[css]代码库
html代码:
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>CSS Form Interactions</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<section>
<h1>CSS表单交互</h1>
<form id="basic-form">
<div class="form-group">
<input type="text" id="basic-form-first-name" placeholder="名称"/>
<label for="basic-form-first-name">名称</label>
</div>
<div class="form-group">
<input type="text" id="basic-form-last-name" placeholder="手机号码"/>
<label for="basic-form-last-name">手机号码</label>
</div>
<div class="form-group">
<input type="email" id="basic-form-email" placeholder="邮箱"/>
<label for="basic-form-email">邮箱<span class="error">输入一个有效的电子邮件地址</span></label>
</div>
<button id="basic-form-submit" type="submit">发送信息</button>
</form>
</section>
</body>
</html>
style.css里的css样式:
@import url("https://fonts.googleapis.com/css?family=Lato:400,700");
:root {
--base-vertical-rhythm: 1.5rem;
--base-transition: 600ms cubic-bezier(0.22, 1, 0.19, 1);
--button-bg-color: mediumseagreen;
--button-border-radius: 0.15rem;
--button-focus-bg-color: seagreen;
--button-font-size: 1rem;
--button-text-color: white;
--form-font-family: 'Lato', sans-serif;
--input-bg-color: white;
--input-border-color: #eaeaea;
--input-border-focus-color: #d8d8d8;
--input-border-radius: 0.15rem;
--input-error-color: red;
--input-padding: 0.75rem;
--input-placeholder-color: gray;
--input-text-color: black;
--input-underline-color: dodgerblue;
}
* {
box-sizing: border-box;
}
body {
display: flex;
flex-direction: column;
justify-content: center;
text-align: left;
font-family: 'Lato', sans-serif;
min-height: 100vh;
padding: 1rem;
background-color: #fafafa;
}
h1 {
font-size: 1.25rem;
font-weight: 700;
line-height: 1.2;
}
p {
font-size: 0.85rem;
line-height: 1.4;
}
section {
margin: 0 auto;
width: 100%;
max-width: 500px;
}
section > * + * {
margin-top: var(--base-vertical-rhythm);
}
.form-group {
position: relative;
display: flex;
flex-direction: column-reverse;
width: 100%;
border-radius: var(--input-border-radius);
}
.form-group + * {
margin-top: var(--base-vertical-rhythm);
}
label {
position: absolute;
top: var(--input-padding);
left: calc(var(--input-padding) + 1px);
margin-bottom: calc(var(--input-padding) * -1.5);
font-size: 0.5rem;
letter-spacing: 0.0025rem;
text-transform: uppercase;
z-index: 1;
pointer-events: none;
opacity: 0;
-webkit-transform: translateY(calc(var(--input-padding) / 4));
transform: translateY(calc(var(--input-padding) / 4));
transition: opacity var(--base-transition), -webkit-transform var(--base-transition);
transition: opacity var(--base-transition), transform var(--base-transition);
transition: opacity var(--base-transition), transform var(--base-transition), -webkit-transform var(--base-transition);
}
.form-group:focus-within label {
opacity: 1;
-webkit-transform: translateY(0);
transform: translateY(0);
}
label .error {
color: var(--input-error-color);
opacity: 0;
transition: opacity var(--base-transition);
}
label .error:before {
content: ' - ';
}
input[type="text"],
input[type="email"] {
-webkit-appearance: none;
padding: calc(var(--input-padding) * 1.5) var(--input-padding);
font-family: var(--form-font-family);
font-size: 1rem;
width: 100%;
color: var(--input-text-color);
background-color: var(--input-bg-color);
outline: none;
border: 1px solid var(--input-border-color);
border-radius: var(--input-border-radius);
box-shadow: rgba(0, 0, 0, 0.05) 0 0.5rem 1rem -0.25rem;
transition: border-color var(--base-transition), box-shadow var(--base-transition), transition var(--base-transition);
}
input[type="text"]::-webkit-input-placeholder,
input[type="email"]::-webkit-input-placeholder {
color: var(--input-placeholder-color);
transition: color var(--base-transition), -webkit-transform var(--base-transition);
transition: color var(--base-transition), transform var(--base-transition);
transition: color var(--base-transition), transform var(--base-transition), -webkit-transform var(--base-transition);
transition-delay: 200ms;
}
input[type="text"]:-ms-input-placeholder,
input[type="email"]:-ms-input-placeholder {
color: var(--input-placeholder-color);
transition: color var(--base-transition), -webkit-transform var(--base-transition);
transition: color var(--base-transition), transform var(--base-transition);
transition: color var(--base-transition), transform var(--base-transition), -webkit-transform var(--base-transition);
transition-delay: 200ms;
}
input[type="text"]::-ms-input-placeholder,
input[type="email"]::-ms-input-placeholder {
color: var(--input-placeholder-color);
transition: color var(--base-transition), -webkit-transform var(--base-transition);
transition: color var(--base-transition), transform var(--base-transition);
transition: color var(--base-transition), transform var(--base-transition), -webkit-transform var(--base-transition);
transition-delay: 200ms;
}
input[type="text"]::placeholder,
input[type="email"]::placeholder {
color: var(--input-placeholder-color);
transition: color var(--base-transition), -webkit-transform var(--base-transition);
transition: color var(--base-transition), transform var(--base-transition);
transition: color var(--base-transition), transform var(--base-transition), -webkit-transform var(--base-transition);
transition-delay: 200ms;
}
input[type="text"]:focus,
input[type="email"]:focus {
border-color: var(--input-border-focus-color);
box-shadow: none;
}
input[type="text"]:focus::-webkit-input-placeholder,
input[type="email"]:focus::-webkit-input-placeholder {
color: transparent;
-webkit-transform: translateX(calc(var(--input-padding) / 2));
transform: translateX(calc(var(--input-padding) / 2));
transition-duration: 0ms;
transition-delay: 0ms;
}
input[type="text"]:focus:-ms-input-placeholder,
input[type="email"]:focus:-ms-input-placeholder {
color: transparent;
transform: translateX(calc(var(--input-padding) / 2));
transition-duration: 0ms;
transition-delay: 0ms;
}
input[type="text"]:focus::-ms-input-placeholder,
input[type="email"]:focus::-ms-input-placeholder {
color: transparent;
transform: translateX(calc(var(--input-padding) / 2));
transition-duration: 0ms;
transition-delay: 0ms;
}
input[type="text"]:focus::placeholder,
input[type="email"]:focus::placeholder {
color: transparent;
-webkit-transform: translateX(calc(var(--input-padding) / 2));
transform: translateX(calc(var(--input-padding) / 2));
transition-duration: 0ms;
transition-delay: 0ms;
}
input[type="text"]:focus, input[type="text"]:not(:placeholder-shown),
input[type="email"]:focus,
input[type="email"]:not(:placeholder-shown) {
padding: calc(var(--input-padding) * 2) var(--input-padding) var(--input-padding);
}
input[type="text"]:not(:placeholder-shown):invalid:not(:focus),
input[type="email"]:not(:placeholder-shown):invalid:not(:focus) {
color: var(--input-error-color);
border-color: var(--input-error-color);
}
input[type="text"]:not(:placeholder-shown):invalid:not(:focus) + label .error,
input[type="email"]:not(:placeholder-shown):invalid:not(:focus) + label .error {
opacity: 1;
}
input[type="text"]:not(:placeholder-shown) + label,
input[type="email"]:not(:placeholder-shown) + label {
opacity: 1;
-webkit-transform: translateY(0);
transform: translateY(0);
}
input[type="text"]:-webkit-autofill + label,
input[type="email"]:-webkit-autofill + label {
opacity: 1;
}
button {
padding: calc(var(--input-padding) * 1.5) calc(var(--input-padding) * 3);
width: 100%;
font-family: var(--form-font-family);
font-size: var(--button-font-size);
color: var(--button-text-color);
background-color: var(--button-bg-color);
border: none;
border-radius: var(--button-border-radius);
box-shadow: rgba(0, 0, 0, 0.05) 0 0.5rem 1rem -0.25rem;
transition: background-color var(--base-transition), box-shadow var(--base-transition), transition var(--base-transition);
}
button:hover, button:focus {
cursor: pointer;
outline: none;
background-color: var(--button-focus-bg-color);
box-shadow: none;
-webkit-transform: translateY(1px);
transform: translateY(1px);
}
button:active {
-webkit-transform: translateY(2px);
transform: translateY(2px);
}
@media (min-width: 400px) {
button {
width: auto;
}
}
转自:http://www.yuncode.net/js/3982.html
[代码运行效果截图]
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