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  • Book Overview & Buying Ext JS 3.0 Cookbook
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Ext JS 3.0 Cookbook

Ext JS 3.0 Cookbook

4.7 (6)
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Ext JS 3.0 Cookbook

Ext JS 3.0 Cookbook

4.7 (6)
Buy this Book

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)
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Ext JS 3.0 Cookbook
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Ext JS 3.0 Cookbook
Credits
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Credits
About the Author
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About the Author
About the Reviewer
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About the Reviewer
Preface
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Preface
Lock Free Chapter
1
DOM and Data Types, the Ext JS Way
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DOM and Data Types, the Ext JS Way
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Introduction
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Detecting browsers and platforms used by clients
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Retrieving DOM nodes and elements
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Acquiring references to Ext JS components
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Running high-performance DOM queries
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Encoding and decoding JSON
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Encoding and decoding URL data
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Determining the object type and converting empty references to a default value
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Finding objects in an array and removing array items
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Manipulating strings à la Ext JS
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Effortless range checking for numbers
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Formatting, parsing, and manipulating dates
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Preventing naming conflicts and scoping non-global variables
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Extending JavaScript objects, the Ext JS way
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Adding features to the Ext JS classes
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Building custom JavaScript classes that inherit the functionality of Ext JS
2
Laying Out a Rich User Interface
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Laying Out a Rich User Interface
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Introduction
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Laying out items within a container using CSS-style absolute positioning
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Maintaining components' proportions when their containers are resized
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Stacking items with an accordion layout
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Wizard style UI using a card layout
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Using a tabbed look
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Taking all the browser window's real estate
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Positioning components in multiple columns
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Using the table layout
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Creating a modern application layout with collapsible regions
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A custom column layout
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A three-panel application layout with a single line of code
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Creating a portal and a portlets catalog
3
Load, Validate, and Submit Forms
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Load, Validate, and Submit Forms
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Introduction
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Specifying the required fields in a form
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Setting the minimum and maximum length allowed for a field's value
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Changing the location where validation errors are displayed
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Deferring field validation until form submission
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Creating validation functions for URLs, email addresses, and other types of data
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Confirming passwords and validating dates using relational field validation
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Rounding up your validation strategy with server-side validation of form fields
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Loading form data from the server
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Serving the XML data to a form
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Using forms for file uploads
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Building friendlier forms using text hints
4
Fun with Combo Boxes and Date Fields
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Fun with Combo Boxes and Date Fields
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Introduction
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Using the combo box with local data
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Displaying remote data with a combo box
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Combo box with autocomplete
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How the combo box helps you type
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Converting an HTML drop-down list into an Ext combo box
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Cascading combo boxes
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Using templates to change the look of combo box items
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Using paging to handle a large number of combo box items
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The different ways to set up disabled dates in a date field
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The date range selector
5
Using Grid Panels to Display and Edit Tabular Data
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Using Grid Panels to Display and Edit Tabular Data
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Introduction
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Displaying XML data sent by the server
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Displaying JSON data generated by the server
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Creating a grid that uses server-side sorting
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Implementing data paging
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Data grouping with live group summaries
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Creating data previews
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Creating a grid panel with expandable rows
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Using checkboxes to select grid rows
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Numbering rows in a grid panel
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Changing grid panel data using cell editors
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Automatic uploading of data edited with a grid
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Performing batch uploads of data edited with a grid
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Changing a grid's data store and columns at runtime
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More Applications of Grid and List Views
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More Applications of Grid and List Views
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Introduction
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Creating a master-details view with a grid and a panel
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Creating a master-details view with a grid and a form
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Creating a master-details view with a combo box and a grid
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Creating a master-details view with two grids
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Displaying large recordsets with a buffered grid
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Using the lightweight ListView class
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Editing rows with the RowEditor plugin
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Adding tool tips to grid cells
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Using the PropertyGrid class
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Using drag-and-drop between two grids
7
Keeping Tabs on Your Trees
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Keeping Tabs on Your Trees
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Introduction
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Handling tab activation
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Loading tab data with Ajax
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Adding tabs dynamically
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Enhancing a TabPanel with plugins: The Close menu
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Enhancing a TabPanel with plugins: The TabScroller menu
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Populating tree nodes with server-side data
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Tree and panel in a master-details relationship
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The multi-column TreePanel
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Drag-and-drop between tree panels
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Drag-and-drop from a tree to a panel
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Making Progress with Menus and Toolbars
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Making Progress with Menus and Toolbars
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Introduction
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Placing buttons in a toolbar
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Working with the new ButtonGroup component
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Placing menus in a toolbar
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Commonly used menu items
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Embedding a progress bar in a status bar
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Creating a custom look for the status bar items
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Using a progress bar to indicate that your application is busy
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Using a progress bar to report progress updates
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Changing the look of a progress bar
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Well-charted Territory
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Well-charted Territory
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Introduction
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Setting up a line chart to display local data
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Setting up a line chart to display data retrieved from the server
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Setting up a column chart to display local data
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Setting up a column chart to display data retrieved from the server
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Displaying local data with a pie chart
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Displaying remote data with a pie chart
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Using a chart component to display multiple data series
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Creating an auto-refreshing chart
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Configuring the Slider component to display a custom tip
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Enhancing the Slider component with custom tick marks
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Patterns in Ext JS
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Patterns in Ext JS
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Introduction
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Sharing functionality with the Action class
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Autosaving form values
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Saving resources with lazy component instantiation
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Extending a class
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Using code modules to achieve encapsulation
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Implementing a publish/subscribe mechanism with relayEvents()
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Augmenting a class with a plugin
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Building preconfigured classes
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Implementing state preservation with cookies

Determining the object type and converting empty references to a default value

This recipe teaches you how to determine the types of different objects using the facilities of Ext JS, as well as a simple method that can be used to initialize empty references with a default value.

How to do it...

You can determine the types of different objects in the following way:

  1. 1. Create some dummy data structures:

    var colorsArray = new Array();
colorsArray[0] = 'Blue';
colorsArray[1] = 'Red';
colorsArray[2] = 'White';
var colorsObject = { color1: 'Blue', color2: 'Red', color3: 'White' };
var aNumber = 1;
var aString = '1';
var sample;
var empty;

  2. 2. Check the types of our variables:

    var colorsArrayType = Ext.type(colorsArray);
// colorsArrayType's value is "array".
var isArray = Ext.isArray(colorsArray);
// isArray is true
var colorsObjectType = Ext.type(colorsObject);
// colorsObjectType's value is "object".
var isArray = Ext.isArray(colorsObject);
// isArray is false
var number = Ext.num(aNumber, 0);
// number is 1.
number = Ext.num(aString, 0);
// Since aString is not numeric, the supplied
// default value (0) will be returned.
var defined = Ext.util.Format.undef(sample);
// defined is an empty string
sample = "sample is now defined";
defined = Ext.util.Format.undef(sample);
// defined is now "sample is now defined".
var notEmpty = Ext.value(empty, 'defaultValue', false);
// notEmpty is 'defaultValue'

How it works...

The Ext.type(object) function is capable of detecting elements, objects, text nodes, whitespaces, functions, arrays, regular expressions, numbers, and node lists.

As its name indicates, Ext.isArray(object) simply checks whether the passed object is a JavaScript array. Ext.num(value, defaultValue), in turn, does a numeric type check on the passed value and returns the default value when the argument is not numeric.

Ext.util.Format.undef(value) is a very useful function when you need to test for undefined values. It returns either the supplied argument or an empty string if the argument is undefined.

Ext.value(value, defaultValue, allowBlank) also allows you to specify a default value when the value being tested is undefined.

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