9DOM Scripting

WHAT YOU WILL LEARN IN THIS CHAPTER:                

  • Finding elements in the page
  • Creating and inserting elements into the page dynamically
  • Navigating the web page, travelling from one element to another
  • Changing elements’ style after they are loaded in the page
  • Animating elements by manipulating their positioning

WROX.COM CODE DOWNLOADS FOR THIS CHAPTER

You can find the wrox.com code downloads for this chapter at http://www.wiley.com/go/BeginningJavaScript5E on the Download Code tab. You can also view all of the examples and related files at http://beginningjs.com.

JavaScript’s primary role in web development is to interact with the user, to add some kind of behavior to your web page. JavaScript enables you to completely change all aspects of a web page after it’s loaded in the browser. What gives JavaScript this power over a web page is the document object model (DOM), a tree-like representation of the web page.

The DOM is one of the most misunderstood standards set forth by the World Wide Web Consortium (W3C), a body of developers who recommend standards for browser makers and web developers to follow. The DOM gives developers a way of representing everything on a web page so that it is accessible via a common set of properties and methods in JavaScript. By everything, we mean everything. You can literally change anything on the page: the graphics, tables, forms, style, and even text itself by altering a relevant DOM property with JavaScript.

The DOM should ...

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