Book Image

Ext JS 3.0 Cookbook

Book Image

Ext JS 3.0 Cookbook

Overview of this book

Using Ext JS you can easily build desktop-style interfaces in your web applications. Over 400,000 developers are working smarter with Ext JS and yet most of them fail to exercise all of the features that this powerful JavaScript library has to offer. Get to grips with all of the features that you would expect with this quick and easy-to-follow Ext JS Cookbook. This book provides clear instructions for getting the most out of Ext JS with and offers many exercises to build impressive rich internet applications. This cookbook shows techniques and "patterns" for building particular interface styles and features in Ext JS. Pick what you want and move ahead. It teaches you how to use all of the Ext JS widgets and components smartly, through practical examples and exercises. Native and custom layouts, forms, grids, listviews, treeviews, charts, tab panels, menus, toolbars, and many more components are covered in a multitude of examples.The book also looks at best practices on data storage, application architecture, code organization, presenting recipes for improving themóour cookbook provides expert information for people working with Ext JS.
Table of Contents (15 chapters)
Ext JS 3.0 Cookbook
About the Author
About the Reviewer

Handling tab activation

This recipe explains how you can execute code when a TabPanel's tab is activated. In this recipe's sample tab panel, activating the second tab initiates a request, which will populate the tab with server-side data. You can see this in the following screenshot:

How to do it...

  1. 1. Define the TabPanel and add a listener for the activate event:

    Ext.onReady(function() {
    var tabs = new Ext.TabPanel({
    renderTo: document.body,
    activeTab: 0,
    width: 500,
    height: 250,
    plain: true,
    defaults: { autoScroll: true },
    items: [{
    title: 'First Tab',
    HTML: ""
    title: 'Load on tab activation',
    bodyStyle: 'padding:5px;',
    listeners: { activate: activationHandler }
  2. 2. Create the handler function for the activate event:

    function activationHandler(tab) {
    tab.load({ url: 'tabs-ajax-load.php', params: 'xaction=load' });

How it works...

The activate event indicates that a panel has been visually activated. The handler for this event is passed a reference to the activated panel.