原生js实现下拉框，支持多选、搜索

以下是一个使用原生JavaScript实现的简单下拉框，支持多选和搜索的示例代码：




<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Multi-Select Dropdown with Search</title>
<style>
  .dropdown {
    position: relative;
    display: inline-block;
  }
  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
  }
  .dropdown-content label {
    display: block;
  }
  .dropdown-content label:hover {
    background-color: #f1f1f1;
  }
  .show {display: block;}
</style>
</head>
<body>
 
<div class="dropdown">
  <input type="text" id="myInput" onkeyup="filterFunction()" placeholder="Search.." title="Type in a name">
  <div id="myDropdown" class="dropdown-content">
    <label><input type="checkbox" name="vehicle" value="Bike"> Bike</label>
    <label><input type="checkbox" name="vehicle" value="Car"> Car</label>
    <label><input type="checkbox" name="vehicle" value="Boat"> Boat</label>
    <label><input type="checkbox" name="vehicle" value="Airplane"> Airplane</label>
  </div>
</div>
 
<script>
function filterFunction() {
  var input, filter, ul, li, a, i;
  input = document.getElementById("myInput");
  filter = input.value.toUpperCase();
  div = document.getElementById("myDropdown");
  a = div.getElementsByTagName("label");
 
  for (i = 0; i < a.length; i++) {
    txtValue = a[i].textContent || a[i].innerText;
    if (txtValue.toUpperCase().indexOf(filter) > -1) {
      a[i].style.display = "";
    } else {
      a[i].style.display = "none";
    }
  }
}
</script>
 
</body>
</html>

这段代码实现了一个简单的下拉框，用户可以通过输入来搜索和筛选选项。当用户在搜索框中输入时，下拉内容会根据用户的输入实时更新显示。选中的选项（复选框）会被提交，以便在表单提交时使用。

原生js实现下拉框，支持多选、搜索

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