From Ajax to JQuery Ajax

AjaxArticle

XMLDocumentAnd XMLHttpRequestObject
1. Create an XMLHttpRequest request objectCopy to Clipboard reference content: [www.bkjia.com] function getXMLHttpRequest (){
Var xRequest = null;
If (window. XMLHttpRequest ){
XRequest = new XMLHttpRequest ();
} Else if (typeof ActiveXObject! = "Undefined "){
XRequest = new ActiveXObject ("Microsoft. XMLHTTP ");
}
Return xRequest;
}

Or:

Copy to ClipboardReference: [www.bkjia.com] var request = null;

Function createRequest (){

Try {

Request = new XMLHttpRequest (); // non-Microsoft IE browser

} Catch (trymicrosoft) {// Microsoft IE

Try {

Request = new ActiveXObject ("Msxml2.XMLHTTP ");

} Catch (othermicrosoft ){

Try {

Request = new ActiveXObject ("Microsoft. XMLHTTP ");

} Catch (failed ){

Request = null;

}

}

}

If (request = null)

Alert ("Error creating request object !");

}

This independent function for creating the XMLHttpRequest request object can be called.

Note:: XMlHTTP objects are not W3C standards. Therefore, you must consider the support of different browser environments when creating them.

The XMLHTTP object has 6 methods and 8 attributes. It supports two execution modes: synchronous and asynchronous.

XMLHTTP objectAttributeAndMethodList (from IXMLHTTPRequest Interface ):

Attribute name	Type	Description
Onreadystatechange	N/	Specifies the event processing function called when the ready status changes. It is only used for asynchronous operations.
ReadyState	Long	Asynchronous Operation Status: Not initialized (0), loading (1), loaded (2), InterAction (3), completed (4)
ResponseBody	Variant	Returns the response body as an unsigned byte array.
ResponseStream	Variant	Returns the response body as an ADO Stream object.
ResponseText	String	Returns the response body as a text string.
ResponseXML	Object	Resolve the response body to an XMLDocument object through XMLDom
Status	Long	HTTP status code returned by the server
StatusText	String	Server HTTP Response line status

Method Name	Description
Abort	Cancel current HTTP Request
GetAllResponseHeaders	Retrieve all header fields from the response information
GetResponseHeader	Obtain an HTTP header field value from the response body.
Open (method, url, boolAsync, bstrUser, bstrPassword)	Open a connection to the HTTP server
Send (varBody)	Send a request to the HTTP server. Body.
SetRequestHeader (bstrHeader, bstrValue)	Set the header field of a request

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