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js如何实现select下拉框选择

王林

发布： 2020-03-21 10:53:50

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js如何实现select下拉框选择

首先来看一下效果图：

（推荐教程：js教程）

具体代码如下：

<html>
<head>
  <meta charset="UTF-8">
  <title>自定义select</title>
</head>
<style>
  *{
    margin: 0;
    padding: 0;
  }
  #main{
    position: relative;
    width: 280px;
    height: 42px;
  }
  #content{
    width: 280px;
    height: 42px;
    line-height: 42px;
    padding-left: 10px;
    background: rgb(255, 255, 255);
    border-radius: 2px;
    border: 1px solid rgb(221, 221, 221);
    font-size: 16px;
    font-family: MicrosoftYaHei;
    color: rgb(51, 51, 51);
    cursor: pointer;
  }
  #selectImg{
    position: absolute;
    top:13px;
    right: 10px;
    cursor: pointer;
  }
  #selectItem{
    display: none;
    border: 1px solid #eee;
    width: 290px;
  }
  #selectItem ul{
    list-style: none;
  }
  #selectItem ul li{
    height: 30px;
    line-height: 30px;
    padding-left: 10px;
    cursor: pointer;
  }
  #selectItem ul li:hover{
    background-color:#f5f7fa;
  }
</style>
<body>
  <div id="main">
    <div id="content">

    </div>
    @@##@@
    <div id="selectItem">
    <!--  <ul>
        <li data-value="1">北京</li>
        <li data-value="2">上海</li>
        <li data-value="3">深圳</li>
      </ul>-->
    </div>
  </div>

</body>
<script>
  var data = [{name:'北京',value:'1'},{name:'上海',value:'2'},{name:'广州',value:'3'}]
  var content = document.getElementById('content');
  var selectImg = document.getElementById('selectImg');
  var selectItem = document.getElementById('selectItem');

  var ul = document.createElement('ul');
  selectItem.appendChild(ul);
  for(var i = 0; i < data.length; i++){
    var li = document.createElement('li');
    li.setAttribute('data-value',data[i].value);
    li.innerText = data[i].name;
    ul.appendChild(li);
  }
  /**
   * 点击下拉箭头
   */
  selectImg.onclick = function () {
    console.log(selectItem.style.display);
    if(selectItem.style.display == 'none' || selectItem.style.display == ''){
      selectItem.style.display = 'block';
    }else{
      selectItem.style.display = 'none';
    }

  }

  content.onclick = function () {
    if(selectItem.style.display == 'none' || selectItem.style.display == ''){
      selectItem.style.display = 'block';
    }else{
      selectItem.style.display = 'none';
    }
  }

  var lis = selectItem.getElementsByTagName('li');
  for(var i = 0; i < lis.length; i++){
    lis[i].onclick = function () {
      console.log(this.innerHTML,this.getAttribute('data-value'));
      content.innerText = this.innerHTML;
      selectItem.style.display = 'none';
    }
  }
</script>
</html>

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