  /**//*
Cross-Browser XMLHttpRequest v1.1
=================================
Emulate Gecko 'XMLHttpRequest()' functionality in IE and Opera. Opera requires
the Sun Java Runtime Environment <http://www.java.com/>.
by Andrew Gregory
http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/
This work is licensed under the Creative Commons Attribution License. To view a
copy of this license, visit http://creativecommons.org/licenses/by/1.0/ or send
a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305,
USA.
Not Supported in Opera
----------------------
* user/password authentication
* responseXML data member
Not Fully Supported in Opera
----------------------------
* async requests
* abort()
* getAllResponseHeaders(), getAllResponseHeader(header)
 */
 // IE support
if (window.ActiveXObject && !window.XMLHttpRequest)  {
  window.XMLHttpRequest = function() {
return new ActiveXObject((navigator.userAgent.toLowerCase().indexOf('msie 5') != -1) ? 'Microsoft.XMLHTTP' : 'Msxml2.XMLHTTP');
 };
}
// Gecko support
/**//* ;-) */
// Opera support
global_fakeOperaXMLHttpRequestSupport = false;
//if (window.opera && !window.XMLHttpRequest) { THIS IS COMMENTED OUT BECAUSE OPERA 8 has window.XMLHttpRequest but still does not support setRequestHeader
if (window.opera) {
global_fakeOperaXMLHttpRequestSupport = true;
window.XMLHttpRequest = function() {
this.readyState = 0; // 0=uninitialized,1=loading,2=loaded,3=interactive,4=complete
this.status = 0; // HTTP status codes
this.statusText = '';
this._headers = [];
this._aborted = false;
this._async = true;
this.abort = function() {
this._aborted = true;
};
this.getAllResponseHeaders = function() {
return this.getAllResponseHeader('*');
};
this.getAllResponseHeader = function(header) {
var ret = '';
for (var i = 0; i < this._headers.length; i++) {
if (header == '*' || this._headers[i].h == header) {
ret += this._headers[i].h + ': ' + this._headers[i].v + '\n';
}
}
return ret;
};
this.setRequestHeader = function(header, value) {
this._headers[this._headers.length] = {h:header, v:value};
};
this.open = function(method, url, async, user, password) {
//alert(method+"]["+url+"]["+async+"]["+user+""+""+"");
this.method = method;
this.url = url;
this._async = true;
this._aborted = false;
if (arguments.length >= 3) {
this._async = async;
}
if (arguments.length > 3) {
// user/password support requires a custom Authenticator class
opera.postError('XMLHttpRequest.open() - user/password not supported');
}
this._headers = [];
this.readyState = 1;
if (this.onreadystatechange) {
this.onreadystatechange();
}
};
this.send = function(data) {
if (!navigator.javaEnabled()) {
alert("XMLHttpRequest.send() - Java must be installed and enabled.");
return;
}
if (this._async) {
setTimeout(this._sendasync, 0, this, data);
// this is not really asynchronous and won't execute until the current
// execution context ends
} else {
this._sendsync(data);
}
}
this._sendasync = function(req, data) {
if (!req._aborted) {
req._sendsync(data);
}
};
this._sendsync = function(data) {
this.readyState = 2;
if (this.onreadystatechange) {
this.onreadystatechange();
}
// open connection
var url = new java.net.URL(new java.net.URL(window.location.href), this.url);
var conn = url.openConnection();
for (var i = 0; i < this._headers.length; i++) {
conn.setRequestProperty(this._headers[i].h, this._headers[i].v);
}
this._headers = [];
if (this.method == 'POST') {
// POST data
conn.setDoOutput(true);
var wr = new java.io.OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
wr.close();
}
// read response headers
// NOTE: the getHeaderField() methods always return nulls for me :(
var gotContentEncoding = false;
var gotContentLength = false;
var gotContentType = false;
var gotDate = false;
var gotExpiration = false;
var gotLastModified = false;
for (var i = 0; ; i++) {
var hdrName = conn.getHeaderFieldKey(i);
var hdrValue = conn.getHeaderField(i);
if (hdrName == null && hdrValue == null) {
break;
}
if (hdrName != null) {
this._headers[this._headers.length] = {h:hdrName, v:hdrValue};
switch (hdrName.toLowerCase()) {
case 'content-encoding': gotContentEncoding = true; break;
case 'content-length' : gotContentLength = true; break;
case 'content-type' : gotContentType = true; break;
case 'date' : gotDate = true; break;
case 'expires' : gotExpiration = true; break;
case 'last-modified' : gotLastModified = true; break;
}
}
}
// try to fill in any missing header information
var val;
val = conn.getContentEncoding();
if (val != null && !gotContentEncoding) this._headers[this._headers.length] = {h:'Content-encoding', v:val};
val = conn.getContentLength();
if (val != -1 && !gotContentLength) this._headers[this._headers.length] = {h:'Content-length', v:val};
val = conn.getContentType();
if (val != null && !gotContentType) this._headers[this._headers.length] = {h:'Content-type', v:val};
val = conn.getDate();
if (val != 0 && !gotDate) this._headers[this._headers.length] = {h:'Date', v:(new Date(val)).toUTCString()};
val = conn.getExpiration();
if (val != 0 && !gotExpiration) this._headers[this._headers.length] = {h:'Expires', v:(new Date(val)).toUTCString()};
val = conn.getLastModified();
if (val != 0 && !gotLastModified) this._headers[this._headers.length] = {h:'Last-modified', v:(new Date(val)).toUTCString()};
// read response data
var reqdata = '';
var stream = conn.getInputStream();
if (stream) {
var reader = new java.io.BufferedReader(new java.io.InputStreamReader(stream));
var line;
while ((line = reader.readLine()) != null) {
if (this.readyState == 2) {
this.readyState = 3;
if (this.onreadystatechange) {
this.onreadystatechange();
}
}
reqdata += line + '\n';
}
reader.close();
this.status = 200;
this.statusText = 'OK';
this.responseText = reqdata;
this.readyState = 4;
if (this.onreadystatechange) {
this.onreadystatechange();
}
if (this.onload) {
this.onload();
}
} else {
// error
this.status = 404;
this.statusText = 'Not Found';
this.responseText = '';
this.readyState = 4;
if (this.onreadystatechange) {
this.onreadystatechange();
}
if (this.onerror) {
this.onerror();
}
}
};
};
}
// ActiveXObject emulation
if (!window.ActiveXObject && window.XMLHttpRequest) {
window.ActiveXObject = function(type) {
switch (type.toLowerCase()) {
case 'microsoft.xmlhttp':
case 'msxml2.xmlhttp':
return new XMLHttpRequest();
}
return null;
};
}
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