莽夫

自定义input

利用弹性过渡自定义一个带 tip 提示框的 input 输入框

效果图

html

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<main class="main">
    <label>
        <input
               type="text"
               required
               id="username"
               autocomplete="off"
               placeholder="请输入内容"
               pattern="^\w+$"
               />
        <span class="poptip">仅支持字母, 数字和下划线组合!!</span>
    </label>
</main>

css

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main {
    width: 100%;
    height: 229px;
    display: flex;
}
label {
    margin: auto;
}
input {
    display: block;
    width: 229px;
    padding: 0.8em;
    outline: none;
    border: 1px solid #e3e3e3;
    border-radius: 2px;
}
input:focus,
input:hover {
    border-color: #b4a078;
}
input:not(:placeholder-shown) {
    border-color: #be4141;
    box-shadow: 0 0 0 2px rgba(255, 100, 97, 0.2);
}
input:not(:placeholder-shown) + .poptip {
    color: #be4141;
}
input:valid {
    border-color: #b4a078;
    box-shadow: 0 0 0 2px rgba(180, 160, 120, 0.2);
}
input:valid + .poptip {
    color: unset;
}
input:not(:focus) + .poptip {
    transform: scale(0);
    animation: elastic-dec 0.15s;
}
@keyframes elastic-dec {
    from {
        transform: scale(1);
    }
    to {
        transform: scale(0);
        animation-timing-function: cubic-bezier(0.25, 0.1, 0.25, 0.1);
    }
}
input:focus + .poptip {
    transform: scale(1);
    animation: elastic-grow 0.25s;
}
@keyframes elastic-grow {
    from {
        transform: scale(0);
    }
    70% {
        transform: scale(1);
        animation-timing-function: cubic-bezier(0.1, 0.25, 0.1, 0.25);
    }
}
.poptip {
    display: inline-block;
    width: 236px;
    font-size: 13px;
    padding: 0.6em;
    background: #fafafa;
    position: relative;
    margin-left: -3px;
    margin-top: 6px;
    border-radius: 2px;
    filter: drop-shadow(0 0 1px rgba(0, 0, 0, 0.23456));
    transform-origin: 15px -6px;
}
.poptip::before {
    content: "";
    position: absolute;
    top: -6px;
    left: 10px;
    border: 9px solid transparent;
    border-bottom-color: #fafafa;
    border-top-width: 0;
}