td colspan does not work while using jquery show/hide()

Answer 1

The problem is that you are toggling the TR, not the TD within it

$(this).parent().parent().next()
   1      2         3       4

• 1 is the A

• 2 is the TD the 1 is in

• 3 is the TR that 2 is in

• 4 is the TR below 3

But your display:none is on the TD within that.

So I would recommend:

$("td",$(this).parent().parent().next()).toggle('slow');

where the inner $ will get you the containing TR, and then you use that as context for the "td" selection.