designoir

/**
 * function request
 * Copyright (C) 2006-2007 Dao Gottwald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Contact information:
 *   Dao Gottwald <dao at design-noir.de>
 *
 * @version 1.5
 * @url	    http://design-noir.de/webdev/JS/request/
 */

/*@cc_on @if (@_win32 && @_jscript_version >= 5) if (!window.XMLHttpRequest)
window.XMLHttpRequest = function() { return new ActiveXObject("Microsoft.XMLHTTP") }
@end @*/

function request(url, method, data, callback) {
	var http = new XMLHttpRequest;
	if (!http)
		return false;
	var _data;
	if (data != null && typeof data == "object") {
		_data = [];
		for (var i in data)
			_data.push(i + "=" + encodeURIComponent(data[i]));
		_data = _data.join("&");
	} else {
		_data = data;
	}
	method = method.toUpperCase();
	if (method == "POST") {
		http.open(method, url, true);
		http.setRequestHeader("Method", "POST "+url+" HTTP/1.1");
		http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	} else {
		if (_data)
			url += (url.indexOf("?") == -1 ? "?" : "&") + _data;
		_data = "";
		http.open(method, url, true);
	}
	if (callback)
		http.onreadystatechange = function() {
			if (http.readyState == 4) {
				http.onreadystatechange = function(){};
				callback(http);
			}
		};
	http.send(_data);
	return http;
}

function receiveIt (http) {
	if (http.status == 200)
		alert (http.responseText);
	else
		alert ('Request failed.');
}

if (!request ('whatever.php', 'POST', 'foo=bar&baz=qux', receiveIt))
	alert ('Request failed.');

request ('whatever.php', 'GET', {foo:'bar?',baz:'yet to encode'}, receiveIt);