Inline Editing

You can define commands and set the edit mode to configure the Telerik UI Grid for ASP.NET Core for inline editing.

For runnable examples, refer to the demos on implementing the editing approaches in the Grid.

Setting the Inline Edit Mode

  1. Add a new class to the ~/Models folder. The following example uses the ProductViewModel name.

        public class ProductViewModel
    
        {
            public int ProductID { get; set; }
            // The ProductName property is required.
            [Required]
            public string ProductName { get; set; }
            // Use the Integer editor template for the UnitsInStock property.
            [UIHint("Integer")]
            public short? UnitsInStock { get; set; }
        }
    
  2. Open HomeController.cs and add a new action method which will return the Products as JSON. The Grid will make Ajax requests to this action.

        public ActionResult Products_Read([DataSourceRequest]DataSourceRequest request)
        {
            // ToDataSourceResult works with IEnumerable and IQueryable.
            using (var northwind = new NorthwindEntities())
            {
                IQueryable<Product> products = northwind.Products;
                DataSourceResult result = products.ToDataSourceResult(request);
                return Json(result);
            }
        }
    
  3. Add a new action method to HomeController.cs. It will be responsible for saving the new data items. Name the method Products_Create.

        public ActionResult Products_Create([DataSourceRequest]DataSourceRequest request, ProductViewModel product)
        {
            if (ModelState.IsValid)
            {
                using (var northwind = new NorthwindEntities())
                {
                    // Create a new Product entity and set its properties from the posted ProductViewModel.
                    var entity = new Product
                    {
                        ProductName = product.ProductName,
                        UnitsInStock = product.UnitsInStock
                    };
                    // Add the entity.
                    northwind.Products.Add(entity);
                    // Insert the entity in the database.
                    northwind.SaveChanges();
                    // Get the ProductID generated by the database.
                    product.ProductID = entity.ProductID;
                }
            }
            // Return the inserted product. The Grid needs the generated ProductID. Also return any validation errors.
            return Json(new[] { product }.ToDataSourceResult(request, ModelState));
        }
    
  4. Add a new action method to HomeController.cs. It will be responsible for saving the updated data items. Name the method Products_Update.

        public ActionResult Products_Update([DataSourceRequest]DataSourceRequest request, ProductViewModel product)
        {
            if (ModelState.IsValid)
            {
                using (var northwind = new NorthwindEntities())
                {
                    // Create a new Product entity and set its properties from the posted ProductViewModel.
                    var entity = new Product
                    {
                        ProductID = product.ProductID,
                        ProductName = product.ProductName,
                        UnitsInStock = product.UnitsInStock
                    };
                    // Attach the entity.
                    northwind.Products.Attach(entity);
                    // Change its state to Modified so Entity Framework can update the existing product instead of creating a new one.
                    northwind.Entry(entity).State = EntityState.Modified;
                    // Or use ObjectStateManager if using a previous version of Entity Framework.
                    // northwind.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified);
                    // Update the entity in the database.
                    northwind.SaveChanges();
                }
            }
            // Return the updated product. Also return any validation errors.
            return Json(new[] { product }.ToDataSourceResult(request, ModelState));
        }
    
  5. Add a new action method to HomeController.cs. It will be responsible for saving the deleted data items. Name the method Products_Destroy.

        public ActionResult Products_Destroy([DataSourceRequest]DataSourceRequest request, ProductViewModel product)
        {
            if (ModelState.IsValid)
            {
                using (var northwind = new NorthwindEntities())
                {
                    // Create a new Product entity and set its properties from the posted ProductViewModel.
                    var entity = new Product
                    {
                        ProductID = product.ProductID,
                                  ProductName = product.ProductName,
                                  UnitsInStock = product.UnitsInStock
                    };
                    // Attach the entity.
                    northwind.Products.Attach(entity);
                    // Delete the entity.
                    northwind.Products.Remove(entity);
                    // Or use DeleteObject if using a previous versoin of Entity Framework.
                    // northwind.Products.DeleteObject(entity);
                    // Delete the entity in the database.
                    northwind.SaveChanges();
                }
            }
            // Return the removed product. Also return any validation errors.
            return Json(new[] { product }.ToDataSourceResult(request, ModelState));
        }
    
  6. In the view, configure the Grid to use the action methods that were created in the previous steps. The Create, Update, and Destroy action methods have to return a collection with the modified or deleted records which will enable the DataSource to apply the changes accordingly. The Create method has to return a collection of the created records with the assigned ID field.

      @(Html.Kendo().Grid<KendoGridAjaxEditing.Models.ProductViewModel>()
            .Name("grid")
            .Columns(columns =>
            {
                columns.Bound(product => product.ProductID).Width(100);
                columns.Bound(product => product.ProductName);
                columns.Bound(product => product.UnitsInStock).Width(250);
                columns.Command(commands =>
                {
                    commands.Edit(); // The "edit" command will edit and update data items.
                    commands.Destroy(); // The "destroy" command removes data items.
                }).Title("Commands").Width(200);
            })
            .ToolBar(toolbar => toolbar.Create()) // The "create" command adds new data items.
            .Editable(editable => editable.Mode(GridEditMode.InLine)) // Use the inline edit mode.
            .DataSource(dataSource =>
                dataSource.Ajax()
                  .Model(model =>
                  {
                      model.Id(product => product.ProductID); // Specify the property which is the unique identifier of the model.
                      model.Field(product => product.ProductID).Editable(false); // Make the ProductID property not editable.
                  })
                  .Create(create => create.Action("Products_Create", "Home")) // Action invoked when the user saves a new data item.
                  .Read(read => read.Action("Products_Read", "Home"))  // Action invoked when the Grid needs data.
                  .Update(update => update.Action("Products_Update", "Home"))  // Action invoked when the user saves an updated data item.
                  .Destroy(destroy => destroy.Action("Products_Destroy", "Home")) // Action invoked when the user removes a data item.
            )
            .Pageable()
      )       
    

Handling ModelState Errors

When editing is performed, server validation is often needed. This section demonstrates how to use the AddModelError method with the Telerik UI Grid for ASP.NET Core.

  1. Perform all steps from the previous section.
  2. Add some validation code to the Products_Update method. For example, check the length of the ProductName property.

        public ActionResult Products_Update([DataSourceRequest]DataSourceRequest request, ProductViewModel product)
        {
            if (product.ProductName.Length < 3)
            {
                ModelState.AddModelError("ProductName", "ProductName should be at least three characters long.");
            }
            if (ModelState.IsValid)
            {
                using (var northwind = new NorthwindEntities())
                {
                    // Create a new Product entity and set its properties from the posted ProductViewModel.
                    var entity = new Product
                    {
                        ProductID = product.ProductID,
                                  ProductName = product.ProductName,
                                  UnitsInStock = product.UnitsInStock
                    };
    
                    // Attach the entity.
                    northwind.Products.Attach(entity);
                    // Change its state to Modified so Entity Framework can update the existing product instead of creating a new one.
                    northwind.Entry(entity).State = EntityState.Modified;
    
                    // Or use ObjectStateManager if using a previous version of Entity Framework.
                    // northwind.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified);
    
                    // Update the entity in the database.
                    northwind.SaveChanges();
                }
            }
            // Return the updated product. Also return any validation errors.
            return Json(new[] { product }.ToDataSourceResult(request, ModelState));
        }
    
  3. Subscribe to the DataSource.Error() event handler. It is fired when model state errors or other unexpected problem occur when making the Ajax request. In the event handler, display the errors and call the cancelChanges method of the Grid.

      @(Html.Kendo().Grid<KendoGridAjaxEditing.Models.ProductViewModel>()
            .Name("grid")
            .Columns(columns =>
            {
                columns.Bound(product => product.ProductID).Width(100);
                columns.Bound(product => product.ProductName);
                columns.Bound(product => product.UnitsInStock).Width(250);
                columns.Command(commands =>
                {
                    commands.Edit();
                    commands.Destroy();
                }).Title("Commands").Width(200);
            })
            .ToolBar(toolbar => toolbar.Create())
            .Editable(editable => editable.Mode(GridEditMode.InLine))
            .DataSource(dataSource =>
                dataSource.Ajax()
                  .Events(events => events.Error("grid_error")) // Handle the "error" event.
                  .Model(model =>
                  {
                      model.Id(product => product.ProductID);
                      model.Field(product => product.ProductID).Editable(false);
                  })
                  .Create(create => create.Action("Products_Create", "Home"))
                  .Read(read => read.Action("Products_Read", "Home"))
                  .Update(update => update.Action("Products_Update", "Home"))
                  .Destroy(destroy => destroy.Action("Products_Destroy", "Home"))
            )
            .Pageable()
      )
      <script>
      function grid_error(e) {
          if (e.errors) {
              var message = "There are some errors:\n";
              // Create a message containing all errors.
              $.each(e.errors, function (key, value) {
                  if ('errors' in value) {
                      $.each(value.errors, function () {
                          message += this + "\n";
                      });
                  }
              });
              // Display the message.
              alert(message);
              // Cancel the changes.
              var grid = $("#grid").data("kendoGrid");
              grid.cancelChanges();
          }
      }
      </script>
    

See Also

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