Is there any way to check reachability test of server in jQuery

Question

Is there any way to check reachability test of server .If application not able to connect server then it show a alert? is there any thing method to check.. I check the internet connection .If there is no connection then i am showing a alert .But if there is an connection but there is no reachability of server than how can i handle this.? I am checking like this connection status..!!

setInterval(function () {
    connectionStatus = navigator.onLine ? 'online' : 'offline';
    if(connectionStatus=="offline"){
        // alert("There is no connection");
    }
}, 100);



$.ajax({url: "192.168.12.171",
        dataType: "jsonp",
        statusCode: {
            200: function (response) {
                alert('status 200');
            },
            404: function (response) {
                alert('status  404 ');
            }
        }                        
 });

Fugue

I don't think the selected answer is correct. It works only when status is 200. – Hakenkreuz

Answer 1

To test if your server is up you will need to connect to it and check status massage:

$.ajax('LINK GOES HERE', {
  statusCode: {
    404: function() {
      alert('Not working');
    },
    200: function() {
      alert('Working');
    }
  }
});

Working jsFiddle example: http://jsfiddle.net/Gajotres/PMrDn/47/

$.ajax({url: "http://api.themoviedb.org/2.1/Movie.search/en/json/23afca60ebf72f8d88cdcae2c4f31866/The Goonies",
        dataType: "jsonp",
        statusCode: {
            200: function (response) {
                alert('status 200');
            },
            404: function (response) {
                alert('status  404 ');
            }
        }                        
 });

EDIT :

Use this:

$.ajax({url: "http://192.168.12.171",
        type: "HEAD",
        timeout:1000,
        statusCode: {
            200: function (response) {
                alert('Working!');
            },
            400: function (response) {
                alert('Not working!');
            },
            0: function (response) {
                alert('Not working!');
            }              
        }
 });

Working example: http://jsfiddle.net/Gajotres/PMrDn/48/

Nitrous

wait checking ..tell you after 5 min..!! – Fugue

when i am using your code it show code 200 ok.But when i give my ip then i am facing problem .I am getting data from server .But alert say not connected..:( – Fugue

I will write you a solution – Nitrous

Error 400 expects server, even if it is unreachable, status 0 will be thrown if nothing exist – Nitrous

let us continue this discussion in chat – Fugue

how do you hope the cross origin rule? – Assault

Several solutions exist, but in this case, it's the easiest one, jsonp is used instead of json. – Nitrous

Answer 2

One hacky way that should work would be to load an image (or font, style, javascript) from the server and check whether or not that image loads. This method would of course only work as long as there is something to load from the server that is not restricted by CORS policies.

Towbin