jQuery проверьте, скрыт ли элемент
// Checks css for display:[none|block], ignores visibility:[true|false]
$(element).is(":hidden");
Grepper
// Checks css for display:[none|block], ignores visibility:[true|false]
$(element).is(":hidden");
if($('#list-team-single-container').children(':visible').length == 0) {
// action when all are hidden
}