Streaming client for Javascript.

stream.js

// Streaming function for Javascript, wrapped as a jQuery function.
// @param url      URL of the receive.
// @param callback Callback function on when data is received. When no callback is
//                 provided, the received data will be written to console.log().
(function($) {
    $.Stream = function(url, callback) {
        var xhr = internalXHR();
        var length = 0;

        if (callback === undefined) { callback = function(text) { console.log(text); } }

        xhr.open('GET', url, true);
        xhr.onreadystatechange = function() {
            if (xhr.status == 200 && xhr.readyState >= 3) {
                var text = xhr.responseText;
                callback(text.substr(length, text.length - length));
                length = xhr.responseText.length;
            }
        }

        xhr.send(null);
        return this;
    };

    function internalXHR() {
        return (function(xhr, xObjects, i) {
            if (xhr) return new xhr();
            for (i = 0; i < xObjects.length; i++) {
                try { return new ActiveXObject(xObjects[i]); } catch (e) { }
            }
        })( window.XMLHttpRequest, ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP'] )
    };
}(jQuery));

// Based on http://stackoverflow.com/a/3957470