Simple JavaScript library which periodically checks internet connection and calls functions of your choice when the connection is dropped or restored. I'm very interested in feature requests so if you have one, please open an issue here: https://github.com/tdriley/checknet/issues

Include the checknet.min.js (found in the src/ folder) on each page you want to be able to detect internet connection on:

<script src="checknet.min.js"></script>

Somewhere after including the script, add your event listeners for 'dropped' and 'restored' to the Checknet object, passing in a function you want to call in each case:

Checknet.addEventListener('dropped', function(){
	//what should happen when the connection drops.
	console.log('dropped');
});

Checknet.addEventListener('restored', function(){
	//what should happpen when a dropped connection resumes.
	console.log('restored');
});

...and then set the check running by calling the start() method:

Checknet.start();

Note: The page you are running the code on must be served from the internet (running it locally will not detect dropped internet connection).

Takes two required params 'name' (string) and value (mixed types):

Checknet.set('checkInterval', 5000); 											//sets the interval in milliseconds between each check (default 3000, minimum 1000).
Checknet.set('checkUrls', ['http://asite.com', 'https://anothersite.co.uk']); 	//sets the array of URLs to check connection with.

Note on 'checkUrls': By default Checknet will use the current page URL. Any domains you add which are not the same as the one on which the code is r must be able to accept CORS requests (https://en.wikipedia.org/wiki/Cross-origin_resource_sharing) from the domain you are running the code on. Adding a new array will overwrite the existing one. The array can contain only one URL if you wish.

Returns a JS object containing useful info:

{
	conActive: true, 											//true if connection is active on last check, false if not.
	checkUrls: ['http://someurl.com', 'https:anotherurl.com'], 	//the current array of URLs which is being used to check there is a connection.
	checkInterval: 3000 										//the current interval in milliseconds between each check (default 3000).
}

If you want to modify the src/ files locally, clone or download the repo, navigate inside the 'checknet' folder and use npm to install the node modules required for building:

sudo npm install

...and then just type 'grunt' to build:

grunt