editor/source/react-mde

react-mde

A simple yet powerful and extensible Markdown Editor editor for React. React-mde is built on top of Draft.js.

Demos

• Demos.

Installing

npm i --save react-mde

Dependencies

React-mde currently depends on:

• Draft.js. This facilitates features that would otherwise be quite difficult. The best examples being history management, mentions and pasting files.

  npm i --save draft-js

• Font Awesome 5.* for the icons. This is not a hard dependency and can be changed (see the Customizing Icons section below). To use Font Awesome icons, install using your preferred method. The easiest is just add this to <head/>:

It is possible to use React-mde with Font Awesome 4 (and possibly earlier versions) – see below under ‘Customizing Icons’.

Optional dependencies

• Showdown. React-mde is not opinionated as to how to transform markdown into HTML and this can be done both in client-side, like StackOverflow, or in server-side, like GitHub. The easiest way is to use Showdown and process it in client-side. If you decide to do so, install Showdown:

  npm i --save showdown

Using

React-mde is a completely controlled component.

Minimal example using Showdown:

import * as React from "react";
import ReactMde, {ReactMdeTypes} from "../src";
import * as Showdown from "showdown";

export interface AppState {
    mdeState: ReactMdeTypes.MdeState;
}

export class App extends React.Component<{}, AppState> {

    converter: Showdown.Converter;

    constructor(props) {
        super(props);
        this.state = {
            mdeState: null,
        };
        this.converter = new Showdown.Converter({tables: true, simplifiedAutoLink: true});
    }

    handleValueChange = (mdeState: ReactMdeTypes.MdeState) => {
        this.setState({mdeState});
    }

    render() {
        return (
            <div className="container">
                <ReactMde
                    onChange={this.handleValueChange}
                    editorState={this.state.mdeState}
                    generateMarkdownPreview={(markdown) => Promise.resolve(this.converter.makeHtml(markdown))}
                />
            </div>
        );
    }
}

Customizing Icons

By default, React-mde will use Font Awesome class names to render icons (see above for how to install). The default icon provider returns icons that look like the following:

<i className={`fas fa-${icon}`} aria-hidden="true"/>

This can be changed by passing a buttonContentOptions prop to the ReactMde component with an iconProvider option to tell React-mde how to render icons.

For example, you can use your own custom icon component by changing the iconProvider:

<ReactMde
    buttonContentOptions={{
        iconProvider: name => <MyCustomIcon name={name} />,
    }}
    onChange={this.handleValueChange}
    // ...
/>

In order to use Font Awesome 4 classes, you can pass the following prop:

buttonContentOptions={{
    iconProvider: name => <i className={`fa fa-${name}`} />,
}}

This will cause React-mde to use FA4-style classnames.

Custom props

See docs

React-mde Props

The types are described below

• editorState: MdeState: The state of the editor. It contains the markdown, the HTML and the underlying Draft.js state. However, only markdown is supposed to be passed by the user on the first call. Both html and draftEditorState will be generated by React-mde and passed back to the user through the onChange callback. It is important to notice that, even though on the first call, editorState is supposed to be something like {markdown:'Hello!}`, on the subsequent calls, editorState should be the object returned by the onChange callback.
• className?: string: Optional class name to be added to the top level element.
• commands?: Command[][]: An array of array of commands. If no commands are specified, the default will be used. Commands are explained in more details below.
• buttonContentOptions?: { iconProvider: (iconName: string) => React.ReactNode } An optional set of button content options, including an iconProvider to allow custom icon rendering.
• onChange: (value: MdeState) => void: Event handler for the onChange event.
• generateMarkdownPreview: (markdown: string) => Promise;: Function that should return the generated HTML for the preview. If this prop is falsy, then no preview is going to be generated.
• layout?: string: The name of the layout to be used. For now, the supported layouts are : vertical, horizontal, tabbed and noPreview.
• layoutOptions?: any: An object with options to be passed to the layout-component. Each layout may or may not expect options. It is recommended to inspect the layouts source code to see what options can be passed to each while the documentation is not complete. -- readOnly?: boolean: Flag to render the editor in read-only mode.

Styling

The following styles from React-mde should be added: (Both .scss and .css files are available. No need to use sass-loader if you don’t want)

Easiest way: import react-mde-all.css:

import 'react-mde/lib/styles/css/react-mde-all.css';

If you want to have a more granular control over the styles, you can import each individual file.

If you’re using SASS, you can override these variables: https://github.com/andrerpena/react-mde/blob/master/src/styles/variables.scss

You also need Font Awesome for the toolbar icons. Font Awesome 5 can be installed in different ways, but the easiest is just adding this to the <head/>:

<script defer src="https://use.fontawesome.com/releases/v5.0.6/js/all.js"></script>

XSS concerns

React-mde does not automatically sanitize the HTML preview. If your using Showdown, this has been taken from their documentation):

Cross-side scripting is a well known technique to gain access to private information of the users of a website. The attacker injects spurious HTML content (a script) on the web page which will read the user’s cookies and do something bad with it (like steal credentials). As a countermeasure, you should filter any suspicious content coming from user input. Showdown doesn’t include an XSS filter, so you must provide your own. But be careful in how you do it…

You might want to take a look at showdown-xss-filter.

Commands

React-mde allows you to use the build-in commands, implement your own commands, or both. If you wish to implement your own commands, please refer to the commands source code to understand how they should be implemented.

Composition and custom layouts

React-mde is designed to be composable and to facilitate new layouts:

Programmatically controlling text and selection

DraftUtil.buildNewMdeState can be used to programmatically create a new state based on the current state. Example with a button that duplicates the text. For the initial state, you can just pass null to editorState and React-Mde will build a new MdeState and call onChange with the first MdeState

Change log / Migrating from older versions

Instructions here.

Roadmap

Check the project here: https://github.com/andrerpena/react-mde/projects/1

Licence

React-mde is MIT licensed.

About the author

Made with :heart: by André Pena and other awesome contributors. Check out my website: http://andrerpena.me.