// For Bootstrap 4
$("tr:visible").each(function (index) {
    $(this).css("background-color", !!(index & 1)? "rgba(0,0,0,.05)" : "rgba(0,0,0,0)");
});

// For previous versions
$("tr:not(.hidden)").each(function (index) {
    $(this).toggleClass("stripe", !!(index & 1));
});