AngularJS Essentials

Chapter 5
When invoked, this function dispatches an event to all of its registered child scopes.
In order to receive and handle the desired broadcast, $scope needs to call the $on
function, thus informing you of the events you want to receive and also the functions
that will be handling it.
For this implementation, we are going to send the broadcast through the $rootScope
object, which means that the broadcast will affect the entire application.
In the following code, we created a service called TickGenerator. It informs
the current date every second, thus sending a broadcast to all of its children
(the services.js file):
parking.factory("tickGenerator", function($rootScope, $timeout) {
var _tickTimeout;
var _start = function () {
_tick();
};
var _tick = function () {
$rootScope.$broadcast("TICK", new Date());
_tickTimeout = $timeout(_tick, 1000);
};
var _stop = function () {
$timeout.cancel(_tickTimeout);
};
var _listenToStop = function () {
$rootScope.$on("STOP_TICK", function (event, data) {
_stop();
});
};
_listenToStop();
return {
start: _start,
stop: _stop
};
});
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