Slider in Razor Pages

This article describes how to seamlessly integrate and configure the Telerik UI Slider for ASP.NET Core in Razor Pages applications.

Referencing Handler Methods in Razor Pages

Razor Pages is an alternative to the MVC pattern that makes page-focused coding easier and more productive. This approach consists of a cshtml file and a cshtml.cs file (by convention, the two files have the same name).

The cshtml.cs file, known as the PageModel, contains handler methods that respond to HTTP requests. These methods are prefixed with On followed by the HTTP verb (for example, OnGet, OnPost, OnPostRead, OnPostCreate).

Handler methods declared in a PageModel can be referenced from any Razor Page using one of the following URL patterns:

• Using Url.Page()

  C#

  Url.Page("PageName", "HandlerName")
  // OR
  Url.Page("/FolderName/PageName", "HandlerName")

  For example, Url.Page("Index", "Read") references the OnPostRead or OnGetRead handler method in the Index.cshtml.cs file.

• Using a query string

  C#

  Url("/PathToPage?handler=HandlerName")

  For example, Url("/Index?handler=Read") references the OnPostRead or OnGetRead handler method in the Index page.

For more information on Razor Pages architecture and concepts, refer to the official Microsoft documentation.

Binding to a PageModel Property

To bind the Slider to a property from the PageModel, follow the next steps:

1. Add a property to the PageModel that must bind to the Slider.

   C#

       public class IndexModel : PageModel
       {
           [BindProperty]
           public int Grade { get; set; }
   
           public void OnGet()
           {
               Grade = 5; // Assign value to the "Grade" property, if needed.
           }
       }

2. Declare the PageModel at the top of the page.

   Razor

       @page
       @model IndexModel

3. Bind the Slider to the property using the SliderFor() configuration.

   HtmlHelperTagHelper

   Razor

   @page
   @model IndexModel
   
   @inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Xsrf
   @Html.AntiForgeryToken()
   
   @(Html.Kendo().SliderFor(m => m.Grade)
       .Min(1)
       .Max(10)
   )

   Razor

       @page
       @model IndexModel
   
       @inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Xsrf
       @Html.AntiForgeryToken()
       @addTagHelper *, Kendo.Mvc
   
       <kendo-slider for="Grade"
           max="10"
           min="1">
       </kendo-slider>

See Also

• Using Telerik UI for ASP.NET Core in Razor Pages
• Client-Side API of the Slider
• Server-Side HtmlHelper API of the Slider
• Server-Side TagHelper API of the Slider
• Knowledge Base Section