// returns an xmlhttp object
function _XMLHTTP() {
var rpc = null;
try {
rpc = new ActiveXObject('Msxml2.XMLHTTP');
}
catch (e) {
try {
rpc = new ActiveXObject('Microsoft.XMLHTTP');
}
catch (e) {
rpc = null;
}
}
if (!rpc && typeof XMLHttpRequest != 'undefinded') {
rpc = new XMLHttpRequest();
}
return rpc;
}
// used for remote procedural calls
function _rpc(url, div, form, callback, debug) {
// create rpc object;
var rpc = _XMLHTTP();
if (!rpc) {
document.location.href=url;
return false;
}
// notification when rpc is complete
rpc.onreadystatechange = function() {
if (rpc.readyState == 4) {
if (debug) {
alert('RPC DEBUG:\n' + rpc.responseText);
}
// parse xml and evaluate each response
response = rpc.responseText;
if (div) {
// put html into div
document.getElementById(div).innerHTML = response;
}
else if (callback) {
// user-defined callback function
eval(callback + '(response)');
}
else {
// run the script
try {
eval(response);
}
catch (e) {
newWin = window.open('');
newWin.document.write('');
newWin.document.write('RPC FAILED:
');
newWin.document.write(response);
newWin.document.write('');
}
}
}
}
// randomize url (so that no caching is done; headers don't seem to work properly)
url += ((url.indexOf('?') == -1) ? '?' : '&') + 'random=' + Math.random();
// send post or get
if (form) {
rpc.open('POST', url, true);
now = new Date();
rpc.setRequestHeader('lastCached', now.toUTCString());
rpc.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
// post all elements in form
var post = '';
for (var i = 0; i < form.elements.length; i++) {
if (form.elements[i].name != '') {
if (i != 0) {
post += '&';
}
post += form.elements[i].name + '=' + escape(form.elements[i].value);
}
}
rpc.send(post);
}
else {
// get url
rpc.open('GET', url, true);
rpc.send(null);
}
return false;
}