Ajaxing

AJAX Asynchronous event handling JavaScript guest expression XML record exchange with server AJAX 1 ajax and XMLHttpRequest ? The javascript XMLHttpRequest object is used to push a query to the server. ? ? ? must not be a third party server! The query can be anything (GET/POST/HEAD). The content comes back to the client (javascript) as an XML document. The client parses the XML and decides what to do (update part of the current HTML document, etc). AJAX 2 XMLHttpRequest ? inaugural introduced by MS as an ActiveX object ? ? Prior to this, MS had been promoting the use of Java for client-side networking. Netscape (and others) realised the potential and followed MS. There argon (of course) differences between how MS and everyone else supports this object. W3C is working on a measuring rod AJAX 3 Smarter customers ? ? ? With javascript networking capability, clients (web pages) can do more(prenominal). It is no longer fatal to f orce a complete document refresh every fourth dimension the user does anything. There are slightly important ajax applications: google maps, gmail and google suggest many another(prenominal) others AJAX 4 Programming with Ajax ? Client side: building an HTTP beg and sending it. receiving HTTP answer ? checking for errors including HTTP errors.

? Parsing HTTP reply (typically an XML document). modify HTML elements in the current page. Server side: Generating XML documents The authentic HTML comes from the server... AJAX 5 Creating an XMLHttpRequest Object ? For IE: http_request = bracing ActiveXOb ject(Msxml2.XMLHTTP); -or possibly- http_r! equest = new ActiveXObject(Microsoft.XMLHTTP); ? Netscape/Mozilla/Firefox/Safari: http_request = new XMLHttpRequest(); See AJAX: Getting Started for more details. AJAX 6 Some XMLHttpRequest Properties readyState: indicates that state of the transaction 0: uninitialized, 1:loading, ... 4 means done. onreadystatechange: the callback social part (async only)....If you want to get a full essay, order it on our website: BestEssayCheap.com

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