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<html>
<head> </head>
<body>
<form name= "a ">
<table name= "b ">
<tr name= "c " >
<td name= "d " >
<select name= "e " onchange= "xx(this.parentElement.parentElement.parentElement.name) ">
<option > 1 </option>
<option > 2 </option>
<option > 3 </option>
<option > 4 </option>
</select>
</td>
<td> </td>
</tr>
<tr> </tr>
</table>
</form>
</body>
<script language= "javascript ">
function xx(a)
{
alert(a);
}
</script>
</html>
//输出undefined 为什么了? 不是应该输出b么?
改成 this.parentElement.parentElement.parentElement.parentElement.name 正确输出
其实代码应该这样理解
<table>
<tbody>
<tr>
<td>
</td>
</tr>
有如：
<SCRIPT language="javascript">
function showHide(obj){
var oStyle = obj.parentElement.parentElement.parentElement.rows[1].style;
// obj.parentElement.parentElement.parentElement.rows[1].这里获取的是TABLE 第二行 id为sub的单元行
oStyle.display == "none" ? oStyle.display = "block" : oStyle.display = "none";
}
</SCRIPT>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</HEAD>
<BODY bgColor="#9aadcd" leftMargin="0" topMargin="0" >
<br>
<asp:Repeater ID="LeftMenu" runat="server" OnItemDataBound="LeftMenu_ItemDataBound" >
<ItemTemplate>
<TABLE cellSpacing="0" cellPadding="0" width="159" align="center" border="0" >
<TR >
<TD width="23"><IMG height="25" src="images/Menu/box_topleft.gif" width="23"></TD>
<TD class="ttl"
onclick="JavaScript:showHide(this);" width="129" background="images/Menu/box_topbg.gif"><%# Eval("M_CName")%></TD>
<TD width="7"><IMG height="25" src="images/Menu/box_topright.gif" width="7"></TD>
</TR>
<TR style="DISPLAY: none" id="sub">
<TD background='images/Menu/box_bg.gif' colSpan='3'>
<TABLE width='100%'>
<TBODY>
<asp:Repeater ID="LeftMenu_Sub" Runat="server" >
<ItemTemplate>
<TR>
<TD><IMG height='7' hspace='5' src='images/Menu/arrow.gif' width='5' align='absMiddle'>
<asp:HyperLink ID ="Hyperlink1" Runat ="server" Target ="mainFrame" NavigateUrl='<%# Eval("M_Directory")%>'>
<%# Eval("M_CName")%>
</asp:HyperLink>
</TD>
</TR>
</ItemTemplate>
</asp:Repeater>
</TBODY>
</TABLE>
</TD>
</TR>
<TR>
<TD colSpan="3"><IMG height='10' src='images/Menu/box_bottom.gif' width='159'></TD>
</TR>
</TABLE>
</ItemTemplate>
</asp:Repeater>
</BODY>
</html>