Question

我对sidenav叠加层的高度有这个问题，我知道它与粘性导航栏的javascript混淆了，但是我不知道如何使sidenav的高度达到其100％。任何帮助将不胜感激！

代码如下：

<html>     
<head>

<meta name="viewport" content="width=device-width, initial-scale=1">

<style>
 body {
   margin: 0;
   font-size: 28px;
   font-family: Arial, Helvetica, sans-serif;
 }


.header {
   background-color: #f1f1f1;
   padding: 30px;
   text-align: center;
}

#navbar {
  overflow: hidden;
  background-color: #333;
}

#navbar a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 9px 16px;
  text-decoration: none;
  font-size: 17px;
}

#navbar a:hover {
  background-color: #ddd;
  color: black;
}

#navbar a.active {
  background-color: #4CAF50;
  color: white;
}

.content {
  padding: 16px;
}

.sticky {
  position: fixed;
  top: 0;
  width: 100%;
}

.sticky + .content {
  padding-top: 60px;
}
</style>
</head>
<body>

<div class="header">
  <h2>Scroll Down</h2>
  <p>Scroll down to see the sticky effect.</p>
</div>

<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
  <div class="w3-sidebar w3-bar-block w3-animate-left" style="display:none;z-index:999;height:100%" id="mySidebar">
  <button class="w3-bar-item w3-button w3-large" onclick="w3_close()"> Close &times;</button>
  <a class="w3-bar-item w3-button" href="#">Link 1</a>
  <a class="w3-bar-item w3-button" href="#">Link 2</a>
  <a class="w3-bar-item w3-button" href="#">Link 3</a>
</div>
<div class="w3-overlay w3-animate-opacity" onclick="w3_close()" style="cursor:pointer" id="myOverlay"></div>
<script>
function w3_open() {
  document.getElementById("mySidebar").style.display = "block";
  document.getElementById("myOverlay").style.display = "block";
}

function w3_close() {
  document.getElementById("mySidebar").style.display = "none";
  document.getElementById("myOverlay").style.display = "none";
}
</script>
<div id="navbar">
<span class="w3-button w3-white w3-xlarge" onclick="w3_open()">&#9776;</span>

</div>

<div class="content">
  <h3>Sticky Navigation Example</h3>
  <p>The navbar will stick to the top when you reach its scroll position.</p>

  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>

</div>

<script>
window.onscroll = function() {myFunction()};

var navbar = document.getElementById("navbar");
var sticky = navbar.offsetTop;

function myFunction() {
  if (window.pageYOffset >= sticky) {
    navbar.classList.add("sticky")
  } else {
    navbar.classList.remove("sticky");
  }
}
</script>

</body>
</html>

我只需要将sidenav以其100％的高度显示，即使它位于粘性导航栏中也是如此。预先感谢！

Answer 1

为标题设置position: relative。
为边栏设置position: absolute; top: 0。这个对我有用。希望对您也有帮助。

粘滞导航栏顶部的sidenav覆盖，sidenav覆盖的高度问题

1 个答案: