Coolite Toolkit学习笔记五：常用控件Menu和MenuPanel

 Coolite Toolkit里的Menu控件和其他的.NET Web控件不一样，如果只是设计好了Menu或是通过程序初始化菜单项，菜单是不会呈现在界面上的，因为Coolite Toolkit规定Menu控件需要一个容器来做依托，而这个让Menu依托的控件就是MenuPanel，下面拖拽出的MenuPanel控件所生成的html编码：

Code
<ext:MenuPanel ID="MenuPanel1" runat="server" Height="300" Title="Menu" Width="185">
    <Menu>
        <Items>
            <ext:MenuItem ID="MenuItem1" runat="server" Text="Item1">
                <Menu>
                    <ext:Menu ID="Menu2" runat="server">
                        <Items>
                            <ext:MenuItem ID="MenuItem2" runat="server" Text="SubItem1">
                            </ext:MenuItem>
                            <ext:MenuItem ID="MenuItem3" runat="server" Text="SubItem2">
                            </ext:MenuItem>
                        </Items>
                    </ext:Menu>
                </Menu>
            </ext:MenuItem>
            <ext:MenuItem ID="MenuItem4" runat="server" Text="Item2">
            </ext:MenuItem>
            <ext:MenuItem ID="MenuItem5" runat="server" Text="Item3">
            </ext:MenuItem>
            <ext:MenuItem ID="MenuItem6" runat="server" Text="Item4">
            </ext:MenuItem>
        </Items>
    </Menu>
</ext:MenuPanel>

      从上面可以明显的看出，MenuPanel里可以放置菜单项(MenuItem)，如果有子菜单，那么子菜单则对应于一个Menu控件，子菜单里的菜单项则又是通过菜单项(MenuItem)来体现。如下是我修改后的一个菜单html编码：

< ext:MenuPanel  runat ="server"  Height ="300"  Title ="帐套管理"  Width ="185" >
     < Menu  runat ="server" >
         < Items >
             < ext:MenuItem  runat ="server"  Text ="新增帐套"  Icon ="Add" >
                 < Listeners >
                     < Click  Handler ="JavaScript:window.location.href='#';"   />
                 </ Listeners >
             </ ext:MenuItem >
             < ext:MenuItem  runat ="server"  Text ="维护帐套"  Icon ="Cmy" />
             < ext:MenuItem  runat ="server"  Text ="帐套管理"  Icon ="Database" >
                 < Menu >
                     < ext:Menu  runat ="server" >
                         < Items >
                             < ext:MenuItem   runat ="server"  Text ="备份帐套"  Icon ="DatabaseSave" >
                                 < Listeners >
                                     < Click  Handler ="JavaScript:window.open('#');"   />
                                 </ Listeners >
                             </ ext:MenuItem >
                             < ext:MenuItem  runat ="server"  Text ="恢复帐套"  Icon ="DatabaseGo" >
                                 < Listeners >
                                     < Click  Handler ="JavaScript:window.open('#');"   />
                                 </ Listeners >
                             </ ext:MenuItem >
                         </ Items >
                     </ ext:Menu >
                 </ Menu >
             </ ext:MenuItem >
         </ Items >
         < Listeners >
             < ItemClick  Fn ="onItemClick"   />
         </ Listeners >
     </ Menu >
</ ext:MenuPanel >
< script  type ="text/javascript" >
     function  onItemClick(menuItem) {
        Ext.Msg.alert( " ★操作提示★ " ,  " 当前点击项内容： "   +  menuItem.text);
    }
  </ script >

                        

      像Tree、Menu等类似的控件，我个人认为主要就是弄清楚他们内部的层次结构，不管是通过界面设计还是通过直接Code创建他们，最终得到的结果都是一样，如上菜单显示效果，同样可以通过如下程序代码来创建：

protected   void  Page_Load( object  sender, EventArgs e)
{
     if  ( ! IsPostBack)
    {
        CreateMenuPanel();
    }
}

private   void  CreateMenuPanel()
{
    MenuPanel menuPanel  =   new  MenuPanel();
    menuPanel.Title  =   " 帐套管理 " ;
    menuPanel.Width  =   new  Unit( 180 );

    Coolite.Ext.Web.MenuItem addAccount  =   new  Coolite.Ext.Web.MenuItem( " 新增帐套 " );
    addAccount.Icon  =  Icon.Add;
    addAccount.Listeners.Click.Handler  =   " JavaScript:window.location.href='#'; " ;
    
    Coolite.Ext.Web.MenuItem whAccount  =   new  Coolite.Ext.Web.MenuItem( " 维护帐套 " );
    whAccount.Icon = Icon.Cmy;

    Coolite.Ext.Web.MenuItem accountManage  =   new  Coolite.Ext.Web.MenuItem( " 帐套管理 " );
    accountManage.Icon  =  Icon.Database;

    Coolite.Ext.Web.Menu subMenu  =   new  Coolite.Ext.Web.Menu();

    Coolite.Ext.Web.MenuItem backMenuItem  =   new  Coolite.Ext.Web.MenuItem( " 备份帐套 " );
    backMenuItem.Icon  =  Icon.DatabaseSave;
    backMenuItem.Listeners.Click.Handler  =   " JavaScript:window.open('#') " ;
    subMenu.Items.Add(backMenuItem);

    Coolite.Ext.Web.MenuItem reMenuItem  =   new  Coolite.Ext.Web.MenuItem( " 恢复帐套 " );
    reMenuItem.Icon  =  Icon.DatabaseGo;
    reMenuItem.Listeners.Click.Handler  =   " JavaScript:window.open('#') " ;
    subMenu.Items.Add(reMenuItem);

    accountManage.Menu.Add(subMenu);

    menuPanel.Menu.Items.Add(addAccount);
    menuPanel.Menu.Items.Add(whAccount);
    menuPanel.Menu.Items.Add(accountManage);
    menuPanel.Menu.Listeners.ItemClick.Fn  =   " onItemClick " ;

    accountDiv.Controls.Add(menuPanel);
}

      本笔记暂时记录于此，更多高级应用需要大家去挖掘，欢迎各位朋友留下自己的看法和使用心得。