Hi there,
currently the grid component does not provide a feature to set a specific position in virtual scrolling mode.
My team has currently implemented a workaround via javascript interop call to set a specific position. The workaround basically calculates the "scroll value" (we reverse engineered this value by looking at the Telerik js code) and passes it to the jQuery scrollTop() function. This results in an update of the scrollbar which in return triggers the OnReadItems event where we fetch the items based on the given skip and take values.
This workaround does not seem to work in all cases and is somewhat unreliable hence i'm requesting an official feature to set a specific position without the javascript hack.
What do you say?
So lonG
Daniel
Reproducible
@page "/"
@inject NavigationManager NavMan
<TelerikGrid Data=@GridDataToShow
SelectionMode="GridSelectionMode.Single"
SelectedItemsChanged="@((IEnumerable<Employee> employeeList) => OnSelect(employeeList))"
Pageable="true"
Height="300px">
<GridColumns>
<GridColumn Field=@nameof(Employee.Name) />
<GridColumn Field=@nameof(Employee.Team) Title="Team" />
</GridColumns>
</TelerikGrid>
@code {
public List<Employee> GridData { get; set; }
public Employee SelectedEmployee { get; set; }
public List<Employee> GridDataToShow // this causes the issue
{
get
{
return GridData.OrderBy(x => x.EmployeeId).ToList();
}
}
protected override void OnInitialized()
{
GridData = new List<Employee>();
for (int i = 0; i < 15; i++)
{
GridData.Add(new Employee()
{
EmployeeId = i,
Name = "Employee " + i.ToString(),
Team = "Team " + i % 3
});
}
}
protected async Task OnSelect(IEnumerable<Employee> employees)
{
Console.WriteLine("aaa");
SelectedEmployee = employees.FirstOrDefault();
// NavMan.NavigateTo("counter");
}
public class Employee
{
public int EmployeeId { get; set; }
public string Name { get; set; }
public string Team { get; set; }
}
}
Reproducible
<TelerikButton OnClick="@(_ => _Splited = !_Splited)">Toggle columns - works fine</TelerikButton><br />Select a single row to see the error
<TelerikGrid Data="@GridData"
Height="480px" RowHeight="40" PageSize="100" SelectionMode="@GridSelectionMode.Multiple"
Sortable="true" FilterMode="@GridFilterMode.FilterMenu"
SelectedItemsChanged="@((IEnumerable<Order> objectList) => OnSelect(objectList))"
OnRead=@ReadOrders
Pageable="true"
Resizable="true"
TotalCount=@TotalOrders>
<GridColumns>
<GridCheckboxColumn SelectAll="@ShowSelectAll"></GridCheckboxColumn>
<GridColumn Field="@(nameof(Order.Id))" Title="@(nameof(Order.Id))" />
@if (!_Splited)
{
<GridColumn Field="@(nameof(Order.Name))" Title="@(nameof(Order.Name))" />
<GridColumn Field="CreatedAt">
<Template>
@((context as Order).CreatedAt.ToString("dd.MM.yyyy - HH:mm"))
</Template>
</GridColumn>
<GridColumn Field="@(nameof(Order.State))" Title="@(nameof(Order.State))" />
}
else
{
<GridColumn Field="@(nameof(Order.Name))" Title="@(nameof(Order.Name))" />
<GridColumn Field="@(nameof(Order.State))" Title="@(nameof(Order.State))" />
}
</GridColumns>
</TelerikGrid>
@code {
bool ShowSelectAll;
bool _Splited = false;
public int TotalOrders { get; set; } = 1000;
public IEnumerable<Order> GridData { get; set; }
protected override async Task OnInitializedAsync()
{
}
protected async Task OnSelect(IEnumerable<Order> objectList)
{
if (objectList.Count() == 1) // considered as single select, so it goes to SplitView and the list needs to shrink
{
_Splited = true;
}
else // it's in the multi-select mode, so it stays or gets back to the list
{
_Splited = false;
}
}
private async Task<IEnumerable<Order>> LoadData()
{
var OrderData = new List<Order>();
for (int i = 1; i < 1001; i++)
{
OrderData.Add(new Order()
{
Id = Guid.NewGuid(),
Name = $"Order {i}",
CreatedAt = DateTime.Now.AddDays((Convert.ToInt32(new Random().Next(10)))),
State = (OrderState)new Random().Next(0, 2),
});
}
return OrderData.AsEnumerable();
}
protected async Task ReadOrders(GridReadEventArgs args)
{
int pageNo = args.Request.Page;
int pageSize = 100;
var totalData = await LoadData();
GridData = totalData.Skip(pageSize * (pageNo - 1)).Take(pageSize);
}
public class Order
{
public Guid Id { get; set; }
public string Name { get; set; }
public DateTime CreatedAt { get; set; }
public OrderState State { get; set; }
}
public enum OrderState
{
Open,
Canceled,
Closed,
}
}
Looking through the examples I can't find one with SelectionMode="GridSelectionMode.Multiple" and using a RowTemplate.
ADMIN EDIT: This is not a bug in the component, an example of how this can be implemented by the app is available in the comments.
I'm not sure what I should be binding my checkbox to so it accurately reflects selection state.
From the RowTemplate Example adding SelectionMode:
<TelerikGrid Data=@GridData
@bind-SelectedItems="@SelectedItems"
SelectionMode="GridSelectionMode.Multiple" Height="@Height">
<RowTemplate Context="product"> @*Trying to inspect what is generated in the examples I came up with this, but not sure what to bind to checked*@
<td role="gridcell" colspan=0 data-col-index="0">
<span>
<input class="k-checkbox k-grid-checkbox telerik-blazor" type="checkbox" />
</span>
</td><td> <img class="rounded-circle" src="@($"images/{product.ProductId}.jpg")" alt="Alternate Text" /> @product.ProductName </td> <td> @(String.Format("{0:C2}", product.UnitPrice)) </td> </RowTemplate> <GridColumns> <GridColumn Field=@nameof(Product.ProductName) Title="Product Name" /> <GridColumn Field=@nameof(Product.UnitPrice) Title="Unit Price" /> </GridColumns> </TelerikGrid>
In the following reproducible, try filtering the third column (SomeNavigationProperty.Field1). It does not work.
<TelerikGrid Data="@myData" Pageable="true" Sortable="true" FilterMode="@GridFilterMode.FilterRow" Groupable="true"><GridColumns>
<GridColumn Field="@nameof(SampleComplexObject.ID)" Title="ID"></GridColumn>
<GridColumn Field="@nameof(SampleComplexObject.Name)" Title="The Name"></GridColumn>
<GridColumn Title="First Nested Property" Field="SomeNavigationProperty.Field1" />
<GridColumn Field="SomeNavigationProperty.OtherField" />
</GridColumns>
</TelerikGrid>
@code {
public class SampleComplexObject
{
public int ID { get; set; }
public string Name { get; set; }
public NestedObject SomeNavigationProperty { get; set; } // use this field name for data binding
}
public class NestedObject
{
public int Field1 { get; set; }
public string OtherField { get; set; }
}
public IEnumerable<SampleComplexObject> myData = Enumerable.Range(1, 50).Select(x =>
new SampleComplexObject
{
ID = x,
Name = "Name " + x,
SomeNavigationProperty = new NestedObject
{
Field1 = x,
OtherField = "second " + x % 6
}
}
);
}
.png){kind=avatar}
row height set in grid definition must apply to all rows in the grid for row virtualization as of now.
in real business case there might be complex content in each row that can't reinforce this - but if each row report its own height, grid still can visualize the load, and it will be much more flexible.
- Go to https://demos.telerik.com/blazor-ui/grid/persist-state
- Click the Reset State button
- Try to reoder columns (e.g., drag the ID column to the end)
When I have a Navigable grid and I press Esc on the keyboard while editing/inserting a row, I want to do something (e.g., clean up the newly inserted row altogether from the data). Usually, I can use the OnCancel event for this, but it does not fire when pressing the Esc key on the keyboard.
*** Thread created on customer behalf by admin ***
When I enter edit mode for a cell (I used InCell edit mode), the row height decreases.
*** Thread created by admin on customer behalf ***
Select one or more rows
Right click another of the rows (there is code in the OnContextMenu handler that changes the selected items to the currently clicked row)
<TelerikContextMenu @ref="@ContextMenuRef" Data="@MenuItems" OnClick="@((MenuItem item) => OnItemClick(item))"></TelerikContextMenu>
<TelerikGrid Data=@GridData
@ref="Grid"
SelectionMode="GridSelectionMode.Multiple"
@bind-SelectedItems="@SelectedEmployees"
@bind-Page="@CurrentPage"
PageSize="@PageSize"
OnRowContextMenu="OnContextMenu"
Pageable="true">
<GridColumns>
<GridCheckboxColumn />
<GridColumn Field=@nameof(Employee.EmployeeId) />
<GridColumn Field=@nameof(Employee.Name) />
<GridColumn Field=@nameof(Employee.Team) />
</GridColumns>
</TelerikGrid>
@if (SelectedEmployees != null)
{
<ul>
@foreach (Employee employee in SelectedEmployees.OrderBy(e => e.EmployeeId))
{
<li>
@employee.EmployeeId
</li>
}
</ul>}
@code {
public IEnumerable<Employee> SelectedEmployees { get; set; } = Enumerable.Empty<Employee>();
TelerikContextMenu<MenuItem> ContextMenuRef { get; set; }
TelerikGrid<Employee> Grid { get; set; }
List<MenuItem> MenuItems { get; set; }
int CurrentPage { get; set; } = 1;
int PageSize { get; set; } = 5;
//data binding and sample data
public List<Employee> GridData { get; set; }
protected override void OnInitialized()
{
GridData = new List<Employee>();
for (int i = 0; i < 15; i++)
{
GridData.Add(new Employee()
{
EmployeeId = i,
Name = "Employee " + i.ToString(),
Team = "Team " + i % 3
});
}
MenuItems = new List<MenuItem>()
{
new MenuItem(){ Text = "Delete", Icon = IconName.Delete, CommandName = "Delete"}
};
}
protected async Task OnItemClick(MenuItem item)
{
if (item.Action != null)
{
item.Action.Invoke();
}
else
{
switch (item.CommandName)
{
case "Delete":
await Task.Delay(1); // do something
break;
}
}
}
protected async Task OnContextMenu(GridRowClickEventArgs args)
{
if (!(args.Item is Employee employee))
return;
SelectedEmployees = new List<Employee> { employee }; // this does not work
if (args.EventArgs is MouseEventArgs mouseEventArgs)
{
await ContextMenuRef.ShowAsync(mouseEventArgs.ClientX, mouseEventArgs.ClientY);
}
}
public class Employee
{
public int EmployeeId { get; set; }
public string Name { get; set; }
public string Team { get; set; }
}
public class MenuItem
{
public string Text { get; set; }
public string Icon { get; set; }
public Action Action { get; set; }
public string CommandName { get; set; }
}
}
*** Thread created by admin on customer behalf ***
1. Click the Previous page button in the pager
<TelerikGrid Data="@MyData" Pageable="true" Navigable="true">
<GridColumns>
<GridColumn Field="ID"></GridColumn>
<GridColumn Field="TheName" Title="Employee Name"></GridColumn>
</GridColumns>
</TelerikGrid>
@code {
public IEnumerable<object> MyData = Enumerable.Range(1, 50).Select(x => new { ID = x, TheName = "name " + x });
}
Hello,
When using grid command button edit with the onedit handler shown in this documentation https://docs.telerik.com/blazor-ui/components/grid/editing/inline
There is a bug that causes the grid to reset to the first page when editing the last item on any page that isn't the first. In other words we can edit the last item in the gird on the first page but not on the second, third, fourth...etc.
I have taken out all the logic in my edit handler as well and the problem still presents itself.
Below is the relevenat code sample and I have also zipped a short video demonstrating the behavior.
<TelerikGrid @ref="@GridNameHere"
Class="smallerFont"
Data="@DataHere"
Pageable="true"
Page="@Page"
PageSize="@PageSize"
TotalCount="@Total"
Sortable="@true"
Groupable="@false"
FilterMode="@GridFilterMode.FilterMenu"
Reorderable="@true"
OnEdit="@OnEdit"
OnUpdate="@OnUpdate"
OnCreate="@OnUpdate">
<GridToolBar>
<GridCommandButton Command="Add" Icon="add">Add</GridCommandButton>
</GridToolBar>
<GridColumns>
<GridCommandColumn Width="150px">
<GridCommandButton Command="Edit" Icon="edit">Edit</GridCommandButton>
<GridCommandButton Command="Save" Icon="save" ShowInEdit="true">Save</GridCommandButton>
<GridCommandButton Command="Cancel" Icon="cancel" ShowInEdit="true">Cancel</GridCommandButton>
</GridCommandColumn>
<GridColumn Field="@(nameof(ModelName.FieldName))" Title="Column Name" Width="100px" />
</GridColumns>
</TelerikGrid>
//Handler for edit
protected void OnEdit(GridCommandEventArgs args)
{
// no code in here and problem still presents itself but feel free to put anything I recommend using the sample from the documentation above
}
For example, when I have two levels of grouping, I want to render only the inner footer templates, but not the outer.
While this is possible with some CSS like the snippet below, this does not scale well, and does not work well for arbitrary number of groups
<style>
.k-group-footer + .k-group-footer {
display:none;
}
</style>
Group by the Vacation and Team columns to see the effect
<TelerikGrid Data=@GridData Groupable="true" Pageable="true">
<GridColumns>
<GridColumn Field=@nameof(Employee.Name) Groupable="false" />
<GridColumn Field=@nameof(Employee.Team) Title="Team">
<GroupFooterTemplate>
Team group footer
</GroupFooterTemplate>
</GridColumn>
<GridColumn Field=@nameof(Employee.IsOnLeave) Title="On Vacation">
<GroupFooterTemplate>
IsOnLeave group footer
</GroupFooterTemplate>
</GridColumn>
</GridColumns>
</TelerikGrid>
@code {
public List<Employee> GridData { get; set; }
protected override void OnInitialized()
{
GridData = new List<Employee>();
var rand = new Random();
for (int i = 0; i < 15; i++)
{
GridData.Add(new Employee()
{
EmployeeId = i,
Name = "Employee " + i.ToString(),
Team = "Team " + i % 3,
IsOnLeave = i % 2 == 0
});
}
}
public class Employee
{
public int EmployeeId { get; set; }
public string Name { get; set; }
public string Team { get; set; }
public bool IsOnLeave { get; set; }
}
}