AngularJS AJAX - $http
$http is an AngularJS service for reading data from remote servers.
AngularJS $http
The AngularJS $http service makes a request to the server, and
returns a response.
Example
Make a simple request to the server, and display the result in a header:
<div ng-app="myApp" ng-controller="myCtrl">
<p>Today's welcome
message is:</p>
<h1>{{myWelcome}}</h1>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl',
function($scope, $http) {
$http.get("welcome.htm")
.then(function(response) {
$scope.myWelcome
= response.data;
});
});
</script>
Try it Yourself »
Methods
The example above uses the .get method of the $http
service.
The .get method is a shortcut method of the $http service.
There are several shortcut methods:
.delete().get().head().jsonp().patch().post().put()
The methods above are all shortcuts of calling the $http service:
Example
var app = angular.module('myApp', []);
app.controller('myCtrl',
function($scope, $http) {
$http({
method : "GET",
url : "welcome.htm"
}).then(function mySuccess(response) {
$scope.myWelcome = response.data;
}, function myError(response)
{
$scope.myWelcome =
response.statusText;
});
});
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The example above executes the $http service with an object as an argument.
The object is specifying the HTTP method, the url, what to do on success, and what to do on failure.
Properties
The response from the server is an object with these properties:
.configthe object used to generate the request..dataa string, or an object, carrying the response from the server..headersa function to use to get header information..statusa number defining the HTTP status..statusTexta string defining the HTTP status.
Example
var app = angular.module('myApp', []);
app.controller('myCtrl',
function($scope, $http) {
$http.get("welcome.htm")
.then(function(response) {
$scope.content
= response.data;
$scope.statuscode
= response.status;
$scope.statustext
= response.statusText;
});
});
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To handle errors, add one more functions to the .then method:
Example
var app = angular.module('myApp', []);
app.controller('myCtrl',
function($scope, $http) {
$http.get("wrongfilename.htm")
.then(function(response) {
// First function handles success
$scope.content
= response.data;
}, function(response) {
// Second function handles error
$scope.content = "Something went wrong";
});
});
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JSON
The data you get from the response is expected to be in JSON format.
JSON is a great way of transporting data, and it is easy to use within AngularJS, or any other JavaScript.
Example: On the server we have a file that returns a JSON object containing
15 customers, all wrapped in array called records.
Click here to take a look at the JSON object.
Example
The ng-repeat directive is perfect for looping through an
array:
<div ng-app="myApp" ng-controller="customersCtrl">
<ul>
<li
ng-repeat="x in myData">
{{ x.Name + ', ' + x.Country }}
</li>
</ul>
</div>
<script>
var app = angular.module('myApp',
[]);
app.controller('customersCtrl',
function($scope, $http) {
$http.get("customers.php").then(function(response) {
$scope.myData
= response.data.records;
});
});
</script>
Try it Yourself »
Application explained:
The application defines the customersCtrl controller, with a
$scope and
$http object.
$http is an XMLHttpRequest object for requesting
external data.
$http.get() reads JSON data from
https://www.w3schools.com/angularjs/customers.php.
On success, the controller creates a property, myData,
in the scope, with JSON
data from the server.
