Microsoft Dot Net Master: AngularJS

Monday, March 9, 2015

AngularJS - Ajax

AngularJS provides $http 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, $http can be used to get the data from server in the following manner:

function studentController($scope,$http) {
var url="data.txt";
   $http.get(url).success( function(response) {
                           $scope.students = response; 
                        });
}

Here, the file data.txt contains student records. $http 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($scope,$http) {
var url="data.txt";
   $http.get(url).success( function(response) {
                           $scope.students = response;
                        });
}
</script>
<script src="http://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.