phpjs/functions/strings/html_entity_decode.js

php.js offers community built php functions in javascript

function html_entity_decode(string, quote_style) {
  //  discuss at: http://phpjs.org/functions/html_entity_decode/
  // original by: john (http://www.jd-tech.net)
  //    input by: ger
  //    input by: Ratheous
  //    input by: Nick Kolosov (http://sammy.ru)
  // improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // improved by: marc andreu
  //  revised by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  //  revised by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Onno Marsman
  // bugfixed by: Brett Zamir (http://brett-zamir.me)
  // bugfixed by: Fox
  //  depends on: get_html_translation_table
  //   example 1: html_entity_decode('Kevin & van Zonneveld');
  //   returns 1: 'Kevin & van Zonneveld'
  //   example 2: html_entity_decode('<');
  //   returns 2: '<'

  var hash_map = {},
    symbol = '',
    tmp_str = '',
    entity = '';
  tmp_str = string.toString();

  if (false === (hash_map = this.get_html_translation_table('HTML_ENTITIES', quote_style))) {
    return false;
  }

  // fix & problem
  // http://phpjs.org/functions/get_html_translation_table:416#comment_97660
  delete(hash_map['&']);
  hash_map['&'] = '&';

  for (symbol in hash_map) {
    entity = hash_map[symbol];
    tmp_str = tmp_str.split(entity)
      .join(symbol);
  }
  tmp_str = tmp_str.split(''')
    .join("'");

  return tmp_str;
}