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XHTML validation in JavaScript (ES5) RichTextEditor control

08 May 2023 / 1 minute to read

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.js
index.html
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/**
 * Rich Text Editor toolbar floating sample
 */

var defaultRTE = new ej.richtexteditor.RichTextEditor({
	enableXhtml : true
});
defaultRTE.appendTo('#defaultRTE');
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<!DOCTYPE html><html lang="en"><head>
            
    <title>Essential JS 2 Rich Text Editor</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-richtexteditor/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="defaultRTE">
            <p>The Rich Text Editor is WYSIWYG ("what you see is what you get") editor useful to create and edit content, and return the valid <a href="https://ej2.syncfusion.com/home/" target="_blank">HTML markup</a> or <a href="https://ej2.syncfusion.com/home/" target="_blank">markdown</a> of the content</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>
            </ul>
        </div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
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