select支持手动输入

//select下拉框的onkeydown事件，修改下拉框的值
  function catch_keydown(sel){
   switch(event.keyCode) {
    case 13: //回车键
     event.returnValue = false;
     break;
    case 27: //Esc键
     sel.options[sel.selectedIndex].text = oldText;
     sel.options[sel.selectedIndex].value = oldValue;
     event.returnValue = false;
     break;
    case 8:  //空格健
     var s = sel.options[sel.selectedIndex].text;
     s = s.substr(0,s.length-1);
     if (sel.options[0].value==sel.options[sel.selectedIndex].text){
      sel.options[sel.selectedIndex].value=s;
      sel.options[sel.selectedIndex].text=s;
     }
     event.returnValue = false;
     break;
   }
   if (!event.returnValue && sel.onchange)
    sel.onchange(sel)
  } 

 

//select下拉框的onkeypress事件，修改下拉框的值
  function catch_press(sel){
   if(sel.selectedIndex>=0){
    var s = sel.options[sel.selectedIndex].text + String.fromCharCode(event.keyCode);
    if (sel.options[sel.selectedIndex].value==sel.options[sel.selectedIndex].text){
     sel.options[sel.selectedIndex].value=s;
     sel.options[sel.selectedIndex].text=s;
    }
    event.returnValue = false;
    if (!event.returnValue && sel.onchange)
     sel.onchange(sel)
   }
  } 

//select下拉框的onfocus事件，保存下拉框原来的值
  function catch_focus(sel) {
   oldText = sel.options[sel.selectedIndex].value;
   oldValue = sel.options[sel.selectedIndex].value;
  }   

<select style='width:130px;z-index:-1' name='tmpSel'    onkeydown=catch_keydown(this) onkeypress=catch_press(this) onfocus=catch_focus(this)>
  <option value=''>option>
  <option value=''>Aoption>
  <option value=''>Boption>
  <option value=''>Coption>
select>

 

转载于:https://www.cnblogs.com/lcj0308/p/4773832.html