Question

我试图隐藏.site-header滚动显示，并使其在闲置几秒钟后重新出现。

我在这里找到了最多的答案：How to hide a Div when the scroll bar is moving with jQuery?

    var $header = $(".site-header");
    var opacity = $header.css("opacity");
    var scrollStopped;

    var fadeInCallback = function () {
        if (typeof scrollStopped != 'undefined') {
            clearInterval(scrollStopped);
        }

        scrollStopped = setTimeout(function () {
            $header.animate({ opacity: 1 }, "slow");
        }, 500);
    }

    $(window).scroll(function () {
        if (!$header.is(":animated") && opacity == 1) {
            $header.animate({ opacity: 0 }, "slow", fadeInCallback);
        } else {
            fadeInCallback.call(this);
        }
    });

    $('.menu-toggle').on('click', function(){
        $('.menu-toggle').addClass('activated');
    });

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.6.3/jquery.min.js"></script>
<section style="height:5000px;">
    <div class="site-header" style="position:fixed; top:5px; left:5px; width:200px; height:100px; display:block; background:#000; opacity:1;">
        
        <button class="menu-toggle">Menu</button>

        <nav class="nav-primary">
            <ul>
            <li>Menu item 1</li>
            <li>Menu item 2</li>
            <li>Menu item 3</li>
            </ul>
        </nav>

    </div>

</section>

通过点击nav激活button

但是，nav嵌套在.site-header内，这意味着当菜单被激活时，它仍会在滚动时淡出...

我想知道如何更改此javascript，以便将.activated类应用于button时，即使滚动时nav仍然可见。

这是小提琴https://jsfiddle.net/fwa16eok/

非常感谢！

Answer 1

在淡出动画调用之前添加!$menu.is(":active")

var $menu = $("#menu");
    var opacity = $menu.css("opacity");
    var scrollStopped;

    var fadeInCallback = function () {
        if (typeof scrollStopped != 'undefined') {
            clearInterval(scrollStopped);
        }

        scrollStopped = setTimeout(function () {
            $menu.animate({ opacity: 1 }, "slow");
        }, 2000);
    }

    $(window).scroll(function () {
        if (!$menu.is(":active") &&!$menu.is(":animated") && opacity == 1) {
            $menu.animate({ opacity: 0 }, "slow", fadeInCallback);
        } else {
            fadeInCallback.call(this);
        }
    });

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.6.3/jquery.min.js"></script>
<section style="height:5000px;">
    <div id="menu" style="position:fixed; top:5px; left:5px; width:200px; height:100px; display:block; background:#000; opacity:1;"></div>
</section>

Answer 2

HTML：

<div>
   <div class="a">A</div>
</div>

Javascript：

$(window).scroll(function() {  
   if ($(this).scrollTop() > 0) {
      $('.a').fadeOut();  } 
   else {
      $('.a').fadeIn();
 }
});

在滚动条上隐藏div，但在激活时保持可见

2 个答案: