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> |
<h 1 >CSS表单交互</h 1 > |
<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: 1.5 rem; |
--base-transition: 600 ms cubic-bezier( 0.22 , 1 , 0.19 , 1 ); |
--button-bg- color : mediumseagreen; |
--button-border-radius: 0.15 rem; |
--button-focus-bg- color : seagreen; |
--button- font-size : 1 rem; |
--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: 0.15 rem; |
--input-error- color : red ; |
--input- padding : 0.75 rem; |
--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 : 100 vh; |
padding : 1 rem; |
background-color : #fafafa ; |
} |
h 1 { |
font-size : 1.25 rem; |
font-weight : 700 ; |
line-height : 1.2 ; |
} |
p { |
font-size : 0.85 rem; |
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 : 0.5 rem; |
letter-spacing : 0.0025 rem; |
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 : 1 rem; |
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 0.5 rem 1 rem -0.25 rem; |
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: 200 ms; |
} |
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: 200 ms; |
} |
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: 200 ms; |
} |
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: 200 ms; |
} |
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: 0 ms; |
transition-delay: 0 ms; |
} |
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: 0 ms; |
transition-delay: 0 ms; |
} |
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: 0 ms; |
transition-delay: 0 ms; |
} |
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: 0 ms; |
transition-delay: 0 ms; |
} |
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 0.5 rem 1 rem -0.25 rem; |
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 |