PRM–pageLoaded事件

PRM–pageLoaded事件
•参数类型：PageLoadedEventArgs
–dataItems属性：获得服务器端注册的数据项
–panelsCreated属性：获得新建的UpdatePanel
–panelsUpdated属性：获得已经更新的UpdatePanel
•常用操作：
–（能够）获得服务器端注册的数据项
–（能够）执行服务器端注册的脚本

局部内容添加

<% @ Page Language = " C# "  MasterPageFile = " ~/Site.master "  AutoEventWireup = " true "  CodeFile = " 4_IncrementalContent.aspx.cs "  Inherits = " _4_IncrementalContent "  Title = " IncrementalContent "  EnableViewState = " false " %>
< asp:Content ID = " Content1 "  ContentPlaceHolderID = " ContentPlaceHolder1 "  Runat = " Server " >
     < strong > Comment: </ strong >< br  />< br  />
    
     < div id = " commentContainer " >
         < asp:UpdatePanel ID = " UpdatePanel1 "  runat = " server " >
             < ContentTemplate >
                 < asp:Repeater ID = " Repeater1 "  runat = " server " >
                     < ItemTemplate >
                         <% # (Container.DataItem  as  Comment).Content  %>< br  />
                         < i ><% # (Container.DataItem  as  Comment).Time  %></ i >
                         < hr  />
                     </ ItemTemplate >
                 </ asp:Repeater >
             </ ContentTemplate >
             < Triggers >
                 < asp:AsyncPostBackTrigger ControlID = " Button1 "   />
             </ Triggers >
         </ asp:UpdatePanel >
     </ div >
    
     < br  />
     < asp:TextBox ID = " TextBox1 "  runat = " server " ></ asp:TextBox >< br  />
     < asp:Button ID = " Button1 "  runat = " server "  Text = " Add Comment "  OnClick = " Button1_Click "   />

     < script language = " javascript "  type = " text/javascript " >
        Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(
            function(sender, e)
            {
                var upId  =   " <%= this.UpdatePanel1.ClientID %> " ;
                var refreshedPanels  =  e.get_panelsUpdated();
                
                 for  (var i  =   0 ; i  <  refreshedPanels.length; i ++ )
                {
                     if  (refreshedPanels[i].id  ==  upId)
                    {
                        refreshedPanels[i].id  =  upId  +  Math.floor( 9999   *  Math.random());
                        var div  =  document.createElement( " div " );
                        div.id  =  upId;
                        $ get ( " commentContainer " ).appendChild(div);
                         return ;
                    }
                }
            });
     </ script >
</ asp:Content >

cs

     private   static  List < Comment >  Comments;

     protected   void  Page_Load( object  sender, EventArgs e)
    {
         if  ( ! this .IsPostBack)
        {
             //  在第一次打开页面时清空所有Comments。
             //  古怪的用法，仅在这个示例时这么用。
            Comments  =   new  List < Comment > ();
             this .BindComments();
        }
    }

     private   void  BindComments()
    {
         this .Repeater1.DataSource  =  Comments;
         this .Repeater1.DataBind();
    }

     protected   void  Button1_Click( object  sender, EventArgs e)
    {
        Comment comment  =   new  Comment();
        comment.Content  =   this .TextBox1.Text;
        comment.Time  =  DateTime.Now;

         //  Comments.Add(comment);
         this .Repeater1.DataSource  =   new  Comment[] { comment };
         //  this.BindComments();
         this .Repeater1.DataBind();
    }