Text to HTML char entities.

toCharEntity.js

function toCharEntity(str, useHexa) {
  if (str !== undefined && str !== null) {
    str = '' + str;
    var codeCache;
    var res = '';
    for(var i = 0, l = str.length; i < l ;) {
      res += '&#'; 
      codeCache = str.charCodeAt(i++);
      res += useHexa ? 'x' + codeCache.toString('16') : codeCache;
      res += ';';
    }
    return res;
  }
}