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

Form fields

Now we know that each type of field is defined by its xtype. But where do xtypes come from, and how many of them are there? An xtype is just a reference to a particular Ext component, so a 'textfield' xtype is the same as its Ext.form.TextField counterpart. Here are examples of some of the xtypes that are available to us:

  • textfield
  • timefield
  • numberfield
  • datefield
  • combo
  • textarea

Because these are all just Ext components, we could easily be using a grid, toolbar, or button—pretty much anything! A recurring theme in Ext components is that everything is interchangeable, and everything shares the same core functions. This ensures that just about any scenario can be handled with the Ext library.

Our basic field config is set up like this:

{
xtype: 'textfield',
fieldLabel: 'Title',
name: 'title'
}

Of course, we have the xtype that defines what type of a field it is—in our case it is a textfield. The fieldLabel is the text label that is...