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Sunday, February 12, 2017

AngularJS - Ajax

AngularJS provides $https: control which works as a service to read data from the server. The server makes a database call to get the desired records. AngularJS needs data in JSON format. Once the data is ready, $https: can be used to get the data from server in the following manner −

function studentController($scope,$https:) {
var url = "data.txt";

   $https:.get(url).success( function(response) {
      $scope.students = response; 
   });
}
Here, the file data.txt contains student records. $https: service makes an ajax call and sets response to its property students. students model can be used to draw tables in HTML.

Examples

data.txt

[
   {
      "Name" : "Mahesh Parashar",
      "RollNo" : 101,
      "Percentage" : "80%"
   },
 
   {
      "Name" : "Dinkar Kad",
      "RollNo" : 201,
      "Percentage" : "70%"
   },
 
   {
      "Name" : "Robert",
      "RollNo" : 191,
      "Percentage" : "75%"
   },
 
   {
      "Name" : "Julian Joe",
      "RollNo" : 111,
      "Percentage" : "77%"
   }
]

testAngularJS.htm

<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 = "studentController">
      
         <table>
            <tr>
               <th>Name</th>
               <th>Roll No</th>
               <th>Percentage</th>
            </tr>
         
            <tr ng-repeat = "student in students">
               <td>{{ student.Name }}</td>
               <td>{{ student.RollNo }}</td>
               <td>{{ student.Percentage }}</td>
            </tr>
         </table>
      </div>
      
      <script>
         function studentController($scope,$https:) {
            var url = "data.txt";
         
            $https:.get(url).success( function(response) {
               $scope.students = response;
            });
         }
      </script>
      
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
      
   </body>
</html>

Output

To execute this example, you need 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.
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