Pure javascript module to send an ajax get request. It works well on IE8+ and other modern browsers.

get_xhr.js

var GetXHR = (function() {
	var module = {};

	module.sendRequest = function(url, callback) {
	var req;
		
        if (window.XDomainRequest) {
			req = new XDomainRequest();
			if (!req) return;
			req.onload = function(){
				callback(JSON.parse(req.responseText));
			}
			req.open("get", url);
			req.send();
		} else {
			req = new XMLHttpRequest();
			if (!req) return;
			req.onload = function(){
				callback(JSON.parse(req.response));
			}
			req.open("get", url, true);
			req.send();	
		}	
	}
	return module;

}());