Tổng hợp một số đoạn code jQuery hữu ích

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Hide element when clicked outside jquery

$(document).mouseup(function(e) {
    var container = $("YOUR CONTAINER SELECTOR");

    // if the target of the click isn't the container nor a descendant of the container
    if (!container.is(e.target) && container.has(e.target).length === 0) {
        container.hide();
    }
});

Detect Scroll Position (Up/Down) using jQuery

var lastScrollTop = 0;
$(window).scroll(function(event){
    var st = $(this).scrollTop();
    if (st > lastScrollTop){
        // downscroll code
    } else {
        // upscroll code
    }
    lastScrollTop = st;
});

Stick div at top when srolling

http://jsfiddle.net/0mLzseby/473/