How Can I Safely Escape HTML Strings Using jQuery?

Escaping HTML Strings Seamlessly with jQuery

Escaping HTML characters is crucial for preventing security vulnerabilities such as injection attacks. While jQuery provides a range of manipulation methods, it lacks a native function dedicated to HTML escaping. To address this need, we'll explore a popular and efficient solution from mustache.js, which can be easily implemented in jQuery.

The mustache.js Escape Function

The mustache.js library offers an effective escapeHtml function that transforms arbitrary strings into HTML-safe values. It creates an entity map to replace unsafe characters with their corresponding HTML character references. By chaining this function within jQuery, you can easily neutralize potential threats:

jQuery Extension

jQuery.fn.escapeHtml = function() {
  const entityMap = {
    '&': '&',
    '<': '&amp;lt;',
    '>': '&amp;gt;',
    '"': '&amp;quot;',
    "'": '&amp;#39;',
    '/': '&amp;#x2F;',
    '`': '&amp;#x60;',
    '=': '&amp;#x3D;'
  };

  return this.each(function() {
    $(this).text(String($(this).html()).replace(/[&amp;<>"'`=\/]/g, function (s) {
      return entityMap[s];
    }));
  });
};

Usage Example

$('#myElement').escapeHtml();

This snippet replaces the HTML within #myElement with its escaped equivalent. Characters like <, >, and & will be transformed into harmless HTML entities.

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