Book Image

Ext JS 4 Plugin and Extension Development

By : Abdullah Al Mohammad
Book Image

Ext JS 4 Plugin and Extension Development

By: Abdullah Al Mohammad

Overview of this book

Ext JS is a pure JavaScript application framework for building interactive web applications using techniques such as Ajax, DHTML, and DOM scripting. Ext JS 4 Plugin and Extension Development is a practical, step-by-step tutorial which guides you to learn and develop ExtJS plugins and extensions. There are a lot of examples with explanations and plenty of code provided to make it easier and quicker to pick up. Starting with the fundamentals, this book introduces some of the ExtJS library and community provided plugins and extensions and finishes with several hands-on, real world development examples. You will get a clear concept of ExtJS plugins and extensions and learn how to use them. You will also learn how to develop an ExtJS plugin and extension by going through several examples with code and screenshots. Ext JS 4 Plugin and Extension Development book will provide you with the knowledge to develop ExtJS plugins and extensions using real-life examples.
Table of Contents (16 chapters)
Ext JS 4 Plugin and Extension Development
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

The Callout extension


Callout is an extension class, which is a CSS styleable floating callout container with an optional arrow, developed by John Yanarella. It is useful for creating hint overlays and interactive callout windows/popovers.

We can see a callout popover in the following screenshot:

An Ext.ux.callout.Callout extension can be easily configured to:

  • Show its associated callout arrow at various locations, including top, bottom, left, right, top-left, top-right, bottom-left, bottom-right, left-top, left-bottom, right-top, right-bottom

  • Position itself relative to a target Ext.Element or Ext.Component, and it will maintain that relative position when that target moves or the browser resizes

  • Automatically hides itself in response to mouse clicks outside the callout bounds

  • Automatically dismisses itself after a configurable delay

  • Fade in when shown, and fade out when hidden

A live demo is available for this extension at http://lab.codecatalyst.com/Ext.ux.callout.Callout. This extension is...