下拉選單 某值 不可選

標題群組

<SELECT>
	<OPTGROUP label="麵包">
	<OPTION selected>起司麵包</OPTION>
	<OPTION>菠蘿麵包</OPTION>
	<OPTION>草莓麵包</OPTION>
	<OPTION>布丁麵包</OPTION>
	</OPTGROUP>
	<OPTGROUP label="蛋糕">
	<OPTION>奶油布丁蛋糕</OPTION>
	<OPTION>冰淇淋蛋糕</OPTION>
	<OPTION>水果蛋糕</OPTION>
	</OPTGROUP>
	</SELECT>

參考: http://www.blueshop.com.tw/board/FUM20041006152641OLG/BRD20091007215357WBF.html








特定選項不能選
<script type="text/javascript">
function treat(sel)
{ nochoice = [0,1,4,5]
  for ( var num in nochoice )
    sel.options[nochoice[num]].selected = false
}
</script>

<select name="select2" size="5" multiple class="p12" id="select2" onchange="treat(this)">
<option selected>-------------------------------</option>
<option>[標題一]</option>
<option>aaa</option>
<option>bbb</option>
<option>----------------------------------------</option>
<option>[標題二]</option>
<option>ccc</option>
<option>ddd</option>
</select>




參考: http://tw.knowledge.yahoo.com/question/question?qid=1009100708010