React Textarea Code Editor

A simple code editor with syntax highlighting. This library aims to provide a simple code editor with syntax highlighting support without any of the extra features, perfect for simple embeds and forms where users can submit code.

Features:

🌒 Support dark-mode/night-mode @v2.
☕️ Automatic syntax highlighting.
🐲 Automatic indent on new lines.
🩲 Indent line or selected text by pressing tab key, with customizable indentation.
🌸 Wrap selected text in parens, [], (), <>, {}, "", '', "", ``
💡 Support next.js, Use examples in next.js.

Install

$ npm i @uiw/react-textarea-code-editor

Demo & Document

https://uiwjs.github.io/react-textarea-code-editor/

Usage

import React, { useState } from "react";
import CodeEditor from '@uiw/react-textarea-code-editor';

export default function App() {
  const [code, setCode] = useState(
    `function add(a, b) {\n  return a + b;\n}`
  );
  return (
    <CodeEditor
      value={code}
      language="js"
      placeholder="Please enter JS code."
      onChange={(evn) => setCode(evn.target.value)}
      padding={15}
      style={{
        backgroundColor: "#f5f5f5",
        fontFamily: 'ui-monospace,SFMono-Regular,SF Mono,Consolas,Liberation Mono,Menlo,monospace',
      }}
    />
  );
}

Highlight line or character

List of rehype plugins to use.

import CodeEditor from '@uiw/react-textarea-code-editor';
import rehypePrism from "rehype-prism-plus";
import rehypeRewrite from "rehype-rewrite";
import "./styles.css";

function App() {
  const [code, setCode] = React.useState(
    `function add(a, b) {\n  return a + b;\n}`
  );
  return (
    <CodeEditor
      value={code}
      language="js"
      placeholder="Please enter JS code."
      onChange={(evn) => setCode(evn.target.value)}
      padding={15}
      rehypePlugins={[
        [rehypePrism, { ignoreMissing: true }],
        [
          rehypeRewrite,
          {
            rewrite: (node, index, parent) => {
              if (node.properties?.className?.includes("code-line")) {
                if (index === 0 && node.properties?.className) {
                  node.properties.className.push("demo01");
                  // console.log("~~~", index, node.properties?.className);
                }
              }
              if (node.type === "text" && node.value === "return" && parent.children.length === 1) {
                parent.properties.className.push("demo123");
              }
            }
          }
        ]
      ]}
      style={{
        fontSize: 12,
        backgroundColor: "#f5f5f5",
        fontFamily: 'ui-monospace,SFMono-Regular,SF Mono,Consolas,Liberation Mono,Menlo,monospace',
      }}
    />
  );
}

Remove Code Highlight

The following example can help you exclude code highlighting code from being included in the bundle. @uiw/react-textarea-code-editor/nohighlight component does not contain the ~~rehype-prism-plus~~ code highlighting package.

import React, { useState } from "react";
import CodeEditor from '@uiw/react-textarea-code-editor/nohighlight';

export default function App() {
  const [code, setCode] = useState(
    `function add(a, b) {\n  return a + b;\n}`
  );
  return (
    <CodeEditor
      value={code}
      language="js"
      placeholder="Please enter JS code."
      onChange={(evn) => setCode(evn.target.value)}
      padding={15}
      style={{
        backgroundColor: "#f5f5f5",
        fontFamily: 'ui-monospace,SFMono-Regular,SF Mono,Consolas,Liberation Mono,Menlo,monospace',
      }}
    />
  );
}

Show LineNumbers

import rehypePrism from 'rehype-prism-plus';
import React, { useState } from "react";
import CodeEditor from '@uiw/react-textarea-code-editor';

export default function App() {
  const [code, setCode] = useState(
    `function add(a, b) {\n  return a + b;\n}`
  );
  return (
    <CodeEditor
      value={code}
      language="js"
      placeholder="Please enter JS code."
      onChange={(evn) => setCode(evn.target.value)}
      rehypePlugins={[
        [rehypePrism, { ignoreMissing: true, showLineNumbers: true }]
      ]}
      style={{
        backgroundColor: "#f5f5f5",
        fontFamily: 'ui-monospace,SFMono-Regular,SF Mono,Consolas,Liberation Mono,Menlo,monospace',
      }}
    />
  );
}

Support Nextjs

Use examples in nextjs. #31

npm install next-remove-imports
npm install @uiw/react-textarea-code-editor@v1.4.4

// next.config.js
const removeImports = require("next-remove-imports")();
module.exports = removeImports({
  experimental: { esmExternals: true }
});

import React from "react";
import dynamic from "next/dynamic";
import "@uiw/react-textarea-code-editor/dist.css";

const CodeEditor = dynamic(
  () => import("@uiw/react-textarea-code-editor").then((mod) => mod.default),
  { ssr: false }
);

function HomePage() {
  const [code, setCode] = React.useState(
    `function add(a, b) {\n  return a + b;\n}`
  );
  return (
    <div>
      <CodeEditor
        value={code}
        language="js"
        placeholder="Please enter JS code."
        onChange={(evn) => setCode(evn.target.value)}
        padding={15}
        style={{
          fontSize: 12,
          backgroundColor: "#f5f5f5",
          fontFamily:
            "ui-monospace,SFMono-Regular,SF Mono,Consolas,Liberation Mono,Menlo,monospace"
        }}
      />
    </div>
  );
}

export default HomePage;

Support dark-mode/night-mode

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 html Element.

<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 .w-tc-editor-var selector.

const Demo = () => {
  return (
    <div>
      <div className="w-tc-editor-var"> </div>
      <CodeEditor value={code} />
    </div>
  )
}

Set (data-color-mode="dark") dark theme.

import CodeEditor from '@uiw/react-textarea-code-editor';

function App() {
  return (
    <CodeEditor
      value="function add(a, b) {\n  return a + b;\n}"
      data-color-mode="dark"
    />
  );
}

Props

interface TextareaCodeEditorProps extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {
  prefixCls?: string;
  /**
   * Support dark-mode/night-mode
   */
  ['data-color-mode']?: 'dark' | 'light';
  /**
   * Set what programming language the code belongs to.
   */
  language?: string;
  /**
   * Optional padding for code. Default: `10`.
   */
  padding?: number;
  /**
   * rehypePlugins (Array.<Plugin>, default: `[[rehypePrism, { ignoreMissing: true }]]`)  
   * List of [rehype plugins](https://github.com/rehypejs/rehype/blob/main/doc/plugins.md#list-of-plugins) to use. See the next section for examples on how to pass options
   */
  rehypePlugins?: PluggableList;
  /**
   * The minimum height of the editor. Default: `16`.
   */
  minHeight?: number;
  onKeyDown?: (event: React.KeyboardEvent<HTMLTextAreaElement>) => void | boolean;
  /**
   * The number of spaces for indentation when pressing tab key. Default: `2`.
   */
  indentWidth?: number
}

List of supported languages can be found here

Development

Runs the project in development mode.

# Step 1, run first, listen to the component compile and output the .js file
# listen for compilation output type .d.ts file
npm run watch
# Step 2, development mode, listen to compile preview website instance
npm run start

production

Builds the app for production to the build folder.

npm run build

The build is minified and the filenames include the hashes. Your app is ready to be deployed!

Contributors

As always, thanks to our amazing contributors!

Made with github-action-contributors.

License

Licensed under the MIT License.

uiwjs/react-textarea-code-editor