搜索框

wenking 8/28/2023 通用组件

当我们在使用文本域的时候，如果内容超过了文本域的高度，那么将出现滚动条，这个在搜索框是不被期望的，这个样式可以通过js实现

const textarea = document.querySelector('#search');

textarea.addEventListener("input", function (e) {
    // 如果不写改行，哪么删除之前的内容，文本域不会缩小
    this.style.height = 'auto';
    // 设置文本域的高度等于内容的总高度
    this.style.height = e.target.scrollHeight + 'px';
})

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完整代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        .main {
            width: 1200px;
            margin: 0 auto;
            text-align: center;
        }

        .search-form {
            width: 480px;
            padding: 5px 0;
            margin: 20px auto;
            border: 2px solid transparent;
            border-radius: 10px;
            position: relative;

            text-align: left;
        }

        #search {
            resize: none;
            font-size: 24px;
            border: none;
            margin-left: 10px;
        }

        #search:focus {
            outline: none;
        }

        #search-btn {
            width: 80px;
            border: none;
            font-size: 18px;
            background-color: #ffc107;
            height: 27px;
            position: absolute;
        }

        .search-form:has(#search:focus) {
            border: 2px solid rgba(0, 0, 0, 0.3);
        }


    </style>
</head>
<body>
<div class="main">

    <img height="100" width="300"
         src="https://www.google.com.hk//images/branding/googlelogo/2x/googlelogo_color_272x92dp.png" alt=""/>

    <div class="search-area">
        <form class="search-form" action="">
            <label for="search"></label>
            <textarea name="search" id="search" cols="30" rows="1"></textarea>
            <input type="submit" id="search-btn" value="搜索"/>
        </form>
    </div>


</div>
</body>

<script>
    const textarea = document.querySelector('#search');

    textarea.addEventListener("input", function (e) {
        this.style.height = 'auto';
        this.style.height = e.target.scrollHeight + 'px';
    })

    const searchBtn = document.querySelector("#search-btn");

    searchBtn.addEventListener("click", function (e) {
        e.preventDefault();
        alert(textarea.value);
        textarea.value = "";
    })

    textarea.addEventListener("keydown", function (e) {
        if (e.keyCode == 13) {
            searchBtn.click();
            e.preventDefault();
        }
    })
</script>
</html>

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