如何用BUTTON控件控制DROPDOWNLIST是否可见??

Question

都是服务器控件,如何在点了BUUTTON以后,DROPDOWNLIST从页面消失,再点一次BUTTON,DROPDOWNLIST又呈现出来??要求页面不刷新,,用JS实现 .怎么做?

Answer 1

<script language="javascript">
<!--
function AA()
  {
var tmp = document.getElementById("DropDownList1");//DropDownList1为DropDownList ID号码
if(tmp.style.display == "none")
{
tmp.style.display = "block";
}
else
{
tmp.style.display = "none";
}
}
</script><asp:Button id="UpFile" style="Z-INDEX: 101; LEFT: 408px; POSITION: absolute; TOP: 216px" runat="server" Text="test" onclick="AA();"></asp:Button>
 或
 <input type="button" value="test" name="bttons" onclick="AA();">

Answer 2

<script language="javascript">
<!--
function showdrop()
{
if(document.all.DropDownList1.style.display=="none")
{
document.all.DropDownList1.style.display="inline";
}
else
{
document.all.DropDownList1.style.display="none";
}}
//-->
</script>