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The Ext JS Reactor: Use Your Favorite Ext JS Components Inside React

November 30, 2016 168 Views

One of the biggest announcements I had the privilege of making on the keynote stage at SenchaCon 2016 was the ability to use Ext JS components inside React apps with the new @extjs/reactor package on npm.

How To Use Ext JS Inside React

Just install @extjs/reactor:

npm install --save @extjs/reactor

…add the following code to your app:

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

…and you can start using Ext JS components like the grid in your React components. Here’s an example:

import { Grid } from '@extjs/reactor/modern';

function MyReactComponent(props) {
    return (


An Ext JS Grid in React


) }

To use any Ext JS component in React, simply import that component by xtype from @extjs/reactor/modern or @extjs/reactor/classic. Because React components are always upper case, @extjs/reactor automatically converts xtypes to lower case for your convenience. In other words:

import { Grid } from '@extjs/reactor/modern';

…is equivalent to:

import { grid as Grid } from '@extjs/reactor/modern';

This syntax is made possible by a babel plugin, @extjs/reactor-babel-plugin, which actually converts the above to:

import { reactify } from '@extjs/reactor';
const Grid = reactify('grid');

The reactify function creates a React component wrapper for any Ext JS class or xtype. You can use reactify on your own classes as well. For example, if you have a custom class with xtype: ‘mygrid’, you can use:

import { reactify } from '@extjs/reactor';
const MyGrid = reactify('mygrid');

Or, if you have a reference to the custom class, you pass it to reactify as well:

import { MyExtJSGrid } from './extComponents/MyExtJSGrid';
const MyGrid = reactify(MyExtJSGrid);

Once you’ve imported an Ext JS component, you can use it as you would any other React component. Configs are set using props. Any props starting with “on*” become listeners, so you can do things like:

 console.log(`${record.get('name')} selected.`)}

Child tags are automatically added to the items config, so Ext JS layouts work like you’d expect:

        This panel is on the left.
        This panel is on the right.

The @extjs/reactor package also adheres to React’s principle of minimizing changes to the dom. If you change the value of the title prop in this example:

function MyReactComponent({ title }) {
    return (
            My title may change!

@extjs/reactor automatically calls the corresponding setTitle method on the Ext.Panel instance rather than tearing down and rebuilding the entire component.

Most React projects are built using webpack, so we’ve provided a plugin, @extjs/reactor-webpack-plugin, that produces a minimal build of Ext JS containing only those components that you use in your app. The plugin scans your code for import statements as well calls to Ext.create and Ext.require to determine which classes you use, then sends that information to Sencha Cmd to produce the minimized, optimized build of the framework. Here’s an example config:

plugins: [
    new ExtJSReactorWebpackPlugin({
        sdk: '/path/to/ext',
        theme: 'theme-material',
        toolkit: 'modern',
        packages: ['charts']

Try It Out and Share Your Feedback

Want to try it out but don’t have an existing React app? The extjs-reactor monorepo contains a boilerplate project to help you get up and running. There is also a boilerplate project for the classic toolkit.

Found a bug or want to make a suggestion? File a github issue.


Most React developers cobble together components from multiple vendors and open source libraries. Juggling conflicting dependencies, disparate release schedules, and varying levels of quality and support can be a nightmare. With @extjs/reactor, developers can get all of the components they need from a single, proven, commercially supported library – Ext JS. The @extjs/reactor package gives you everything you need to start using Ext JS in React today!

coming soon

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