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XHTML validation in React RichTextEditor component

The editor provides an option to validate the source content of the Rich Text Editor against the XHTML standard using the ‘enableXhtml’ property. When you enter or modify content in the editor, it continuously checks the XHTML source content and removes elements and attributes that are not valid.

The editor checks the following settings on validation:

Attributes

  • Must be specified in lowercase.
  • Proper use of quotation marks around the attributes.
  • Must be valid attributes for corresponding HTML element.
  • All the required attributes must be included in the HTML element.

HTML Elements

  • Must be in lowercase.
  • All opening tags must be closed.
  • Allows only the valid HTML elements.
  • Elements must be properly nested.
  • All elements must have one root element.
  • Should not use inline elements inside the block elements.
Source
Preview
index.tsx
index.html
App.css.jsx
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import App  from './App';

ReactDOM.render(<App />, document.getElementById('sample'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title> Syncfusion React Rich Text Editor </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
     <link href="//cdn.syncfusion.com/ej2/ej2-react-richtexteditor/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
    </style>
</head>

<body>
    <div id='sample' style="margin: 20px auto 0;">
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>
/**
 * Rich Text Editor - RTL Sample
 */
import { HtmlEditor, Image, Inject, Link, QuickToolbar, RichTextEditorComponent, Toolbar } from '@syncfusion/ej2-react-richtexteditor';
import * as React from 'react';
import './App.css';
class App extends React.Component {
    render() {
        return (<RichTextEditorComponent height={450} enableXhtml={true}>
        <p>The Rich Text Editor component is WYSIWYG ("what you see is what you get") editor that provides the best user experience to create and update the content.
          Users can format their content using standard toolbar commands.</p>
        <p><b>Key features:</b></p>
        <ul>
          <li>
            <p>Provides &lt;IFRAME&gt; and &lt;DIV&gt; modes</p>
          </li>
          <li>
            <p>Capable of handling markdown editing.</p>
          </li>
          <li>
            <p>Contains a modular library to load the necessary functionality on demand.</p>
          </li>
          <li>
            <p>Provides a fully customizable toolbar.</p>
          </li>
          <li>
            <p>Provides HTML view to edit the source directly for developers.</p>
          </li>
          <li>
            <p>Supports third-party library integration.</p>
          </li>
          <li>
            <p>Allows preview of modified content before saving it.</p>
          </li>
          <li>
            <p>Handles images, hyperlinks, video, hyperlinks, uploads, etc.</p>
          </li>
          <li>
            <p>Contains undo/redo manager.</p>
          </li>
          <li>
            <p>Creates bulleted and numbered lists.</p>
          </li>
        </ul>
        <Inject services={[Toolbar, Image, Link, HtmlEditor, QuickToolbar]}/>
      </RichTextEditorComponent>);
    }
}
export default App;