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
Credits
About the Author
About the Reviewer
Preface

Rounding up your validation strategy with server-side validation of form fields


Server-side validation should be an important component of your validation strategy for any application. This recipe explains how to send validation codes and messages to a login form from the server-side code.

The login form built in this recipe performs client-side validation. Upon submission, the server returns an error code and a message, as shown in the next screenshot:

How to do it...

  1. 1. Initialize the QuickTips singleton so that we can have error messages as tool tips:

    Ext.QuickTips.init();
    
  2. 2. Define the login form:

    var loginForm = { xtype: 'form',
    id: 'login-form',
    bodyStyle: 'padding:15px;background:transparent',
    border: false,
    url:'login.php',
    items: [
    { xtype: 'box', autoEl: { tag: 'div',
    html: '<div class="app-msg"> <img src="img/magic-wand.png" class="app-img" /> Log in to The Magic Forum</div>'
    }
    },
    { xtype: 'textfield', id: 'login-user',
    fieldLabel: 'Username',allowBlank: false...