necota

<?php
error_reporting(-1);
ini_set('display_errors', 1);
/**
 * Website document root
 */
define('DOCROOT', __DIR__.DIRECTORY_SEPARATOR);
/**
 * Path to the application directory.
 */

necota

jQuery.fn.ifExists = function(fn, else_fn){
  this.length !== 0 ? fn(this) : (else_fn && else_fn());
  return this;
};

// usage
$("section#foo").ifExists(function(foo){
  alert('<section id="foo" /> exists');
});