ajax1-php (27)

A Brief introduction

Web program working schematic diagram:

The traditional Web program working principle diagram:

Ajax working principle diagram:

1. About Ajax

L Asynchronous asynchronous

L JavaScript

L and

L XML

Ajax is a technology that leverages JavaScript to interact with XML and server data

Xml:

Json:

2. Development history

L 1998 Births

L 2005 Popularity

3. Operating Platform

L Google Chrome

L Mozilla

L Firefox

L Internet Explorer

L Opera

L Konqueror

L Safari

Ii. Core Objects

XMLHttpRequest

First, create the object

Under different browsers, the way you create Ajax objects is slightly different.

IE under:

New ActiveXObject ("Microsoft.XMLHTTP")

Web Model Browser:

New XMLHttpRequest ()

5. Encapsulating Ajax

Calling code:

Third, Ajax object-related properties and methods:

1. Related methods:

L Open (Method,url)

Initializing an Ajax object

Method: Request mode post, get

URL: Request Resource address

L setRequestHeader (Header,value)

Set Request header information

Header: Head information

Value: Values

L Send (content)

Send Request

Content: The parameters passed are only required to be placed in the POST request.

2. Related attributes:

L ReadyState

The status code of the Ajax object, the status code will change at any time

0: Indicates that the object is established but not initialized

1: Indicates that the object has been initialized but not sent

2: The Send method has been called for request

3: Receiving data (Received part)

4: Receive complete

L onReadyStateChange

When the status code of an Ajax object changes, the callback function that is triggered

L Status

HTTP response Status Code

L StatusText

Text of the HTTP response

L ResponseText

Text of the HTTP response content

L Responsexml

XML data for HTTP response content

There are three main ways to pass Ajax object data:

Text:responsetext

Xml:reponsexml

Json:responsetext

The above describes the ajax1-php (27), including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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