JavaScript 系列四：第1課

autosize 套件

by applelily

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JavaScript 系列四：第1課 ── autosize 套件</title>
    <link rel="stylesheet" href="./01_js_autosize.css">

</head>
<body>
    <div class="bbs">
        <div class="inputBox">
            <input type="text" required spellcheck="false">
            <span class="labelline" >暱稱</span>
        </div>
        <div class="inputBox">
            <textarea name="message" rows="3" spellcheck="false" required></textarea>  
            <span class="labelline" >留言</span>
        </div>

        <div class="btn-container">
            <a href="#" class="btn">送出</a>
        </div>

    </div> 


    <script src="https://cdnjs.cloudflare.com/ajax/libs/autosize.js/6.0.1/autosize.min.js" integrity="sha512-OjjaC+tijryqhyPqy7jWSPCRj7fcosu1zreTX1k+OWSwu6uSqLLQ2kxaqL9UpR7xFaPsCwhMf1bQABw2rCxMbg==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
    <script src="./01_js_autosize.js"></script>
</body>
</html>

CSS

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none;

}
body{
    background-color: #f1f1f1;
}
.bbs {
    display: flex;
    align-items: center;
    flex-direction: column;   
    margin: 40px auto;
    max-width: 560px;
    min-height: 50vh;
    background-color: #1d2b3a;
    border-radius: 8px;
    box-shadow: rgba(116, 114, 114, 0.05) 0px 0px 0px 1px, rgb(209, 213, 219) 0px 0px 0px 1px inset;
    padding: 30px;
    gap: 30px;
}

.inputBox{
    position: relative;
    width: 400px;
}
.inputBox input , textarea{
    width: 100%;
    border: 1px solid rgba(255,255,255,0.25);
    background: #1d2b3a;
    border-radius: 5px;
    outline: none;
    padding: 10px;
    /* color: #fff; */
    color: #bdbabac9;
    font-size: 1.5em;
    transition: 0.5s;
 }

 .inputBox textarea{
    resize: none;
 }

.inputBox span{
    position: absolute;
    left: 0;
    padding: 10px;
    pointer-events: none;
    font-size: 1em;
    color: rgba(255,255,255,0.25);
    transition: 0.5s;
}
 .inputBox input:focus ~ span ,
 .inputBox input:valid ~ span ,
 .inputBox textarea:focus ~ span,
 .inputBox textarea:valid ~ span
 { 
    color: #00dfc4;
    transform: translateX(10px) translateY(-9px);
    font-size: 0.9em;
    padding: 0 10px ;
    background: #1d2b3a;
    /* border-left: 1px solid #00dfc4 ;
    border-right: 1px solid #00dfc4 ; */
 }

 .inputBox input:focus  ,
 .inputBox input:valid  ,
 .inputBox textarea:focus,
 .inputBox textarea:valid 
 { 
    border: 1px solid #00dfc4 ;
 }

 


 .btn {
    
    text-decoration: none;
    display: inline-block;
    padding: 10px 20px;
    background-color: #000;
    color: #fff;
    border-radius: 5px;
    width: auto;
}
 .btn:hover{
    background-color: #00dfc5a5;
    
}

JavaScript

autosize(document.querySelectorAll('textarea'));