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<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>網頁特效 改變select 的selectedindex</title>
<script>
function fn_dodefaultselect ( theselect , thedefaultvalue )
{
if ( theselect )
{
for ( var i=0; i<theselect.options.length; i++ )
{
if ( theselect.options[i].value == thedefaultvalue )
{
theselect.selectedindex = i ;
break;
}
}
}
}
</script>
</head><body>
<form id="form1" name="form1" method="post" action="">
<label for="select"></label>
<select name="select" id="select">
<option value="1" selected="selected">a</option>
<option value="2">b</option>
<option value="3">c</option>
<option value="4">d</option>
</select>
<input type="button" name="button" id="button" value="設定c為選擇狀態" onclick="javascript:return fn_dodefaultselect(form1.select,3);" />
</form>
</body>
</html>
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