利用js做的下拉菜单

#nav {

  list-style-type: none; 

  font-size:14px;

}



#nav a {

 display: block; 

 text-align:center;

}



#nav a:link  {

  text-decoration:none;

}

#nav a:visited  {

 text-decoration:none;

}

#nav a:hover  {

 text-decoration:none;

}



#nav li {

 float: left; 

}

#nav li a:hover{

}

#nav li ul 

{

    top:149px;

    list-style-type:none;text-align:left;    

    left: -999em; width: 180px; position: absolute; 

}

#nav li ul li{

    float: left; 

    width: 180px;

    background: #5AA428; 

}





#nav li ul a{

    display: block;

    width: 150px;

    text-align:left;

    padding-left:10px;

}



#nav li ul a:link  {

    text-decoration:none;

}

#nav li ul a:visited  {

    text-decoration:none;

}

#nav li ul a:hover  {

    text-decoration:none;font-weight:normal;

    background:#F6F6F6;

}



#nav li:hover ul {

    left: auto;

}

#nav li.sfhover ul {

    left: auto;

}

#content {

    clear: left; 

}



</style>

    <script type="text/javascript"><!--        //--><![CDATA[//><!--

        function menuFix() {

            var sfEls = document.getElementById("nav").getElementsByTagName("li");

            for (var i = 0; i < sfEls.length; i++) {

                sfEls[i].onmouseover = function () {

                    this.className += (this.className.length > 0 ? " " : "") + "sfhover";

                }

                sfEls[i].onMouseDown = function () {

                    this.className += (this.className.length > 0 ? " " : "") + "sfhover";

                }

                sfEls[i].onMouseUp = function () {

                    this.className += (this.className.length > 0 ? " " : "") + "sfhover";

                }

                sfEls[i].onmouseout = function () {

                    this.className = this.className.replace(new RegExp("( ?|^)sfhover\\b"),



"");

                }

            }

        }

        window.onload = menuFix;



        //--><!]]></script>

 

静态menu 前台code：

<ul id="nav">

 <li ><a  href="/Default.aspx"><span>Home</span></a></li>

  <li ><a  href="/Account/Default.aspx"><span>My Account</span></a>

    <ul>

    <li><a href="/Account/Default.aspx">Default</a></li>

    <li><a href="/Account/ChangePassword.aspx">ChangePassword</a></li>

   </ul></li>

    <li><a href="/PMail/Default.aspx">Private Mail</a>

        <ul>

            <li><a href="/PMail/SendMail.aspx">Send Mail</a></li>

            <li><a href="/PMail/Inbox.aspx">InBox</a></li>

            <li><a href="/PMail/SendBox.aspx">Sendbox</a></li>

        </ul>

    </li>

</ul>  

动态menu 前台code

<asp:Repeater ID="rptTopMenu" runat="server" 
    onitemdatabound="rptTopMenu_ItemDataBound">
    <HeaderTemplate>
        <ul id="nav">
    </HeaderTemplate>
    <ItemTemplate>
        <li ><a  href="<%# Eval("MenuUrl") %>"><span><%# Eval("MenuTitle") %></span></a>
            <asp:Repeater ID="rptSubMenu" runat="server">
                <HeaderTemplate>
                    <ul>
                </HeaderTemplate>
                <ItemTemplate>
                    <li><a href="<%# Eval("MenuUrl") %>"><%# Eval("MenuTitle") %></a></li>
                </ItemTemplate>
                <FooterTemplate>
                    </ul>
                </FooterTemplate>
            </asp:Repeater>
        </li>
    </ItemTemplate>
    <FooterTemplate>
        </ul>
    </FooterTemplate> 

</ asp:Repeater>

 动态menu 后台code

/// <summary>
        /// Load Top Menu.
        /// </summary>
        private void LoadTopMenu()
        {
            _MemberRoles = Roles.GetRolesForUser(UserName);

            MemberService memberService = new MemberService();
            ReadOnlyCollection<GoldnexMenu> goldnexMenu = memberService.LoadTopMenuList(_MemberRoles);

            List<GoldnexMenu> list = new List<GoldnexMenu>();

            for (int i = 0; i < goldnexMenu.Count; i++)
            {
                string[] allowUsers = goldnexMenu[i].AllowUsers.Split(',');

                if (allowUsers.Contains("*"))
                {
                    list.Add(goldnexMenu[i]);
                }
                else
                {
                    for (int j = 0; j < _MemberRoles.Length; j++)
                    {
                        if (allowUsers.Contains(_MemberRoles[j]))
                        {
                            list.Add(goldnexMenu[i]);
                            break;
                        }
                    }
                }
                                
            }
            rptTopMenu.DataSource = list;
            rptTopMenu.DataBind();
        }

        /// <summary>
        /// Current UserName
        /// </summary>
        public string UserName
        {
            get 
            {
                return _UserName;
            }
            set
            {
                _UserName = value;
            }
        }

        /// <summary>
        /// bind sub menu
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void rptTopMenu_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                Repeater rptSubMenu = (Repeater)e.Item.FindControl("rptSubMenu");
                GoldnexMenu goldnexMenu = (GoldnexMenu)e.Item.DataItem;

                int topID = goldnexMenu.MenuID;

                MemberService memberService = new MemberService();
                ReadOnlyCollection<GoldnexMenu> subMenuList = memberService.LoadSubMenuList(_MemberRoles,topID);
                rptSubMenu.DataSource = subMenuList;
                rptSubMenu.DataBind();
            }

         }