textToSlug.js

function textToSlug(text) {
  var i;
  var reg;
  var from  = 'àáâãäåæçèéêëìíîïðñòóôõöøùúûüýþßàáâãäåæçèéêëìíîïðñòóôõöøùúûýýþÿŕŕ';
  var to    = 'aaaaaaaceeeeiiiidnoooooouuuuybsaaaaaaaceeeeiiiidnoooooouuuyybyrr';

  if (typeof text !== 'string') {
    return new TypeError('The parameter must be string');
  }
  text = text.toLowerCase().trim().replace(/\s+/g, '-').replace(/\-{2,}/g, '-');
  for (i = 0; i < from.length; i += 1) {
    reg = new RegExp(from.charAt(i), 'gim');
    text = text.replace(reg, to.charAt(i));
  }
  return text.replace(/[^\w\-]*/g, '');
}