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 earlier JavaScript and DOM scripting adventure, Accelerated DOM Scripting with Ajax, APIs, and Libraries is ideal that you can take your wisdom to the following level.

This booklet is set JavaScript and utilizing the record item model—the conduit to the HTML record. This e-book isn't really approximately studying how one can software JavaScript from scratch. It starts off with the idea that you've performed a few JavaScript improvement earlier than and comprehend the JavaScript syntax. This booklet builds on that wisdom to provide you a deeper realizing of DOM scripting and the way to use that for your tasks. It makes use of this new knowing to explain what JavaScript libraries are and express you ways they are often utilized on your undertaking. The e-book also will clarify Ajax and the way most sensible to plot and use it on your initiatives. It explains the right way to construct uncomplicated animation gadgets for including move to components at the web page. There are straight forward examples that display the options used in the course of the book.

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

By studying this ebook, you'll have a better knowing of the way JavaScript works and have the capacity to use complicated innovations resembling closures and occasion delegation to construct extra versatile purposes 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 in a position to enforce Ajax successfully into your web site, 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 smooth scripting, and the way to take advantage of them jointly successfully
* Object-oriented programming ideas for extra effective JavaScript coding
* how you can use JavaScript libraries reminiscent of Prototype on your paintings
* the way to construct potent shape validation into your purposes utilizing Ajax
* find out how to create mashups utilizing APIs
* the right way to construct dynamic person interfaces
<h3>Who this ebook is for</h3>
This publication is for amateur to intermediate builders, and have already got wisdom of HTML, CSS, and JavaScript.
<h3>Table of Contents</h3><ol> * The country 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 procedure
</ol>

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You can apply different element styles, depending on which elements they are contained within. qxd 20 9/6/07 7:55 PM Page 20 CHAPTER 2 ■ HTML, CSS, AND JAVASCRIPT #main h2 { color:red; } #sidebar h2 { color:blue; } The header in main will be red, whereas the header in the sidebar will be blue—despite the fact that it is the same type of element being selected in each case. Specificity With the capability to declare styles with different types of selectors, a set of rules has been defined to determine the importance of certain declarations over others.

If you had used three class selectors (level C) in a ruleset, and a second ruleset had two class selectors (also level C), the first ruleset would have higher specificity than the second. • More importantly, a selector at a higher level has higher specificity than a number at a lower level. If you had a ruleset with an id selector (level B) and a second ruleset with three class selectors (level C) and an element selector (level D), the first ruleset would have higher specificity than the second.

The DOM tree diagram, with the attribute and text nodes added As you can see, that tree structure just got a few more branches. Keep in mind—and this is important—that even the space between tags is represented by a text node. IE, in its usual desire to be different, doesn’t recognize that blank space as a node. When you get to traversing the DOM, you’ll need to keep this browser difference in mind (discussed later in this chapter). The document Object Now that you know what the DOM is, let’s have a look at how you use it (using the document object, of course).

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