Accelerated DOM Scripting with Ajax, APIs, and Libraries by Jonathan Snook, Stuart Langridge, Aaron Gustafson, Dan Webb

By Jonathan Snook, Stuart Langridge, Aaron Gustafson, Dan Webb

If you're an online developer with past JavaScript and DOM scripting event, Accelerated DOM Scripting with Ajax, APIs, and Libraries is ideal that you can take your wisdom to the following level.

This e-book is set JavaScript and utilizing the record item model—the conduit to the HTML rfile. This ebook isn't really approximately studying easy methods to software JavaScript from scratch. It starts off with the belief that you've performed a few JavaScript improvement sooner than and comprehend the JavaScript syntax. This publication builds on that wisdom to offer you a deeper realizing of DOM scripting and the way to use that on your initiatives. It makes use of this new knowing to explain what JavaScript libraries are and express you ways they are often utilized on your venture. The e-book also will clarify Ajax and the way top to devise and use it on your tasks. It explains the best way to construct basic animation gadgets for including stream to components at the web page. There are uncomplicated examples that show the thoughts used during the book.

JavaScript has visible a resurgence in reputation over the last few years, and with it has come an exploration of the ability of the language in addition to what it may do in the browser. This e-book will clarify recommendations new and old—such as closures, encapsulation, and inheritance—that many are utilizing and the way you could top practice them on your personal projects.

By analyzing this e-book, you will have a better knowing of ways JavaScript works and be capable of use complicated thoughts resembling closures and occasion delegation to construct extra versatile functions for the internet. You'll stroll away with a better appreciation for JavaScript libraries and the way they could simplify and accelerate your improvement. You'll even be capable of enforce Ajax successfully into your website, create lighting tricks, use JavaScript libraries, and understand how top to use those libraries for your projects.
<h3>What you’ll learn</h3> * the place CSS, HTML, and the DOM healthy into glossy scripting, and the way to exploit them jointly successfully
* Object-oriented programming recommendations for extra effective JavaScript coding
* tips on how to use JavaScript libraries equivalent to Prototype on your paintings
* find out how to construct powerful shape validation into your purposes utilizing Ajax
* how you can create mashups utilizing APIs
* tips on how to construct dynamic person interfaces
<h3>Who this booklet is for</h3>
This booklet is for newbie to intermediate builders, and have already got wisdom of HTML, CSS, and JavaScript.
<h3>Table of Contents</h3><ol> * The nation of JavaScript
* HTML, CSS, and JavaScript
* Object-Oriented Programming
* Libraries
* Ajax and knowledge alternate
* visible results
* shape Validation and JavaScript
* Case examine: FAQ Facelift
* A Dynamic aid method
</ol>

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Extra resources for Accelerated DOM Scripting with Ajax, APIs, and Libraries

Example text

Unfortunately, there isn’t a getElementsByClassName() in the specification. Since getting elements by their class name is an effective way to retrieve a set of elements, you’ll make your own function to do this. push(els[i]); return a; } This function takes two parameters: the node from which you want to search and the class name for which you want to search. It returns an array of elements with which you can iterate through. Taking a look at this function, first you create a regular expression object: var re = new RegExp('(^| )'+classname+'( |$)'); A regular expression is a syntax for doing string matching.

Qxd 9/6/07 7:55 PM Page 35 CHAPTER 2 ■ HTML, CSS, AND JAVASCRIPT XHTML. 0, for example, did not support the use of innerHTML when the document was served as XHTML. 1+ supports innerHTML with XHTML, though. innerHTML enables you to specify a string of HTML that will be parsed and inserted into the document. This can be an efficient way of inserting multiple elements, attributes, or text content. Let’s do a comparison. innerHTML = 'What are you looking at? " height="200" width="200">'; Not only is it less code but it also actually performs better in the browser.

DOM Tree Structures The DOM is represented as a tree structure. qxd 9/6/07 7:55 PM Page 27 CHAPTER 2 ■ HTML, CSS, AND JAVASCRIPT Figure 2-2 shows a graphical representation of how the preceding HTML looks to the DOM. Figure 2-2. A simple DOM tree diagram There are some additional subtleties to the DOM as well. For example, the DOM sees elements as node types, but an element is just one type of node. There are 12 different node types, most of which are more relevant to the XML folks. For those who work with HTML, there are only three types of nodes that are used regularly: elements, attributes, and text.

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