how does long polling work javascript?

Question

Hi I understand that in long polling you keep the connection with the server open for long till you a get a response back from the server and then poll again and wait for th

Answer 1

I was looking to do something with staggered data results where some would come back right away but the last few results might come back 10-15 seconds later. I created a quick little jQuery hack but it's kinda doing what I want (still not sure if it makes sense to use it tho):

(function($) {
    if (typeof $ !== 'function') return;
    $.longPull = function(args) {
        var opts = $.extend({ method:'GET', onupdate:null, onerror:null, delimiter:'\n', timeout:0}, args || {});
        opts.index = 0;
        var req = $.ajaxSettings.xhr();
        req.open(opts.method, opts.url, true);
        req.timeout = opts.timeout;
        req.onabort = opts.onabort || null;
        req.onerror = opts.onerror || null;
        req.onloadstart = opts.onloadstart || null;
        req.onloadend = opts.onloadend || null;
        req.ontimeout = opts.ontimeout || null;
        req.onprogress = function(e) {
            try {
                var a = new String(e.srcElement.response).split(opts.delimiter);
                for(var i=opts.index; i

Largely untested but it seemed to do what you had in mind. I can think of all sorts of ways it could go wrong, though ;-)

$.longPull({ url: 'http://localhost:61873/Test', onupdate: function(data) { console.log(data); }});