phpjs/functions/strings/htmlentities.js

php.js offers community built php functions in javascript

function htmlentities(string, quote_style, charset, double_encode) {
  //  discuss at: http://phpjs.org/functions/htmlentities/
  // original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  //  revised by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  //  revised by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // improved by: nobbler
  // improved by: Jack
  // improved by: Rafał Kukawski (http://blog.kukawski.pl)
  // improved by: Dj (http://phpjs.org/functions/htmlentities:425#comment_134018)
  // bugfixed by: Onno Marsman
  // bugfixed by: Brett Zamir (http://brett-zamir.me)
  //    input by: Ratheous
  //  depends on: get_html_translation_table
  //   example 1: htmlentities('Kevin & van Zonneveld');
  //   returns 1: 'Kevin & van Zonneveld'
  //   example 2: htmlentities("foo'bar","ENT_QUOTES");
  //   returns 2: 'foo'bar'

  var hash_map = this.get_html_translation_table('HTML_ENTITIES', quote_style),
    symbol = '';
  string = string == null ? '' : string + '';

  if (!hash_map) {
    return false;
  }

  if (quote_style && quote_style === 'ENT_QUOTES') {
    hash_map["'"] = ''';
  }

  if ( !! double_encode || double_encode == null) {
    for (symbol in hash_map) {
      if (hash_map.hasOwnProperty(symbol)) {
        string = string.split(symbol)
          .join(hash_map[symbol]);
      }
    }
  } else {
    string = string.replace(/([\s\S]*?)(&(?:#\d+|#x[\da-f]+|[a-zA-Z][\da-z]*);|$)/g, function(ignore, text, entity) {
      for (symbol in hash_map) {
        if (hash_map.hasOwnProperty(symbol)) {
          text = text.split(symbol)
            .join(hash_map[symbol]);
        }
      }

      return text + entity;
    });
  }

  return string;
}