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Ext JS 4 Plugin and Extension Development
Ext JS 4 Plugin and Extension Development

Ext JS 4 Plugin and Extension Development: This book makes it fast and fun for ExtJS developers to get to grips with developing plugins and extensions. The step-by-step instructions, with plentiful examples and code, will give you the skills in no time.

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Ext JS 4 Plugin and Extension Development

Chapter 2. Ext JS-provided Plugins and Extensions

This chapter introduces some of the very useful and popular plugins and extensions available in the Ext JS library.

In this chapter we will cover:

  • MultiSelect

  • ItemSelector

  • TreeViewDragDrop

  • CheckColumn

  • CellEditing

  • RowEditing

  • LiveSearchGridPanel

The MultiSelect extension


Ext.ux.form.MultiSelect is a form field type which allows the selection of one or more items from a list. A list is populated using a data store. Items can be reordered via the drag-and-drop method, if the ddReorder property of this class is set to true.

Here, in the following code, a form panel class has been defined, in which the MultiSelect extension has been used as an item of this form:

Ext.define('Examples.view.multiselect.MultiSelectFormPanel', {
  extend : 'Ext.form.Panel',
  alias : 'widget.multiselectformpanel',
  requires : ['Ext.ux.form.MultiSelect'],

  constructor : function(config) {

    Ext.apply(this, {
      bodyPadding : 10,
      items : [{
        anchor : '100%',
        xtype : 'multiselect',
        fieldLabel : 'Multi Select',
        name : 'multiselect',
        store : Ext.create('Examples.store.DummyStore'),
        valueField : 'name',
        displayField : 'name',
        ddReorder : true,
        listeners : {
          change :...

The ItemSelector extension


ItemSelector is a specialized MultiSelect field that renders as a pair with the MultiSelect field; one with the available options and the other with the selected options. A set of buttons in between, allows the items to be moved between the fields and reordered within the selection. Also, they can be moved via drag-and–drop method.

Here, in the following code, a form panel class is defined, in which we are using the ItemSelector extension as an item of this form:

Ext.define('Examples.view.itemselector.ItemSelectorFormPanel', {
  extend : 'Ext.form.Panel',
  alias : 'widget.itemselectorformpanel',
  requires : ['Ext.ux.form.ItemSelector'],

  constructor : function(config) {

    Ext.apply(this, {
      bodyPadding : 10,
      items : [{
        anchor : '100%',
        xtype: 'itemselector',
        name: 'itemselector',
        store : Ext.create('Examples.store.DummyStore'),
        valueField : 'name',
        displayField : 'name',
        fromTitle: 'Available...

The TreeViewDragDrop plugin


This plugin provides a drag and/or drop functionality for a TreeView class. It creates a specialized instance of DragZone, which knows how to drag out of a TreeView class, and loads the data object which is passed on to the cooperating methods of DragZone with the following properties:

  • copy: Boolean

    It is the value of the copy property of TreeView or true if the TreeView class was configured with allowCopy set to true and the Ctrl key was pressed when the drag operation was begun.

  • view: TreeView

    It is the source TreeView from which the drag originated.

  • ddel: HtmlElement

    It is the drag proxy element which moves with the mouse.

  • item: HtmlElement

    It is the TreeView node upon which the mousedown event was registered.

  • records: Array

    It is an array of models representing the selected data being dragged from the source TreeView.

It also creates a specialized instance of Ext.dd.DropZone, which cooperates with other DropZone classes. These DropZone classes are members of...

The CheckColumn extension


Ext.ux.CheckColumn is an extension of Ext.grid.column.Column that renders a checkbox in each column cell. This checkbox toggles the truthiness of the associated data field on a click. In addition to toggling a Boolean value within the record data, this class adds or removes a CSS class x-grid-checked, on the <td> element based on whether or not it is checked to alter the background image used for a column.

Here in the following code we are defining a grid class in which we are using the CheckColumn extension to provide a checkbox within each cell of a column:

Ext.define('Examples.view.checkcolumn.CheckColumnGrid', {
  extend : 'Ext.grid.Panel',
  alias : 'widget.checkcolumngrid',
  requires : ['Examples.store.DummyStore',
              'Ext.ux.CheckColumn'],

  constructor : function(config) {

    Ext.apply(this, {
      border : false,
      store : Ext.create('Examples.store.DummyStore'),
      columns : [{
        header : 'Name',
        dataIndex : 'name...

The CellEditing plugin


The Ext.grid.plugin.CellEditing plugin injects editing at the cell level for a Grid. The editor field can be a field instance or a field configuration which needs to be provided within the editor configuration option within the columns definition. With the CellEditing plugin we can edit a cell at any time. If an editor is not specified for a particular column, that cell cannot be edited and it will be skipped when activated via the mouse or the keyboard.

When we configure a column to use an editor for cell editing, we should choose an appropriate field type to match the data type that this editor field will be editing. For example, to edit a date value in the cell, it would be useful to specify Ext.form.field.Date as the editor.

Here, in the following code we are defining a grid class in which we are using the CellEditing plugin to edit the cells:

Ext.define('Examples.view.cellediting.CellEditingGrid', {
  extend : 'Ext.grid.Panel',
  alias : 'widget.celleditingGrid'...

The RowEditing plugin


The Ext.grid.plugin.RowEditing plugin injects editing at the row level for a Grid. When editing begins, a small floating dialog will be shown for the appropriate row. Each editable column will show a field for editing. There is a button to save or cancel all changes for the edit. The editor field can be a field instance or a field configuration and we need to provide this within the editor configuration option within the column definition. If an editor is not specified for a particular column, the cell of that column will not be editable and the value of the cell will be displayed.

When we configure a column to use an editor for row editing, we should choose an appropriate field type to match the data type that this editor field will be editing. For example, to edit a date value in the cell, it would be useful to specify Ext.form.field.Date as the editor.

Here, in the following code we are defining a grid class in which we are using the RowEditing plugin to edit the row...

The LiveSearchGridPanel extension


Ext.ux.LiveSearchGridPanel is a GridPanel class that supports live search.

Here, in the following code, a grid panel class is defined by extending the LiveSearchGridPanel extension:

Ext.define('Examples.view.livesearch.LiveSearchGrid', {
  extend : 'Ext.ux.LiveSearchGridPanel',
  alias : 'widget.livesearchgrid',
  requires : ['Examples.store.DummyStore'],

  constructor : function(config) {

    Ext.apply(this, { 
      border : false,
      store : Ext.create('Examples.store.DummyStore'),
      columns : [{
        header : 'Name',
        dataIndex : 'name',
        flex : 1
      },{
        header : 'Birth date',
        dataIndex : 'birthdate',
        renderer : Ext.util.Format.dateRenderer('m/d/Y'),
        flex : 1
      }]
    });

    this.callParent(arguments);

  }
});

In the following screenshot you can see the result of the LiveSearchGrid class that we have defined, which is used within a window:

You can see that a grid panel with a Search input...

Summary


Ext JS is really a rich library that provides several ready-to-use, useful extensions and plugins. In this chapter we went through some of those popular extensions and plugins, and learned how to use them.

In the next chapter we will go through hands-on development of an extension called Labeled Spinner by extending the Ext.form.field.Spinner class.

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Key benefits

  • Easy-to-follow examples on ExtJS plugins and extensions
  • Step-by-step instructions on developing ExtJS plugins and extensions
  • Provides a walkthrough of several useful ExtJS libraries and communities

Description

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.

Who is this book for?

Ext JS 4 Plugin and Extension Development is ideal for experienced ExtJS developers who want to expand their knowledge in developing plugins and extensions. This book is also for those developers who are new to ExtJS development, with at least some knowledge on ExtJS basics.

What you will learn

  • Explore ExtJS plugins and extensions and the differences between them
  • Usage of ExtJS plugins and extensions
  • Follow along with code and screenshots to learn how to develop ExtJS plugins and extensions
  • Discover the ExtJS library and community provided extensions
  • Experience a step-by-step, hands-on development of several real-world ExtJS plugins and extensions
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Length: 116 pages
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Language : English
ISBN-13 : 9781782163725
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Table of Contents

9 Chapters
Plugins and Extensions Chevron down icon Chevron up icon
Ext JS-provided Plugins and Extensions Chevron down icon Chevron up icon
Ext JS Community Extensions and Plugins Chevron down icon Chevron up icon
Labeled Spinner Chevron down icon Chevron up icon
Chart Downloader Chevron down icon Chevron up icon
Grid Search Chevron down icon Chevron up icon
Input Field with Clear Button Chevron down icon Chevron up icon
Message Bar Chevron down icon Chevron up icon
Intuitive Multiselect Combobox Chevron down icon Chevron up icon

Customer reviews

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(1 Ratings)
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William Parker Oct 31, 2013
Full star icon Full star icon Full star icon Full star icon Full star icon 5
There have been several decent books covering Ext JS 4 published in the last year, some better than others, but unfortunately most follow the same pattern, this book is different."Ext JS 4 Plugin and Extension Development" makes a couple of assumptions about the reader's knowledge level and then jumps into the interesting stuff. I really like the way that the author lays the groundwork, explaining the pros and cons of Plugins and Extensions, and uses well known examples leading up to discussing how to go about developing your own.Why this works is that none of the examples are very complex, but they all have a real value, one or two are worth the price of the book given the value they will add to any 'modern' interface - the Intuitive Multiselect Combobox and Grid Search will both be in my next project.Most Ext JS books cover the subject in a similar manner and all fail in the same area, that being the server side code, so they ultimately force you to go and find another book for the server side, which probably has no reference to Ext JS - this book doesn't leave the reader looking for additional information, it covers everything they need to know - and its short...
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