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A simple markdown editor with preview, implemented with React.js and TypeScript. This React Component aims to provide a simple Markdown editor with syntax highlighting support. This is based on textarea encapsulation, so it does not depend on any modern code editors such as Acs, CodeMirror, Monaco etc.
textarea encapsulation, does not depend on any modern code editors.uiw component library.npm i @uiw/react-md-editor
import React from "react";
import MDEditor from '@uiw/react-md-editor';
export default function App() {
const [value, setValue] = React.useState("**Hello world!!!**");
return (
<div className="container">
<MDEditor
value={value}
onChange={setValue}
/>
<MDEditor.Markdown source={value} style={{ whiteSpace: 'pre-wrap' }} />
</div>
);
}
Supports for CSS Style
Use HTML comments <!--rehype:xxx--> to let Markdown support style customization.
## Title
<!--rehype:style=display: flex; height: 230px; align-items: center; justify-content: center; font-size: 38px;-->
Markdown Supports **Style**<!--rehype:style=color: red;-->
Ignore content display via HTML comments
Shown in GitHub readme, excluded in HTML.
# Hello World
<!--rehype:ignore:start-->Hello World<!--rehype:ignore:end-->
Good!
Output:
<h1>Hello World</h1>
<p>Good!</p>
Please note markdown needs to be sanitized if you do not completely trust your authors. Otherwise, your app is vulnerable to XSS. This can be achieved by adding rehype-sanitize as a plugin.
import React from "react";
import MDEditor from '@uiw/react-md-editor';
import rehypeSanitize from "rehype-sanitize";
export default function App() {
const [value, setValue] = React.useState(`**Hello world!!!** <IFRAME SRC=\"javascript:javascript:alert(window.origin);\"></IFRAME>`);
return (
<div className="container">
<MDEditor
value={value}
onChange={setValue}
previewOptions={{
rehypePlugins: [[rehypeSanitize]],
}}
/>
</div>
);
}
import React from "react";
import MDEditor, { commands } from '@uiw/react-md-editor';
const title3 = {
name: 'title3',
keyCommand: 'title3',
buttonProps: { 'aria-label': 'Insert title3' },
icon: (
<svg width="12" height="12" viewBox="0 0 520 520">
<path fill="currentColor" d="M15.7083333,468 C7.03242448,468 0,462.030833 0,454.666667 L0,421.333333 C0,413.969167 7.03242448,408 15.7083333,408 L361.291667,408 C369.967576,408 377,413.969167 377,421.333333 L377,454.666667 C377,462.030833 369.967576,468 361.291667,468 L15.7083333,468 Z M21.6666667,366 C9.69989583,366 0,359.831861 0,352.222222 L0,317.777778 C0,310.168139 9.69989583,304 21.6666667,304 L498.333333,304 C510.300104,304 520,310.168139 520,317.777778 L520,352.222222 C520,359.831861 510.300104,366 498.333333,366 L21.6666667,366 Z M136.835938,64 L136.835937,126 L107.25,126 L107.25,251 L40.75,251 L40.75,126 L-5.68434189e-14,126 L-5.68434189e-14,64 L136.835938,64 Z M212,64 L212,251 L161.648438,251 L161.648438,64 L212,64 Z M378,64 L378,126 L343.25,126 L343.25,251 L281.75,251 L281.75,126 L238,126 L238,64 L378,64 Z M449.047619,189.550781 L520,189.550781 L520,251 L405,251 L405,64 L449.047619,64 L449.047619,189.550781 Z" />
</svg>
),
execute: (state, api) => {
let modifyText = `### ${state.selectedText}\n`;
if (!state.selectedText) {
modifyText = `### `;
}
api.replaceSelection(modifyText);
},
};
const title2 = {
name: 'title2',
keyCommand: 'title2',
render: (command, disabled, executeCommand) => {
return (
<button
aria-label="Insert title2"
disabled={disabled}
onClick={(evn) => {
// evn.stopPropagation();
executeCommand(command, command.groupName)
}}
>
<svg width="12" height="12" viewBox="0 0 520 520">
<path fill="currentColor" d="M15.7083333,468 C7.03242448,468 0,462.030833 0,454.666667 L0,421.333333 C0,413.969167 7.03242448,408 15.7083333,408 L361.291667,408 C369.967576,408 377,413.969167 377,421.333333 L377,454.666667 C377,462.030833 369.967576,468 361.291667,468 L15.7083333,468 Z M21.6666667,366 C9.69989583,366 0,359.831861 0,352.222222 L0,317.777778 C0,310.168139 9.69989583,304 21.6666667,304 L498.333333,304 C510.300104,304 520,310.168139 520,317.777778 L520,352.222222 C520,359.831861 510.300104,366 498.333333,366 L21.6666667,366 Z M136.835938,64 L136.835937,126 L107.25,126 L107.25,251 L40.75,251 L40.75,126 L-5.68434189e-14,126 L-5.68434189e-14,64 L136.835938,64 Z M212,64 L212,251 L161.648438,251 L161.648438,64 L212,64 Z M378,64 L378,126 L343.25,126 L343.25,251 L281.75,251 L281.75,126 L238,126 L238,64 L378,64 Z M449.047619,189.550781 L520,189.550781 L520,251 L405,251 L405,64 L449.047619,64 L449.047619,189.550781 Z" />
</svg>
</button>
)
},
execute: (state, api) => {
let modifyText = `## ${state.selectedText}\n`;
if (!state.selectedText) {
modifyText = `## `;
}
api.replaceSelection(modifyText);
},
}
export default function App() {
const [value, setValue] = React.useState("Hello Markdown! `Tab` key uses default behavior");
return (
<div className="container">
<MDEditor
value={value}
onChange={setValue}
commands={[
// Custom Toolbars
title3, title2,
commands.group([commands.title1, commands.title2, commands.title3, commands.title4, commands.title5, commands.title6], {
name: 'title',
groupName: 'title',
buttonProps: { 'aria-label': 'Insert title'}
}),
commands.divider,
commands.group([], {
name: 'update',
groupName: 'update',
icon: (
<svg viewBox="0 0 1024 1024" width="12" height="12">
<path fill="currentColor" d="M716.8 921.6a51.2 51.2 0 1 1 0 102.4H307.2a51.2 51.2 0 1 1 0-102.4h409.6zM475.8016 382.1568a51.2 51.2 0 0 1 72.3968 0l144.8448 144.8448a51.2 51.2 0 0 1-72.448 72.3968L563.2 541.952V768a51.2 51.2 0 0 1-45.2096 50.8416L512 819.2a51.2 51.2 0 0 1-51.2-51.2v-226.048l-57.3952 57.4464a51.2 51.2 0 0 1-67.584 4.2496l-4.864-4.2496a51.2 51.2 0 0 1 0-72.3968zM512 0c138.6496 0 253.4912 102.144 277.1456 236.288l10.752 0.3072C924.928 242.688 1024 348.0576 1024 476.5696 1024 608.9728 918.8352 716.8 788.48 716.8a51.2 51.2 0 1 1 0-102.4l8.3968-0.256C866.2016 609.6384 921.6 550.0416 921.6 476.5696c0-76.4416-59.904-137.8816-133.12-137.8816h-97.28v-51.2C691.2 184.9856 610.6624 102.4 512 102.4S332.8 184.9856 332.8 287.488v51.2H235.52c-73.216 0-133.12 61.44-133.12 137.8816C102.4 552.96 162.304 614.4 235.52 614.4l5.9904 0.3584A51.2 51.2 0 0 1 235.52 716.8C105.1648 716.8 0 608.9728 0 476.5696c0-132.1984 104.8064-239.872 234.8544-240.2816C258.5088 102.144 373.3504 0 512 0z" />
</svg>
),
children: ({ close, execute, getState, textApi }) => {
return (
<div style={{ width: 120, padding: 10 }}>
<div>My Custom Toolbar</div>
<button type="button" onClick={() => console.log('> execute: >>>>>', getState())}>State</button>
<button type="button" onClick={() => close()}>Close</button>
<button type="button" onClick={() => execute()}>Execute</button>
</div>
);
},
execute: (state, api) => {
console.log('>>>>>>update>>>>>', state)
},
buttonProps: { 'aria-label': 'Insert title'}
}),
]}
/>
</div>
);
}
Customize the toolbar with commands and extraCommands props.
import React from "react";
import MDEditor, { commands } from '@uiw/react-md-editor';
export default function App() {
const [value, setValue] = React.useState("Hello Markdown! `Tab` key uses default behavior");
return (
<div className="container">
<MDEditor
value={value}
onChange={setValue}
preview="edit"
commands={[
commands.codeEdit, commands.codePreview
]}
extraCommands={[
commands.group([commands.title1, commands.title2, commands.title3, commands.title4, commands.title5, commands.title6], {
name: 'title',
groupName: 'title',
buttonProps: { 'aria-label': 'Insert title'}
}),
commands.divider,
commands.group([], {
name: 'update',
groupName: 'update',
icon: (
<svg viewBox="0 0 1024 1024" width="12" height="12">
<path fill="currentColor" d="M716.8 921.6a51.2 51.2 0 1 1 0 102.4H307.2a51.2 51.2 0 1 1 0-102.4h409.6zM475.8016 382.1568a51.2 51.2 0 0 1 72.3968 0l144.8448 144.8448a51.2 51.2 0 0 1-72.448 72.3968L563.2 541.952V768a51.2 51.2 0 0 1-45.2096 50.8416L512 819.2a51.2 51.2 0 0 1-51.2-51.2v-226.048l-57.3952 57.4464a51.2 51.2 0 0 1-67.584 4.2496l-4.864-4.2496a51.2 51.2 0 0 1 0-72.3968zM512 0c138.6496 0 253.4912 102.144 277.1456 236.288l10.752 0.3072C924.928 242.688 1024 348.0576 1024 476.5696 1024 608.9728 918.8352 716.8 788.48 716.8a51.2 51.2 0 1 1 0-102.4l8.3968-0.256C866.2016 609.6384 921.6 550.0416 921.6 476.5696c0-76.4416-59.904-137.8816-133.12-137.8816h-97.28v-51.2C691.2 184.9856 610.6624 102.4 512 102.4S332.8 184.9856 332.8 287.488v51.2H235.52c-73.216 0-133.12 61.44-133.12 137.8816C102.4 552.96 162.304 614.4 235.52 614.4l5.9904 0.3584A51.2 51.2 0 0 1 235.52 716.8C105.1648 716.8 0 608.9728 0 476.5696c0-132.1984 104.8064-239.872 234.8544-240.2816C258.5088 102.144 373.3504 0 512 0z" />
</svg>
),
children: ({ close, execute, getState, textApi }) => {
return (
<div style={{ width: 120, padding: 10 }}>
<div>My Custom Toolbar</div>
<button type="button" onClick={() => console.log('> execute: >>>>>', getState())}>State</button>
<button type="button" onClick={() => close()}>Close</button>
<button type="button" onClick={() => execute()}>Execute</button>
</div>
);
},
execute: (state, api) => {
console.log('>>>>>>update>>>>>', state)
},
buttonProps: { 'aria-label': 'Insert title'}
}),
commands.divider, commands.fullscreen
]}
/>
</div>
);
}
re-render toolbar element.
import React from "react";
import MDEditor, { commands } from '@uiw/react-md-editor';
export default function App() {
const [value, setValue] = React.useState("Hello Markdown! `Tab` key uses default behavior");
return (
<div className="container">
<MDEditor
value={value}
onChange={setValue}
preview="edit"
components={{
toolbar: (command, disabled, executeCommand) => {
if (command.keyCommand === 'code') {
return (
<button
aria-label="Insert code"
disabled={disabled}
onClick={(evn) => {
evn.stopPropagation();
executeCommand(command, command.groupName)
}}
>
Code
</button>
)
}
}
}}
/>
</div>
);
}
Custom Preview Command Tool
import React, { useContext } from "react";
import MDEditor, { commands, EditorContext } from "@uiw/react-md-editor";
const Button = () => {
const { preview, dispatch } = useContext(EditorContext);
const click = () => {
dispatch({
preview: preview === "edit" ? "preview" : "edit"
});
};
if (preview === "edit") {
return (
<svg width="12" height="12" viewBox="0 0 520 520" onClick={click}>
<polygon
fill="currentColor"
points="0 71.293 0 122 319 122 319 397 0 397 0 449.707 372 449.413 372 71.293"
/>
<polygon
fill="currentColor"
points="429 71.293 520 71.293 520 122 481 123 481 396 520 396 520 449.707 429 449.413"
/>
</svg>
);
}
return (
<svg width="12" height="12" viewBox="0 0 520 520" onClick={click}>
<polygon
fill="currentColor"
points="0 71.293 0 122 38.023 123 38.023 398 0 397 0 449.707 91.023 450.413 91.023 72.293"
/>
<polygon
fill="currentColor"
points="148.023 72.293 520 71.293 520 122 200.023 124 200.023 397 520 396 520 449.707 148.023 450.413"
/>
</svg>
);
};
const codePreview = {
name: "preview",
keyCommand: "preview",
value: "preview",
icon: <Button />
};
export default function App() {
const [value, setValue] = React.useState("**Hello world!!!**");
return (
<div className="container">
<div>The system automatically sets the theme</div>
<MDEditor
value={value}
preview="edit"
extraCommands={[codePreview, commands.fullscreen]}
onChange={(val) => setValue(val)}
/>
</div>
);
}
.w-md-editor-text-pre > code,
.w-md-editor-text-input {
font-size: 23px !important;
line-height: 24px !important;
}
import React from "react";
import ReactDOM from "react-dom";
import MDEditor from '@uiw/react-md-editor';
export default function App() {
return (
<div className="container">
<MDEditor.Markdown source="Hello Markdown!" />
</div>
);
}
KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web, We perform math rendering through KaTeX.
The following example is preview in CodeSandbox.
⚠️ Upgrade v2 to v3 d025430
npm install katex
import React from "react";
import ReactDOM from "react-dom";
import MDEditor from '@uiw/react-md-editor';
import { getCodeString } from 'rehype-rewrite';
import katex from 'katex';
import 'katex/dist/katex.css';
const mdKaTeX = `This is to display the
\`\$\$\c = \\pm\\sqrt{a^2 + b^2}\$\$\`
in one line
\`\`\`KaTeX
c = \\pm\\sqrt{a^2 + b^2}
\`\`\`
`;
export default function App() {
return (
<MDEditor
value={mdKaTeX}
previewOptions={{
components: {
code: ({ inline, children = [], className, ...props }) => {
const txt = children[0] || '';
if (inline) {
if (typeof txt === 'string' && /^\$\$(.*)\$\$/.test(txt)) {
const html = katex.renderToString(txt.replace(/^\$\$(.*)\$\$/, '$1'), {
throwOnError: false,
});
return <code dangerouslySetInnerHTML={{ __html: html }} />;
}
return <code>{txt}</code>;
}
const code = props.node && props.node.children ? getCodeString(props.node.children) : txt;
if (
typeof code === 'string' &&
typeof className === 'string' &&
/^language-katex/.test(className.toLocaleLowerCase())
) {
const html = katex.renderToString(code, {
throwOnError: false,
});
return <code style={{ fontSize: '150%' }} dangerouslySetInnerHTML={{ __html: html }} />;
}
return <code className={String(className)}>{txt}</code>;
},
},
}}
/>
);
}
import React, { useState } from "react";
import MDEditor, { commands, ICommand, TextState, TextAreaTextApi } from "@uiw/react-md-editor";
import domToImage from "dom-to-image";
const textToImage: ICommand = {
name: "Text To Image",
keyCommand: "text2image",
buttonProps: { "aria-label": "Insert title3" },
icon: (
<svg width="12" height="12" viewBox="0 0 20 20">
<path fill="currentColor" d="M15 9c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm4-7H1c-.55 0-1 .45-1 1v14c0 .55.45 1 1 1h18c.55 0 1-.45 1-1V3c0-.55-.45-1-1-1zm-1 13l-6-5-2 2-4-5-4 8V4h16v11z" ></path>
</svg>
),
execute: (state: TextState, api: TextAreaTextApi) => {
const dom = document.getElementsByClassName("gooooooooo")[0];
if (dom) {
domToImage.toJpeg(dom, {}).then((dataUrl) => {
const link = document.createElement("a");
link.download = "image.jpg";
link.href = dataUrl;
link.click();
});
}
}
};
export default function App() {
const [value, setValue] = useState('**Hello world!!!**');
console.log('value::', value)
return (
<div className="container">
<MDEditor
className="gooooooooo"
onChange={(newValue = "") => setValue(newValue)}
value={value}
commands={[
textToImage,
commands.divider
]}
/>
</div>
);
}
Using mermaid to generation of diagram and flowchart from text in a similar manner as markdown
npm install mermaid
import React, { useState, useRef, useEffect } from "react";
import ReactDOM from "react-dom";
import MDEditor from "@uiw/react-md-editor";
import mermaid from "mermaid";
const mdMermaid = `The following are some examples of the diagrams, charts and graphs that can be made using Mermaid and the Markdown-inspired text specific to it.
\`\`\`mermaid
graph TD
A[Hard] -->|Text| B(Round)
B --> C{Decision}
C -->|One| D[Result 1]
C -->|Two| E[Result 2]
\`\`\`
\`\`\`mermaid
sequenceDiagram
Alice->>John: Hello John, how are you?
loop Healthcheck
John->>John: Fight against hypochondria
end
Note right of John: Rational thoughts!
John-->>Alice: Great!
John->>Bob: How about you?
Bob-->>John: Jolly good!
\`\`\`
`;
const randomid = () => parseInt(String(Math.random() * 1e15), 10).toString(36);
const Code = ({ inline, children = [], className, ...props }) => {
const demoid = useRef(`dome${randomid()}`);
const code = getCode(children);
const demo = useRef(null);
useEffect(() => {
if (demo.current) {
try {
const str = mermaid.render(demoid.current, code, () => null, demo.current);
// @ts-ignore
demo.current.innerHTML = str;
} catch (error) {
// @ts-ignore
demo.current.innerHTML = error;
}
}
}, [code, demo]);
if (
typeof code === "string" && typeof className === "string" &&
/^language-mermaid/.test(className.toLocaleLowerCase())
) {
return (
<code ref={demo}>
<code id={demoid.current} style={{ display: "none" }} />
</code>
);
}
return <code className={String(className)}>{children}</code>;
};
const getCode = (arr = []) => arr.map((dt) => {
if (typeof dt === "string") {
return dt;
}
if (dt.props && dt.props.children) {
return getCode(dt.props.children);
}
return false;
}).filter(Boolean).join("");
export default function App() {
const [value, setValue] = useState(mdMermaid);
return (
<MDEditor
onChange={(newValue = "") => setValue(newValue)}
textareaProps={{
placeholder: "Please enter Markdown text"
}}
height={500}
value={value}
previewOptions={{
components: {
code: Code
}
}}
/>
);
}
Use examples in nextjs. #52 #224
npm install next-remove-imports
npm install @uiw/react-md-editor@v3.6.0
// next.config.js
const removeImports = require('next-remove-imports')();
module.exports = removeImports({});
import "@uiw/react-md-editor/markdown-editor.css";
import "@uiw/react-markdown-preview/markdown.css";
import dynamic from "next/dynamic";
import { useState } from "react";
const MDEditor = dynamic(
() => import("@uiw/react-md-editor"),
{ ssr: false }
);
function HomePage() {
const [value, setValue] = useState("**Hello world!!!**");
return (
<div>
<MDEditor value={value} onChange={setValue} />
</div>
);
}
export default HomePage;
By default, the dark-mode is automatically switched according to the system. If you need to switch manually, just set the data-color-mode="dark" parameter for body.
<html data-color-mode="dark">
document.documentElement.setAttribute('data-color-mode', 'dark')
document.documentElement.setAttribute('data-color-mode', 'light')
Inherit custom color variables by adding .wmde-markdown-var selector. Setting theme styles with data-color-mode="light".
<div data-color-mode="light">
<div className="wmde-markdown-var"> </div>
<MDEditor source="Hello World!" />
</div>
value: string: The Markdown value.onChange?: (value?: string, event?: React.ChangeEvent<HTMLTextAreaElement>, state?: ContextStore): Event handler for the onChange event.onHeightChange?: ((value?: CSSProperties['height'], oldValue?: CSSProperties['height'], state?: ContextStore): editor height change listener.commands?: ICommand[]: An array of ICommand, which, each one, contain a commands property. If no commands are specified, the default will be used. Commands are explained in more details below.commandsFilter?: (command: ICommand, isExtra: boolean) => false | ICommand: Filter or modify your commands.extraCommands?: ICommand[]: Displayed on the right side of the toolbar.autoFocus?: true: Can be used to make Markdown Editor focus itself on initialization.previewOptions?: ReactMarkdown.ReactMarkdownProps: This is reset @uiw/react-markdown-preview settings.textareaProps?: TextareaHTMLAttributes: Set the textarea related props.renderTextarea?: (props, opts) => JSX.Element;@deprecated Please use renderTextareacomponents. Use div to replace TextArea or re-render TextArea. #193
components: re-render textarea/toolbar element. #419
textarea Use div to replace TextArea or re-render TextAreatoolbar Override the default command element. toolbar < command[].render
preview Custom markdown preview. #429
height?: number=200: The height of the editor. ️⚠️ Dragbar is invalid when height parameter percentage.visibleDragbar?: boolean=true: Show drag and drop tool. Set the height of the editor.highlightEnable?: boolean=true: Disable editing area code highlighting. The value is false, which increases the editing speed.fullscreen?: boolean=false: Show markdown preview.overflow?: boolean=true: Disable fullscreen setting body stylespreview?: 'live' | 'edit' | 'preview': Default value live, Show markdown preview.maxHeight?: number=1200: Maximum drag height. The visibleDragbar=true value is valid.minHeights?: number=100: Minimum drag height. The visibleDragbar=true value is valid.tabSize?: number=2: The number of characters to insert when pressing tab key. Default 2 spaces.defaultTabEnable?: boolean=false: If false, the tab key inserts a tab character into the textarea. If true, the tab key executes default behavior e.g. focus shifts to next element.hideToolbar?: boolean=false: Option to hide the tool bar.enableScroll?: boolean=true: Whether to enable scrolling.npm run watch # Listen create type and .tsx files.
npm run css:watch # listen to the component compile and output the .css file
npm run start # Preview code example.
As always, thanks to our amazing contributors!
Made with github-action-contributors.
Licensed under the MIT License.
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