How to Encode HTML Entities in JavaScript: A Practical Guide

Encoding HTML Entities in JavaScript

Introduction

When displaying user-generated content, it's crucial to handle special characters like ® and &, which may not render correctly in all browsers. To address this, it's necessary to convert these symbols into HTML entities for consistent display.

JavaScript Solution

A straightforward JavaScript approach to encoding HTML entities is to use regular expressions to match the desired symbols and replace them:

<code class="javascript">const encodedStr = rawStr.replace(/[\u00A0-\u9999<>\&amp;]/g, function(i) {
   return '&amp;#'+i.charCodeAt(0)+';';
});</code>

This code iterates over the given character range (unicode 00A0 - 9999, plus ampersand, greater & less than). For each match, it returns the HTML entity equivalent (&#nnn;), where nnn is the unicode character code.

Sup Tag Wrapping

If you require the HTML entity to be wrapped in a ^{tag for styling purposes:}

<code class="javascript">// First encode the HTML entity as described above.

const encodedStr = rawStr.replace(/[\u00A0-\u9999<>\&amp;]/g, function(i) {
   return '&amp;#'+i.charCodeAt(0)+';';
});

// Then, wrap the encoded entity in a `<sup>` tag:

const supEncodedStr = encodedStr.replace(/\&amp\;#/g, '<sup>&amp;#');</code>

Additional Considerations

• Ensure your website uses UTF8 character encoding to support these special characters.
• Test the conversion in different browsers to account for font and configuration variations.

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