ExtReact Docs Help


The documentation for the ExtReact product diverges somewhat from the documentation of other Sencha products. The sections below describe documentation for all products except where indicated as unique to ExtReact.

Terms, Icons, and Labels

Many classes have shortcut names used when creating (instantiating) a class with a configuration object. The shortcut name is referred to as an alias (or xtype if the class extends Ext.Component). The alias/xtype is listed next to the class name of applicable classes for quick reference.

ExtReact component classes list the configurable name prominently at the top of the API class doc followed by the fully-qualified class name.

Access Levels

Framework classes or their members may be specified as private or protected. Else, the class / member is public. Public, protected, and private are access descriptors used to convey how and when the class or class member should be used.

Member Types

Member Syntax

Below is an example class member that we can disect to show the syntax of a class member (the lookupComponent method as viewed from the Ext.button.Button class in this case).

lookupComponent ( item ) : Ext.Component

Called when a raw config object is added to this container either during initialization of the items config, or when new items are added), or {@link #insert inserted.

This method converts the passed object into an instanced child component.

This may be overridden in subclasses when special processing needs to be applied to child creation.


item :  Object

The config object being added.


The component to be added.

Let's look at each part of the member row:

Member Flags

The API documentation uses a number of flags to further commnicate the class member's function and intent. The label may be represented by a text label, an abbreviation, or an icon.

Class Icons

- Indicates a framework class

- A singleton framework class. *See the singleton flag for more information

- A component-type framework class (any class within the Ext JS framework that extends Ext.Component)

- Indicates that the class, member, or guide is new in the currently viewed version

Member Icons

- Indicates a class member of type config

Or in the case of an ExtReact component class this indicates a member of type prop

- Indicates a class member of type property

- Indicates a class member of type method

- Indicates a class member of type event

- Indicates a class member of type theme variable

- Indicates a class member of type theme mixin

- Indicates that the class, member, or guide is new in the currently viewed version

Class Member Quick-Nav Menu

Just below the class name on an API doc page is a row of buttons corresponding to the types of members owned by the current class. Each button shows a count of members by type (this count is updated as filters are applied). Clicking the button will navigate you to that member section. Hovering over the member-type button will reveal a popup menu of all members of that type for quick navigation.

Getter and Setter Methods

Getting and setter methods that correlate to a class config option will show up in the methods section as well as in the configs section of both the API doc and the member-type menus just beneath the config they work with. The getter and setter method documentation will be found in the config row for easy reference.

ExtReact component classes do not hoist the getter / setter methods into the prop. All methods will be described in the Methods section

History Bar

Your page history is kept in localstorage and displayed (using the available real estate) just below the top title bar. By default, the only search results shown are the pages matching the product / version you're currently viewing. You can expand what is displayed by clicking on the button on the right-hand side of the history bar and choosing the "All" radio option. This will show all recent pages in the history bar for all products / versions.

Within the history config menu you will also see a listing of your recent page visits. The results are filtered by the "Current Product / Version" and "All" radio options. Clicking on the button will clear the history bar as well as the history kept in local storage.

If "All" is selected in the history config menu the checkbox option for "Show product details in the history bar" will be enabled. When checked, the product/version for each historic page will show alongside the page name in the history bar. Hovering the cursor over the page names in the history bar will also show the product/version as a tooltip.

Search and Filters

Both API docs and guides can be searched for using the search field at the top of the page.

On API doc pages there is also a filter input field that filters the member rows using the filter string. In addition to filtering by string you can filter the class members by access level, inheritance, and read only. This is done using the checkboxes at the top of the page.

The checkbox at the bottom of the API class navigation tree filters the class list to include or exclude private classes.

Clicking on an empty search field will show your last 10 searches for quick navigation.

API Doc Class Metadata

Each API doc page (with the exception of Javascript primitives pages) has a menu view of metadata relating to that class. This metadata view will have one or more of the following:

Expanding and Collapsing Examples and Class Members

Runnable examples (Fiddles) are expanded on a page by default. You can collapse and expand example code blocks individually using the arrow on the top-left of the code block. You can also toggle the collapse state of all examples using the toggle button on the top-right of the page. The toggle-all state will be remembered between page loads.

Class members are collapsed on a page by default. You can expand and collapse members using the arrow icon on the left of the member row or globally using the expand / collapse all toggle button top-right.

Desktop -vs- Mobile View

Viewing the docs on narrower screens or browsers will result in a view optimized for a smaller form factor. The primary differences between the desktop and "mobile" view are:

Viewing the Class Source

The class source can be viewed by clicking on the class name at the top of an API doc page. The source for class members can be viewed by clicking on the "view source" link on the right-hand side of the member row.

ExtReact 6.5.1


ExtReact for Ext JS Developers

ExtReact is built on top of the Ext JS modern toolkit. This guide aims to help developers with Ext JS experience convert their knowledge to ExtReact.

Importing Components

The @extjs/reactor package makes all Ext JS classes with xtypes available as React components. Component names are derived from the capitalized, camel-cased form of the xtype. For example, Ext.grid.Grid has an xtype of grid, and can be imported thusly:

import { Grid } from '@extjs/ext-react';

Dashes in xtypes are be converted to underscores. For example:

import { D3_HeatMap } from '@extjs/ext-react-d3';

Configuring Components

React props are converted to Ext JS configs. Here's a typical use of Ext.grid.Grid:

import React, { Component } from 'react';
import { Grid, Column } from '@extjs/ext-react';

export default class UsersGrid extends Component {

    store = Ext.create('Ext.data.Store', {
        fields: ['name', 'email'],
        data: [
            { name: 'Tim Smith', email: '[email protected]' },
            { name: 'Jill Lindsey', email: '[email protected]' }

    render() {        
        return (
            <Grid title="Users" store={this.store}>
                <Column text="Name" dataIndex="name"/>
                <Column text="Email" dataIndex="email"/>


In the example above, we set the Grid's title and store configs using props. We set the columns config using Column child elements instead of using the columns prop. Both forms are acceptible, but we think that using child elements is more intuitive for React developers, so this is the form you'll see in all of our examples. ExtReact automatically knows to map certain child elements like Column to configs on the parent component. Another example of this is Menu:

<Button text="Options">
        <MenuItem text="Options 1"/>
        <MenuItem text="Options 2"/>
        <MenuItem text="Options 3"/>

Which can also be written as:

        { text: 'Option 1' },
        { text: 'Option 2' },
        { text: 'Option 3' }

Handling Events

Any prop starting with "on" followed by a capital letter is automatically converted to an Ext JS event listener. Since Ext JS events are all lower-case, case is not preserved. You're free to use camel-case, which is common in React.

import React, { Component } from 'react';
import { SliderField } from '@extjs/ext-react';

export default function MyComponent() {
    return (
            onChange={(slider, value) => console.log(`Value set to ${value}`)}

Event handler props can also take an object with additional options:

        single: true, // handler will only be called once
        fn: () => {...}

You can also use a listeners object as is common in traditional Ext JS:

import React, { Component } from 'react';
import { SliderField } from '@extjs/ext-react';

export default function MyComponent() {
    return (
                change: (slider, value) => console.log(`Value set to ${value}`)

Special Props


Any prop that takes a subclass of Ext.Widget can be replaced with a child element. To use a child element to replace a prop, set the child's rel prop to the name of the prop being replaced. For example, the menu prop on Button can be replaced with a child <Menu> element:

<Button text="Theme">
    <Menu rel="menu">
        <MenuItem text="Triton"/>
        <MenuItem text="iOS"/>
        <MenuItem text="Material"/>


Use the defaults prop to apply a set of props to all children. For example, to use flex: 1 for all items in a container:

<Container layout="vbox" defaults={{ flex: 1 }}>

The ref Prop

Refs point to Ext JS component instances:

import React, { Component } from 'react';
import { SliderField } from '@extjs/ext-react';

export default class MyComponent {
    render() {
        return (
                ref={ slider => this.slider = slider }
                onChange={() => this.onChange()}

    onChange() {
        console.log('Slider value', this.slider.getValue()); // this.slider is an Ext.field.Slider

Using HTML Elements and Non-ExtReact Components Inside of ExtReact Components

HTML elements are wrapped in an Ext.Component instance when they appear within an ExtReact Component. This is allows ExtReact layouts to correctly position non-ExtReact components. For example...

<Panel layout="hbox">

... will result in two divs side-by-side. The component structure created is equivalent to:

    xtype: 'panel',
    layout: 'hbox'
    items: [{
        xtype: 'component',
        html: '<div>left</div>'
    }, {
        xtype: 'component',
        html: '<div>right</div>'

Extending Ext JS Components

You can extend Ext JS component using Ext.define, just as you would in traditional Ext JS code. Use the reactify function from @extjs/reactor to convert a custom Ext JS component to a React component. For example:

import { reactify } from '@extjs/reactor';

const MyGrid = Ext.define('MyPackage.view.MyGrid', {
    extend: 'Ext.grid.Grid',

export default reactify(MyGrid);

ExtReact 6.5.1