JQuery ui droppable aceite o número máximo de elementos
$(function() {
var limit = 5;
var counter = 0;
$('.drag').draggable({revert: "invalid"});
$('.drop').droppable({
drop: function() {
counter++;
if (counter == limit) {
alert('limit reached!');
$(this).droppable("disable");
}
}
});
});
Embarrassed Eagle