怎麼為Html的Select加提示

來源:互聯網
上載者:User
select <Html>
<Head>
<SCRIPT LANGUAGE="JavaScript">
<!--
//定義 select 原值
var oldValue,oldText;
//select下拉框的onkeydown事件,修改下拉框的值
function catch_keydown(sel)
{
switch(event.keyCode)
{
 case 13: //斷行符號鍵
  event.returnValue = false;
  break;
 case 27: //Esc鍵
  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[sel.selectedIndex].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,儲存下拉框原來的值
function catch_focus(sel) {
oldText = sel.options[sel.selectedIndex].value;
oldValue = sel.options[sel.selectedIndex].value;
}

//恢複select下拉式清單當前選中的值
function LoadSelect(obj,value)
{
for (var i=0; i< obj.options.length; i++)
 if (obj.options[i].value == value)
 {
  obj.selectedIndex = i;
  break;
 }
}

//select 選擇框滑鼠上移時提示選擇的內容
function selMouseOver(obj)
{
with (document.all.div_hint)
{
 innerText = obj.options[obj.selectedIndex].text;
 if (innerText.length > 0)
 {
  innerText = " " + innerText + " ";
  style.display = "block";
  style.left = event.clientX + 16;
  style.top = event.clientY;
 }
}
}

//select 選擇框滑鼠移開時消失
function selMouseOut(obj)
{
with (document.all.div_hint)
{
 style.display = "none"
}
}
//-->
</SCRIPT>
</Head>
<Body>
<!--調用-->
<select style='width:130px;z-index:-1' name='tmpSel' onmouseover=selMouseOver(this) onmouseout=selMouseOut(this) onkeydown=catch_keydown(this) onkeypress=catch_press(this) onfocus=catch_focus(this)>
<option value=''></option>
</select>

<!--提示塊-->
<div id=div_hint style="font-size:12px;color:red;display:none;position:absolute; z-index:2; top:200;background-color: #F7F7F7; layer-background-color: #0099FF; border: 1px #9c9c9c solid;filter:Alpha(style=0,opacity=80,finishOpacity=100);"></div>
</Body>
</Html>

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