Client Detail Templates

The Telerik UI Grid for ASP.NET MVC enables you to show additional information for a data item by setting the detail template of the Grid.

For a runnable example, refer to the demo on detail templates in the Grid.

To configure the client detail template:

  1. Define the client details
  2. Set the client hierarchy

Defining the Client Details

To configure the Grid for ASP.NET Core to display additional details of the Product entity from the Northwind database:

  1. Create a new ASP.NET MVC 4 application. If you have installed the Telerik UI for ASP.NET MVC Visual Studio Extensions, create a Telerik UI for ASP.NET MVC application. Name the application KendoGridClientDetailTemplate. If you decided not to use the Telerik UI for ASP.NET MVC Visual Studio Extensions, follow the steps from the introductory article to add Telerik UI for ASP.NET MVC to the application.
  2. Add a new Entity Framework Data Model. Right-click the ~/Models folder in the solution explorer and pick Add > New Item. Choose Data > ADO.NET Entity Data Model in the Add New Item dialog. Name the model Northwind.edmx and click Next. This starts the Entity Data Model Wizard.

    A new entity data model

  3. Select Generate from database and click Next. Configure a connection to the Northwind database. Click Next.

    Choosing the connection

  4. Choose the Products table from the Which database objects do you want to include in your model?. Leave all other options as they are set by default. Click Finish.

    Choosing the Products table

  5. Open HomeController.cs and add a new action method which will return the Products as JSON. The Grid makes Ajax requests to this action.

    public ActionResult Products_Read()
    {
    }
    
  6. Add a new parameter of type Kendo.Mvc.UI.DataSourceRequest to the action. This parameter will contain the current Grid request information—page, sort, group, and filter. Decorate that parameter with the Kendo.Mvc.UI.DataSourceRequestAttribute. This attribute will populate the DataSourceRequest object from the posted data. Import the Kendo.Mvc.UI namespace.

    public ActionResult Products_Read([DataSourceRequest]DataSourceRequest request)
    {
    }
    
  7. Use the ToDataSourceResult extension method to convert the Products to a Kendo.Mvc.UI.DataSourceResult object. That extension method will page, filter, sort, or group your data using the information provided by the DataSourceRequest object. To use the ToDataSourceResult extension method, import the Kendo.Mvc.Extensions namespace.

    public ActionResult Products_Read([DataSourceRequest]DataSourceRequest request)
    {
        using (var northwind = new NorthwindEntities())
        {
            IQueryable<Product> products = northwind.Products;
            DataSourceResult result = products.ToDataSourceResult(request);
        }
    }
    
  8. Return the DataSourceResult as JSON. Now configure Kendo UI Grid for Ajax binding.

    public ActionResult Products_Read([DataSourceRequest]DataSourceRequest request)
    {
        using (var northwind = new NorthwindEntities())
        {
            IQueryable<Product> products = northwind.Products;
            DataSourceResult result = products.ToDataSourceResult(request);
            return Json(result);
        }
    }
    
  9. In the view, configure the Grid to use the action method created in the previous steps.

        <%: Html.Kendo().Grid<KendoGridClientDetailTemplate.Models.Product>()
            .Name("grid")
            .DataSource(dataSource => dataSource
                .Ajax()
                .Read(read => read.Action("Products_Read", "Home"))
            )
            .Columns(columns =>
            {
                columns.Bound(product => product.ProductID);
                columns.Bound(product => product.ProductName);
            })
            .Pageable()
        %>
    
        @(Html.Kendo().Grid<KendoGridClientDetailTemplate.Models.Product>()
            .Name("grid")
            .DataSource(dataSource => dataSource
                .Ajax()
                .Read(read => read.Action("Products_Read", "Home"))
            )
            .Columns(columns =>
            {
                columns.Bound(product => product.ProductID);
                columns.Bound(product => product.ProductName);
            })
            .Pageable()
        )
    
  10. Define the client template using the Kendo UI template syntax. The context of the template is the data item—Product entity—to which the current Grid row is bound.

    Each # symbol that is not part of a template expression—#: #, # # or #= #—must be escaped—\\#.

    <script id="client-template" type="text/x-kendo-template">
        <div>ProductID: #: ProductID #</div>
        <div>ProductName: #: ProductName #</div>
        <div>UnitsInStock: #: UnitsInStock #</div>
        <div>UnitPrice: #: UnitPrice #</div>
        <div>UnitsOnOrder: #: UnitsOnOrder #</div>
        <div>Discontinued: #: Discontinued #</div>
    </script>
    
  11. Specify the id of the template using the ClientDetailTemplateId method.

        <%: Html.Kendo().Grid<KendoGridClientDetailTemplate.Models.Product>()
            .Name("grid")
            .DataSource(dataSource => dataSource
                .Ajax()
                .Read(read => read.Action("Products_Read", "Home"))
            )
            .Columns(columns =>
            {
                columns.Bound(product => product.ProductID);
                columns.Bound(product => product.ProductName);
            })
            .Pageable()
            .ClientDetailTemplateId("client-template")
        %>
    
        @(Html.Kendo().Grid<KendoGridClientDetailTemplate.Models.Product>()
            .Name("grid")
            .DataSource(dataSource => dataSource
                .Ajax()
                .Read(read => read.Action("Products_Read", "Home"))
            )
            .Columns(columns =>
            {
                columns.Bound(product => product.ProductID);
                columns.Bound(product => product.ProductName);
            })
            .Pageable()
            .ClientDetailTemplateId("client-template")
        )
    
  12. Build and run the project.

    The final result

To download the Visual Studio Project, refer to this GitHub repository.

Setting the Client Hierarchy

To configure the Grid for ASP.NET Core to display all Product entities that are available per the Category entity from the Northwind database:

  1. Create a new ASP.NET MVC 4 application. If you have installed the Telerik UI for ASP.NET MVC Visual Studio Extensions, create a Telerik UI for ASP.NET MVC application. Name the application KendoGridClientHierarchy. If you decided not to use the Telerik UI for ASP.NET MVC Visual Studio Extensions, follow the steps from the introductory article to add Telerik UI for ASP.NET MVC to the application.
  2. Add a new Entity Framework Data Model. Right-click the ~/Models folder in the solution explorer and pick Add > New Item. Choose Data > ADO.NET Entity Data Model in the Add New Item dialog. Name the model Northwind.edmx and click Next. This starts the Entity Data Model Wizard.

    A new entity data model

  3. Select Generate from database and click Next. Configure a connection to the Northwind database. Click Next.

    Choosing the connection

  4. Choose the Products and Categories tables from Which database objects do you want to include in your model?. Leave all other options as they are set by default. Click Finish.

  5. Open HomeController.cs and add a new action method which will return the Category entities as JSON. The Grid makes Ajax requests to this action.

    public ActionResult Categories_Read()
    {
    }
    
  6. Add a new parameter of type Kendo.Mvc.UI.DataSourceRequest to the action. This parameter will contain the current grid request information - page, sort, group and filter. Decorate that parameter with the Kendo.Mvc.UI.DataSourceRequestAttribute. That attribute will populate the DataSourceRequest object from the posted data. Import the Kendo.Mvc.UI namespace.

    public ActionResult Categories_Read([DataSourceRequest]DataSourceRequest request)
    {
    }
    
  7. Use the ToDataSourceResult extension method to convert the Categories to a Kendo.Mvc.UI.DataSourceResult object. That extension method will page, filter, sort, or group your data using the information provided by the DataSourceRequest object. To use the ToDataSourceResult extension method import the Kendo.Mvc.Extensions namespace.

    public ActionResult Categories_Read([DataSourceRequest]DataSourceRequest request)
    {
        using (var northwind = new NorthwindEntities())
        {
            IQueryable<Category> categories = northwind.Categories;
            // Flatten the Category to avoid circular references during JSON serialization.
            DataSourceResult result = categories.ToDataSourceResult(request, category => new {
                category.CategoryID,
                category.CategoryName
            });
        }
    }
    
  8. Return the DataSourceResult as JSON. Now let's configure Kendo UI Grid for AJAX binding.

    public ActionResult Categories_Read([DataSourceRequest]DataSourceRequest request)
    {
        using (var northwind = new NorthwindEntities())
        {
            IQueryable<Category> categories = northwind.Categories;
            // Flatten the Category to avoid circular references during JSON serialization.
            DataSourceResult result = categories.ToDataSourceResult(request, category => new {
                category.CategoryID,
                category.CategoryName
            });
            return Json(result);
        }
    }
    
  9. Open HomeController.cs and add a new action method which will return the Product entities for a given category as JSON. The child Grid makes Ajax requests to this action.

    public ActionResult Products_Read([DataSourceRequest]DataSourceRequest request, int categoryId)
    {
        using (var northwind = new NorthwindEntities())
        {
            IQueryable<Product> products = northwind.Products.Where(product => product.CategoryID == categoryId);
            // Flatten the Product to avoid circular references during JSON serialization
            DataSourceResult result = products.ToDataSourceResult(request, product => new {
                product.ProductID,
                product.ProductName
            });
            return Json(result);
        }
    }
    
  10. In the view, configure the Grid for Ajax binding to Categories_Read.

        <%: Html.Kendo().Grid<KendoGridClientHierarchy.Models.Category>()
            .Name("grid")
            .Columns(columns =>
            {
                columns.Bound(category => category.CategoryID);
                columns.Bound(category => category.CategoryName);
            })
            .DataSource(dataSource =>
            dataSource.Ajax().Read(read => read.Action("Categories_Read", "Home"))
            )
        %>
    
        @(Html.Kendo().Grid<KendoGridClientHierarchy.Models.Category>()
            .Name("grid")
            .Columns(columns =>
            {
                columns.Bound(category => category.CategoryID);
                columns.Bound(category => category.CategoryName);
            })
            .DataSource(dataSource =>
            dataSource.Ajax().Read(read => read.Action("Categories_Read", "Home"))
            )
        )
    
  11. Define the client template by using Kendo UI for jQuery template syntax. The context of the template is the Category entity to which the current Grid row is bound. The template itself contains another Grid which is bound to the Products_Read action.

    • Always call the ToClientTemplate method when using Telerik UI for ASP.NET MVC widgets in a client template.
    • Escape the # characters used for a template expression when using a column ClientTemplate in a detail template, so that the expression is evaluated in the correct context.
    <script id="client-template" type="text/x-kendo-template">
        @(Html.Kendo().Grid<KendoGridClientHierarchy.Models.Product>()
                .Name("grid_#=CategoryID#") // make sure the Name is unuque
                .Columns(columns =>
                {
                    columns.Bound(product => product.ProductID);
                    columns.Bound(product => product.ProductName).ClientTemplate("<strong>\\#:ProductName\\#</strong>"); // escape the "#" characters
                })
                .DataSource(dataSource =>
                    // Make a request to Products_Read and provide the current CategoryID as a route parameter.
                    dataSource.Ajax().Read(read => read.Action("Products_Read", "Home", new { categoryId = "#=CategoryID#" }))
                )
                .Pageable()
                .ToClientTemplate()
        )
    </script>
    
  12. Specify the id of the template using the ClientDetailTemplateId method.

        <%: Html.Kendo().Grid<KendoGridClientHierarchy.Models.Category>()
            .Name("grid")
            .Columns(columns =>
            {
                columns.Bound(category => category.CategoryID);
                columns.Bound(category => category.CategoryName);
            })
            .DataSource(dataSource =>
                dataSource.Ajax().Read(read => read.Action("Categories_Read", "Home"))
            )
            .ClientDetailTemplateId("client-template")
        %>
    
        @(Html.Kendo().Grid<KendoGridClientHierarchy.Models.Category>()
            .Name("grid")
            .Columns(columns =>
            {
                columns.Bound(category => category.CategoryID);
                columns.Bound(category => category.CategoryName);
            })
            .DataSource(dataSource =>
                dataSource.Ajax().Read(read => read.Action("Categories_Read", "Home"))
            )
            .ClientDetailTemplateId("client-template")
        )
    
  13. Build and run the project.

    The final result

To download the Visual Studio Project, refer to [this GitHub repository]((https://github.com/telerik/ui-for-aspnet-mvc-examples/tree/master/grid/client-hierarchy).

Nesting Client Templates

By default, Telerik UI for ASP.NET MVC does not support nested client templates. For more information on this issue, check the Grid troubleshooting section in invalid template errors when nesting client templates.

See Also

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