React Html Editor - Markdown Support

import React, { useCallback, useState } from 'react';

import { unified } from 'unified';

import remarkParse from 'remark-parse';

import remarkRehype from 'remark-rehype';

import remarkStringify from 'remark-stringify';

import rehypeParse from 'rehype-parse';

import rehypeRemark from 'rehype-remark';

import rehypeStringify from 'rehype-stringify';

import HtmlEditor, { Toolbar, Item } from 'devextreme-react/html-editor';

import { markup } from './data.js';

​

const headerValues = [false, 1, 2, 3, 4, 5];

const headerOptions = {

  inputAttr: {

    'aria-label': 'Header',

  },

};

const converter = {

  toHtml(value) {

    const result = unified()

      .use(remarkParse)

      .use(remarkRehype)

      .use(rehypeStringify)

      .processSync(value)

      .toString();

    return result;

  },

  fromHtml(value) {

    const result = unified()

      .use(rehypeParse)

      .use(rehypeRemark)

      .use(remarkStringify)

      .processSync(value)

      .toString();

    return result;

  },

};

export default function App() {

  const [valueContent, setValueContent] = useState(markup);

  const valueChanged = useCallback(

    (e) => {

      setValueContent(e.value);

    },

    [setValueContent],

  );

  return (

    <div className="widget-container">

      <HtmlEditor

        converter={converter}

        height={300}

        defaultValue={valueContent}

        onValueChanged={valueChanged}

      >

        <Toolbar>

          <Item name="undo" />

          <Item name="redo" />

          <Item name="separator" />

          <Item name="bold" />

          <Item name="italic" />

          <Item name="separator" />

          <Item

            name="header"

            acceptedValues={headerValues}

            options={headerOptions}

          />

          <Item name="separator" />

          <Item name="orderedList" />

          <Item name="bulletList" />

        </Toolbar>

      </HtmlEditor>

​

      <div className="options">

        <div className="value-title">Markdown Preview</div>

        <div

          className="value-content"

          tabIndex={0}

        >

          {valueContent}

        </div>

      </div>

    </div>

  );

}

​

import React from 'react';

import ReactDOM from 'react-dom';

​

import App from './App.tsx';

​

ReactDOM.render(

  <App />,

  document.getElementById('app'),

);

​

export const markup = `## ![HtmlEditor](images/widgets/HtmlEditor.svg) Formatted Text Editor (HTML Editor)

​

Lists:

​

1. Use numbers followed by a period for an ordered list.

1. Use a single asterisk for a bullet list.

​

Formats:

​

* Enclose a word in single asterisks for *italic*.

* Enclose a word in double asterisks for **bold**.

`;

​

window.exports = window.exports || {};

window.config = {

  transpiler: 'ts',

  typescriptOptions: {

    module: 'system',

    emitDecoratorMetadata: true,

    experimentalDecorators: true,

    jsx: 'react',

  },

  meta: {

    'react': {

      'esModule': true,

    },

    'typescript': {

      'exports': 'ts',

    },

    'devextreme/time_zone_utils.js': {

      'esModule': true,

    },

    'devextreme/localization.js': {

      'esModule': true,

    },

    'devextreme/viz/palette.js': {

      'esModule': true,

    },

    'openai': {

      'esModule': true,

    },

  },

  paths: {

    'npm:': 'https://unpkg.com/',

    'bundles:': 'bundles/',

    'externals:': 'bundles/externals/',

  },

  defaultExtension: 'js',

  map: {

    'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',

    'typescript': 'npm:typescript@4.2.4/lib/typescript.js',

    'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',

    'react': 'npm:react@17.0.2/umd/react.development.js',

    'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',

    'prop-types': 'npm:prop-types/prop-types.js',

    'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',

    'luxon': 'npm:luxon@3.4.4/build/global/luxon.min.js',

    'es6-object-assign': 'npm:es6-object-assign',

    'devextreme': 'npm:devextreme@24.2.6/cjs',

    'devextreme-react': 'npm:devextreme-react@24.2.6/cjs',

    'unified': 'externals:unified/unified.bundle.js',

    'remark-parse': 'externals:unified/remark-parse.bundle.js',

    'remark-rehype': 'externals:unified/remark-rehype.bundle.js',

    'remark-stringify': 'externals:unified/remark-stringify.bundle.js',

    'rehype-parse': 'externals:unified/rehype-parse.bundle.js',

    'rehype-remark': 'externals:unified/rehype-remark.bundle.js',

    'rehype-stringify': 'externals:unified/rehype-stringify.bundle.js',

    'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',

    'devexpress-diagram': 'npm:devexpress-diagram@2.2.15/dist/dx-diagram.js',

    'devexpress-gantt': 'npm:devexpress-gantt@4.1.60/dist/dx-gantt.js',

    '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12',

    'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',

    'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',

    'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',

    'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',

    'inferno-hydrate': 'npm:inferno-hydrate/dist/inferno-hydrate.min.js',

    'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',

    'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',

    'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',

    'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3',

    // SystemJS plugins

    'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',

    'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',

    // Prettier

    'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',

    'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',

  },

  packages: {

    'devextreme': {

      defaultExtension: 'js',

    },

    'devextreme-react': {

      main: 'index.js',

    },

    'devextreme/events/utils': {

      main: 'index',

    },

    'devextreme/common/core/events/utils': {

      main: 'index',

    },

    'devextreme/localization/messages': {

      format: 'json',

      defaultExtension: 'json',

    },

    'devextreme/events': {

      main: 'index',

    },

    'es6-object-assign': {

      main: './index.js',

      defaultExtension: 'js',

    },

  },

  packageConfigPaths: [

    'npm:@devextreme/*/package.json',

    'npm:@devextreme/runtime@3.0.12/inferno/package.json',

  ],

  babelOptions: {

    sourceMaps: false,

    stage0: true,

    react: true,

  },

};

System.config(window.config);

​

import React from 'react';

import ReactDOM from 'react-dom';

import App from './App.js';

​

ReactDOM.render(<App />, document.getElementById('app'));

​

export const markup = `## ![HtmlEditor](images/widgets/HtmlEditor.svg) Formatted Text Editor (HTML Editor)

​

Lists:

​

1. Use numbers followed by a period for an ordered list.

1. Use a single asterisk for a bullet list.

​

Formats:

​

* Enclose a word in single asterisks for *italic*.

* Enclose a word in double asterisks for **bold**.

`;

​

<!DOCTYPE html>

<html lang="en">

  <head>↔</head>

​

  <body class="dx-viewport">

    <div class="demo-container">

      <div id="app"></div>

    </div>

  </body>

</html>

​

.dx-htmleditor-content img {

  vertical-align: middle;

  padding-right: 10px;

  margin-bottom: 22px;

}

​

.value-title {

  font-size: var(--dx-font-size-sm);

  font-weight: 500;

}

​

.value-content {

  margin-top: 20px;

  overflow: auto;

  height: 210px;

  white-space: pre-wrap;

  border: 1px solid var(--dx-color-border);

  padding: 16px;

  background-color: var(--dx-color-main-bg);

}

​

.options {

  margin-top: 20px;

  padding: 20px;

  background-color: rgba(191, 191, 191, 0.15);

  box-sizing: border-box;

  width: 100%;

}

​