[ui.sortable] ui.sender

[neojp]

Sometimes ui.sender is not passed on change events.

console.info(ui.sender);

[paul]

sender is only passed when you move the element into a different container.

[neojp]

Indeed, it is supposed to do that. Still there are sometimes when it isn't passed; the ​Layout demo was using it, if you move around a box between different containers you will see that the placeholder is not always been resized.

if(ui.sender){
  var w = ui.element.width();
  ui.placeholder.width(w);
}