jQuery to check server availability

Question

I want to write a function for my website, which checks several web servers to see if they are online or not... I'm working with jQuery.ajax() I realized that I have to use JSONP, but i really dont know how to do that! I have an array of IP adresses and I want to check if the corresponding servers are available.

Here is my code so far:

function urlExists(url){

            $.ajax({
                timeout: 5000,
                type: 'GET',
                dataType: 'jsonp',
                url: "http://" + url,
                cache: false,
                "error":function(XMLHttpRequest,textStatus, errorThrown) {
                    if(errorThrown == "timeout") {
                        alert("woah, there we got a timeout...");
                        // At this point the request shall abort
                    }
                },
                statusCode: {
                    404:function(){
                        alert("404!");

                    },
                    0:function(){
                        alert("0!");

                    },
                    500:function(){
                        alert("500!");

                    },
                    200:function(){
                        alert("it worked!");

                    }
                }
            });
        }

        urlExists("192.168.5.55");

After that i want to save whether the webserver is online or not, but where?

Answer 1

You can use ajax complete event to check if all the links are tested or not

function urlExists(url){
    $.ajax({
        timeout: 5000,
        type: 'GET',
        dataType: 'jsonp',
        url: "http://" + url,
        cache: false,
        "error":function(XMLHttpRequest,textStatus, errorThrown) {
            if(errorThrown == "timeout") {
                result.push({
                'url': url,
                'status': "woah, there we got a timeout..."
            });
           // At this point the request shall abort
        }
    },
    complete: function(){
     // Handle the complete event
     if(result.length == list.length) {
            alert("All url's checked. Check the console for 'result' varialble");
        console.log(result);
        }
    },
    statusCode: {
        404:function(){
            result.push({
                'url': url,
                'status': "404!"
           });

        },
        0:function(){
            result.push({
                    'url': url,
                    'status': "0!"
                });
            },
            500:function(){
                result.push({
                    'url': url,
                    'status': "500"
               });
            },
            200:function(){
                result.push({
                    'url': url,
                    'status': "it worked!"
               });
            }
        }
    });
}
var result = new Array;
var list = ['192.168.5.55','192.168.98.99'];
for (var i = list.length - 1; i >= 0; i--) {
    urlExists(list[i]);
};

Answer 2

你必须调用一个php函数，你有url：“http：//”+ url，（url是你的控制器+方法），这里做验证状态并插入你的数据库

Answer 3

The only way to do this is involves a hackish solution like this: Is it possible to ping a server from Javascript?

Since you would like to save the results, I am going to assume you are using a server-side language such as PHP or ASP. I am familiar with PHP so I would recommend getting PHP to execute a PING command and figure out if the server is online or not based on that result.

EDIT

In regards to the first comment I would recommend implementing an httprequest instead of PING.