How to Encode HTML Entities in JavaScript to Ensure Correct Display in All Browsers?

How to Encode HTML Entities in JavaScript

Problem:
When using a CMS that allows user-entered text, certain symbols may not display correctly in all browsers. To address this, you want to convert specific symbols to their corresponding HTML entities and wrap them in sup tags for styling.

Solution:
To encode HTML entities in JavaScript, you can use the following code:

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

Implementation:

1. Use Regular Expressions:

   • The code uses regular expressions to replace characters in the Unicode range u00A0-u9999 with HTML entities.
   • It also replaces ampersand, greater than, and less than symbols with &, >, and <, respectively.

2. Convert to HTML Entities:

   • The charCodeAt(0) method returns the Unicode value of a character, which is used to generate the HTML entity in the format &#nnn;.

3. Wrap in sup Tags:

   • After encoding, you can wrap the HTML entities in sup tags for styling.

Note:

• To ensure correct display, configure UTF8 character encoding and ensure your database is storing strings in UTF8.
• Display issues can still arise due to system font configuration and other external factors.

Additional Information:

• [String.charCodeAt documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt)
• [HTML Character Entities](http://www.chucke.com/entities.html)

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