Book Image

Learning Ext JS

By : Colin Ramsay, Shea Frederick, Steve 'Cutter' Blades
Book Image

Learning Ext JS

By: Colin Ramsay, Shea Frederick, Steve 'Cutter' Blades

Overview of this book

<p>As more and more of our work is done through a web browser, and more businesses build web rather than desktop applications, users want web applications that look and feel like desktop applications. Ext JS is a JavaScript library that makes it (relatively) easy to create desktop-style user interfaces in a web application, including multiple windows, toolbars, drop-down menus, dialog boxes, and much more. Both Commercial and Open Source licenses are available for Ext JS.<br /><br />Ext JS has the unique advantage of being the only client-side UI library that also works as an application development library. Learning Ext JS will help you create rich, dynamic, and AJAX-enabled web applications that look good and perform beyond the expectations of your users.<br /><br />From the building blocks of the application layout, to complex dynamic Grids and Forms, this book will guide you through the basics of using Ext JS, giving you the knowledge required to create rich user experiences beyond typical web interfaces. It will also provide you with the tools you need to use AJAX, by consuming server-side data directly into the many interfaces of the Ext JS component library.</p>
Table of Contents (16 chapters)
15
Index

Accessing the DOM

Custom library adapters allow for the use of Ext JS with other libraries, say JQuery or Prototype. But Ext JS provides its own internal libraries for DOM manipulation as well.

Finding DOM elements

The first task when manipulating the DOM(Document Object Model) is to find what we're looking for. The DomQuery class provides us with several methods for this purpose, including returning entire groups of DOM nodes that meet specific criteria, or selecting a single node by its selector. We can even start the search from a specific node in the page. There are several different selector types that can be used when searching for a specific element:

  • base Element Selectors
  • Attribute Selectors
  • Pseudo Classes
  • CSS Value Selectors

What's more, we can chain together a series of selectors to find the exact element we're searching for:

var myEl = Ext.DomQuery.selectNode ('a.iconLnk[@href*="cutterscrossing"]:first');

This will return the first anchor element...