仿TB搜索框

编辑本博客
输入框，this.oninput事件监控输入框的状态
父相对定位，子元素绝对定位
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>模拟tb搜索框</title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
        #search{
            position: relative;
            /*float: left;*/
            width: 500px;
            /*height: 50px;*/
            margin: 0 auto;
            background-color: #556B2F;
            
        }
        input{
            outline: none;
            display: block;
            float: left;
            width: 200px;
            height: 30px;
            font-size: 20px;
            border: 1px solid red;
            -webkit-border-radius: 10px;
            -moz-border-radius: 10px;
            border-radius: 10px;
            padding-left: 5px;
        }
        #msg{
            left: 10px;
            position: absolute;
            font-size: 10px;
            line-height: 30px;
            color: #A9A9A9;
        }

    </style>
</head>
<body>
    <div id="search">
        <input type="text" id="text"><!--行内元素-->
        <label for="text" id="msg">Search</label>
    </div>
    <script type="text/javascript">
        var txt=document.getElementById("text");
        var msg=document.getElementById("msg");
        txt.oninput=function (ev) {
            if(this.value==""){
                msg.style.display="block";
            }else {
                msg.style.display="none";
            }
        }
    </script>
</body>
</html>
View Code
仿TB搜索框

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