SlideShow method error [Answered]RSS

• • Reply
  dlchase

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  SlideShow method error

  May 11, 2018 06:34 PM|dlchase|LINK

  I am trying to use the SlideShowExtender in toolkit and I get the following error.

  An unhandled exception occurred:

  Message: Unknown web method GetSlides.

  Parameter name: methodName

   

   Stack Trace:

     at System.Web.Script.Services.WebServiceData.GetMethodData(String methodName)

     at System.Web.Script.Services.RestHandler.CreateHandler(WebServiceData webServiceData, String methodName)

     at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)

     at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

     at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)

     at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

  Below is my markup and webmethod 

                  <asp:Image ID="ImgSlide" runat="server" Height="300" Width="300" />
  
                  <ajaxToolkit:SlideShowExtender ID="SlideShowExtender1" runat="server" 
                      TargetControlID="ImgSlide" 
                      SlideShowServiceMethod="GetSlides" 
                      SlideShowServicePath="~/WebServiceImages.asmx" 
                      AutoPlay="True" 
                      PlayInterval="1000" />
  
  Imports System.IO
  Imports AjaxControlToolkit
  Imports System.Web.Services
  
  ' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
  <System.Web.Script.Services.ScriptService()>
  <WebService(Namespace:="http://tempuri.org/")>
  <WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)>
  <Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()>
  Public Class WebServiceImages
      Inherits System.Web.Services.WebService
  
      <WebMethod()>
      Public Shared Function GetSlides() As Slide()
          Dim slides As New List(Of Slide)()
          Dim sPath As String = HttpContext.Current.Server.MapPath("~/ketodocs/slides/")
          If sPath.EndsWith("\") Then
              sPath = sPath.Remove(sPath.Length - 1)
          End If
          Dim pathUri As New Uri(sPath, UriKind.Absolute)
          Dim files As String() = Directory.GetFiles(sPath)
          For Each file As String In files
              Dim filePathUri As New Uri(file, UriKind.Absolute)
              slides.Add(New Slide() With {
                .Name = Path.GetFileNameWithoutExtension(file),
                .Description = Path.GetFileNameWithoutExtension(file) + " Description.",
                .ImagePath = pathUri.MakeRelativeUri(filePathUri).ToString()
          })
          Next
          Return slides.ToArray()
      End Function
  
  End Class

  DavidInBD
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  mgebhard

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  Re: SlideShow method error

  May 11, 2018 07:06 PM|mgebhard|LINK

  Removed "Shared" from the web method declaration.  ASMX uses instance methods unlike web method in an ASPX page.

• • Reply
  dlchase

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  Re: SlideShow method error

  May 11, 2018 07:56 PM|dlchase|LINK

  That ALMOST worked.  The error went away but the image returned was placed after the </form> tag with style="display=none;"  when using using F12 developer tools.

  Can you see anything that would cause that?

  DavidInBD
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  mgebhard

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  Re: SlideShow method error

  May 11, 2018 08:23 PM|mgebhard|LINK

  dlchase

  That ALMOST worked.  The error went away but the image returned was placed after the </form> tag with style="display=none;"  when using using F12 developer tools.

  Can you see anything that would cause that?

  No, that worked.  This is a different issue.

  Have you tried placing a breakpoint in the web method to verify the web method is operating as expected?  I would assume you have more than one image returned or should have more than one.  

  I can't see the markup so I have no idea if you have everything setup correctly.  I did a quick google and found these.

  https://www.experts-exchange.com/questions/25071859/AJAX-SlideShow.html

  http://www.dotnetcurry.com/ShowArticle.aspx?ID=287

• • Reply
  dlchase

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  1396 Posts

  Re: SlideShow method error

  May 15, 2018 02:25 PM|dlchase|LINK

  Below is my markup and it is pretty simple but still no images appear, only a box outline where the image should be.

      <form id="form1" runat="server">
  
          <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
  
          <div id="slideshow" runat="server" class="row">
              <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6 img-responsive">
  
                  <asp:Image ID="ImgSlide" runat="server" Height="300" Width="300" />
  
                  <ajaxToolkit:SlideShowExtender ID="SlideShowExtender1" runat="server" 
                      TargetControlID="ImgSlide" 
                      SlideShowServiceMethod="GetSlides" 
                      SlideShowServicePath="~/WebServiceImages.asmx" 
                      AutoPlay="True" 
                      PlayInterval="1000" />
              </div>
          </div>
      </form>
  
  Below is web service code
  
  Imports System.IO
  Imports AjaxControlToolkit
  Imports System.Web.Services
  Imports System.Web.Script.Services
  
  ' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
  <System.Web.Script.Services.ScriptService()>
  <WebService(Namespace:="http://tempuri.org/")>
  <WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)>
  <Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()>
  Public Class WebServiceImages
      Inherits System.Web.Services.WebService
  
      <WebMethod()>
      Public Function GetSlides() As AjaxControlToolkit.Slide()
          Dim slides As New List(Of Slide)()
          Dim sPath As String = HttpContext.Current.Server.MapPath("~/ketodocs/")
          If sPath.EndsWith("\") Then
              'sPath = sPath.Remove(sPath.Length - 1)
          End If
          sPath &= "\slides"
          Dim pathUri As New Uri(sPath, UriKind.Absolute)
          Dim files As String() = Directory.GetFiles(sPath)
          For Each file As String In files
              Dim filePathUri As New Uri(file, UriKind.Absolute)
              slides.Add(New Slide() With {
                .Name = Path.GetFileNameWithoutExtension(file),
                .Description = Path.GetFileNameWithoutExtension(file) + " Description.",
                .ImagePath = pathUri.MakeRelativeUri(filePathUri).ToString()
          })
          Next
          Return slides.ToArray()
      End Function
  
  End Class

  DavidInBD
• • Reply
  dlchase

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  309 Points

  1396 Posts

  Re: SlideShow method error

  May 15, 2018 09:42 PM|dlchase|LINK

  Also, this might help, the img tag results in a src=undefined.

  DavidInBD
• • Reply
  Brando ZWZ

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  Re: SlideShow method error

  May 16, 2018 10:11 AM|Brando ZWZ|LINK

  Hi dlchase,

  According to your codes, I found the image path you have set in the GetSlides web method is wrong.

  It will only return image file name to the client-side.

  I suggest you could try to add the image folder at the root of the application and use below codes:

  

  Webmethod:

      <WebMethod()>
      Public Function GetSlides() As AjaxControlToolkit.Slide()
          Dim slides As New List(Of Slide)()
          Dim sPath As String = HttpContext.Current.Server.MapPath("~/ketodocs/")
          If sPath.EndsWith("\") Then
              'sPath = sPath.Remove(sPath.Length - 1)
          End If
          sPath &= "slides\"
          'Dim pathUri As New Uri(sPath, UriKind.Absolute)
          Dim files As String() = Directory.GetFiles(sPath)
          For Each file As String In files
              'Dim filePathUri As New Uri(file, UriKind.Absolute)
              slides.Add(New Slide() With {
                .Name = Path.GetFileNameWithoutExtension(file),
                .Description = Path.GetFileNameWithoutExtension(file) + " Description.",
                .ImagePath = "ketodocs/slides/" + Path.GetFileName(file)
          })
          Next
          Return slides.ToArray()
  End Function
  

  Result:

  

  Best Regards,

  Brando

• • Reply
  dlchase

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  309 Points

  1396 Posts

  Re: SlideShow method error

  May 16, 2018 01:44 PM|dlchase|LINK

  Tried your code but still not getting images.  The hidden img tag (created by extender?) has a src=undefined rather than the path of src=ketodocs/slides/imagefile.jpg

  I am also trying to do this with just code-behind on page as below.  Also note that ketodocs is a virtual folder off the root.

  Imports System.IO
  Imports AjaxControlToolkit
  Imports System.Web.Services
  Imports System.Web.Script.Services
  Imports System.Collections.Generic
  
  Partial Class KetoStartNew
      Inherits System.Web.UI.Page
  
      <WebMethod()>
      Public Function GetSlides() As AjaxControlToolkit.Slide()
          Dim slides As New List(Of Slide)()
          Dim sPath As String = HttpContext.Current.Server.MapPath("~/ketodocs/")
          If sPath.EndsWith("\") Then
              'sPath = sPath.Remove(sPath.Length - 1)
          End If
          sPath &= "slides\"
          'Dim pathUri As New Uri(sPath, UriKind.Absolute)
          Dim files As String() = Directory.GetFiles(sPath)
          For Each file As String In files
              'Dim filePathUri As New Uri(file, UriKind.Absolute)
              slides.Add(New Slide() With {
                .Name = Path.GetFileNameWithoutExtension(file),
                .Description = Path.GetFileNameWithoutExtension(file) + " Description.",
                .ImagePath = "ketodocs/slides/" + Path.GetFileName(file)
          })
          Next
          Return slides.ToArray()
      End Function
  End Class

  And page (.aspx) markup as below.

  <%@ Page Language="VB" AutoEventWireup="false" CodeFile="KetoStartNew.aspx.vb" Inherits="KetoStartNew" %>
  <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
  
  <!DOCTYPE html>
  
  <html xmlns="http://www.w3.org/1999/xhtml">
  <head runat="server">
      <title></title>
  </head>
  <body>
      <form id="form1" runat="server">
          <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
          <div>
              <table>
                  <tr>
                      <td>
                          <asp:Image ID="Image1" runat="server" Height="300" Width="300" />
                          <cc1:SlideShowExtender ID="SlideShowExtender" runat="server" 
                              TargetControlID="Image1"
                              SlideShowServiceMethod="GetSlides" 
                              ImageTitleLabelID="lblImageTitle" 
                              ImageDescriptionLabelID="lblImageDescription"
                              AutoPlay="true" 
                              PlayInterval="2000" 
                              Loop="true">
                          </cc1:SlideShowExtender>
                      </td>
                  </tr>
                  <tr>
                      <td>
                          <asp:Label ID="lblImageTitle" runat="server" Text="Label"></asp:Label><br />
                          <asp:Label ID="lblImageDescription" runat="server" Text="Label"></asp:Label>
                      </td>
                  </tr>
              </table>
  
          </div>
      </form>
  </body>
  </html>

  DavidInBD
• • Reply
  dlchase

  Member

  309 Points

  1396 Posts

  Re: SlideShow method error

  May 16, 2018 02:27 PM|dlchase|LINK

  Nevermind...I fixed it from a typo. Thanks.

  DavidInBD