动画侧面导航菜单：如何避免跳转布局？

Question

问题是在打开和关闭项目时“跳来跳去”（仅在包含多个单词的菜单项上）。我该如何防止这种情况？

这样真的很难看。我希望菜单显示时没有布局跳转。

示例

以下代码来自w3schools。仅供参考。

body {
  font-family: "Lato", sans-serif;
}

.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #111;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidenav a:hover {
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>

<div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <a href="#">About Me</a>
  <a href="#">My Services</a>
  <a href="#">Best Clients</a>
  <a href="#">Contact</a>
</div>

<h2>Animated Sidenav Example</h2>
<p>Click on the element below to open the side navigation menu.</p>
<span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; open</span>

<script>
function openNav() {
  document.getElementById("mySidenav").style.width = "250px";
}

function closeNav() {
  document.getElementById("mySidenav").style.width = "0";
}
</script>
   
</body>
</html>

Answer 1

要做到这一点，不要玩弄宽度，松开它，将框推离页面，然后再拉回来。因此，动画将看起来流畅和专业。

相关CSS 属性:

transform: translateX (...)

您可以在我的代码段中测试更改。我在代码片段中指定了变化点。祝你好运。

body {
  font-family: "Lato", sans-serif;
}

.sidenav {
  height: 100%;
  /* Changed */ width: 250px;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #111;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
  
  /* Added */ transform: translateX(-100%);
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidenav a:hover {
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>

<div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <a href="#">About Me</a>
  <a href="#">My Services</a>
  <a href="#">Best Clients</a>
  <a href="#">Contact</a>
</div>

<h2>Animated Sidenav Example</h2>
<p>Click on the element below to open the side navigation menu.</p>
<span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; open</span>

<script>
function openNav() {
  document.getElementById("mySidenav").style = "transform: translateX(0)"; // Changed
}

function closeNav() {
  document.getElementById("mySidenav").style = ""; // Changed
}
</script>
   
</body>
</html>

动画侧面导航菜单：如何避免跳转布局？

Animated side navigation menu: How to avoid jumping layout?

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