jquery - 滑入式导航叠加

我有一个off-screen nav的模板，单击toggle时该模板从左侧滑入。我想发生的是nav滑入时，覆盖层会使后面的内容变暗。为此，我将页面内容包装在div中，并尝试添加BG颜色来覆盖该内容，但似乎不起作用。

有人可以帮忙吗？下面的代码：

$(document).ready(function() {
	var toggle = $('.toggle');
	var osNav = $('.offScreen-nav');
	var pageContainer = $('.page-container');

	toggle.click(function() {
		osNav.toggleClass('showNav');
		pageContainer.toggleClass('navOnScreen')
	});
})

* {
	margin: 0;
	padding: 0;
	overflow: hidden;
}

nav {
	width: 100%;
	height: 70px;
	//border: 1px solid;
	background-color: #f1f1f1;
	display: flex;
	flex-direction: row;
	justify-content: flex-end;
}

.toggle {
	height: 50px;
	width: 50px;
	border: 1px solid;
	background-color: rgba(17,17,17, .9);
	opacity: .9;
	margin: 20px 15px;
	cursor: pointer;
	align-self: center;
}

main {
	height: 1000px;
	background-color: #ddd;
}

.offScreen-nav {
	width: 340px;
	height: 100vh;
	position: fixed;
	margin-left: 0;
	overflow: hidden;
	z-index: 2000;
	background-color: rgba(17,17,17, .9);
	transition: all .3s ease-in-out;
	transform: translate3d(-340px,0,0);
}

.showNav {
	transform: translate3d(0,0,0);
}

.page-container {
	transform: translate3d(0,0,0);
	transition: all .3s ease-in-out;
	transition-delay: .1s;
}

.page-container.navOnScreen {
	background-color: rgba(0,0,0, .6);
	transform: translate3d(20px,0,0);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="offScreen-nav"></div>

<div class="page-container">
	<nav>
	<div class="toggle"></div>
</nav>
	<main></main>
</div>

最佳答案

我通常要做的是添加另一个称为overlay的元素，并在切换导航项以产生效果时切换它。我还会将切换按钮从导航栏中移出，以便为它提供一个绝对位置，因为启用叠加层时需要应用z-index使其保持可见。见下文...希望对您有所帮助！

$(document).ready(function() {
	var toggle = $('.toggle');
	var osNav = $('.offScreen-nav');
	var overlay = $('.overlay');
	var pageContainer = $('.page-container');

	toggle.click(function() {
		osNav.toggleClass('showNav');
		overlay.toggleClass('showNav');
		pageContainer.toggleClass('navOnScreen')
	});
})

* {
	margin: 0;
	padding: 0;
	overflow: hidden;
}

nav {
	width: 100%;
	height: 70px;
	//border: 1px solid;
	background-color: #f1f1f1;
	display: flex;
	flex-direction: row;
	justify-content: flex-end;
}

.toggle {
    height: 50px;
    width: 50px;
    border: 1px solid;
    background-color: rgba(17,17,17, .9);
    opacity: .9;
    /* margin: 20px 15px; */
    cursor: pointer;
    align-self: center;
    position: absolute;
    top: 10px;
    right: 15px;
    z-index: 2;
}

main {
	height: 1000px;
	background-color: #ddd;
}

.offScreen-nav {
	width: 340px;
	height: 100vh;
	position: fixed;
	margin-left: 0;
	overflow: hidden;
	z-index: 2000;
	background-color: rgba(17,17,17, .9);
	transition: all .3s ease-in-out;
	transform: translate3d(-340px,0,0);
}

.showNav {
	transform: translate3d(0,0,0);
}

.page-container {
	transform: translate3d(0,0,0);
	transition: all .3s ease-in-out;
	transition-delay: .1s;
}

.page-container.navOnScreen {
	background-color: rgba(0,0,0, .6);
	transform: translate3d(20px,0,0);
}
.overlay.showNav {
    width: 100vw;
    height: 100vh;
    background: blue;
    position: fixed;
    z-index: 1;
}
.overlay{
	transition:0.3s ease;
  opacity: 0.5;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="offScreen-nav"></div>
<div class="overlay"></div>
<div class="toggle"></div>

<div class="page-container">
	<nav>
</nav>
	<main></main>
</div>