Question

I have added a checkbox to the rows of a gridview that when clicked will expand a panel in the row. My gridview needs to use paging, so I am saving in a session variable the state of the current page before the page change. When the user clicks back to a page I am repopulating the checkboxes, but this does not expand the panels. Is there away to expand the panels from the code behind?

<asp:CheckBox runat="server" Text="Order Updated Records" ID="cbUR" Visible='<%# !DBNull.Value.Equals(Eval("AnyBox"))%>' /> 
<asp:CollapsiblePanelExtender ID="cInst" runat="server" TargetControlID="inst" Collapsed="true" AutoExpand="true" AutoCollapse="false" ExpandControlID="cbUR" CollapseControlID="cbUR" />
<asp:Panel ID="Inst" runat="server">
    <asp:TextBox runat="server" ID="txtInst" TextMode="MultiLine" Width="200" />
</asp:panel>

I tried adding the panel, textbox and panel extender from the code, but could not get it to work. I read on a different post that the whole gridview would need to load from the code for this to work.

I would love to use something like

<asp:CollapsiblePanelExtender ID="cInst" runat="server" TargetControlID="inst" Collapsed='<%#!Convert.ToBoolean(rowItems[index].ToString()) %>' />

Would it be better not use the CollapsiblePanelExtender and find a different way to show the panels?

Answer 1

You could try adding a public/protected method:

public bool IsCollapsed(object rowId) {
    //get row by ID here and return true if collapsed
    return ....
}

that would return a value for a row that needs to be expanded or collapsed.

and use it like:

Collapsed='<%# IsCollapsed(Eval("RowId")) %>'

where RowId is a property that represents the ID of the item.