Long Poll JS Patterns

basic.js

(function($) {
    var longPollUrl = '/longpoll';

    var lastReceivedSequence;

    function poll() {
        $.ajax(longPollUrl, {
            data: { 'lastSequence': lastReceivedSequence },
            dataType: 'json',
            timeout: 15000,
            success: function(data) {
                if (!data) return;
                lastReceivedSequence = data.sequenceNumber;
                $(window).trigger('onLongPollEvent', data);
            },
            complete: poll
        });
    }
})(jQuery);

full.js

(function($) {
    var longPollUrl = '/longpoll';

    var lastReceivedSequence;
    var serverVersion;

    function poll() {
        $.ajax(longPollUrl, {
            data: { 'lastSequence': lastReceivedSequence },
            dataType: 'json',
            timeout: 15000,
            success: function(data) {
                if (!data) return;
                lastReceivedSequence = data.sequenceNumber;
                if (data.serverVersion != serverVersion) {
                    window.location.reload();
                    return;
                }
                $(window).trigger('onLongPollEvent', data);
            },
            complete: poll
        });
    }
})(jQuery);

listener.js

$(window).bind('onLongPollEvent', function(eve, longPollData) { ... });

reload.js

var serverVersion;
...
if (data.serverVersion != serverVersion) {
    window.location.reload();
    return;
}
...