DropDownList既能选择又能输入

来源：互联网发布：大追捕知乎编辑：程序博客网时间：2024/04/28 07:02

<html>
<head>
<style>

</style>
</head>
<script>
<!--
function addOption(pos){

if(event.keyCode==13)
{
  var select_obj = document.getElementById("myselect");
  var text_value   = document.getElementById("test").value;

  if (select_obj.length)
  {
   for (var i=0;i<select_obj.length;i++)
   {
    // 如果已经存在，不添加，直接退出
    if (select_obj.options[i].text==text_value)
     alert("选项已存在，请重新输入");

          return;

   }
  }
  var the_option= new Option(text_value,text_value);

  select_obj.add(the_option);

  select_obj.selectedIndex = select_obj.options.length-1
}

}
//-->
</script>
<div class="cls1" style="clip: rect(3 280 21 110)">
  <select name="myselect" style="width:127" onchange="document.getElementById('test').value=this.value">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
  </select>
</div>
<div class="cls2">
<input type="text" name="test" onkeydown="addOption()" size="20" style="width: 127; height: 23">
</div>

</body>
</html>