Home / Community & Support / Developer Productivity Tools Forums / Telerik MVC Extensions (superseded) > Slider > Slider as Editor requires 'Static' Name

• Sander

  Posted on May 21, 2011 (permalink)

  Hello,
  
  I like the Telerik slider for it's simplicity.
  
  So now I try to use the Slider as an Editor:
  
  

  <%

   

  @ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<int?>" %>

   

   

  <%

   

  = Html.Telerik().Slider<int>()

   

   

   

   

  .HtmlAttributes(new { style = "width:100" })

   

   

  .Min(0)

   

  .Max(10)

   

  .ShowButtons(

   

  true)

   

   

  .Value(Model)

   

  %>
  
  But when I run this, I get a runtime exception:
  
  System.ArgumentException was unhandled by user code
    Message=Value cannot be null or empty.
  Parameter name: expression
    Source=System.Web.Mvc
    ParamName=expression
    StackTrace:
         at System.Web.Mvc.ViewDataDictionary.GetViewDataInfo(String expression)
         at System.Web.Mvc.ViewDataDictionary.Eval(String expression)
         at Telerik.Web.Mvc.UI.InputComponentExtensions.GetValue[T](IInputComponent`1 instance, Func`2 converter)
         at Telerik.Web.Mvc.UI.Slider`1.WriteHtml(HtmlTextWriter writer)
         at Telerik.Web.Mvc.UI.ViewComponentBase.ToHtmlString()
         at Telerik.Web.Mvc.UI.ViewComponentBuilderBase`2.ToHtmlString()
         at Telerik.Web.Mvc.UI.ViewComponentBuilderBase`2.ToString()
         at System.IO.TextWriter.Write(Object value)
         at System.Web.Mvc.ViewPage.SwitchWriter.Write(Object value)
         at System.Web.UI.HtmlTextWriter.Write(Object value)
         at ASP.views_shared_editortemplates_slider_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\Data\Semac\Development\FeasibilityStudy\SmartEnergySemacClient\MvcApplication2\MvcApplication2\Views\Shared\EditorTemplates\Slider.ascx:line 2
         at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
         at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
         at System.Web.UI.Control.Render(HtmlTextWriter writer)
         at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
         at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
         at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
         at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
         at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
         at System.Web.UI.Page.Render(HtmlTextWriter writer)
         at System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer)
         at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
         at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
         at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
         at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
    InnerException:
  
  
  But when i add a static name (same name as the property in the viewmodel) to the editor:
  
  .Name("MySliderField")
  
  the slider works fine.
  
  My issues with this are:
   - adding a static name forces me to use this name (MySliderField) in each viewmodel
   - there can only be one slider on each viewmodel (property names are unique in a class in C#)
   - other editors like the IntegerTextBox do not require a static name
   
  Is there a fix for this?

   

  Reply

• Sander

  Posted on May 21, 2011 (permalink)

  Found it.
  
  I used the more generic Name found on other editors and now it works fine.

   

  <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<int?>" %>

  <%= Html.Telerik().Slider<int>()

          .Name(ViewData.TemplateInfo.GetFullHtmlFieldName(string.Empty))

          .HtmlAttributes(new { style = "width:100" })

          .Min(0)

          .Max(10)

          .ShowButtons(true)

          .Value(Model)

  %>

  Reply

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