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 includes a theming API that allows you to configure the look and feel of components. This guide explains the basics of the ExtReact theming API and walks you through the process of creating a custom theme.

Custom themes for ExtReact can also be created without writing code using Sencha Themer.

Using a Built-in Theme

ExtReact contains several built in themes:

Theme Description
theme-material The default theme - based on Google's material design guidelines
theme-ios Based on the look and feel of iOS
theme-triton A simple, flat theme
theme-neptune A theme with gradients

Set the theme for your application using the ExtReact webpack plugin:

// example webpack.config.js

const ExtReactWebpackPlugin = require('@extjs/reactor-webpack-plugin');

module.exports = {
  plugins: [
    new ExtReactWebpackPlugin({
      theme: 'theme-material' // this is the default

Creating a Custom Theme

Built-in themes can be extended to create a custom theme. With the @extjs/reactor package installed, you can create a custom theme by running the following command:

npm install -g @extjs/reactor # adds ext-react cli to your path

ext-react generate theme --name <theme-name> --baseTheme <theme-material|theme-ios|theme-triton (optional, defaults to theme-material)>

This will create a new custom theme in ext-react/packages/<theme-name>.

For example, to create a new theme called "my-theme" which extends the material theme, you would run:

ext-react generate theme --name my-theme

Apply the theme to your app by updating your ExtReactWebpackPlugin settings:

new ExtReactWebpackPlugin({
  theme: './ext-react/packages/<theme-name>' // this is the default

*Note: theme-triton and theme-ios are separate npm packages that are not included with ExtReact by default. You can install them by running:

npm install --save @extjs/ext-react-theme-triton @extjs/ext-react-theme-ios

Customizing Your Theme

Syntax and Directory Structure

An ExtReact theme is made up of files that use the Fashion syntax, Sencha's own dialect of SASS. Files use the .scss extension and are organized in the following directory structure:



The etc directory contains additional utility functions or mixins. The all.scss file is automatically included in the build if present. Additional files can be included via an @import directive or added to the theme's package.json under sencha/sass/etc.


The src directory contains rules and UI mixin calls that can use the variables defined in sass/var/. File paths correspond to ExtReact namespaces and are only included in the build if the corresponding class is used in your application. The namespace for each component can be found in the API documentation. For example, to define a ui for a List, which has a fully qualified name of Ext.dataview.List, create:


In addition to including files based on fully-qualified name, you can also add individual files to the theme's package.json, under sencha.sass.src, or use the @import directive.


The var directory contains global variables. As with src, file paths correspond to the component namespaces. In addition to including files based on fully-qualified name, you can add individual files to the theme's package.json, under sencha.sass.var, or use the @import directive.

Setting Global Variables

The best way to start customizing a theme is to set the values of global variables. Each component has it's own set of global variables that affect the look and feel of all instances of that component. For example, we can change the font-family for Panel headers by creating:


...and adding the following content...

// Panel.scss
$panel-header-font-family: 'Comic Sans';

In addition to the variables provided for each component, there are a number of variables that affect all components. These are listed in Global_CSS in the API documentation.

For example, to set a new $base-color for the theme, create:


...and add the following content...

// Component.scss
$base-color: #025B80;

Some developers may prefer to put all of their global variables in a single file. This can be done by simply putting them all in var/Ext/Component.scss or by creating a file of your choice and adding it to sencha.sass.var in the theme's package.json.

Adding UIs

Each component can be configured with a ui prop that accepts the names of one or more uis used to style the component. UIs are essentially a set of css classes created using mixins provided by the theming API. UIs are defined in the theme's sass/src directory. For example, if we wanted to create a button that looked like this:

pink button

We could do so by creating:


...and adding the following content...

// Button.scss
@include button-ui(
  $ui: 'pink',
  $background-color: #E91E63,
  $color: white

We would then apply the "pink" ui to Buttons as follows:

<Button ui="pink" text="Click Me"/>

Components can be configured with multiple UIs. For example, we can add the built-in round and raised uis to make our button round and raised:

<Button ui="pink round raised" text="Click Me"/>

pink button

Big Mode

Many variables and ui mixin parameters have a corresponding variable or parameter with the suffix -big. The -big variables take effect when the x-big css class is applied to the html body element. This automatically occurs when your application is viewed on a mobile device (tablet or phone). The variables without the -big suffix take effect when the application is viewed on the desktop.

Further Reading

Theming in the Modern Toolkit

ExtReact 6.5.1