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