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Server-side events when selection changes?
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This is a migrated thread and some comments may be shown as answers.
Wayne
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Wayne asked on 07 Jun 2016, 02:08 PM
I have a rotator control that has a list of periods bound do it (think like a Category).  When I click the button to move to a new selection, I want a grid to update with the information for that period (e.g. grab the ID of the selected period, and query for it).  There doesn't seem to be a way to do this server-side though, only on the client.  Is my only recourse to use Ajax to pull the data and refresh the grid when something changes in the RadRotator?

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Wayne
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answered on 07 Jun 2016, 02:29 PM
Let me clarify I mean when the buttons to switch the visible item in the rotator is clicked, not the item inside (it's just a label).
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Vessy
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answered on 10 Jun 2016, 02:38 PM
Hi Wayne,

If I understand your requirements properly you want to update the content of a Grid when the prev/next button of the Rotator is clicked. if so, I am afraid that the scrolling of the items of the Rotator is done on the client, thus you will need to initiate the update of the Grid client-side. A possible way to implement this is to assign a handler to the Rotator's ClientItemShown event and make an AJAX request from it.

For example, you can use a similar logic:
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="RadAjaxManager1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="RadGrid1" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManager>
 
<telerik:RadRotator ID="RadRotator1" runat="server" Width="300px" RotatorType="Buttons" ScrollDuration="500" OnClientItemShown="OnClientItemShown">
    <ItemTemplate>
        <div class="RotatorItem" style="width: 300px">
            <h2>
                <asp:Label ID="lblTitle" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "title") %>'></asp:Label></h2>
            <div>
                <asp:Label ID="lblShortDesc" Text='<%# DataBinder.Eval(Container.DataItem, "desc")%>' runat="server"></asp:Label>
            </div>
        </div>
    </ItemTemplate>
</telerik:RadRotator>
 
<telerik:RadGrid ID="RadGrid1" runat="server">
</telerik:RadGrid>
<script type="text/javascript">
    function OnClientItemShown(sender, eventArgs) {
        console.log(1);
        //you can pass the clicked item index as an argument of ajaxRequest();
        $find("RadAjaxManager1").ajaxRequest(eventArgs.get_item().get_index());
    }
</script>
protected void Page_Load(object sender, EventArgs e)
{
    RadRotator1.DataSource = GetData();
    RadRotator1.DataBind();
}
 
private DataTable GetData()
{
    DataTable dt = new DataTable();
    dt.Columns.Add("title", typeof(string));
    dt.Columns.Add("desc", typeof(string));
    dt.Rows.Add("T0", "AAA");
    dt.Rows.Add("T1", "BBB");
    dt.Rows.Add("T2", "CCC");
    return dt;
}
 
protected void RadAjaxManager1_AjaxRequest(object sender, AjaxRequestEventArgs e)
{
   //your logic here
     string
index = e.Argument;
    RadGrid1.DataSource = new string[] { index, index, index, index, index, index, index };
    RadGrid1.DataBind();
}


I hope this helps.

Regards,
Vessy
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Wayne
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Vessy
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