How to make a navigation which disappears while scrolling down but shows up by scrolling up? [closed]

Answer 1

you mean like g+ does it ?

you can use this plugin here ( https://github.com/brandonaaron/jquery-mousewheel ) to detect the mousewheel event and take action based on that

$('#my_elem').mousewheel(function(event, delta, deltaX, deltaY) {
    console.log(delta, deltaX, deltaY);
});

there is also a test page here