phpjs/functions/strings/ucwords.js

php.js offers community built php functions in javascript

function ucwords(str) {
  //  discuss at: http://phpjs.org/functions/ucwords/
  // original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
  // improved by: Waldo Malqui Silva
  // improved by: Robin
  // improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Onno Marsman
  //    input by: James (http://www.james-bell.co.uk/)
  //   example 1: ucwords('kevin van  zonneveld');
  //   returns 1: 'Kevin Van  Zonneveld'
  //   example 2: ucwords('HELLO WORLD');
  //   returns 2: 'HELLO WORLD'

  return (str + '')
    .replace(/^([a-z\u00E0-\u00FC])|\s+([a-z\u00E0-\u00FC])/g, function($1) {
      return $1.toUpperCase();
    });
}