React component

CKEditor 5 consists of a ready to use builds and a CKEditor 5 Framework upon which the builds are based.

The easiest way to use CKEditor 5 in your React application is by choosing one of the editor builds. Additionally, it is also possible to integrate into your application CKEditor 5 from source.

# Quick start

Install the component and the build of your choice:

npm install --save @ckeditor/ckeditor5-react @ckeditor/ckeditor5-build-classic

Use the <CKEditor> component inside your project:

import React, { Component } from 'react';
import CKEditor from '@ckeditor/ckeditor5-react';
import ClassicEditor from '@ckeditor/ckeditor5-build-classic';

class App extends Component {
    render() {
        return (
            <div className="App">
                <h2>Using CKEditor 5 build in React</h2>
                <CKEditor
                    editor={ ClassicEditor }
                    data="<p>Hello from CKEditor 5!</p>"
                    onInit={ editor => {
                        // You can store the "editor" and use when it's needed.
                        console.log( 'Editor is ready to use!', editor );
                    } }
                    onChange={ ( event, editor ) => {
                        const data = editor.getData();
                        console.log( { event, editor, data } );
                    } }
                />
            </div>
        );
    }
}

export default App;

# Component properties

The <CKEditor> component supports the following properties:

editor (required) – The Editor constructor to use.
data – The initial data for the created editor. See the Basic API guide.
config – The editor configuration. See the Configuration guide.
onChange – A function called when the editor’s data changed. See the editor.model.document#change:data event.

The callback receives two parameters:
1. an EventInfo object,
2. an Editor instance.
onInit – A function called when the editor was initialized. It receives the initialized editor as a parameter.

# Customizing the builds

CKEditor 5 builds come ready to use, with a set of built-in plugins and a predefined configuration. While you can change the configuration easily by using the config property of the <CKEditor> component which allows you to change the toolbar or remove some plugins, in order to add plugins you need to rebuild the editor.

There are two main ways to do that.

Customize one of the existing builds.

This option does not require any changes in your project’s configuration. You will create a new build somewhere next to your project and include it like you included one of the existing builds. Therefore, it is the easiest way to add missing features. Read more about this method in Installing plugins.
Integrate the editor from source.

In this approach you will include CKEditor 5 from source — so you will choose the editor creator you want and the list of plugins, etc. It is more powerful and creates a tighter integration between your application and CKEditor 5, however, it requires adjusting your webpack.config.js to CKEditor 5 needs.

Read more about this option in Integrating CKEditor 5 from source.

# Note: Building for production

If you use create-react-app or use a custom configuration for you application but still use webpack@3, you will need to adjust the UglifyJsPlugin options to make CKEditor 5 compatible with this setup. CKEditor 5 builds use ES6 so the default JavaScript minifier of webpack@3 and create-react-app is not able to digest them.

To do that, you need to first eject the configuration from the setup created via create-react-app (assuming that you use it).

npm run eject

Then, you can customize UglifyJsPlugin options in the webpack configuration. Read how to do this here.

Note: The latest webpack@4 comes with a version of UglifyJsPlugin which supports ES6 out of the box. Also, the React community works on allowing importing ES6 libraries into your applications, so this step will soon be no longer required.

# Note: Using the document editor build

If you use the Document editor, you need to add the toolbar to the DOM manually:

import DecoupledEditor from '@ckeditor/ckeditor5-build-decoupled-document';

class App extends Component {
    render() {
        return (
            <div className="App">
                <h2>CKEditor 5 using a custom build - DecoupledEditor</h2>
                <CKEditor
                    onInit={ editor => {
                        console.log( 'Editor is ready to use!', editor );

                        // Insert the toolbar before the editable area.
                        editor.ui.view.editable.element.parentElement.insertBefore(
                            editor.ui.view.toolbar.element,
                            editor.ui.view.editable.element
                        );
                    } }
                    onChange={ ( event, editor ) => console.log( { event, editor } ) }
                    editor={ DecoupledEditor }
                    data="<p>Hello from CKEditor 5's DecoupledEditor!</p>"
                    config={ /* the editor configuration */ }
                />
        );
    }
}

export default App;

# Integrating CKEditor 5 from source

Integrating the editor from source allows you to use the full power of the CKEditor 5 Framework.

This guide assumes that you are using Create React App CLI as your boilerplate and it goes through adjusting it to fit CKEditor 5’s needs. If you use your custom webpack setup, please read more about including CKEditor 5 from source.

Install React CLI:

npm install -g create-react-app

Create your project using the CLI and go to the project’s directory:

create-react-app ckeditor5-react-example && cd ckeditor5-react-example

Now, you can eject the configuration:

npm run eject

You need to eject the configuration in order to be able to customize webpack configuration. In order to build CKEditor 5 from source you need to load inline SVG images and handle CKEditor 5’s CSS as well as correctly minify ES6 source.

You can find more information about ejecting here.

# Changes required in webpack’s production config

At this stage, if you would try to build your application with CKEditor 5’s source included, you would get the following error:

Failed to minify the code from this file:                                              [31/75]
        <project_root>/node_modules/@ckeditor/ckeditor5-build-classic/build/ckeditor.js:5:2077

UglifyJS exported by webpack@3 cannot parse code written in ES6. You need to manually replace it with uglifyjs-webpack-plugin. These changes touch the webpack.config.prod.js file only.

After ejecting, this file is placed in <project_root>/config/webpack.config.prod.js. You need to make the following changes:

Install uglifyjs-webpack-plugin:

npm install --save-dev uglifyjs-webpack-plugin

Load the installed package (at the top of the webpack.config.prod.js file):

const UglifyJsWebpackPlugin = require( 'uglifyjs-webpack-plugin' );

Replace the webpack.optimize.UglifyJsPlugin with UglifyJsWebpackPlugin:

- new webpack.optimize.UglifyJsPlugin
+ new UglifyJsWebpackPlugin

Options: compress, mangle and output cannot be passed directly to UglifyJsWebpackPlugin. You need to wrap these options in uglifyOptions: { ... }.

In the end, the entire plugin definition should look as follows:

// Minify the code.
new UglifyJsWebpackPlugin( {
  uglifyOptions: {
    compress: {
      warnings: false,
      // Disabled because of an issue with Uglify breaking seemingly valid code:
      // https://github.com/facebookincubator/create-react-app/issues/2376
      // Pending further investigation:
      // https://github.com/mishoo/UglifyJS2/issues/2011
      comparisons: false,
    },
    mangle: {
        safari10: true,
    },
    output: {
        comments: false,
        // Turned on because emoji and regex is not minified properly using default
        // https://github.com/facebookincubator/create-react-app/issues/2488
        ascii_only: true,
    },
  },
  sourceMap: shouldUseSourceMap,
} )

# Changes required in both webpack configs

In order to build your application properly, you need to modify your webpack configuration files. After ejecting they are located at:

<project_root>/config/webpack.config.dev.js
<project_root>/config/webpack.config.prod.js

You need to modify the webpack configuration to load CKEditor 5 SVG icons properly.

At the beginning import an object that creates the configuration for PostCSS:

const { styles } = require( '@ckeditor/ckeditor5-dev-utils' );

Then add two new elements to the exported object under the module.rules array (as new items for the oneOf array). These are SVG and CSS loaders only for CKEditor 5 code:

{
  test: /ckeditor5-[^/\\]+[/\\]theme[/\\]icons[/\\][^/\\]+\.svg$/,
  use: [ 'raw-loader' ]
},
{
  test: /ckeditor5-[^/\\]+[/\\]theme[/\\].+\.css/,
  use: [
    {
      loader: 'style-loader',
      options: {
        singleton: true
      }
    },
    {
      loader: 'postcss-loader',
      options: styles.getPostCssConfig( {
        themeImporter: {
          themePath: require.resolve( '@ckeditor/ckeditor5-theme-lark' )
        },
        minify: true
      } )
    }
  ]
},

Exclude CSS files used by CKEditor 5 from project’s CSS loader:

{
  test: /\.css$/,
  exclude: /ckeditor5-[^/\\]+[/\\]theme[/\\].+\.css/,
  // (...)
}

And exclude CKEditor 5 SVG and CSS files from file-loader because these files will be handled by the loaders added previously (usually the last item in the module.rules array is the file-loader) so it looks like this:

{
  loader: require.resolve('file-loader'),
  // Exclude `js` files to keep the "css" loader working as it injects
  // its runtime that would otherwise be processed through the "file" loader.
  // Also exclude `html` and `json` extensions so they get processed
  // by webpack's internal loaders.
  exclude: [
    /\.(js|jsx|mjs)$/,
    /\.html$/,
    /\.json$/,
    /ckeditor5-[^/\\]+[/\\]theme[/\\]icons[/\\][^/\\]+\.svg$/,
    /ckeditor5-[^/\\]+[/\\]theme[/\\].+\.css/
  ],
  options: {
    name: 'static/media/[name].[hash:8].[ext]'
  }
}

Remember that the changes above should be done in both configuration files.

Next, install raw-loader, the theme for CKEditor 5 and CKEditor 5 development utilities:

npm install --save-dev raw-loader @ckeditor/ckeditor5-theme-lark @ckeditor/ckeditor5-dev-utils

Finally, install the component, the specific editor and plugins you want to use:

npm install --save \
    @ckeditor/ckeditor5-react \
    @ckeditor/ckeditor5-editor-classic \
    @ckeditor/ckeditor5-essentials \
    @ckeditor/ckeditor5-basic-styles \
    @ckeditor/ckeditor5-heading \
    @ckeditor/ckeditor5-paragraph

# Using CKEditor 5 source

Now you can use CKEditor component together with CKEditor 5 Framework:

import React, { Component } from 'react';
import CKEditor from '@ckeditor/ckeditor5-react';

import ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';
import Essentials from '@ckeditor/ckeditor5-essentials/src/essentials';
import Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';
import Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';
import Italic from '@ckeditor/ckeditor5-basic-styles/src/italic';
import Heading from '@ckeditor/ckeditor5-heading/src/heading';

class App extends Component {
    render() {
        return (
            <div className="App">
                <h2>Using CKEditor 5 Framework in React</h2>
                <CKEditor
                    onInit={ editor => console.log( 'Editor is ready to use!', editor ) }
                    onChange={ ( event, editor ) => console.log( { event, editor } ) }
                    config={ {
                        plugins: [ Essentials, Paragraph, Bold, Italic, Heading ],
                        toolbar: [ 'heading', '|', 'bold', 'italic', '|', 'undo', 'redo', ]
                    } }
                    editor={ ClassicEditor }
                    data="<p>Hello from CKEditor 5!</p>"
                />
            </div>
        );
    }
}

export default App;

# Contributing and reporting issues

The source code of this component is available on GitHub in https://github.com/ckeditor/ckeditor5-react.