Insus.NET近段時間應朋友的要求，寫一個GridView多層嵌套和折疊與展開。這個功能的GridView多層嵌套沒有問題，因為已經做了無限次數，但是折疊與展開的功能，卻花上不少時間(網上找資料)，雖找到資料可參考，還是了解明它，並修改適合自己程序使用。效果如下：
站點中多個頁面使用，因此Insus.NET把它寫在一個用戶自定義控件ASCX上。
復制代碼 代碼如下:
InsusMenu.ascx
<%@ Control Language="VB" AutoEventWireup="false" CodeFile="InsusMenu.ascx.vb" Inherits="AscxControls_InsusMenu" %>
<!--折疊與展開的Javascript部分-->
<script type="text/javascript" language="javascript">
function ShowHidde(sid, evt) {
evt = evt || window.event;
var target = evt.target || evt.srcElement;
var objDiv = document.getElementById("div" + sid);
objDiv.style.display = objDiv.style.display == "none" ? "block" : "none";
target.title = objDiv.style.display == "none" ? "Show" : "Hide";
var imgid = 'img' + sid;
document.getElementById(imgid).src = objDiv.style.display == "none" ? "Image/+.gif" : "Image/-.gif";
}
</script>
<!--第一層-->
<asp:GridView ID="GridViewYear" runat="server" Width="100%" AutoGenerateColumns="False"
OnRowDataBound="GridViewYear_RowDataBound" ShowHeader="false" BorderWidth="0">
<Columns>
<asp:TemplateField>
<ItemStyle BorderWidth="0" Height="25" />
<ItemTemplate>
<!--下在這個綁定Eval("Year")，是為獲取唯一ID，如果你的記錄有一個主鍵的話，可以綁定主鍵的字段名-->
<img id='img<%# Eval("Year")%>' style="border: 0px;" src="Image/+.gif" onclick="ShowHidde('<%#Eval("Year")%>',event)" />
<!--下面這個綁定，是第一層顯示的文字-->
<%# Eval("Year") & "年"%>
<div id='div<%# Eval("Year")%>' style="display: none;">
<!--第二層-->
<asp:GridView ID="GridViewMonth" runat="server" OnRowDataBound="GridViewMonth_RowDataBound" Width="100%" AutoGenerateColumns="False" ShowHeader="False" BorderWidth="0">
<Columns>
<asp:TemplateField>
<ItemStyle BorderWidth="0" Height="25" />
<ItemTemplate>
<!--這部分的解釋，可參考上面。-->
<img id='img<%# Eval("Month")%>' style="border: 0px; padding-left: 20px;" src="Image/+.gif" onclick="ShowHidde('<%#Eval("Month")%>',event)" />
<%# Eval("Month") & "月"%>
<div id='div<%# Eval("Month")%>' style="display: none;">
<!--第三層-->
<asp:GridView ID="GridViewVideoFile" runat="server" Width="100%" AutoGenerateColumns="False"
ShowHeader="False" BorderWidth="0">
<Columns>
<asp:TemplateField>
<ItemStyle BorderWidth="0" Height="25" />
<ItemTemplate>
<img style="border: 0px; padding-left: 40px; padding-right:5px; width: 16px; height: 16px; vertical-align: middle;" src="Image/m_file.png" /><asp:HyperLink ID="HyperLinkPlayer" runat="server" NavigateUrl='<%# "~/VideoPlayer.aspx?videokey=" & Eval("VideoLibrary_nbr")%>' Text='<%# Eval("OldFileName").Substring(0, Eval("OldFileName").LastIndexOf("."))%>' Target="_blank"></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
復制代碼 代碼如下:
InsusMenu.ascx.vb
Imports System.Data
Imports Insus.NET
Partial Class AscxControls_InsusMenu
Inherits System.Web.UI.UserControl
'宣告實例
Dim objVideoLibrary As New VideoLibrary()
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
If Not IsPostBack Then
Data_Binding()
End If
End Sub
Private Sub Data_Binding()
'從數據庫獲取數據，綁定在第一層的GridView
Me.GridViewYear.DataSource = objVideoLibrary.GetYear()
Me.GridViewYear.DataBind()
End Sub
'數據綁定在第二層的GridView
Protected Sub GridViewYear_RowDataBound(sender As Object, e As GridViewRowEventArgs)
Dim dvr As DataRowView = DirectCast(e.Row.DataItem, DataRowView)
If e.Row.RowType = DataControlRowType.DataRow Then
If e.Row.FindControl("GridViewMonth") IsNot Nothing Then
Dim Gv As GridView = DirectCast(e.Row.FindControl("GridViewMonth"), GridView)
objVideoLibrary.Year = ConvertData.ToSmallInt(dvr("Year"))
Gv.DataSource = objVideoLibrary.GetMonthByYear()
Gv.DataBind()
End If
End If
End Sub
'數據綁定在第三層的GridView
Protected Sub GridViewMonth_RowDataBound(sender As Object, e As GridViewRowEventArgs)
Dim dvr As DataRowView = DirectCast(e.Row.DataItem, DataRowView)
If e.Row.RowType = DataControlRowType.DataRow Then
If e.Row.FindControl("GridViewVideoFile") IsNot Nothing Then
Dim Gv As GridView = DirectCast(e.Row.FindControl("GridViewVideoFile"), GridView)
objVideoLibrary.Year = ConvertData.ToSmallInt(dvr("Year"))
objVideoLibrary.Month = ConvertData.ToTinyInt(dvr("Month"))
Gv.DataSource = objVideoLibrary.GetByYearAndMonth()
Gv.DataBind()
End If
End If
End Sub
End Class
