zentao/module/project/js/index.js

/* Make cards clickable. */
$('#cards').on('click', '.panel', function(e)
{
    if(!$(e.target).closest('.kanban-actions').length)
    {
        $.apps.open($(this).data('url'));
    }
});

/* Display drop-down menu.*/
$('.panel').mouseenter(function(e)
{
    $('.kanban-actions' + e.currentTarget.parentElement.dataset.id).css('visibility','visible');
});

/* Hide drop-down menu. */
$('.panel').mouseleave(function(e)
{
    $('.kanban-actions').css('visibility','hidden');
    $('.dropdown').removeClass('open');
});