How to check internet connection in AngularJs - angularjs

Question

This is how I would check internet connection in vanilla javascript:
setInterval(function(){
if(navigator.onLine){
$("body").html("Connected.");
}else{
$("body").html("Not connected.");
}
},1000);
I have angular controllers and modules in my project. Where should I put the code above? It should be executed in global context and not be assigned to a certain controller. Are there some kind of global controllers maybe?

Answer 1

First of all, I advise you to listen to online/offline events.
You can do it this way in AnguarJS:
var app = module('yourApp', []);
app.run(function($window, $rootScope) {
$rootScope.online = navigator.onLine;
$window.addEventListener("offline", function() {
$rootScope.$apply(function() {
$rootScope.online = false;
});
}, false);
$window.addEventListener("online", function() {
$rootScope.$apply(function() {
$rootScope.online = true;
});
}, false);
});
NOTE: I am wrapping changing of root scope's variable in $apply method to notify Angular that something was changed.
After that you can:
In controlller:
$scope.$watch('online', function(newStatus) { ... });
In HTML markup:
<div ng-show="online">You're online</div>
<div ng-hide="online">You're offline</div>
Here is a working Plunker: http://plnkr.co/edit/Q3LkiI7Cj4RWBNRLEJUA?p=preview
Other solution could be to broadcast online/offline event. But in this case you need to initialize current status upon loading and then subscribe to event.

Answer 2

It's definitely not as nice, but you could just try an AJAX request to your web server; it'll either succeed or time out.
Also, the HubSpot/offline project looks really good.

Answer 3

Your options:
addEventListener on the window, document, or document.body.
setting the .ononline or .onoffline properties on document or
document.body to a JavaScript Function object.
specifying ononline="..." or onoffline="..." attributes on the tag in
the HTML markup
I will demonstrate the easiest.
In you controller
document.body.onoffline = function() {
alert('You are offline now');
$scope.connection = 'offline'
}
document.body.ononline = function() {
alert('You are online again');
$scope.connection = 'online'
}
Check $scope.connection variable before you try to send requests around.

Answer 4

For Angular 2+ you can use ng-speed-test:
Just install:
npm install ng-speed-test --save
Inject into your module:
import { SpeedTestModule } from 'ng-speed-test';
#NgModule({
...
imports: [
SpeedTestModule,
...
],
...
})
export class AppModule {}
Use service to get speed:
import {SpeedTestService} from 'ng-speed-test';
#Injectable()
export class TechCheckService {
constructor(
private speedTestService:SpeedTestService
) {
this.speedTestService.getMbps().subscribe(
(speed) => {
console.log('Your speed is ' + speed);
}
);
}
}