select下拉折叠动画效果-html代码-BFW代码库

代码语言：html
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">

<link rel='stylesheet' href='https://fonts.googleapis.com/css?family=Gaegu:400,700&amp;display=swap'>
<style>
* {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root {
	--foldDur: 0.7s;
	font-size: calc(24px + (30 - 24)*(100vw - 320px)/(1280 - 320));
}
body, button {
	color: #171717;
	font: 1em Gaegu, cursive;
	line-height: 1.5;
}
body {
	background-image:
		linear-gradient(#8ccfd100 1.35em,#8ccfd1 1.4em 1.45em,#8ccfd100 1.5em),
		linear-gradient(90deg,#e5e5e5 1.35em,#8ccfd1 1.4em 1.45em,#e5e5e5 1.5em);
	background-position: 50% 0;
	background-size: 1.5em 1.5em;
}
form, .select__button, .select__options {
	width: 100%;
}
form {
	margin: auto;
	padding: 3em 1.5em 6em 1.5em;
	max-width: 13.25em;
}
label {
	display: block;
	font-weight: bold;
}
.select, .select__button {
	position: relative;
}
.select {
	margin-bottom: 1.5em;
	perspective: 20em;
}
.select select {
	display: none;
}
.select__button, .select__option {
	background: #f1f1f1;
	cursor: pointer;
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 0 0.375em;
}
.select__button {
	animation-duration: var(--foldDur);
	animation-timing-function: ease-in-out;
	animation-direction: reverse;
	border-radius: 0;
	box-shadow:
		-0.05em 0 0 #fff inset,
		0.05em 0 0 #ccc inset,
		0 -0.05em 0 #d9d9d9 inset;
	transform-origin: 50% 100%;
	-webkit-appearance: none;
	appearance: none;
	z-index: 1;
}
.select__button:focus, .select__option:focus {
	outline: transparent;
}
.select__button:focus {
	color: #2762f3;
}
.select__button:after, .select__option:first-child:after {
	border-left: 0.25em solid transparent;
	border-right: 0.25em solid transparent;
	content: "";
	display: block;
	width: 0;
	height: 0;
}
.select__button:after {
	border-top: 0.25em solid;
}
.select__button--pristine {
	animation: none;
}
.select__options {
	position: absolute;
	top: 0;
	left: 0;
	visibility: hidden;
	transition: visibility 0s var(--foldDur) steps(1);
}
.select__option {
	box-shadow:
		-0.05em -0.1em 0.2em 0 #0001 inset,
		0.05em 0 0 #ccc inset,
		-0.05em 0.1em 0.2em 0 #fff inset,
		-0.05em 0 0 #fff inset;
	color: inherit;
	opacity: 0;
	text-decoration: none;
	transition: opacity 0s var(--foldDur) steps(1);
}
.select__option:first-child {
	box-shadow:
		-0.05em -0.1em 0.2em 0 #0001 inset,
		0.05em 0 0 #ccc inset,
		-0.05em 0 0 #fff inset;
}
.select__option:first-child:after {
	border-bottom: 0.25em solid;
}
.select__option:hover, .select__option:focus {
	background: #b8ccf9;
	box-shadow:
		-0.05em -0.1em 0.2em 0 #0001 inset,
		0.05em 0 0 #a9bbe5 inset,
		-0.05em 0 0 #c1d4ff inset;
}
.select__option[aria-selected="true"]:not(:first-child):after {
	content: "\2713";
}

/* Animation */
.select__button[aria-expanded="true"] {
	animation-direction: normal;
	animation-fill-mode: forwards;
	box-shadow:
		-0.05em -0.1em 0.2em 0 #fff inset,
		-0.05em 0 0 #fff inset;
	cursor: default;
	pointer-events: none;
}
.select__button--fold4 {
	animation-name: fold4;
}
.select__button--fold5 {
	animation-name: fold5;
}
.select__button[aria-expanded="true"] + .select__options,
.select__button[aria-expanded="true"] + .select__options .select__option {
	transition-delay: 0s;
}
.select__button--fold4[aria-expanded="true"] + .select__options,
.select__button--fold5[aria-expanded="true"] + .select__options {
	visibility: visible;
}
.select__button--fold4[aria-expanded="true"] + .select__options .select__option,
.select__button--fold5[aria-expanded="true"] + .select__options .select__option {
	opacity: 1;
}

.select__button--fold4 + .select__options .select__option:nth-child(4),
.select__button--fold4[aria-expanded="true"] + .select__options .select__option:nth-child(2) {
	transition-delay: calc(var(--foldDur) * 0.25);
}
.select__button--fold4 + .select__options .select__option:nth-child(3),
.select__button--fold4[aria-expanded="true"] + .select__options .select__option:nth-child(3) {
	transition-delay: calc(var(--foldDur) * 0.5);
}
.select__button--fold4 + .select__options .select__option:nth-child(2),
.select__button--fold4[aria-expanded="true"] + .select__options .select__option:nth-child(4) {
	transition-delay: calc(var(--foldDur) * 0.75);
}

.select__button--fold5 + .select__options .select__option:nth-child(5),
.select__button--fold5[aria-expanded="true"] + .select__options .select__option:nth-child(2) {
	transition-delay: calc(var(--foldDur) * 0.2);
}
.select__button--fold5 + .select__options .select__option:nth-child(4),
.select__button--fold5[aria-expanded="true"] + .select__options .select__option:nth-child(3) {
	transition-delay: calc(var(--foldDur) * 0.4);
}
.select__button--fold5 + .select__options .select__option:nth-child(3),
.select__button--fold5[aria-expanded="true"] + .select__options .select__option:nth-child(4) {
	transition-delay: calc(var(--foldDur) * 0.6);
}
.select__button--fold5 + .select__options .select__option:nth-child(2),
.select__button--fold5[aria-expanded="true"] + .select__options .select__option:nth-child(5) {
	transition-delay: calc(var(--foldDur) * 0.8);
}

@keyframes appear {
	from { opacity: 0 }
	to { opacity: 1 }
}
@keyframes fold4 {
	from { color: #171717; transform: translateY(0) rotateX(0deg) }
	12.5% { color: #171717; transform: translateY(0) rotateX(-90deg) }
	12.51% { color: transparent; transform: translateY(0) rotateX(-90deg) }
	25% { color: transparent; transform: translateY(0) rotateX(-180deg) }
	25.01% { color: transparent; transform: translateY(100%) rotateX(0deg) }
	50% { color: transparent; transform: translateY(100%) rotateX(-180deg) }
	50.01% { color: transparent; transform: translateY(200%) rotateX(0deg) }
	75% { color: transparent; transform: translateY(200%) rotateX(-180deg) }
	75.01% { color: transparent; transform: translateY(300%) rotateX(0deg) }
	to { color: transparent; transform: translateY(300%) rotateX(-100deg) }
}
@keyframes fold5 {
	from { color: #171717; transform: translateY(0) rotateX(0deg) }
	10% { color: #171717; transform: translateY(0) rotateX(-90deg) }
	10.01% { color: transparent; transform: translateY(0) rotateX(-90deg) }
	20% { color: transparent; transform: translateY(0) rotateX(-180deg) }
	20.01% { color: transparent; transform: translateY(100%) rotateX(0deg) }
	40% { color: transparent; transform: translateY(100%) rotateX(-180deg) }
	40.01% { color: transparent; transform: translateY(200%) rotateX(0deg) }
	60% { color: transparent; transform: translateY(200%) rotateX(-180deg) }
	60.01% { color: transparent; transform: translateY(300%) rotateX(0deg) }
	80% { color: transparent; transform: translateY(300%) rotateX(-180deg) }
	80.01% { color: transparent; transform: translateY(400%) rotateX(0deg) }
	to { color: transparent; transform: translateY(400%) rotateX(-100deg) }
}
</style>

</head>
<body translate="no">
<form>
<label for="os">OS</label>
<select id="os" name="os">
<option value="none" selected>Select…</option>
<option value="linux">Linux<.........完整代码请登录后点击上方下载按钮下载查看
select下拉折叠动画效果

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