn't functioning properly is due to its asynchronous nature. As a result, the console.log(someData) statement is executed before the data is actually retrieved, rendering it ineffective.

Answer №3

As the getAllTasks() function returns a promise, the someData will be logged first before the promise resolves. Instead of assigning the callback data directly to someData within the callback scope, it is better to pass the data to a separate function and handle it from there.

For Example:

 ajaxSrvc.getAllTasks().then(function(data) {

               doSomethingWithData(data);
        });

//Then

$scope.doSomethingWithData = function(data){

      $scope.someData = data;

      console.log($scope.someData);

}

I hope this explanation helps.

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