Download e-book for kindle: Build Your Own Ajax Web Applications by Matthew Eernisse

By Matthew Eernisse

ISBN-10: 0975841947

ISBN-13: 9780975841945

AJAX (Asynchronous JavaScript and XML) is a brand new procedure for constructing internet purposes. It primarily allows clients to have interaction with a website with no forcing a gradual & tedious reload of the total web page after each motion. this implies net functions turn into extra responsive, more straightforward to exploit, and extra intuitive. construct your individual Ajax net purposes makes use of a step by step instructional structure that is really easy to persist with, you could construct subtle and intuitive Ajax net interfaces very quickly! Get an outline of the fundamental applied sciences you will need to take advantage of to construct Ajax functions. comprehend the XMLHttpRequest item, the middle of Ajax functions. construct a cross-browser XMLHttpRequest wrapper for you to use in your entire Ajax tasks.

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Extra resources for Build Your Own Ajax Web Applications

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URL This parameter identifies the page being requested (or posted to if the method is POST). Crossing Domains Normal browser security settings will not allow you to send HTTP requests to another domain. com unless the user had allowed such requests. Asynchronous Flag If this parameter is set to true, your JavaScript will continue to execute normally while waiting for a response to the request. As the state of the request changes, events are fired so that you can deal with the changing state of the request.

DoTest = function() { // This will only work in Firefox, Opera and Safari. doTest(); So, what message is displayed? 1. message? ” But this has one small problem—its meaning changes when it’s called from outside the object. This is the result of something called execution context. info Processing the Response lers—runs in the calling object’s execution context. What this means is that, when you’re writing object-oriented JavaScript, you won’t be able to use the this keyword to refer to the object in code for event handlers (like onreadystatechange above).

Rush, Discovery It’s XMLHttpRequest that gives AJAX its true power: the ability to make asynchronous HTTP requests from the browser and pull down content in small chunks. Web developers have been using tricks and hacks to achieve this for a long time, while suffering annoying limitations: the invisible iframe hack forced us to pass data back and forth between the parent document and the document in the iframe, and even the “remote scripting” method was limited to making GET requests to pages that contained JavaScript.

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Build Your Own Ajax Web Applications by Matthew Eernisse

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