sorter

Enable custom column sort.

Example

}, {
  index: 'age',
  width: 60,
  title: 'Age',
  sorter: function(dir, a, b) {
	switch (dir) {
	  case 'asc':
		if (a === '') {
		  return -1;
		}
		return a - b;
	  case 'desc':
		if (b === '') {
		  return -1;
		}
		return b - a;
	}
	return;
  },
  type: 'number'
}, {

Default

undefined