input表单输入框聚焦动画特效

表单动画1

html源码

<div class="inputBox">
    <input class="effect-1" type="text" placeholder="Placeholder Text">
    <span class="focus-border">
        <i></i>
    </span>
</div>

css源码

inputBox class类用于布局，就是一个input容器，便于观看，我这里设置每一行分为3个列（可根据自己需求设置）。

.inputBox {
      float: left;
      width: 27.33%;
      margin: 40px 3%;
      position: relative; 
}  

然后为input元素设置一些通用样式。

input[type="text"]{
    font: 15px/24px "Lato", Arial, sans-serif; 
    color: #333; 
    width: 100%; 
    box-sizing: border-box; 
    letter-spacing: 1px;
}    
:focus{
    outline: none;
}

effect-1 class类就代表这不同的input表单获取焦点的动画样式种类, effect-1就代表第一种，以此类推。

.effect-1{
    border: 1px solid #ccc; 
    padding: 7px 14px 9px; 
    transition: 0.4s;
}
.effect-1 ~ .focus-border:before,
.effect-1 ~ .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-1 ~ .focus-border:after{
    top: auto; 
    bottom: 0; 
    right: auto; 
    left: 0; 
    transition-delay: 0.6s;
}
.effect-1 ~ .focus-border i:before,
.effect-1 ~ .focus-border i:after{
    content: ""; 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 2px; 
    height: 0; 
    background-color: #3399FF; 
    transition: 0.2s;
}
.effect-1 ~ .focus-border i:after{
    left: auto; 
    right: 0; 
    top: auto; 
    bottom: 0; 
    transition-delay: 0.4s;
}
.effect-1:focus ~ .focus-border:before,
.effect-1:focus ~ .focus-border:after{
    width: 100%; 
    transition: 0.2s; 
    transition-delay: 0.6s;
}
.effect-1:focus ~ .focus-border:after{
    transition-delay: 0.2s;
}
.effect-1:focus ~ .focus-border i:before,
.effect-1:focus ~ .focus-border i:after{
    height: 100%; 
    transition: 0.2s;
}
.effect-1:focus ~ .focus-border i:after{
    transition-delay: 0.4s;
}

表单动画2

html源码

<div class="inputBox">
    <input class="effect-2" type="text" placeholder="Placeholder Text">
    <span class="focus-border">
        <i></i>
    </span>
</div>

css源码

.effect-2{
    border: 1px solid #ccc; 
    padding: 7px 14px 9px; 
    transition: 0.4s;
}
.effect-2 ~ .focus-border:before,
.effect-2 ~ .focus-border:after{
    content: ""; 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 0; 
    height: 2px; 
    background-color: #3399FF; 
    transition: 0.3s;
}
.effect-2 ~ .focus-border:after{
    top: auto; 
    bottom: 0; 
    left: auto; 
    right: 0;
}
.effect-2 ~ .focus-border i:before,
.effect-2 ~ .focus-border i:after{
    content: ""; 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 2px; 
    height: 0; 
    background-color: #3399FF; 
    transition: 0.4s;
}
.effect-2 ~ .focus-border i:after{
    left: auto; 
    right: 0; 
    top: auto; 
    bottom: 0;
}
.effect-2:focus ~ .focus-border:before,
.effect-2:focus ~ .focus-border:after{
    width: 100%; 
    transition: 0.3s;
}
.effect-2:focus ~ .focus-border i:before,
.effect-2:focus ~ .focus-border i:after{
    height: 100%; 
    transition: 0.4s;
}

表单动画3

html源码

<div class="inputBox">
    <input class="effect-3" type="text" placeholder="Placeholder Text">
    <span class="focus-border">
        <i></i>
    </span>
</div>

css源码

.effect-3{
    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;
}

搬你想搬，盖你所需，码字不易，且行且珍惜！