js实现下拉框

<body>部分————————简单的布个局

<body>
    <div id="box">请选择手机名称</div>
    <div id="down">
        <ul class="phones">
            <li>华为</li>
            <li>小米</li>
            <li>oppo</li>
            <li>vivo</li>
            <li>爱疯</li>
            <li>三星</li>
        </ul>
    </div>
</body>
<style>部分
<style>
        #box{
            color: aliceblue;
            width: 110px;
            height: 25px;
            border: 1px solid #c5c5c5;
            border-radius: 10px;
            background-color: #797777;
            text-align: center;
            /* text-indent: 5px; */
            font-size: 14px;
            line-height: 25px;
            cursor: pointer;
        }
        #down{
            border: 1px solid #c5c5c5;
            width: 90px;
            margin-left: 5px;
            display: none;
        }
        ul{
            padding: 0;
            margin: 0;
        }
        li{
            list-style: none;
            font-size: 14px;
            border-bottom: 1px dashed #c5c5c5;
            text-align: center;
            height: 25px;
            line-height: 25px;
            color: aliceblue;
            background-color: #333;
            cursor: pointer;
        }
        li:hover{
            background-color: #5c0e0e;
        }
    </style>
<script>部分————————实现功能的部分
<script>
        var obox = document.getElementById("box");
        var odown = document.getElementById("down");
        var oli = document.querySelectorAll("li");
        console.log(oli);
        var timer;
        //当点击obox时，呈现出下拉列表的内容，给个延时效果
        obox.onclick = function(){
            clearInterval(timer);
            timer = setInterval(function(){
                odown.style.display = "block";
            },300)
            ///选中列表中的某一项并将其呈现在box中,隐藏下拉列表
            for(var i=0;i<oli.length;i++){
                oli[i].n = i;
                oli[i].onclick = function(){
                    obox.innerHTML = this.innerHTML;
                    odown.style.display = "none";
                    clearInterval(timer);
                }
            }
        }
</script>

带有小三角的下拉框

 <div class="wrap">
    <ul>
    <li></li>
....
    </ul>
    <div class="triangle1"></div>
    <div class="triangle2"></div>
  </div>

/*三角*/  

    .wrap>ul{position: relative;left: 0px;}
.wrap {
    position: relative;top: -2530px;left: -250px;
    background-color: rgb(15, 14, 14);
    border: 1px solid grey;
    width: 160px;
    height: 550px;
    z-index: 999;
    display: none;
    margin: 0 auto;  
  }
  .triangle1 {
    display: block;
    position: absolute;
    width: 0px;
    height: 0px;
    border: 8px solid transparent;
    border-bottom-color: rgb(112, 106, 106);
    top: -17px;
    left: 20px;
    margin:  0 auto;
  }
  .triangle2 {
    display: block;
    position: absolute;
    width: 0px;
    height: 0px;
    border: 8px solid transparent;
    top: -16px;
    border-bottom-color: rgb(14, 13, 13);
    left: 20px;
    margin: 0 auto;

  }

 

posted on 2021-12-24 14:49  狼堡的主人  阅读(1589)  评论(0)    收藏  举报