MCQ

AngularJS AJAX

AngularJS provides a $http service for reading data and remote servers. It is used to retrieve the desired records from a server.

AngularJS requires data in JSON format. Once the data is ready, $http gets the data form server in the following manner:

  function employeeController($scope,$http) {
var url = "data.txt";

   $http.get(url).success( function(response) {
      $scope.employees = response; 
   });
}

Here the file "data.txt" is employee's records. $http service makes an AJAX call and sets response to its property employees. This model is used to draw tables in HTML.

AngularJS AJAX Example

testAngularJS.htm

<!DOCTYPE html>
<html>
<head>
 <title>Angular JS Includes</title>
    <style>
         table, th , td {
            border: 1px solid grey;
            border-collapse: collapse;
            padding: 5px;
         }
         
         table tr:nth-child(odd) {
            background-color: #f2f2f2;
         }
         
         table tr:nth-child(even) {
            background-color: #ffffff;
         }
      </style>
   </head>
   <body>
      <h2>AngularJS Sample Application</h2>
      <div ng-app = "" ng-controller = "employeeController">
      
         <table>
            <tr>
               <th>Name</th>
               <th>Age</th>
               <th>Salary</th>
            </tr>
         
            <tr ng-repeat = "employee in employees">
               <td>{{ employee.Name }}</td>
               <td>{{ employee.Age }}</td>
               <td>{{ employee.Salary }}</td>
            </tr>
         </table>
      </div>
      
      <script>
         function employeeController($scope,$http) {
            var url = "data.txt";
         
            $http.get(url).success( function(response) {
               $scope.employees = response;
            });
         }
      </script>
      
      <script src = "http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
      
   </body>
</html>

Here the file data.txt contains the employee's record.

"data.txt" (employee's data in JSON format)

    [
   {
      "Name" : "Mahesh Sharma",
      "Age" : 25,
      "Salary" : "20000"
   },
	
   {
      "Name" : "Rohan Malik",
      "Age" : 20,
      "Salary" : "22000"
   },
	
   {
      "Name" : "Robert Petro",
      "Age" : 45,
      "Salary" : "67000"
   },
	
   {
      "Name" : "Jullia Roberts",
      "Age" : 21,
      "Salary" : "55000"
   }
]

To execute the above example, you have to deploy testAngularJS.htm and data.txt file to a web server.

Open the file testAngularJS.htm using the URL of your server in a web browser and see the result.

Output:

The result would look like this:

Table:

Name	Age	Salary
Mahesh Sharma	25	20000
Rohan Malik	20	22000
Robert Petro	45	67000
Jullia Roberts	21	55000

HTTP Service Methods

There are several shortcut methods of calling the $http service. In the above example, .get method of the $http service is used. Following are several other shortcut methods: