XMLHttpRequest of Ajax_ajax related

Call

function (URL) {
var XML = new XMLHttpRequest ();
Xml.onreadystatechange = function () {
if (xml.readystate = 4)
{
if (Xml.status = 200)
{
Xml.responsetext
}
Else
{
Xml.statustext
}
}
Else
{
In Data Loading ...
}
};
Xml.open ("Get", URL);
Xml.send (NULL);
};

Define XMLHttpRequest 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._defaultcharset = ' 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 supported ');
}
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 on 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 (stream, This._getcharset ()) (new Java.io.InputStreamReader);
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 && windows. 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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