phpjs/functions/url/rawurlencode.js

php.js offers community built php functions in javascript

function rawurlencode(str) {
  // From: http://phpjs.org/functions
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // +      input by: travc
  // +      input by: Brett Zamir (http://brett-zamir.me)
  // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +      input by: Michael Grier
  // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
  // +      input by: Ratheous
  // +      reimplemented by: Brett Zamir (http://brett-zamir.me)
  // +   bugfixed by: Joris
  // +      reimplemented by: Brett Zamir (http://brett-zamir.me)
  // %          note 1: This reflects PHP 5.3/6.0+ behavior
  // %        note 2: Please be aware that this function expects to encode into UTF-8 encoded strings, as found on
  // %        note 2: pages served as UTF-8
  // *     example 1: rawurlencode('Kevin van Zonneveld!');
  // *     returns 1: 'Kevin%20van%20Zonneveld%21'
  // *     example 2: rawurlencode('http://kevin.vanzonneveld.net/');
  // *     returns 2: 'http%3A%2F%2Fkevin.vanzonneveld.net%2F'
  // *     example 3: rawurlencode('http://www.google.nl/search?q=php.js&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a');
  // *     returns 3: 'http%3A%2F%2Fwww.google.nl%2Fsearch%3Fq%3Dphp.js%26ie%3Dutf-8%26oe%3Dutf-8%26aq%3Dt%26rls%3Dcom.ubuntu%3Aen-US%3Aunofficial%26client%3Dfirefox-a'
  str = (str + '').toString();

  // Tilde should be allowed unescaped in future versions of PHP (as reflected below), but if you want to reflect current
  // PHP behavior, you would need to add ".replace(/~/g, '%7E');" to the following.
  return encodeURIComponent(str).replace(/!/g, '%21').replace(/'/g, '%27').replace(/\(/g, '%28').
      replace(/\)/g, '%29').replace(/\*/g, '%2A');
}