md-editor

md-editor 带有预览功能的简单 Markdown 编辑器，使用 React.js 和 TypeScript 实现。 提供具有语法突出显示，自动按需懒加载 prismjs 的 187 种语言高亮的简单 Markdown 编辑器。 这基于 textarea 封装，因此它不依赖于任何现代代码编辑器，如 Acs，CodeMirror，Monaco 等，同时支持工具栏高度定制。

特征

• �� 通过按Tab键缩进行或选定的文本，并使用可自定义的缩进。
• ♻️ 基于 textarea 封装，不依赖于任何现代代码编辑器。
• �� 不依赖 uiw 中的任何组件。
• �� 新行上的自动有序无需列表。
• ��支持自动按需懒加载 prismjs 的 187 种语言高亮。
• ��支持编辑和预览滚动条联动效果。
• ��Gitee 实例预览：https://uiw.gitee.io/react-md-editor/
• ��Github 实例预览：https://uiwjs.github.io/react-md-editor/ 
• ��CodeSandbox 实例预览

快速开始

npm i @uiw/react-md-editor

使用

import React from "react";
import ReactDOM from "react-dom";
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} />
    </div>
  );
}

自定义工具栏

import React from "react";
import ReactDOM from "react-dom";
import MDEditor, { commands } from '@uiw/react-md-editor';

const title3: commands.ICommand = {
  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: commands.TextState, api: commands.TextApi) => {
    let modifyText = `### ${state.selectedText}\n`;
    if (!state.selectedText) {
      modifyText = `### `;
    }
    api.replaceSelection(modifyText);
  },
};

export default function App() {
  const [value, setValue] = React.useState("**Hello world!!!**");
  return (
    <div className="container">
      <MDEditor
        value="Hello Markdown!"
        commands={[
          commands.bold, commands.hr, commands.italic, commands.divider, commands.codeEdit, commands.codeLive, commands.codePreview, commands.divider,
          commands.fullscreen, 
          // Custom Toolbars
          title3,
        ]}
      />
    </div>
  );
}

单独预览 Markdown

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>
  );
}

支持自定义 KaTeX 预览

KaTeX 是一个快速，易于使用的 JavaScript 库，用于在 Web 上进行 TeX 数学渲染，我们通过 KaTeX执行数学渲染。

以下实例是在 CodeSandbox 中的预览效果

npm install katex

import React from "react";
import ReactDOM from "react-dom";
import MDEditor from '@uiw/react-md-editor';
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}
\`\`\`
`;

const renderers = {
  inlineCode: ({ children }) => {
    if (/^\$\$(.*)\$\$/.test(children)) {
      const html = katex.renderToString(children.replace(/^\$\$(.*)\$\$/, '$1'), {
        throwOnError: false,
      });
      return <code dangerouslySetInnerHTML={{ __html: html }} />
    }
    return children;
  },
  code: ({ children, language, value }) => {
    if (language.toLocaleLowerCase() === 'katex') {
      const html = katex.renderToString(value, {
        throwOnError: false
      });
      return (
        <pre>
          <code dangerouslySetInnerHTML={{ __html: html }} />
        </pre>
      );
    }
    return children;
  }
}

export default function App() {
  return (
    <MDEditor value={mdKaTeX} previewOptions={{ renderers: renderers }} />
  );
}