This is a migrated thread and some comments may be shown as answers.
RadRotator Not Refreshing
3 Answers 2 Views
This is a migrated thread and some comments may be shown as answers.
Rob
Top achievements
Rank 1
Rob asked on 23 Jun 2016, 07:16 PM

Telerik Support,

I have one page that has a RadGrid with a GridHyperLinkColumn.  When the user clicks the hyperlink, a second page with a RadRotator is opened up in a new browser window.  Let's say I have 2 rows of data in the grid.  If I click on the first link, the image displays as expected in the RadRotator.  Next if I click on the second hyperlink, it should set no images for the RadRotator, but instead the RadRotator's datasource seems to somehow be cached and reloads the initially loaded image. 

Vice versa creates a similar issue.  Stop running the app and restart it.  Click on the second hyperlink first and the RadRotator is displayed with no image.  Next click on the first hyperlink and still no image is loaded.  The expected result no matter what order is selected is for the first hyperlink to display an image in the RadRotator and the second hyperlink should not display an image in the RadRotator.

Here is a video reproducing the issue both ways with a simple example:  http://screencast.com/t/2batqcc8

Here is the code for page 1

ImageList.aspx

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="ImageList.aspx.vb" Inherits="TestBed.ImageList" %>
 
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
 
<!DOCTYPE html>
 
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>
            <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server"></telerik:RadAjaxManager>
            <telerik:RadGrid ID="RadGrid1" runat="server" Height="100%" Width="100%" AutoGenerateColumns="false">
                <MasterTableView>
                    <Columns>
                        <telerik:GridHyperLinkColumn DataTextField="Text" HeaderText="Image" Target="_blank" UniqueName="Text"
                            DataNavigateUrlFormatString="~\ImageViewer.aspx?image={0}" DataNavigateUrlFields="Image">
                        </telerik:GridHyperLinkColumn>
                    </Columns>
                </MasterTableView>
            </telerik:RadGrid>
        </div>
    </form>
</body>
</html>

ImageList.aspx.vb

Public Class ImageList
    Inherits System.Web.UI.Page
 
    Private Sub RadGrid1_NeedDataSource(sender As Object, e As Telerik.Web.UI.GridNeedDataSourceEventArgs) Handles RadGrid1.NeedDataSource
        Dim dt As New DataTable
        Dim dr As DataRow
        Dim col As New DataColumn("Image", GetType(Boolean))
        dt.Columns.Add(col)
        col = New DataColumn("Text", GetType(String))
        dt.Columns.Add(col)
        dr = dt.NewRow
        dr("Image") = True
        dr("Text") = "Image1"
        dt.Rows.Add(dr)
        dr = dt.NewRow
        dr("Image") = False
        dr("Text") = "Image2"
        dt.Rows.Add(dr)
        RadGrid1.DataSource = dt
    End Sub
End Class

ImageViewer.aspx

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="ImageViewer.aspx.vb" Inherits="TestBed.ImageViewer" %>
 
<!DOCTYPE html>
 
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>
            <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server"></telerik:RadAjaxManager>
                <telerik:RadRotator ID="RadRotator1" runat="server" RenderMode="Lightweight" DataSourceID="XmlDataSource1"
                    Width="215px" Height="100px" ItemHeight="32px" FrameDuration="2000" ScrollDuration="2000" RotatorType="Buttons">                   
                    <ItemTemplate>
                        <div class="itemTemplate">
                            <img src="<%# XPath("SmallURL") %>" alt="" style="height: 100px; width: 100px;" onclick="SetImage('<%# XPath("LargeURL") %>');" />
                        </div>
                    </ItemTemplate>
                    <ControlButtons LeftButtonID="img_left" RightButtonID="img_right"></ControlButtons>
                </telerik:RadRotator>
                <asp:XmlDataSource ID="XmlDataSource1" runat="server"></asp:XmlDataSource>
        </div>
    </form>
</body>
</html>

ImageViewer.aspx.vb

Public Class ImageViewer
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim image As Boolean = CBool(Me.Request.QueryString("image"))
        If image Then
            XmlDataSource1.Data = "<Data><DataItem><SmallURL>/Image1.jpg</SmallURL><LargeURL>/Image1.jpg</LargeURL></DataItem></Data>"
        Else
            XmlDataSource1.Data = "<Data><DataItem><SmallURL></SmallURL><LargeURL></LargeURL></DataItem></Data>"
        End If
    End Sub
 
End Class

Please help.

Thanks,

Rob

 

3 Answers, 1 is accepted

Sort by
0
Rob
Top achievements
Rank 1
answered on 27 Jun 2016, 04:55 PM
I could really use some assistance with this issue.  Thank you.
0
Accepted
Slav
Telerik team
answered on 28 Jun 2016, 05:53 PM
Hello Rob,

The examined behavior is a result of the way XmlDataSource caches its data and it is not related to RadRotator.

By default the XmlDataSource will cache its data indefinitely, so you can either turn it of by setting its property EnableCaching to false or by setting CacheDuration and the rotator control will be configured as expected. You can find more information in the following article: https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.xmldatasource.enablecaching(v=vs.110).aspx

Regards,
Slav
Telerik
Do you need help with upgrading your ASP.NET AJAX, WPF or WinForms projects? Check the Telerik API Analyzer and share your thoughts.
0
Rob
Top achievements
Rank 1
answered on 28 Jun 2016, 06:18 PM
Thank you so much!  That fixed my problem.
Asked by
Rob
Top achievements
Rank 1
Answers by
Rob
Top achievements
Rank 1
Slav
Telerik team
Share this question
or