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.

ExtWebComponents 7.0.0


Adding Sencha ExtWebComponents to a React application created using Create React App

This document defines the steps needed to add Sencha ExtWebComponents to a React application generated with Create React App. Create React App is described in the Create React App Overview

If you don’t want to follow the below mentioned steps, then you can consume the boilerplate code with a sample ExtWebComponents React application at ext-web-components-boilerplate-create-react-app.

Create a Create React App starter application

To create a Create React App application, continue in the terminal or command window and 'cd' to the folder where you want to create your new application. Then, use the following command to create your new Create React App application.

npx create-react-app ext-web-components-boilerplate-create-react-app

The create-react-app starts up and will generate a base React application

Once the 'npx create-react-app' command is finished, move to the newly created folder and run the application:

cd  ext-web-components-boilerplate-create-react-app
npm start

A browser window should appear at http://localhost:3000/ (or go to http://localhost:3000/ in your browser). You should see a page with a React logo and a message: 'Edit src/App.js and save to reload.' in the browser.

more details at: https://facebook.github.io/create-react-app/docs/getting-started

Now, stop the 'npm start' app from running in the terminal/command window (ctrl-c). This prepares you for the next steps.

Perform Eject.

One way to expose the webpack configuration is to perform an eject in the project. npm run eject is described here

Alternatives to ejecting (such as forking the 'react-scripts' git repo) are discussed here

To run eject, type the following command in the terminal window:

npm run eject
  • For the question: 'Are you sure you want to eject? This action is permanent.', type 'y' and press 'enter'

This command copies all the config files and dependencies into your project and now you can make appropriate changes to consume the ext-webpack-plugin.

Add Sencha ExtWebComponents to your Create React App starter application

To Add ExtWebComponents to your newly created Create React App starter application, bring up the created application in your favorite editor or IDE - for example, to use Visual Studio Code, cancel the currently running sample application in the terminal or command window and type 'code .' in the terminal or command window.

code .

For the next steps, make sure you are logged into the Sencha npm repository - for instructions, see this link: https://docs.sencha.com/extjs/7.0.0/guides/open_tooling_npm/npm_repo_access.html

Do 1 of the next 2 steps:

either... Add the following to the dependencies section of package.json:

"@sencha/ext": "^7.0.0",
"@sencha/ext-modern": "^7.0.0",
"@sencha/ext-modern-theme-material": "^7.0.0",
"@sencha/ext-web-components": "^7.0.0",
"@sencha/ext-webpack-plugin": "^7.0.0",
"@webcomponents/webcomponentsjs": "^2.2.10",
"copy-webpack-plugin": "^5.0.4",

To install the npm dependencies, in the terminal or command window run the following:

npm install

or... Run the following commands in the terminal/command window:

npm install --save @sencha/ext-web-components @sencha/ext @sencha/ext-modern @sencha/ext-modern-theme-material
npm install --save @sencha/ext-webpack-plugin
npm install --save @webcomponents/webcomponentsjs
npm install --save copy-webpack-plugin

Edit config/webpack.config.js, public/index.html, src/App.js and src/index.js

To configure the ext-webpack-plugin inside application, we update config/webpack.config.js in three steps:

  1. open config/webpack.config.js in your editor
  2. At the top of the file, after the 'use strict' statement, add the following to look like this: ```sh 'use strict';

const ExtWebpackPlugin = require('@sencha/ext-webpack-plugin'); const CopyWebpackPlugin = require('copy-webpack-plugin');

3. do a search for this string:

new HtmlWebpackPlugin

4. below the definition for the HtmlWebpack plugin (should be around or on line 506, the line that contains '),' ), add the following:

new ExtWebpackPlugin({
    framework: 'web-components',
    toolkit: 'modern',
    theme: 'theme-material',
    emit: 'yes',
    script: '',
    packages: [],
    profile: '',
    browser: 'no',
    verbose: 'no',
    inject: 'no'
new CopyWebpackPlugin([{
    from: './node_modules/@webcomponents/webcomponentsjs/webcomponents-bundle.js',
    to: './webcomponents-bundle.js'
  1. do a search for this string (around or on line 154):

path: isEnvProduction ? paths.appBuild : undefined,

  1. Update this line with the following line:
    path: isEnvProduction ? paths.appBuild : paths.appPublic,
  2. save config/webpack.config.js in your editor

  3. open public/index.html in your editor

Now after configuration, you are ready to use Ext-Web-Components inside the application.

  1. Add Ext.js and Ext.css inside the inside public/index.html and also webcomponents-bundle.js for the compatibility of Web Components with all major browsers. the file should look like this (the example below has removed the comments from the original public/index.html file):
<!DOCTYPE html>
<html lang="en">
    <meta charset="utf-8" />
    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <meta name="theme-color" content="#000000" />
    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />

    <script src="webcomponents-bundle.js"></script>
    <link rel="stylesheet" href="%PUBLIC_URL%/ext/ext.css">

    <title>React App</title>
    <noscript>You need to enable JavaScript to run this app.</noscript>

    <script src="%PUBLIC_URL%/ext/ext.js"></script>

    <div id="root"></div>
  1. save public/index.html in your editor

  2. open src/App.js in your editor

  3. in src/App.js replace the code with:

import '@sencha/ext-web-components/lib/ext-panel.component';
import React from 'react';
import './App.css';

function App() {
  return (
      title="EWC Panel in React"
      <h1>I am the ExtWebComponents Panel</h1>

export default App;
  1. save src/App.js in your editor

Run the application

In the terminal or command window, run the application:

npm start

Browse to http://localhost:3000 in your browser. You should see the React starter application with an ExtWebComponents Panel in the browser.

React with ExtWebComponents

ExtWebComponents 7.0.0