Is There a JavaScript Equivalent to PHP\'s `htmlspecialchars()`?

JavaScript Equivalent to PHP's htmlspecialchars

Determining if there is a JavaScript function equivalent to PHP's htmlspecialchars can be a challenge. However, an alternative approach is to define a custom function for this purpose.

Custom Function for HTML Character Escaping

While JavaScript does not provide a built-in function specifically for HTML character escaping, the following custom function can fulfill this need:

function escapeHtml(text) {
  return text
      .replace(/&/g, "&")
      .replace(/</g, "&amp;lt;")
      .replace(/>/g, "&amp;gt;")
      .replace(/&quot;/g, "&amp;quot;")
      .replace(/'/g, "&amp;#039;");
}

This function accepts a string as input and replaces the following special characters with their HTML character entity equivalents:

• & → &
• < → <

• → >

• " → "
• ' → '

Performance Optimization

For improved performance, particularly with large text blocks, the following modified version of the function can be utilized:

function escapeHtml(text) {
  var map = {
    '&': '&',
    '<': '&amp;lt;',
    '>': '&amp;gt;',
    '&quot;': '&amp;quot;',
    "'"': '&amp;#039;'
  };
  
  return text.replace(/[&amp;<>&quot;']/g, function(m) { return map[m]; });
}

This version creates a hashtable (map) to map special characters to their corresponding entities, then uses the replace() method to perform the replacements.

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