Ajax Dr Jim Briggs WEBP Ajax1. 2 Ajax Asynchronous JavaScript And XML Method of creating more interactive web applications Moves more of the application.

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Presentation transcript:

Ajax Dr Jim Briggs WEBP Ajax1

2 Ajax Asynchronous JavaScript And XML Method of creating more interactive web applications Moves more of the application to the client side "Ajax: A New Approach to Web Applications", Jesse James Garrett – / phphttp://adaptivepath.com/ideas/essays/archives / php

WEBP Ajax3 Ajax technologies XHTML (or HTML), CSS, for marking up and styling information. The Document Object Model (DOM) accessed with a client- side scripting language, especially ECMAScript implementations like JavaScript and JScript, to dynamically display and interact with the information presented. The XMLHttpRequest object to exchange data asynchronously with the web server. In some Ajax frameworks and in certain situations, an IFrame object is used instead of the XMLHttpRequest object to exchange data with the web server. XML is commonly used as the format for transferring data back from the server, although any format will work, including preformatted HTML, plain text, JSON and even EBML.

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Ajax support in JSF tag Three important attributes: –event: which one event should trigger action: blur, change, click, dblclick, focus, keydown, keypress, keyup, mousedown, mousemove, mouseout, mouseover, mouseup, select, valueChange click and valueChange are the defaults depending on the component –execute: which (several) components from the form should be updated on the server –render: which (several) components on the page should be updated after the request completes is default for is default for render WEBP Ajax8

Listener example The following code represents the someaction method in mybean public void someaction(AjaxBehaviorEvent event) { dosomething; } WEBP Ajax9