Incorporating Angular to dynamically fetch data through AJAX and fill in content post-page render

Question

Incorporating Angular to dynamically fetch data through AJAX and fill in content post-page render

As a backend API developer diving into AngularJS (version 1) for the first time with my current project, I have encountered a scenario that requires me to fetch server-side content dynamically post-render. The page is set up with ng-app="app" in the <html> tag and

ng-controller="BaseController as baseCtrl"

, rendering successfully.

The specific section of content (

{"status":"OK","id":"feed-whatsnew","content":"Unreliable source!"}

) needs to be loaded via ajax after initial render due to its unreliable and slow source. My challenge lies in using Angular to display this content within the specified

<div id="feed-whatsnew"> .. <div class="content"></div>..</div>

location and unhide it accordingly.

While Angular rendering logic is clear to me, secondary processes like this one remain somewhat mysterious. Although I would typically tackle this task with jQuery, I am determined to fully embrace the Angular framework rather than simply mimicking external libraries.

javascript angularjs ajax

Answer 1

Answer №1

If you are working with Angular, one way to make AJAX calls to an external API is by using the $http provider. Here's a sample code snippet demonstrating how you can achieve this:

app.controller('BaseController', ['$http', function($http){
    var vm = this;
    vm.content = {};

    vm.fetchContent = function(){
        return $http.get('/my-api-endpoint').then(function(response){
            vm.content = response.data;
        }, function(response){
            console.error('Failed calling /my-api-endpoint ', response);
        });
    };

    // Load content initially
    vm.fetchContent();
}]);

When you call $http.get(..), it initiates an asynchronous request to the specified URL and returns a Promise object. Once the request completes, the Promise resolves, triggering the callback function passed to then([callback]). This callback then updates the vm.content variable in your controller with the response data.

For more information on the $http provider, refer to the official documentation.

To display the fetched content in your UI, you can use something like:

<span>{{baseCtrl.content}}</span>

The actual implementation may vary depending on the nature of your content. It's recommended to separate the fetchContent() function into an Angular service for better maintenance and organization.

Answer 2

If you are working with Angular, one way to make AJAX calls to an external API is by using the $http provider. Here's a sample code snippet demonstrating how you can achieve this:

app.controller('BaseController', ['$http', function($http){
    var vm = this;
    vm.content = {};

    vm.fetchContent = function(){
        return $http.get('/my-api-endpoint').then(function(response){
            vm.content = response.data;
        }, function(response){
            console.error('Failed calling /my-api-endpoint ', response);
        });
    };

    // Load content initially
    vm.fetchContent();
}]);

When you call $http.get(..), it initiates an asynchronous request to the specified URL and returns a Promise object. Once the request completes, the Promise resolves, triggering the callback function passed to then([callback]). This callback then updates the vm.content variable in your controller with the response data.

For more information on the $http provider, refer to the official documentation.

To display the fetched content in your UI, you can use something like:

<span>{{baseCtrl.content}}</span>

The actual implementation may vary depending on the nature of your content. It's recommended to separate the fetchContent() function into an Angular service for better maintenance and organization.

Answer 3

Answer №2

AngularJS comes equipped with the powerful $http library for carrying out AJAX requests. For an easier understanding, refer to the documentation available at https://www.w3schools.com/angular/angular_http.asp

Outlined below are the logical steps:

Inject $http in the controller's dependencies.
Make a service call using $http.
Upon successful response, assign the data to the $scope variable to make it accessible in the UI/HTML elements. The assignment may vary if you are utilizing the controller as syntax in the markup.

angular.module('app', [])
  .controller('BaseController', function($http) {
    var vm = this;
    vm.feed = null;

    _getDataFromServer();

    function _getDataFromServer() {
      var req = {
        url: 'https://jsonplaceholder.typicode.com/posts/1',
        method: 'GET' //could be post/put etc
          //data: someJson -- if webservice need so
      };

      $http(req)
        .then(function(response) {
          vm.feed = response.data;
        }).catch(function(err) {
          console.log('some error occured!', err);
        });
    }
  });

<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.5.3/angular.min.js"></script>

<div ng-app="app" ng-controller="BaseController as vm">

  <p>Using $http</p>

  <div id="feed-whatsnew" ng-hide="!vm.feed">
    <!-- use {{}} or ng-bind to bind the data -->
    <!-- use ng-hide to show/hide the content conditionally -->
    Title from Ajax Response: {{vm.feed.title}}
    <div class="content">
      Content:
      <p ng-bind="vm.feed.body"></p>
    </div>

  </div>

</div>

Answer 4

AngularJS comes equipped with the powerful $http library for carrying out AJAX requests. For an easier understanding, refer to the documentation available at https://www.w3schools.com/angular/angular_http.asp

Outlined below are the logical steps:

Inject $http in the controller's dependencies.
Make a service call using $http.
Upon successful response, assign the data to the $scope variable to make it accessible in the UI/HTML elements. The assignment may vary if you are utilizing the controller as syntax in the markup.

angular.module('app', [])
  .controller('BaseController', function($http) {
    var vm = this;
    vm.feed = null;

    _getDataFromServer();

    function _getDataFromServer() {
      var req = {
        url: 'https://jsonplaceholder.typicode.com/posts/1',
        method: 'GET' //could be post/put etc
          //data: someJson -- if webservice need so
      };

      $http(req)
        .then(function(response) {
          vm.feed = response.data;
        }).catch(function(err) {
          console.log('some error occured!', err);
        });
    }
  });

<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.5.3/angular.min.js"></script>

<div ng-app="app" ng-controller="BaseController as vm">

  <p>Using $http</p>

  <div id="feed-whatsnew" ng-hide="!vm.feed">
    <!-- use {{}} or ng-bind to bind the data -->
    <!-- use ng-hide to show/hide the content conditionally -->
    Title from Ajax Response: {{vm.feed.title}}
    <div class="content">
      Content:
      <p ng-bind="vm.feed.body"></p>
    </div>

  </div>

</div>

Incorporating Angular to dynamically fetch data through AJAX and fill in content post-page render

Answer №1

Answer №2

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