Controller receiving incomprehensible response from service

Question

Controller receiving incomprehensible response from service

Here is my service code:

'use strict';

    app
    .service('myService', function($http) {

        this.getJSON = function() {
            return $http.get('someUrl/dataForm').then(function(data){
                return data.result;
            });
        };
    });

In the controller, I am using the service as follows:

'use strict'
        app.controller('myController', function ($scope, myService) {

            myService.getJSON().then(function(data){
                $scope.myData =data;
            });
            console.log($scope.myData);
        });

Although the http call returns a JSON value successfully, the console log displays 'undefined' for the value of myData. Can anyone help me figure out what mistake I might be making?

javascript angularjs

Answer 1

Answer №1

Embed the console.log within

 myFunction.getData().then(function(result){
                $scope.data = result;
                console.log($scope.data);
 });

DEMO

Answer 2

Embed the console.log within

 myFunction.getData().then(function(result){
                $scope.data = result;
                console.log($scope.data);
 });

DEMO

Answer 3

Answer №2

To resolve this issue, make the following changes to your controller code:

'use strict'
    app.controller('myController', function ($scope, myService) {

        myService.getJSON().then(function(data){
            $scope.myData =data;
            console.log($scope.myData);
        });

    });

The reason for this problem is that the getJSON method is asynchronous, meaning the request does not wait for a response. Adding a console.log in the ".then" block will address this issue.

Furthermore, when using getJSON, you are utilizing the concept of "promises". For more information on this concept with $http, please refer to the following link:

https://docs.angularjs.org/api/ng/service/$http

Answer 4

To resolve this issue, make the following changes to your controller code:

'use strict'
    app.controller('myController', function ($scope, myService) {

        myService.getJSON().then(function(data){
            $scope.myData =data;
            console.log($scope.myData);
        });

    });

The reason for this problem is that the getJSON method is asynchronous, meaning the request does not wait for a response. Adding a console.log in the ".then" block will address this issue.

Furthermore, when using getJSON, you are utilizing the concept of "promises". For more information on this concept with $http, please refer to the following link:

https://docs.angularjs.org/api/ng/service/$http

Answer 5

Answer №3

Make sure to update the code in the controller section

'use strict';
app.service('myService', function($http) {
    this.fetchData = function() {
     return $http.get('someUrl/dataForm').then(function(response){
            return response.data;
        });
    };
});

controller

  'use strict'
   app.controller('myController', function ($scope, myService) {
        myService.fetchData().then(function(data){
            $scope.myData = data;
           console.log($scope.myData);
        });
    });

Answer 6

Make sure to update the code in the controller section

'use strict';
app.service('myService', function($http) {
    this.fetchData = function() {
     return $http.get('someUrl/dataForm').then(function(response){
            return response.data;
        });
    };
});

controller

  'use strict'
   app.controller('myController', function ($scope, myService) {
        myService.fetchData().then(function(data){
            $scope.myData = data;
           console.log($scope.myData);
        });
    });

Answer 7

Answer №4

$http.get() will return a promise object.
The promise object contains methods like then(), catch(), finally().
When successful, then() is called, and when there is an error, catch() is called.

Update your service to,

app.service('myService', function($http) {
  this.loadData = function() {
    return $http.get('someUrl/dataForm'); //returns a promise object
  };
});

and the controller to,

app.controller('myController', function($scope, myService) {
  var promise = myService.loadData();
  //then method gets called after resolving
  promise.then(function(data) {
    $scope.myData = data;
    console.log($scope.myData);
  });
});

Answer 8

$http.get() will return a promise object.
The promise object contains methods like then(), catch(), finally().
When successful, then() is called, and when there is an error, catch() is called.

Update your service to,

app.service('myService', function($http) {
  this.loadData = function() {
    return $http.get('someUrl/dataForm'); //returns a promise object
  };
});

and the controller to,

app.controller('myController', function($scope, myService) {
  var promise = myService.loadData();
  //then method gets called after resolving
  promise.then(function(data) {
    $scope.myData = data;
    console.log($scope.myData);
  });
});

Controller receiving incomprehensible response from service

Answer №1

Answer №2

Answer №3

Answer №4

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