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hi after searching in the net about how to use the long polling in JavaScript I ended up with three ways, they are mentioned here briefly,but they are implemented using JQuery. I am confused which one to use in case that the AJAX request that I send to the server is asynchronous GET request ,and I don't know how many time it could take.

here is an example AJAX request:

function asynchGETRequest(method,url){ var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { console.log("ok"); } }; xhttp.open(method, url, true); xhttp.send(); return (xhttp.responseText); } var clientFunctions={ getAnswers : function(callback){ var res=asynchGETRequest("GET", "http://localhost:9000/answers"); callback(JSON.stringify(res)); } } clientFunctions.getAnswers (function(){ //do some code here after the ajax request is ended });

can some one guide me please?

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I think I found the solution here 

function loadFile(sUrl, timeout, callback){ var args = arguments.slice(3); var xhr = new XMLHttpRequest(); xhr.ontimeout = function () { console.error("The request for " + url + " timed out."); }; xhr.onload = function() { if (xhr.readyState === 4) { if (xhr.status === 200) { callback.apply(xhr, args); } else { console.error(xhr.statusText); } } }; xhr.open("GET", url, true); xhr.timeout = timeout; xhr.send(null); }
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