输入css表单加上输入时的特效提升用户体验效果

<div class="row">
<div class="container">
<h2>Border effects</h2>
<div class="col-3"><input class="effect-1" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-2" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-3" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-4" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-5" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-6" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-7" type="text" placeholder="Placeholder Text" />
<span class="focus-border">
<i></i>
</span></div>
<div class="col-3"><input class="effect-8" type="text" placeholder="Placeholder Text" />
<span class="focus-border">
<i></i>
</span></div>
<div class="col-3"><input class="effect-9" type="text" placeholder="Placeholder Text" />
<span class="focus-border">
<i></i>
</span></div>
<h2>Background Effects</h2>
<div class="col-3"><input class="effect-10" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-11" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-12" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-13" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-14" type="text" placeholder="Placeholder Text" /></div>
<div class="col-3"><input class="effect-15" type="text" placeholder="Placeholder Text" /></div>
<h2>Input with Label Effects</h2>
<div class="col-3 input-effect"><input class="effect-16" type="text" placeholder="" />
<label>First Name</label></div>
<div class="col-3 input-effect"><input class="effect-17" type="text" placeholder="" />
<label>First Name</label></div>
<div class="col-3 input-effect"><input class="effect-18" type="text" placeholder="" />
<label>First Name</label></div>
<div class="col-3 input-effect"><input class="effect-19" type="text" placeholder="" />
<label>First Name</label>
<span class="focus-border">
<i></i>
</span></div>
<div class="col-3 input-effect"><input class="effect-20" type="text" placeholder="" />
<label>First Name</label>
<span class="focus-border">
<i></i>
</span></div>
<div class="col-3 input-effect"><input class="effect-21" type="text" placeholder="" />
<label>First Name</label>
<span class="focus-border">
<i></i>
</span></div>
<div class="col-3 input-effect"><input class="effect-22" type="text" placeholder="" />
<label>First Name</label></div>
<div class="col-3 input-effect"><input class="effect-23" type="text" placeholder="" />
<label>First Name</label></div>
<div class="col-3 input-effect"><input class="effect-24" type="text" placeholder="" />
<label>First Name</label></div>
</div>
</div>

/*= Reset CSS
============= */
html, body {border: 0; margin: 0; padding: 0;}
body {font: 14px "Lato", Arial, sans-serif; min-width: 100%; min-height: 100%; color: #666;}
.container{margin: 0 auto; max-width: 1200px;}
*{margin: 0; padding: 0; box-sizing: border-box;}
.row{float: left; width: 100%; padding: 20px 0 50px;}
h2{text-align: center; color: #2079df; font-size: 28px; float: left; width: 100%; margin: 30px 0; position: relative; line-height: 58px; font-weight: 400;}
h2:before{content: ""; position: absolute; left: 50%; bottom: 0; width: 100px; height: 2px; background-color: #2079df; margin-left: -50px;}
/*= Reset CSS End
================= */

/*= input focus effects css
=========================== */
:focus{outline: none;}

.col-3{float: left; width: 27.33%; margin: 40px 3%; position: relative;} /* necessary to give position: relative to parent. */
input[type="text"]{font: 15px/24px "Lato", Arial, sans-serif; color: #333; width: 100%; box-sizing: border-box; letter-spacing: 1px;}

.effect-1,
.effect-2,
.effect-3{border: 0; padding: 7px 0; border-bottom: 1px solid #ccc;}

.effect-1 ~ .focus-border{position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background-color: #3399FF; transition: 0.4s;}
.effect-1:focus ~ .focus-border{width: 100%; transition: 0.4s;}

.effect-2 ~ .focus-border{position: absolute; bottom: 0; left: 50%; width: 0; height: 2px; background-color: #3399FF; transition: 0.4s;}
.effect-2:focus ~ .focus-border{width: 100%; transition: 0.4s; left: 0;}

.effect-3 ~ .focus-border{position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; z-index: 99;}
.effect-3 ~ .focus-border:before,
.effect-3 ~ .focus-border:after{content: ""; position: absolute; bottom: 0; left: 0; width: 0; height: 100%; background-color: #3399FF; transition: 0.4s;}
.effect-3 ~ .focus-border:after{left: auto; right: 0;}
.effect-3:focus ~ .focus-border:before,
.effect-3:focus ~ .focus-border:after{width: 50%; transition: 0.4s;}

.effect-4,
.effect-5,
.effect-6{border: 0; padding: 5px 0 7px; border: 1px solid transparent; border-bottom-color: #ccc; transition: 0.4s;}

.effect-4:focus,
.effect-5:focus,
.effect-6:focus{padding: 5px 14px 7px; transition: 0.4s;}

.effect-4 ~ .focus-border{position: absolute; height: 0; bottom: 0; left: 0; width: 100%; transition: 0.4s; z-index: -1;}
.effect-4:focus ~ .focus-border{transition: 0.4s; height: 36px; border: 2px solid #3399FF; z-index: 1;}

.effect-5 ~ .focus-border{position: absolute; height: 36px; bottom: 0; left: 0; width: 0; transition: 0.4s;}
.effect-5:focus ~ .focus-border{width: 100%; transition: 0.4s; border: 2px solid #3399FF;}

.effect-6 ~ .focus-border{position: absolute; height: 36px; bottom: 0; right: 0; width: 0; transition: 0.4s;}
.effect-6:focus ~ .focus-border{width: 100%; transition: 0.4s; border: 2px solid #3399FF;}

.effect-7,
.effect-8,
.effect-9{border: 1px solid #ccc; padding: 7px 14px 9px; transition: 0.4s;}

.effect-7 ~ .focus-border:before,
.effect-7 ~ .focus-border:after{content: ""; position: absolute; top: 0; left: 50%; width: 0; height: 2px; background-color: #3399FF; transition: 0.4s;}
.effect-7 ~ .focus-border:after{top: auto; bottom: 0;}
.effect-7 ~ .focus-border i:before,
.effect-7 ~ .focus-border i:after{content: ""; position: absolute; top: 50%; left: 0; width: 2px; height: 0; background-color: #3399FF; transition: 0.6s;}
.effect-7 ~ .focus-border i:after{left: auto; right: 0;}
.effect-7:focus ~ .focus-border:before,
.effect-7:focus ~ .focus-border:after{left: 0; width: 100%; transition: 0.4s;}
.effect-7:focus ~ .focus-border i:before,
.effect-7:focus ~ .focus-border i:after{top: 0; height: 100%; transition: 0.6s;}

.effect-8 ~ .focus-border:before,
.effect-8 ~ .focus-border:after{content: ""; position: absolute; top: 0; left: 0; width: 0; height: 2px; background-color: #3399FF; transition: 0.3s;}
.effect-8 ~ .focus-border:after{top: auto; bottom: 0; left: auto; right: 0;}
.effect-8 ~ .focus-border i:before,
.effect-8 ~ .focus-border i:after{content: ""; position: absolute; top: 0; left: 0; width: 2px; height: 0; background-color: #3399FF; transition: 0.4s;}
.effect-8 ~ .focus-border i:after{left: auto; right: 0; top: auto; bottom: 0;}
.effect-8:focus ~ .focus-border:before,
.effect-8:focus ~ .focus-border:after{width: 100%; transition: 0.3s;}
.effect-8:focus ~ .focus-border i:before,
.effect-8:focus ~ .focus-border i:after{height: 100%; transition: 0.4s;}

.effect-9 ~ .focus-border:before,
.effect-9 ~ .focus-border:after{content: ""; position: absolute; top: 0; right: 0; width: 0; height: 2px; background-color: #3399FF; transition: 0.2s; transition-delay: 0.2s;}
.effect-9 ~ .focus-border:after{top: auto; bottom: 0; right: auto; left: 0; transition-delay: 0.6s;}
.effect-9 ~ .focus-border i:before,
.effect-9 ~ .focus-border i:after{content: ""; position: absolute; top: 0; left: 0; width: 2px; height: 0; background-color: #3399FF; transition: 0.2s;}
.effect-9 ~ .focus-border i:after{left: auto; right: 0; top: auto; bottom: 0; transition-delay: 0.4s;}
.effect-9:focus ~ .focus-border:before,
.effect-9:focus ~ .focus-border:after{width: 100%; transition: 0.2s; transition-delay: 0.6s;}
.effect-9:focus ~ .focus-border:after{transition-delay: 0.2s;}
.effect-9:focus ~ .focus-border i:before,
.effect-9:focus ~ .focus-border i:after{height: 100%; transition: 0.2s;}
.effect-9:focus ~ .focus-border i:after{transition-delay: 0.4s;}

.effect-10,
.effect-11,
.effect-12,
.effect-13,
.effect-14,
.effect-15{border: 0; padding: 7px 15px; border: 1px solid #ccc; position: relative; background: transparent;}

.effect-10 ~ .focus-bg{position: absolute; left: 0; top: 0; width: 100%; height: 100%; background-color: #ededed; opacity: 0; transition: 0.5s; z-index: -1;}
.effect-10:focus ~ .focus-bg{transition: 0.5s; opacity: 1;}

.effect-11 ~ .focus-bg{position: absolute; left: 0; top: 0; width: 0; height: 100%; background-color: #ededed; transition: 0.3s; z-index: -1;}
.effect-11:focus ~ .focus-bg{transition: 0.3s; width: 100%;}

.effect-12 ~ .focus-bg{position: absolute; left: 50%; top: 0; width: 0; height: 100%; background-color: #ededed; transition: 0.3s; z-index: -1;}
.effect-12:focus ~ .focus-bg{transition: 0.3s; width: 100%; left: 0;}

.effect-13 ~ .focus-bg:before,
.effect-13 ~ .focus-bg:after{content: ""; position: absolute; left: 0; top: 0; width: 0; height: 100%; background-color: #ededed; transition: 0.3s; z-index: -1;}
.effect-13:focus ~ .focus-bg:before{transition: 0.3s; width: 50%;}
.effect-13 ~ .focus-bg:after{left: auto; right: 0;}
.effect-13:focus ~ .focus-bg:after{transition: 0.3s; width: 50%;}

.effect-14 ~ .focus-bg:before,
.effect-14 ~ .focus-bg:after{content: ""; position: absolute; left: 0; top: 0; width: 0; height: 0; background-color: #ededed; transition: 0.3s; z-index: -1;}
.effect-14:focus ~ .focus-bg:before{transition: 0.3s; width: 50%; height: 100%;}
.effect-14 ~ .focus-bg:after{left: auto; right: 0; top: auto; bottom: 0;}
.effect-14:focus ~ .focus-bg:after{transition: 0.3s; width: 50%; height: 100%;}

.effect-15 ~ .focus-bg:before,
.effect-15 ~ .focus-bg:after{content: ""; position: absolute; left: 50%; top: 50%; width: 0; height: 0; background-color: #ededed; transition: 0.3s; z-index: -1;}
.effect-15:focus ~ .focus-bg:before{transition: 0.3s; width: 50%; left: 0; top: 0; height: 100%;}
.effect-15 ~ .focus-bg:after{left: auto; right: 50%; top: auto; bottom: 50%;}
.effect-15:focus ~ .focus-bg:after{transition: 0.3s; width: 50%; height: 100%; bottom: 0; right: 0;}

.effect-16,
.effect-17,
.effect-18{border: 0; padding: 4px 0; border-bottom: 1px solid #ccc; background-color: transparent;}

.effect-16 ~ .focus-border{position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background-color: #3399FF; transition: 0.4s;}
.effect-16:focus ~ .focus-border,
.has-content.effect-16 ~ .focus-border{width: 100%; transition: 0.4s;}
.effect-16 ~ label{position: absolute; left: 0; width: 100%; top: 9px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-16:focus ~ label, .has-content.effect-16 ~ label{top: -16px; font-size: 12px; color: #3399FF; transition: 0.3s;}

.effect-17 ~ .focus-border{position: absolute; bottom: 0; left: 50%; width: 0; height: 2px; background-color: #3399FF; transition: 0.4s;}
.effect-17:focus ~ .focus-border,
.has-content.effect-17 ~ .focus-border{width: 100%; transition: 0.4s; left: 0;}
.effect-17 ~ label{position: absolute; left: 0; width: 100%; top: 9px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-17:focus ~ label, .has-content.effect-17 ~ label{top: -16px; font-size: 12px; color: #3399FF; transition: 0.3s;}

.effect-18 ~ .focus-border{position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; z-index: 99;}
.effect-18 ~ .focus-border:before,
.effect-18 ~ .focus-border:after{content: ""; position: absolute; bottom: 0; left: 0; width: 0; height: 100%; background-color: #3399FF; transition: 0.4s;}
.effect-18 ~ .focus-border:after{left: auto; right: 0;}
.effect-18:focus ~ .focus-border:before,
.effect-18:focus ~ .focus-border:after,
.has-content.effect-18 ~ .focus-border:before,
.has-content.effect-18 ~ .focus-border:after{width: 50%; transition: 0.4s;}
.effect-18 ~ label{position: absolute; left: 0; width: 100%; top: 9px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-18:focus ~ label, .has-content.effect-18 ~ label{top: -16px; font-size: 12px; color: #3399FF; transition: 0.3s;}

.effect-19,
.effect-20,
.effect-21{border: 1px solid #ccc; padding: 7px 14px; transition: 0.4s; background: transparent;}

.effect-19 ~ .focus-border:before,
.effect-19 ~ .focus-border:after{content: ""; position: absolute; top: -1px; left: 50%; width: 0; height: 2px; background-color: #3399FF; transition: 0.4s;}
.effect-19 ~ .focus-border:after{top: auto; bottom: 0;}
.effect-19 ~ .focus-border i:before,
.effect-19 ~ .focus-border i:after{content: ""; position: absolute; top: 50%; left: 0; width: 2px; height: 0; background-color: #3399FF; transition: 0.6s;}
.effect-19 ~ .focus-border i:after{left: auto; right: 0;}
.effect-19:focus ~ .focus-border:before,
.effect-19:focus ~ .focus-border:after,
.has-content.effect-19 ~ .focus-border:before,
.has-content.effect-19 ~ .focus-border:after{left: 0; width: 100%; transition: 0.4s;}
.effect-19:focus ~ .focus-border i:before,
.effect-19:focus ~ .focus-border i:after,
.has-content.effect-19 ~ .focus-border i:before,
.has-content.effect-19 ~ .focus-border i:after{top: -1px; height: 100%; transition: 0.6s;}
.effect-19 ~ label{position: absolute; left: 14px; width: 100%; top: 10px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-19:focus ~ label, .has-content.effect-19 ~ label{top: -18px; left: 0; font-size: 12px; color: #3399FF; transition: 0.3s;}

.effect-20 ~ .focus-border:before,
.effect-20 ~ .focus-border:after{content: ""; position: absolute; top: 0; left: 0; width: 0; height: 2px; background-color: #3399FF; transition: 0.3s;}
.effect-20 ~ .focus-border:after{top: auto; bottom: 0; left: auto; right: 0;}
.effect-20 ~ .focus-border i:before,
.effect-20 ~ .focus-border i:after{content: ""; position: absolute; top: 0; left: 0; width: 2px; height: 0; background-color: #3399FF; transition: 0.4s;}
.effect-20 ~ .focus-border i:after{left: auto; right: 0; top: auto; bottom: 0;}
.effect-20:focus ~ .focus-border:before,
.effect-20:focus ~ .focus-border:after,
.has-content.effect-20 ~ .focus-border:before,
.has-content.effect-20 ~ .focus-border:after{width: 100%; transition: 0.3s;}
.effect-20:focus ~ .focus-border i:before,
.effect-20:focus ~ .focus-border i:after,
.has-content.effect-20 ~ .focus-border i:before,
.has-content.effect-20 ~ .focus-border i:after{height: 100%; transition: 0.4s;}
.effect-20 ~ label{position: absolute; left: 14px; width: 100%; top: 10px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-20:focus ~ label, .has-content.effect-20 ~ label{top: -18px; left: 0; font-size: 12px; color: #3399FF; transition: 0.3s;}

.effect-21 ~ .focus-border:before,
.effect-21 ~ .focus-border:after{content: ""; position: absolute; top: 0; right: 0; width: 0; height: 2px; background-color: #3399FF; transition: 0.2s; transition-delay: 0.2s;}
.effect-21 ~ .focus-border:after{top: auto; bottom: 0; right: auto; left: 0; transition-delay: 0.6s;}
.effect-21 ~ .focus-border i:before,
.effect-21 ~ .focus-border i:after{content: ""; position: absolute; top: 0; left: 0; width: 2px; height: 0; background-color: #3399FF; transition: 0.2s;}
.effect-21 ~ .focus-border i:after{left: auto; right: 0; top: auto; bottom: 0; transition-delay: 0.4s;}
.effect-21:focus ~ .focus-border:before,
.effect-21:focus ~ .focus-border:after,
.has-content.effect-21 ~ .focus-border:before,
.has-content.effect-21 ~ .focus-border:after{width: 100%; transition: 0.2s; transition-delay: 0.6s;}
.effect-21:focus ~ .focus-border:after,
.has-content.effect-21 ~ .focus-border:after{transition-delay: 0.2s;}
.effect-21:focus ~ .focus-border i:before,
.effect-21:focus ~ .focus-border i:after,
.has-content.effect-21 ~ .focus-border i:before,
.has-content.effect-21 ~ .focus-border i:after{height: 100%; transition: 0.2s;}
.effect-21:focus ~ .focus-border i:after,
.has-conten.effect-21 ~ .focus-border i:after{transition-delay: 0.4s;}
.effect-21 ~ label{position: absolute; left: 14px; width: 100%; top: 10px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-21:focus ~ label, .has-content.effect-21 ~ label{top: -18px; left: 0; font-size: 12px; color: #3399FF; transition: 0.3s;}

.effect-22,
.effect-23,
.effect-24{border: 0; padding: 7px 15px; border: 1px solid #ccc; position: relative; background: transparent;}

.effect-22 ~ .focus-bg{position: absolute; left: 0; top: 0; width: 0; height: 100%; background-color: transparent; transition: 0.4s; z-index: -1;}
.effect-22:focus ~ .focus-bg,
.has-content.effect-22 ~ .focus-bg{transition: 0.4s; width: 100%; background-color: #ededed;}
.effect-22 ~ label{position: absolute; left: 14px; width: 100%; top: 10px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-22:focus ~ label, .has-content.effect-22 ~ label{top: -18px; left: 0; font-size: 12px; color: #333; transition: 0.3s;}

.effect-23 ~ .focus-bg:before,
.effect-23 ~ .focus-bg:after{content: ""; position: absolute; left: 0; top: 0; width: 0; height: 0; background-color: #ededed; transition: 0.3s; z-index: -1;}
.effect-23:focus ~ .focus-bg:before,
.has-content.effect-23 ~ .focus-bg:before{transition: 0.3s; width: 50%; height: 100%;}
.effect-23 ~ .focus-bg:after{left: auto; right: 0; top: auto; bottom: 0;}
.effect-23:focus ~ .focus-bg:after,
.has-content.effect-23 ~ .focus-bg:after{transition: 0.3s; width: 50%; height: 100%;}
.effect-23 ~ label{position: absolute; left: 14px; width: 100%; top: 10px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-23:focus ~ label, .has-content.effect-23 ~ label{top: -18px; left: 0; font-size: 12px; color: #333; transition: 0.3s;}

.effect-24 ~ .focus-bg:before,
.effect-24 ~ .focus-bg:after{content: ""; position: absolute; left: 50%; top: 50%; width: 0; height: 0; background-color: #ededed; transition: 0.3s; z-index: -1;}
.effect-24:focus ~ .focus-bg:before,
.has-content.effect-24 ~ .focus-bg:before{transition: 0.3s; width: 50%; left: 0; top: 0; height: 100%;}
.effect-24 ~ .focus-bg:after{left: auto; right: 50%; top: auto; bottom: 50%;}
.effect-24:focus ~ .focus-bg:after,
.has-content.effect-24 ~ .focus-bg:after{transition: 0.3s; width: 50%; height: 100%; bottom: 0; right: 0;}
.effect-24 ~ label{position: absolute; left: 14px; width: 100%; top: 10px; color: #aaa; transition: 0.3s; z-index: -1; letter-spacing: 0.5px;}
.effect-24:focus ~ label, .has-content.effect-24 ~ label{top: -18px; left: 0; font-size: 12px; color: #333; transition: 0.3s;}
/*= input focus effects css End
=============================== */

// JavaScript for label effects only
$(window).load(function(){
$(".col-3 input").val("");

$(".input-effect input").focusout(function(){
if($(this).val() != ""){
$(this).addClass("has-content");
}else{
$(this).removeClass("has-content");
}
})
});