ERROR:- $http is undefined in Angular JS - angularjs

Question

I am getting an error for this piece of controller, $http is not defined. Please tell me what's missing..
define(
['activityFeedTimeStamp' ],
function(app) {
app.register
.controller(
'timeStampController',
[
'$scope',
'$rootScope',
function($scope, $rootScope) {
$http.get('http://localhost:7001/ebiz/ebizdashboard/activityfeed/updatetimestamp').
success(function(data, status, headers, config) {
// $('#timeStampVal').html(data.lastacesstime);
$('#timeStampVal').html(hiiiiiiiii);
}).
error(function(data, status, headers, config) {
$("#timeStamp").hide();
});
}]);
});

Answer 1

Inject "$http" into the controller like so:
.controller(
'timeStampController',
[
'$scope',
'$rootScope',
'$http', // need to inject $http into controller
function($scope, $rootScope, $http) {
Basically, any service you use (be it defined by you or built-in Angular one like $http) needs to be injected into a controller to be used.
Since you're using the minify-friendly controller syntax (which lists injections in both an array and the function parameters), you'll need to add it in both places.
See documentation:
https://docs.angularjs.org/guide/di
(Specifically the section "Inline Array Annotation")

Answer 2

I have gone through the same problem when I was using
myApp.controller('mainController', ['$scope', function($scope,) {
//$http was not working in this
}]);
I have changed the above code to given below. Remember to include $http(2 times) as given below.
myApp.controller('mainController', ['$scope','$http', function($scope,$http) {
//$http is working in this
}]);
and It has worked well.
source : https://stackoverflow.com/a/22125671/2439715

Answer 3

You havent injected a $http service in controller
app.register
.controller(
'timeStampController',
[
'$scope',
'$rootScope',
'$http'
function($scope, $rootScope,$http) {
$http.get('http://localhost:7001/ebiz/ebizdashboard/activityfeed/updatetimestamp').
success(function(data, status, headers, config) {
// $('#timeStampVal').html(data.lastacesstime);
$('#timeStampVal').html(hiiiiiiiii);
}).
error(function(data, status, headers, config) {
$("#timeStamp").hide();
});
}]);
});