XMLHttpRequest of ajax

Call function (Url ){
Var XML = new XMLHttpRequest ();
XML. onreadystatechange = function (){
If (XML. readyState = 4)
{
If (XML. status = 200)
{
// XML. responseText
}
Else
{
// XML. statusText
}
}
Else
{
// Loading data...
}
};
XML. open ("GET", Url );
XML. send (null );
}; Define XMLHttpRequest to adapt to different browsers // IE support
If (window. ActiveXObject &&! Window. XMLHttpRequest)
{
Window. XMLHttpRequest = function ()
{
Var msxmls = new Array ('msxml2. XMLHTTP.5.0 ', 'msxml2. XMLHTTP.4.0', 'msxml2. XMLHTTP.3.0 ', 'msxml2. xmlhttp', 'Microsoft. xmlhttp ');
For (var I = 0; I <msxmls. length; I ++)
{
Try
{
Return new ActiveXObject (msxmls [I]);
}
Catch (e)
{
}
}
Return null;
};
}

// Opera support
If (window. opera &&! Window. XMLHttpRequest)
{
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. _ defacharcharset = 'iso-8859-1 ';
This. _ getCharset = function ()
{
Var charset = _ defaultCharset;
Var contentType = this. getResponseHeader ('content-type'). toUpperCase ();
Val = contentType. indexOf ('charset = ');
If (val! =-1)
{
Charset = contentType. substring (val );
}
Val = charset. indexOf (';');
If (val! =-1)
{
Charset = charset. substring (0, val );
}
Val = charset. indexOf (',');
If (val! =-1)
{
Charset = charset. substring (0, val );
}
Return charset;
};

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. getResponseHeader = function (header)
{
Var ret = getAllResponseHeader (header );
Var I = ret. indexOf ('\ n ');
If (I! =-1)
{
Ret = ret. substring (0, I );
}
Return ret;
};

This. setRequestHeader = function (header, value)
{
This. _ headers [this. _ headers. length] = {h: header, v: value };
};

This. open = function (method, url, async, user, password)
{
This. method = method;
This. url = url;
This. _ async = true;
This. _ aborted = false;
This. _ headers = [];
If (arguments. length> = 3)
{
This. _ async = async;
}
If (arguments. length> 3)
{
Opera. postError ('xmlhttprequest. open ()-user/password not ororted ');
}
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 );
}
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 ();
}
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 (), this. _ getCharset ());
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, this. _ getCharset ()));
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 ':
Case 'msxml2. xmlhttp.3.0 ':
Case 'msxml2. xmlhttp.4.0 ':
Case 'msxml2. xmlhttp.5.0 ':
Return new XMLHttpRequest ();
}
Return null;
};
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