// Mail Chimp AjaxRequest object constructor
// @Copyright © Copyright (c) 2010 Brent Laminack
// @license GNU/GPL http://www.gnu.org/copyleft/gpl.html
//
function MCAjaxRequest() {
	// Try the XMLHttpRequest object first
	if (window.XMLHttpRequest) {
		try {
			this.request = new XMLHttpRequest();
		} catch(e) {
			this.request = null;
		}
	// Now try the ActiveX (IE) version
	} else if (window.ActiveXObject) {
		try {
			this.request = new ActiveXObject("Msxml2.XMLHTTP");
		// Try the older ActiveX object for older versions of IE
		} catch(e) {
			try {
				this.request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch(e) {
				this.request = null;
			}
		}
	}

	// If the request creation failed, notify the user
	if (this.request == null)
		alert("Ajax error creating the request.\n" + "Details: " + e);
	}

	// Send an Ajax request to the server
	MCAjaxRequest.prototype.send = function(type, url, handler, postDataType, postData) {
	if (this.request != null) {
		// Kill the previous request
		this.request.abort();

		// Tack on a dummy parameter to override browser caching
		url += "?dummy=" + new Date().getTime();

		try {
			this.request.onreadystatechange = handler;
			this.request.open(type, url, true); // always asynchronous (true)
			if (type.toLowerCase() == "get") {
				// Send a GET request; no data involved
				this.request.send(null);
			} else {
				// Send a POST request; the last argument is data
				this.request.setRequestHeader("Content-Type", postDataType);
				this.request.send(postData);
			}
		} catch(e) {
			alert("Ajax error communicating with the server.\n" + "Details: " + e);
		}
	}
}	// end of MCAjaxRequest

MCAjaxRequest.prototype.getReadyState = function() {
	return this.request.readyState;
}

MCAjaxRequest.prototype.getStatus = function() {
	return this.request.status;
}

MCAjaxRequest.prototype.getResponseText = function() {
	return this.request.responseText;
}

MCAjaxRequest.prototype.getResponseXML = function() {
	return this.request.responseXML;
}