Select all + persist selection + multipage

[Marnix Bouwman]

Hi I have this radgrid showing 10 items per page where I want to have a column with checkboxes.
When I check some checkboxes on page 1, I want to go to page 4 and select some more checkboxes.
And then go back to page 1 and the selected checkboxes should still be selected.
I have this working.

Now I want a select all checkbox which selects, well.... All records... I got it so far so it will select all records on the current page, but not on the other pages.

I've set it up like this:

<telerik:radgrid id="RadUsers" allowmultirowselection="true" showfooter="True" runat="server" showstatusbar="True" onneeddatasource="RadUsers_NeedDataSource" gridlines="None" allowpaging="True" pagesize="10" skin="Vista" allowfilteringbycolumn="True" autogeneratecolumns="False" >
    <mastertableview showfooter="True" datakeynames="UserID"  >
        <columns>
            <telerik:gridtemplatecolumn allowfiltering="false">
                <headertemplate>
                    <asp:checkbox id="headerChkbox" oncheckedchanged="ToggleSelectedState" autopostback="True" runat="server"></asp:checkbox>
                </headertemplate>
                <itemtemplate>
                    <asp:checkbox id="cbChecked" runat="server" autopostback="true" oncheckedchanged="OnCheckedChangedEvent" />
                </itemtemplate>
            </telerik:gridtemplatecolumn>
...

And:

        Private ReadOnly Property UsersChecked() As Hashtable
            Get
                Dim res As Object = ViewState("_cc")
                If (res Is Nothing) Then
                    res = New Hashtable
                    ViewState("_cc") = res
                End If
                Return CType(res, Hashtable)
            End Get
        End Property

....

        Protected Sub RadUsers_ItemDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles RadUsers.ItemDataBound
            If TypeOf e.Item Is GridDataItem Then
                Dim item As GridDataItem = CType(e.Item, GridDataItem)
                Dim box As CheckBox = CType(item.FindControl("cbChecked"), CheckBox)
                Dim isChecked As Object = Nothing

                isChecked = UsersChecked(item("UserID").Text)

                If Not (isChecked Is Nothing) Then
                    box.Checked = CType(isChecked, Boolean) = True
                End If
            End If
        End Sub


        Protected Sub ToggleSelectedState(ByVal sender As Object, ByVal e As EventArgs)
            Dim target As Hashtable = Nothing
            target = UsersChecked

            If (CType(sender, CheckBox)).Checked Then
                For Each dataItem As GridDataItem In RadUsers.MasterTableView.Items
                    CType(dataItem.FindControl("cbChecked"), CheckBox).Checked = True
                    'dataItem.Selected = True
                    target(dataItem("UserID").Text) = True
                Next
            Else
                For Each dataItem As GridDataItem In RadUsers.MasterTableView.Items
                    CType(dataItem.FindControl("cbChecked"), CheckBox).Checked = False
                    'dataItem.Selected = False
                    target(dataItem("UserID").Text) = Nothing
                Next
            End If
        End Sub


        Sub OnCheckedChangedEvent(ByVal sender As Object, ByVal e As System.EventArgs)
            Dim box As CheckBox = CType(sender, CheckBox)
            Dim item As GridDataItem = CType(box.NamingContainer, GridDataItem)
            Dim target As Hashtable = Nothing

            target = UsersChecked

            If box.Checked Then
                target(item("UserID").Text) = True
            Else
                target(item("UserID").Text) = Nothing
            End If
        End Sub

[Sebastian]

Hello Marnix,

You may consider the client-side approach with 'SelectAll' option in built-in GridClientSelectColumn demonstrated in this topic from the online documentation. Thus you should attain the desired result.

Best regards,
Sebastian
the Telerik team

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