Grid InCell Editing
In Cell editing allows the user to click cells and type new values immediately like in Excel. There is no need for Edit, Update and Cancel buttons.
Users can use the Tab, Shift+Tab and Enter keys to move between edited cells quickly. If validation is not satisfied, the user cannot exit edit mode, unless they satisfy validation, or cancel changes by pressing Esc.
Command columns and non-editable columns are skipped while tabbing.
The InCell edit mode provides a specific user experience and behaves differently than other edit modes. Please review the notes below to get a better understanding of these specifics.
Sections in this article
Basics
To enable InCell editing mode, set the EditMode property of the grid to Telerik.Blazor.GridEditMode.Incell. You can handle the OnUpdate, OnCreate and OnDelete events to perform the CUD operations, as shown in the example below.
To add a new item, you must add a toolbar with an Add command. OnCreate will fire immediately when you click the Add button - see Event Sequence below.
It is up to the data access logic to save the data once it is changed in the data collection. The example below showcases when that happens and adds some code to provide a visual indication of the change. In a real application, the code for handling data updates may be entirely different.
Incell Editing Example. See the code comments for details.
@using System.ComponentModel.DataAnnotations @* for the validation attributes *@
Click a cell, edit it and click outside of the grid to see the change. You can also use Tab, Shift+Tab and Enter to navigate between the cells.
<br />
<strong>Editing is prevented for the first two items.</strong>
<TelerikGrid Data=@MyData EditMode="@GridEditMode.Incell" Pageable="true" Height="500px"
OnUpdate="@UpdateHandler" OnEdit="@EditHandler" OnDelete="@DeleteHandler" OnCreate="@CreateHandler" OnCancel="@OnCancelHandler">
<GridToolBarTemplate>
<GridCommandButton Command="Add" Icon="@SvgIcon.Plus">Add Employee</GridCommandButton>
</GridToolBarTemplate>
<GridColumns>
<GridColumn Field=@nameof(SampleData.ID) Title="ID" Editable="false" />
<GridColumn Field=@nameof(SampleData.FirstName) Title="Name" />
<GridColumn Field=@nameof(SampleData.LastName) Title="Last Name" />
<GridCommandColumn>
<GridCommandButton Command="Delete" Icon="@SvgIcon.Trash">Delete</GridCommandButton>
</GridCommandColumn>
</GridColumns>
</TelerikGrid>
@code {
void EditHandler(GridCommandEventArgs args)
{
SampleData item = (SampleData)args.Item;
// prevent opening for edit based on condition
if (item.ID < 3)
{
args.IsCancelled = true;// the general approach for cancelling an event
}
Console.WriteLine("Edit event is fired.");
}
async Task UpdateHandler(GridCommandEventArgs args)
{
SampleData item = (SampleData)args.Item;
// perform actual data source operations here through your service
await MyService.Update(item);
// update the local view-model data with the service data
await GetGridData();
Console.WriteLine("Update event is fired.");
}
async Task DeleteHandler(GridCommandEventArgs args)
{
SampleData item = (SampleData)args.Item;
// perform actual data source operation here through your service
await MyService.Delete(item);
// update the local view-model data with the service data
await GetGridData();
Console.WriteLine("Delete event is fired.");
}
async Task CreateHandler(GridCommandEventArgs args)
{
SampleData item = (SampleData)args.Item;
// perform actual data source operation here through your service
await MyService.Create(item);
// update the local view-model data with the service data
await GetGridData();
Console.WriteLine("Create event is fired.");
}
void OnCancelHandler(GridCommandEventArgs args)
{
SampleData item = (SampleData)args.Item;
Console.WriteLine("Cancel event is fired. Can be useful when people decide to not satisfy validation");
}
// in a real case, keep the models in dedicated locations, this is just an easy to copy and see example
public class SampleData
{
public int ID { get; set; }
[Required]
public string FirstName { get; set; }
public string LastName { get; set; }
}
public List<SampleData> MyData { get; set; }
async Task GetGridData()
{
MyData = await MyService.Read();
}
protected override async Task OnInitializedAsync()
{
await GetGridData();
}
// the following static class mimics an actual data service that handles the actual data source
// replace it with your actual service through the DI, this only mimics how the API can look like and works for this standalone page
public static class MyService
{
private static List<SampleData> _data { get; set; } = new List<SampleData>();
public static async Task Create(SampleData itemToInsert)
{
itemToInsert.ID = _data.Count + 1;
_data.Insert(0, itemToInsert);
}
public static async Task<List<SampleData>> Read()
{
if (_data.Count < 1)
{
for (int i = 1; i < 50; i++)
{
_data.Add(new SampleData()
{
ID = i,
FirstName = "Name " + i.ToString(),
LastName = "Last Name " + i.ToString()
});
}
}
return await Task.FromResult(_data);
}
public static async Task Update(SampleData itemToUpdate)
{
var index = _data.FindIndex(i => i.ID == itemToUpdate.ID);
if (index != -1)
{
_data[index] = itemToUpdate;
}
}
public static async Task Delete(SampleData itemToDelete)
{
_data.Remove(itemToDelete);
}
}
}
InCell editing behavior
Event Sequence
-
The
OnCreateevent will fire as soon as you click theAddbutton. The Grid will render the new row and enter edit mode for the first editable column (to fireOnEditand let the user alter the column). This means you should have default values that satisfy any initial validation and requirements your models may have.- This means that there is no actual inserted item, an item in InCell editing is always in Edit mode, never in Insert mode. Thus, you cannot use the
InsertedItemfield of the Grid State. If you want to insert items programmatically in the Grid, alter theDatacollection, and use theOriginalEditItemfeature of the state (see the Initiate Editing or Inserting of an Item example - it can put the InLine and Popup edit modes in Insert mode, but this cannot work for InCell editing).
- This means that there is no actual inserted item, an item in InCell editing is always in Edit mode, never in Insert mode. Thus, you cannot use the
The
OnEditevent fires every time a cell is opened for editing. Until version 2.27, the event fired once per row - when the user edits a cell from a different row.The
OnUpdateevent fires every time an edited cell is closed. Until version 2.27, the event fired once per row - when the currently edited row loses focus.If there is a cell that is being edited at the moment, clicking on another cell will first close the current cell and fire
OnUpdate. To start editing the new cell, you need a second click. When the user removes focus from the Grid or the current row, theOnUpdateevent fires, where the data-access logic can move it to the actual data source.The
OnCancelevent works only when pressingEsc. TheCancelcommand button is not supported. Clicking outside the currently edited cell will triggerOnUpdateand thus, clicking on theCancelcommand button will not fire theOnCancelevent, because an update has already occured.
Incell Editing and Selection
-
To enable row selection with InCell Edit Mode, add a
<GridCheckboxColumn />to the<Columns>collection. More information on that can be read in the Row Selection article.- To see how to select the row that is being edited in InCell edit mode without using a
<GridCheckboxColumn />check out the Row Selection in Edit with InCell EditMode Knowledge Base article.
- To see how to select the row that is being edited in InCell edit mode without using a
Editor Template
The incell editor template requires a focusable element to maintain the tab order when using the keyboard. If you prevent editing based on a runtime condition, you must provide some focusable element. (Setting Editable=false for the entire column does not require a focusable element.) Here is one way to add a focusable non-editable element:
<EditorTemplate>
@{
if (myCurrentEditCondition)
{
<MyCustomEditor />
}
else
{
<div tabindex="0">editing not allowed</div>
}
}
</EditorTemplate>