javascript - 向下滑动一个div并隐藏它，就好像它不存在一样
问题描述
在 2 秒的时间间隔后，我试图向下滑动这个“.preloader”div，并尝试了 JQUERY，但我不知道为什么它不起作用。另外，我不想有一个切换按钮。我尝试使用@keyframes 创建动画，但是一旦 div 超出页面边界，就会显示一个滚动条，您可以使用它向下滚动并看到实际上 div 放置在 html 页面下方。`
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: "Poppins", sans-serif;
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
perspective: 1000px;
background-image: url('background_image_one.jpg');
background-repeat: no-repeat;
background-attachment: fixed;
background-size: cover;
background-position: center;
}
.container {
width: 50%;
display: flex;
justify-content: center;
align-items: center;
}
.card {
transform-style: preserve-3d;
background-color: rgba(0, 0, 0, 0.5);
border: white;
border-style: solid;
min-height: 60vh;
width: 35rem;
border-radius: 30px;
padding: 0rem 5rem;
box-shadow: 0 20px 20px rgba(0, 0, 0, 0.2), 0px 0px 50px rgba(0, 0, 0, 0.2);
}
.avatar {
min-height: 35vh;
display: flex;
align-items: center;
justify-content: center;
}
.avatarimg {
width: 40rem;
z-index: 2;
transition: all 0.75s ease-out;
}
.info h1 {
font-size: 3rem;
transition: all 0.75s ease-out;
display: flex;
justify-content: center;
color: white;
}
.info h3 {
font-size: 1.3rem;
padding: 2rem 0rem;
color: #585858;
font-weight: lighter;
transition: all 0.75s ease-out;
}
.sizes {
display: flex;
justify-content: space-evenly;
transition: 0.5s ease-out;
padding-bottom: 2rem;
}
.sizes button {
/* padding: 0.5rem 2rem; */
box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.2);
cursor: pointer;
font-weight: bold;
width: 100%;
padding: 1rem 0rem ;
background: #f54642;
border: none;
color: white;
border-radius: 30px;
font-weight: bolder;
margin: 1rem;
}
button.active {
background: #585858;
color: white;
}
.purchase {
margin-top: 5rem;
transition: all 0.75s ease-out;
}
/* тука са моите бутони */
input[type="text"], input[type="password"] {
border: none;
border-bottom: 0px;
background: rgba(255, 255, 255, 0.2);
color: whitesmoke;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
outline: none;
height: 40px;
width: 100%;
font-size: 16px;
transition: all 0.75s ease-out;
}
.forminput p {
font-size: 18px;
color: white;
}
.forminput {
padding-bottom: 3rem;
}
.preloader {
background: #000823 url("bold-preloader.gif") no-repeat center center;
min-height: 100vh;
height: 100vh;
width: 100%;
position: fixed;
z-index: 100;
animation: slide 4s ease-out forwards;
}
@keyframes slide{
0% {}
50%{
transform: translateY(0px);
overflow: hidden;}
100%{
transform: translateY(100vh);
overflow: hidden;
}
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>3d Card Effect</title>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;500&display=swap" rel="stylesheet">
<link rel="stylesheet" href="./style.css">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
</head>
<body>
<div class="preloader">
</div>
<div class="container">
<div class="card">
<div class="avatar">
<div class="circle"></div>
<img src="./userAvatar.png" alt="avatarimg" class="avatarimg">
</div>
<div class="info">
<h1 class="title">Log In</h1>
<div class="forminput">
<p>Email:</p>
<input type="text" name="" placeholder="">
<p>Password:</p>
<input type="password" name="" placeholder="">
</div>
</div>
<div class="sizes">
<button>Login</button>
<button>Register</button>
</div>
</div>
</div>
</div>
<script src="./app.js"></script>
</body>
</html>正如您在代码片段中看到的那样，当 div 向下滑动时，它会在主体的主要部分下方创建空间。
解决方案
而不是平移元素，这意味着它仍然具有高度，因此当它向下消失时您会得到一个滚动条，您可以在 Y 方向上缩放到 0，将 Y 的变换原点更改为页面底部：
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: "Poppins", sans-serif;
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
perspective: 1000px;
background-image: url('background_image_one.jpg');
background-repeat: no-repeat;
background-attachment: fixed;
background-size: cover;
background-position: center;
}
.container {
width: 50%;
display: flex;
justify-content: center;
align-items: center;
}
.card {
transform-style: preserve-3d;
background-color: rgba(0, 0, 0, 0.5);
border: white;
border-style: solid;
min-height: 60vh;
width: 35rem;
border-radius: 30px;
padding: 0rem 5rem;
box-shadow: 0 20px 20px rgba(0, 0, 0, 0.2), 0px 0px 50px rgba(0, 0, 0, 0.2);
}
.avatar {
min-height: 35vh;
display: flex;
align-items: center;
justify-content: center;
}
.avatarimg {
width: 40rem;
z-index: 2;
transition: all 0.75s ease-out;
}
.info h1 {
font-size: 3rem;
transition: all 0.75s ease-out;
display: flex;
justify-content: center;
color: white;
}
.info h3 {
font-size: 1.3rem;
padding: 2rem 0rem;
color: #585858;
font-weight: lighter;
transition: all 0.75s ease-out;
}
.sizes {
display: flex;
justify-content: space-evenly;
transition: 0.5s ease-out;
padding-bottom: 2rem;
}
.sizes button {
/* padding: 0.5rem 2rem; */
box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.2);
cursor: pointer;
font-weight: bold;
width: 100%;
padding: 1rem 0rem ;
background: #f54642;
border: none;
color: white;
border-radius: 30px;
font-weight: bolder;
margin: 1rem;
}
button.active {
background: #585858;
color: white;
}
.purchase {
margin-top: 5rem;
transition: all 0.75s ease-out;
}
/* тука са моите бутони */
input[type="text"], input[type="password"] {
border: none;
border-bottom: 0px;
background: rgba(255, 255, 255, 0.2);
color: whitesmoke;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
outline: none;
height: 40px;
width: 100%;
font-size: 16px;
transition: all 0.75s ease-out;
}
.forminput p {
font-size: 18px;
color: white;
}
.forminput {
padding-bottom: 3rem;
}
.preloader {
background: #000823 url("bold-preloader.gif") no-repeat center center;
min-height: 100vh;
height: 100vh;
width: 100%;
position: fixed;
z-index: 100;
animation: slide 4s ease-out forwards;
}
@keyframes slide{
0% {}
50%{
transform: scaleY(1);
overflow: hidden;
}
100%{
transform: scaleY(0);
transform-origin: 0 100vh;
overflow: hidden;
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>3d Card Effect</title>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;500&display=swap" rel="stylesheet">
<link rel="stylesheet" href="./style.css">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
</head>
<body>
<div class="preloader">
</div>
<div class="container">
<div class="card">
<div class="avatar">
<div class="circle"></div>
<img src="./userAvatar.png" alt="avatarimg" class="avatarimg">
</div>
<div class="info">
<h1 class="title">Log In</h1>
<div class="forminput">
<p>Email:</p>
<input type="text" name="" placeholder="">
<p>Password:</p>
<input type="password" name="" placeholder="">
</div>
</div>
<div class="sizes">
<button>Login</button>
<button>Register</button>
</div>
</div>
</div>
</div>
<script src="./app.js"></script>
</body>
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