nested repeater show data that matches parent repeater - asp.net

Question

I am using a repeater to build a custom table. However, I can't figure out how to make the table show subtotal if the next rows tour does not match the previous rows.
Something similar to that.
row1 tour1
row2 tour 1
tour1 subtotal
row3 tour2
row4 tour2
subtotal
total
<asp:Repeater ID="ParentRepeater" runat="server" DataSourceID="SqlDataSource1">
<HeaderTemplate>
<table border="1">
<tr>
<th>TOUR</th>
<th>THEME</th>
<th>ROUTE</th>
<th>DEPT</th>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td><%#Container.DataItem("tour")%></td>
<td align="center"><%#Container.DataItem("theme")%></td>
<td align="right"><%#Container.DataItem("route")%></td>
<td align="right"><%#Container.DataItem("dep7")%></td>
<asp:Repeater ID="ChildRepeater" runat="server"
DataSourceID="SqlDataSource2">
<HeaderTemplate>
<table border="1">
<tr>
<th>BOOKNO</th>
<th>PARTY</th>
<th>TOUR</th>
<th>THEME</th>
<th>ROUTE</th>
<th>DEPT</th>
<th>HOME</th>
<th>USERID</th>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td align="center"><%#Container.DataItem("bookno") %></td>
<td><%#Container.DataItem("party")%></td>
<td><%#Container.DataItem("tour")%></td>
<td align="center"><%#Container.DataItem("theme")%></td>
<td align="right"><%#Container.DataItem("route")%></td>
<td align="right"><%#Container.DataItem("dep7")%></td>
<td align="right"><%#Container.DataItem("home")%></td>
<td align="right"><%#Container.DataItem("userid")%></td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
code behind
Protected Sub ItemBound(ByVal sender As Object, ByVal args As RepeaterItemEventArgs)
If args.Item.ItemType = ListItemType.Item Then
Dim childRepeater As Repeater = DirectCast(args.Item.FindControl("ChildRepeater"), Repeater)
childRepeater.DataSource = SqlDataSource2
childRepeater.DataBind()
End If
End Sub
but this shows all the data in the nested repeater not the ones that match the parentrepeater fields
for example tour,theme,dep7 should match in the child repeater

Answer 1

First, add 2 class fields:
private int _subTotal; // Not sure what you're summing but you
// wrote subtotal in your pseudo-output
private int _lastTourId;
Reset these field before you databind your repeater:
_subTotal = 0;
_lastTourId = -1;
TourRepeater.DataBind();
The create a single level Repeater:
<asp:Repeater ID="TourRepeater" ...>
<HeaderTemplate>...<>
<ItemTemplate>
<tr>
Some columns with your tour data
</tr>
<PlaceHolder ID="SubTotalRow" ... />
</ItemTemplate>
<FooterTemplate>
<PlaceHolder ID="SubTotalRow" ... />
</FooterTemplate>
</asp:Repeater>
Bind this Repeater directly to your tour data, then do this in your OnItemDataBound event handler (I'll have to go for c#):
void RepeaterItemDataBound(object source, RepeaterItemEventArgs e)
{
if (
e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem // think you forgot this
)
{
var tour = e.Item.DataItem as Tour;
if (tour != null)
{
if (_lastTourId == -1) { _lastTourId == tour.TourId; } // To avoid subtotal row before first tour
if (tour.TourId != _lastTourId) // This is a new tour so insert a subtotal row for the previous tour
{
var subTotalRow = e.Item.FindControl("SubTotalRow") as PlaceHolder;
if (subTotalRow != null)
{
RenderSummaryRow(subTotalRow, _subTotal);
}
_subTotal = tour.SomeValueYouWantToAddToSubTotal;
}
else
{
_subTotal += tour.SomValueYouWantToAddToSubTotal;
}
_lastTourId = tour.TourId;
}
}
else if (e.Item.ItemType == ListItemType.Footer)
{
var subTotalRow = e.Item.FindControl("SummaryRow") as PlaceHolder;
if (summaryTotalRow != null)
{
RenderSummaryRow(subTotalRow, _subTotal);
}
}
}
private void RenderSummaryRow(PlaceHolder placeHolder, int subTotal)
{
// create subtotal row manually by either creating TableRow + TableCells and adding them to a placeholder, or
// just add a literal and create your markup manually as innerHtml. Put your _subtotal value in where you want
}
An alternative method is to retrieve your tour data into a DataTable, and retrieve the data WITH ROLLUP etc which will create summary rows automagically. There's several tutorials about this around the web, but I couldn't find the great one I used before I switched to MVC.