/**
* IE 5.5+, Firefox, Opera, Chrome, Safari XHR object
*
* @param string url
* @param object callback
* @param mixed data
* @param null x
*/
function ajax(url, callback, data, x) {
try {
x = new(this.XMLHttpRequest || ActiveXObject)('MSXML2.XMLHTTP.3.0');
x.open(data ? 'POST' : 'GET', url, 1);
x.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
x.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
x.onreadystatechange = function () {
x.readyState > 3 && callback && callback(x.responseText, x);
};
x.send(data)
} catch (e) {
window.console && console.log(e);
}
};
// https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest
// https://gist.github.com/jed/993585
// https://gist.github.com/Fluidbyte/5082377
// https://github.com/Xeoncross/kb_javascript_framework/blob/master/kB.js#L30
// https://gist.github.com/iwek/5599777
// http://msdn.microsoft.com/en-us/library/ms537505(v=vs.85).aspx#_id
// @todo look into lengthComputable for xhr.upload browsers
// http://stackoverflow.com/questions/11127654/why-is-progressevent-lengthcomputable-false
// http://stackoverflow.com/questions/10956574/why-might-xmlhttprequest-progressevent-lengthcomputable-be-false
// https://github.com/ForbesLindesay/ajax/blob/master/index.js
