1 function Network() {

     2     /**

     3      * The last known Network status.

     4      */

     5 	this.lastReachability = null;

     6 };

     7 

     8 Network.prototype.isReachable = function(hostName, successCallback, options) {

     9 	var req = new XMLHttpRequest();  

    10    	req.open('GET', hostName, true);  

    11    	req.onreadystatechange = function (aEvt) {  

    12      	if (req.readyState == 4) {  

    13         	if(req.status == 200)  

    14         		successCallback(NetworkStatus.REACHABLE_VIA_CARRIER_DATA_NETWORK);

    15          	else  

    16           		successCallback(NetworkStatus.NOT_REACHABLE);

    17  		}  

    18   	};  

    19   	req.send(null);

    20 

    21 };

    22 

    23 /**

    24  * This class contains information about any NetworkStatus.

    25  * @constructor

    26  */

    27 function NetworkStatus() {

    28 	this.code = null;

    29 	this.message = "";

    30 }

    31 

    32 NetworkStatus.NOT_REACHABLE = 0;

    33 NetworkStatus.REACHABLE_VIA_CARRIER_DATA_NETWORK = 1;

    34 NetworkStatus.REACHABLE_VIA_WIFI_NETWORK = 2;

    35 

    36 if (typeof navigator.network == "undefined") navigator.network = new Network();