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AJAX :: Asynchronous Javascript And XML

AJAX is based on XMLHttpRequest

With this object we can assign actions to occur at specific properties like...

Properties of XMLHttpRequest

• onreadystatechange
• readyState
• responseText
• responseXML
• status
• statusText

Values for readyState

• 0 = Uninitialized ; 'open' is not yet called
• 1 = Loading ; 'send' for request is not yer called
• 2 = Loaded ; 'send' is called, headers & status are available
• 3 = interactive ; downloading response
• 4 = Completed ; finished downloading response

responseText

• Response as Text OR null if readyState < 3

responseXML

• Response as DOM document object OR null if readyState < 3

status

• Integer HTTP status code

statusString

• Status String

Methods of AJAX

Basic Methods

• open(method, url [,async]) - initializes a new HTTP request -method : GET, POST, PUT, DELETE -url : http url -async : true/false
• send(body) -Sends HTTP request
• abort() -Called after 'send' to cancel the request

Header Methods

• void setRequestHeader(name, value)
• String getResponseHeader(name)
• String getAllResponseHeaders()

Enjoy AJAXing !
ViRaL
(http://www.viralpatel.info/tutorials/)

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