How to Achieve the Equivalent of PHP\'s htmlspecialchars in JavaScript?

JavaScript Equivalent to PHP's htmlspecialchars

In JavaScript, there is no built-in function directly analogous to PHP's htmlspecialchars for converting HTML special characters to character entities. However, there are custom solutions that can achieve a similar result.

Custom Implementation

One approach is to define a custom function that manually translates each special character. For instance:

function escapeHtml(text) {
  return text
      .replace(/&/g, "&")
      .replace(/, "/g, ">")
      .replace(/"/g, """)
      .replace(/'/g, "'");
}

This function takes a string as input and replaces all occurrences of the following characters with their corresponding character entities:

• & - &

• • >

• " - "
• ' - '

Improved Performance

For better performance, especially with large texts, you can use a slightly optimized version:

function escapeHtml(text) {
  var map = {
    '&': '&',
    '': '>',
    '"': '"',
    "'": '''
  };
  
  return text.replace(/[&"']/g, function(m) { return map[m]; });
}

This version uses a lookup table to store the character entity mappings, which eliminates the need for multiple replace operations.

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