问题描述
这是页面代码：<divid="searchbox"><divclass="city"><span>城市：</span><divid="search_div_inside"><divid="search_select"onclick="showcitydiv()"runat="server">北京<asp:HiddenFieldID="hid_cityId"runat="server"/></div></div><asp:BulletedListID="search_menu"CssClass="hc"runat="server"DataSourceID="odsTop9Citys"DataTextField="Name"DataValueField="Id"DisplayMode="LinkButton"OnClick="search_menu_Click"><asp:ListItem>更多···</asp:ListItem></asp:BulletedList></div><divid="b1"style="display:none;"><asp:TextBoxID="txt_BusLineName"runat="server"Text="请输入公交线路名称"CssClass="inputboxn1line"onkeyup="ShowSearchList(this);"onkeydown="ShowSearchList(this);"onfocus="changetext(this);"style="width:310px;"></asp:TextBox><asp:ImageButtonID="imgbtn_SearchBusLine"runat="server"ImageUrl="~/bus/image/btn_search.png"CssClass="submit_btn"/></div><divid="b2"style="display:none;"><asp:TextBoxID="txt_BusStationName"runat="server"Text="请输入公交站点名称"CssClass="inputboxn1line"onkeyup="ShowSearchList(this);"onkeydown="ShowSearchList(this);"onfocus="changetext(this);"style="width:310px;"></asp:TextBox><asp:ImageButtonID="imgbtn_SearchBusStation"runat="server"ImageUrl="~/bus/image/btn_search.png"CssClass="submit_btn"/></div><divid="b3"style="display:block;text-align:left;"><asp:TextBoxID="txt_StartStation"runat="server"CssClass="inputboxn1line"onkeyup="ShowSearchList(this);"onkeydown="ShowSearchList(this);"></asp:TextBox><imgsrc="image/hc.gif"style="border:0px"class="img01"alt=""/><asp:TextBoxID="txt_EndStation"runat="server"CssClass="inputboxn1line"onkeyup="ShowSearchList(this);"onkeydown="ShowSearchList(this);"></asp:TextBox><asp:ImageButtonID="imgbtn_SearchHuanCheng"runat="server"ImageUrl="~/bus/image/btn_search.png"CssClass="submit_btn"/></div></div><divid="tab"><ul><liclass="none"></li><liid="tab1"onclick="setTab(1)">公交线路</li><liid="tab2"onclick="setTab(2)">公交站点</li><liid="tab3"onclick="setTab(3)"class="selected">公交换乘</li><liclass="none"></li></ul></div><divclass="c"></div>这是css样式：#search_menu{/*城市下拉列表菜单*/BORDER-RIGHT:#7f9db91pxsolid;PADDING-RIGHT:0px;BORDER-TOP:#7f9db91px;POSITION:absolute;PADDING-LEFT:0px;FONT-SIZE:14px;Z-INDEX:10000;LEFT:50px;PADDING-BOTTOM:0px;MARGIN:0px;BORDER-LEFT:#7f9db91pxsolid;PADDING-TOP:0px;BORDER-BOTTOM:#7f9db91pxsolid;LIST-STYLE-TYPE:none;TOP:27px;}
解决方案
解决方案二：
只有在层绝对定位时，z-index才有效