jquery - how to add/remove class on slideToggle?

Question

I would like to each time the div expands, to add the class 'selecionado' once the expansion is finished. When the contraction is done (the slideUp part) I would like to remove this class.

Can I have a help here please?

$('#btCategoriaA').click(function()
{
  $('#listaCategoriaA').slideToggle('slow', function() {
   $('#btCategoriaA').addClass('selecionado');
  });
});

Thanks in advance, MEM

Solution

You can toggle the class using .toggleClass() based on if the element .is() :visible after the animation, like this:

$('#btCategoriaA').click(function() {
  $('#listaCategoriaA').slideToggle('slow', function() {
    $('#btCategoriaA').toggleClass('selecionado', $(this).is(':visible'));
  });
});