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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