RadGrid.Rebind() not firing NeedDataSource

[Jason Maronge]

Does not seem like RadGrid.Rebind() is firing the NeedDataSource if NeedDataSource has already been executed on postback.  I am using a context menu on a grid row to duplicate the row but when I call the grid.Rebind() on the RadMenu_ItemClick it does not fire the NeedDataSource to rebind the grid. Has anyone else seen this?  I am using the Q3 2008.

Thanks,

Jason

 

[Yavor]

Hello Jason,

I tested the setup which you mentioned, and the control behaved as expected.
Attached to this message, you will find the code, which I used for testing.
Take a look at it and let me know how it goes and if any other questions arise.

Greetings,
Yavor
the Telerik team

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[Mattias]

Hi,
I have the same problem, rebind does not firing needdatasource.
It's probably something simple I missed, can you see what?

 <asp:Panel ID="panelFilter" runat="server" CssClass="Filters" DefaultButton="buttonFilter">
    <table>
        <tr>
            <td>
                <asp:TextBox ID="textBoxFilterSearch" runat="server" CssClass="medium"></asp:TextBox>
            </td>
            <td>
                <asp:Button ID="buttonFilter" runat="server" Text="Sök" UseSubmitBehavior="true" OnClick="buttonFilterClick" />
            </td>
        </tr>
    </table>
</asp:Panel>

<asp:Panel ID="panelBusinessRegister" runat="server">
    <telerik:radgrid
        ID="radGridBusinessRegister"
        runat="server"
        allowpaging="True"
        allowsorting="True"
        autogeneratecolumns="False"
        gridlines="None"
        onneeddatasource="radGridBusinessRegisterNeedDataSource"
        Skin="SkyBlue">
        <HeaderContextMenu EnableTheming="True">
            <CollapseAnimation Duration="200" Type="OutQuint" />
        </HeaderContextMenu>
        <MasterTableView>
            <RowIndicatorColumn>
                <HeaderStyle Width="20px" />
            </RowIndicatorColumn>
            <ExpandCollapseColumn>
                <HeaderStyle Width="20px" />
            </ExpandCollapseColumn>
            <Columns>
                <telerik:GridBoundColumn UniqueName="Name" DataField="Name" HeaderText="Företag" />
                <telerik:GridBoundColumn UniqueName="Phone1" DataField="Phone1" HeaderText="Telefon" />
                <telerik:GridBoundColumn UniqueName="Email" DataField="Email" HeaderText="E-post" />
            </Columns>
        </MasterTableView>
        <FilterMenu EnableTheming="True">
            <CollapseAnimation Duration="200" Type="OutQuint" />
        </FilterMenu>
    </telerik:radgrid>

</asp:Panel>

    public partial class BusinessRegisterPage : System.Web.UI.UserControl
    {
        private BusinessRegisterCompanyService _companyService;
        public BusinessRegisterCompanyService CompanyService
        {
            get { return _companyService; }
            set { _companyService = value; }
        }

        public BusinessRegisterPage()
        {
            _companyService = new BusinessRegisterCompanyService();
        }


        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void radGridBusinessRegisterNeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
        {
            Response.Write("Needed datasource, textbox value: " + textBoxFilterSearch.Text.Trim());
            radGridBusinessRegister.DataSource = CompanyService.GetCompanies(PageInfo.CurrentSite, true, textBoxFilterSearch.Text.Trim());
        }

        protected void buttonFilterClick(object sender, EventArgs e)
        {
            Response.Write("Button clicked, textbox value: " + textBoxFilterSearch.Text.Trim());
            radGridBusinessRegister.Rebind();
        }
    }

The needdatasource just runs on page load, not when clicking the button.

[Mattias]

Hmm, it seems to work when setting datasource to null before rebind.
I cant remember I had to do that before!? Well, well, now it works! :)

protected void buttonFilterClick(object sender, EventArgs e)
{
     radGridBusinessRegister.DataSource = null;
     radGridBusinessRegister.Rebind();
}

[Michelle]

I had the same situation, calling Rebind() twice in a postback was not firing NeedDataSource for the second call.  This solution worked for me too (setting DataSource = null before second call to Rebind).  Thanks!

[Aaron Abdis]

v.2012.3.1205.40, and i have the same issue, with the same solution.
Setting the DataSource = Nothing before calling Rebind() fixes it.

[Al]

 I see the same issue in 2015 Q2 and the same fix solves the problem

[Viktor Tachev]

Hello,

Setting the DataSource property to null (Nothing) is required when the ViewState for RadGrid is disabled. Check out the following article that describes the approach in more detail:

• http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/performance/rebind-grid-with-enableviewstate-=-false

Regards,
Viktor Tachev
Telerik

[Al]

Hi Viktor,

I am pretty sure that my ViewState is not disabled, mine is a standard grid and I did not set/change the ViewState setting.

[Maria Ilieva]

Hi Al,

Can you please share your RadGrid markup as well as the related code behind so that we can revise them locally and isolate the root cause of the issue?

Regards,
Maria Ilieva
Telerik