$('#container').on('click', function(e) {

  var targetId = e.target.getAttribute('id');

  // Manually do event delegation

  if (targetId === 'foo') {

    var currentId = e.currentTarget.getAttribute('id');

    console.log('without delegation, currentTarget is: ' + currentId);

  }

});

​

$('#container').on('click', '#foo', function(e) {

    var currentId = e.currentTarget.getAttribute('id');

    console.log('with delegation, currentTarget is: ' + currentId);

});