【JavaScript】让select选择框可输入和可下拉选择：-Toy模板网

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【1】Html+CSS兼容IE实现

基本原理：使用 input/select 两个元素，然后 input 覆盖在 select 上层，宽度并比select窄一点，这样用户就能点到select的箭头弹出下拉框

<div class="select-editable">
    <select onchange="this.nextElementSibling.value=this.value">
        <option value=""></option>
        <option value="115x175 mm">115x175 mm</option>
        <option value="120x160 mm">120x160 mm</option>
        <option value="120x287 mm">120x287 mm</option>
    </select>
    <input type="text" name="format" value="" />
</div>

.select-editable {
     position:relative;
     background-color:white;
     border:solid grey 1px;
     width:120px;
     height:18px;
 }
 .select-editable select {
     position:absolute;
     top:0px;
     left:0px;
     font-size:14px;
     border:none;
     width:120px;
     margin:0;
 }
 .select-editable input {
     position:absolute;
     top:0px;
     left:0px;
     width:100px;
     padding:1px;
     font-size:12px;
     border:none;
 }
 .select-editable select:focus, .select-editable input:focus {
     outline:none;
 }

select可输入可选择,JavaScript,javascript,前端,css

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .select-editable {
      position: relative;
      background-color: white;
      border: solid grey 1px;
      width: 120px;
      height: 18px;
    }

    .select-editable select {
      position: absolute;
      top: 0px;
      left: 0px;
      font-size: 14px;
      border: none;
      width: 120px;
      margin: 0;
    }

    .select-editable input {
      position: absolute;
      top: 0px;
      left: 0px;
      width: 100px;
      padding: 1px;
      font-size: 12px;
      border: none;
    }

    .select-editable select:focus,
    .select-editable input:focus {
      outline: none;
    }
  </style>

  <script src="./jquery.min.js"></script>
</head>

<body>
  <div class="select-editable">
    <select onchange="this.nextElementSibling.value=this.value" id="cookies">
      <!-- <option value=""></option>
      <option value="115x175 mm">115x175 mm</option>
      <option value="120x160 mm">120x160 mm</option>
      <option value="120x287 mm">120x287 mm</option> -->
    </select>
    <input type="text" name="format" value="" />
  </div>

  <script>
    window.onload = function () {
      var optionList = [
        { value: '1' },
        { value: '2' },
        { value: '3' },
        { value: '4' },
        { value: '5' },
      ]
      $('#cookies').empty()
      if (optionList && optionList.length > 0) {
        for (var i = 0; i < optionList.length; i++) {
          $('#cookies').append(`<option value="` + optionList[i].value + `">`+optionList[i].value+`</option>`);
        }
      }
    }
  </script>
</body>

</html>

【2】datalist

Datalist是HTML5的原生标签，用于向input提供下拉和自动提示选项，支持输入和下拉选择两种方式。但是目前IE10及其以下浏览器并不支持，并且IE11无法触发input和change事件，相当于IE系列均无法很好地实现。如果仅支持Chrome或Eletron桌面的应用则可以放心使用。

<input list="cookies" placeholder="Type of Cookie"/>

<datalist id="cookies">
    <option value="Chocolate Chip"/>
    <option value="Peanut Butter"/>
    <option value="Raisin Oatmeal"/>
</datalist>

select可输入可选择,JavaScript,javascript,前端,css 文章来源地址https://www.toymoban.com/news/detail-732393.html

<body>
  <div>
    <input list="cookies" placeholder="请选择或输入" />
    <datalist id="cookies">
      <!-- <option value="Chocolate Chip" />
      <option value="Peanut Butter" />
      <option value="Raisin Oatmeal" /> -->
    </datalist>
  </div>

  <script>
    window.onload = function () {
      var optionList = [
        { value: '1' },
        { value: '2' },
        { value: '3' },
        { value: '4' },
        { value: '5' },
      ]
      $('#cookies').empty()
      if (optionList && optionList.length > 0) {
        for (var i = 0; i < optionList.length; i++) {
          $('#cookies').append(`<option value="` + optionList[i].value + `" />`);
        }
      }
    }
  </script>
</body>

</html>