Question

I have example (js-fiddle)
I want hide all tbody elements, that doesn’t contains elements tr elements without class “day_label” and “hide”
In this exmaple i have stats for day, and i need to hide all day if there is no any record for day.

Answer 1

What you want is basically a CSS parent selector (tr.hide < tbody { display: none; }​), this doesn’t exist yet. (soon!) However, this can be done quite easily with a library like jQuery:

$("tbody").each(function() {
    if ($(this).children("tr:not(.hide):not(.day_label)").length) { //Not 0
        $(this).addClass("show");
    }
});​

CSS:

tbody { display: none; }
tbody.show { display: block; }​

Demo: http://jsfiddle.net/SO_AMK/RqBCY/