When you resize grid columns the column width does not follow the mouse. This occurs in your demo:
https://demos.telerik.com/blazor-ui/grid/column-resizing
Make a column wider or narrower and the column width does not stay in line with where the mouse is.
asynct Task ContextMenuClick(ContextMenuItem) {
var state = Grid.GetState(); state.FilterDescriptors.Add(new FilterDescriptor { Member = "Created", Operator = FilterOperator.IsEqualTo, Value = "Administrator" }); await Grid.SetState(state);
}
How it should look like:
With a pageable grid after scrolling down the first page and then paging, the next page should be scrolled to the top - but it is not.
Is there a way to scroll up by code until this is fixed ???
When using row virtualization, the visible rows are miscalculated when the browser zoom is used (hold control with mouse scroll).
The result of the miscalculation is that the first row at some point is not visible.
To reproduce the problem you should scroll to the top of the grid and see the first row.
Then start to zoom down and see how the first row is displaced.
Seems like only 50%, 100%, 150%, 200% (multiply of 50%) are calculated correctly in row virtualization
<AdminEdit>
You can reproduce the bug with the attached code.
It's browser-specific and is appearing only in chromium browsers.
It could be related to the way browsers calculate the size of the elements when zooming.
Currently, there is an open bug in the chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=1048147&q=component%3AUI%3EBrowser%3EZoom%20height&can=2
</AdminEdit>
Data load in background thread with selected row on UI crashing application when there is selection
1. Select a row
2. Click the button
3. check the server console and/or try to do something else
@using System.Collections.ObjectModel
<TelerikGrid @ref="@Grid"
Data="@GridData"
SelectionMode="@GridSelectionMode.Single"
OnRowClick="@OnRowClickHandler"
@bind-SelectedItems="@SelectedData"
EditMode="@GridEditMode.Incell"
Resizable="true"
Width="100%"
Height="200px"
Reorderable="true"
Groupable="false"
ShowColumnMenu="false"
FilterMode="@GridFilterMode.None"
Sortable="true">
<GridColumns>
<GridColumn Field=@nameof(ViewModel.Name) Editable="false">
</GridColumn>
</GridColumns>
</TelerikGrid>
<TelerikButton OnClick="RefreshButtonClick">Refresh</TelerikButton>
@code {
private const int RowHeight = 40;
private const string Height = "700px";
private const int PageSize = 20;
private ObservableCollection<ViewModel> GridData { get; set; } = new ObservableCollection<ViewModel>();
private IEnumerable<ViewModel> SelectedData { get; set; } = Enumerable.Empty<ViewModel>();
private TelerikGrid<ViewModel> Grid { get; set; }
protected override async Task OnInitializedAsync()
{
await LoadData();
await base.OnInitializedAsync();
}
async Task LoadData()
{
var data = Enumerable.Range(1, 5).Select(x => new ViewModel { Name = $"name {x}" });
GridData = new ObservableCollection<ViewModel>(data);
}
private async Task RefreshButtonClick()
{
Console.WriteLine("reload data");
// spawn a new thread, a Timer will do as well
await Task.Run(() =>
{
IEnumerable<ViewModel> data = new List<ViewModel> { new ViewModel { Name = "1" }, new ViewModel { Name = "2" }, new ViewModel { Name = "3" } };
this.GridData.Clear();
this.GridData.AddRange(data);
});
}
private void OnRowClickHandler(GridRowClickEventArgs args)
{
Console.WriteLine("click to select");
ViewModel viewModel = (ViewModel)args.Item;
//this is here because of theincell editing, not relevant to the issue
SelectedData = new List<ViewModel>() { viewModel };
}
public class ViewModel
{
public ViewModel()
{
}
private string name;
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
}
}
Hi,
Please simplify customizing Grid Popup, it should be available under Grid with build-in context and binding
I am already using your do-it-yourself example but IMHO it is too much code
Regards
Andrzej
Hi,
I'm testing the grid on mobile and I've noticed that the pager can end up being cut off the edge of the screen. The app is designed to not allow scrolling in the HTML window but it does allowing scrolling in the grid (and navbar). This works, but the pager is cutting off. Is there any way it can be made more responsive or made to wrap in a relatively neat way without breaking the control?
See attached image.
Thanks,
Nick
Like this (example taken from "https://demos.telerik.com/aspnet-mvc/grid/editing-custom-validation"):
---
ADMIN EDIT
Here is a workaround - using a bit of JS to clear the checked state of the checkbox element when you clear the SelectedItems collection:
@inject IJSRuntime _js
@*You should move this to a proper place for scripts,
suppressing the error like this is just a hack to keep this sample code concise*@
<script suppress-error="BL9992">
function uncheckGrid(parentElem) {
var checkboxes = parentElem.querySelectorAll(".k-checkbox.k-grid-checkbox");
for (var i = 0; i < checkboxes.length; i++) {
checkboxes[i].checked = false;
}
}
</script>
<div @ref="@ParentElem">
<TelerikGrid Data=@GridData
SelectionMode="@GridSelectionMode.Multiple"
SelectedItemsChanged="@((IEnumerable<Employee> employeeList) => OnSelect(employeeList))"
SelectedItems="@SelectedEmployees"
Pageable="true"
Height="400px">
<GridColumns>
<GridCheckboxColumn />
<GridColumn Field=@nameof(Employee.Name) />
<GridColumn Field=@nameof(Employee.Team) Title="Team" />
</GridColumns>
</TelerikGrid>
</div>
@if (SelectedEmployees != null)
{
<ul>
@foreach (Employee employee in SelectedEmployees)
{
<li>
@employee.Name
</li>
}
</ul>
}
@code {
ElementReference ParentElem { get; set; }
public List<Employee> GridData { get; set; }
public IEnumerable<Employee> SelectedEmployees { get; set; } = Enumerable.Empty<Employee>();
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 void OnSelect(IEnumerable<Employee> employees)
{
bool flag = true;
foreach (Employee item in employees)
{
if(item.EmployeeId % 3 == 0)
{
flag = false;
}
}
if (flag)
{
SelectedEmployees = employees;
}
else
{
SelectedEmployees = Enumerable.Empty<Employee>();
_js.InvokeVoidAsync("uncheckGrid", ParentElem);
}
}
public class Employee
{
public int EmployeeId { get; set; }
public string Name { get; set; }
public string Team { get; set; }
}
}
---
I am using EF on my backend and when I group I get an error like this one:
Unhandled exception rendering component: Processing of the LINQ expression '(GroupByShaperExpression:
KeySelector: (t.FirstName),
ElementSelector:(EntityShaperExpression:
EntityType: Customer
ValueBufferExpression:
(ProjectionBindingExpression: EmptyProjectionMember)
IsNullable: False
)
)' by 'RelationalProjectionBindingExpressionVisitor' failed. This may indicate either a bug or a limitation in EF Core. See https://go.microsoft.com/fwlink/?linkid=2101433 for more detailed information.
System.InvalidOperationException: Processing of the LINQ expression '(GroupByShaperExpression:
KeySelector: (t.FirstName),
ElementSelector:(EntityShaperExpression:
EntityType: Customer
ValueBufferExpression:
(ProjectionBindingExpression: EmptyProjectionMember)
IsNullable: False
)
)' by 'RelationalProjectionBindingExpressionVisitor' failed. This may indicate either a bug or a limitation in EF Core. See https://go.microsoft.com/fwlink/?linkid=2101433 for more detailed information.
at Microsoft.EntityFrameworkCore.Query.Internal.RelationalProjectionBindingExpressionVisitor.VisitExtension(Expression extensionExpression)
at System.Linq.Expressions.Expression.Accept(ExpressionVisitor visitor)
and a lot more line through the EF Core expression classes.
-----
ADMIN EDIT
At the moment, it looks like there is an issue between EF, LINQ and GroupBy expressions that seems to be the origin of this. In a profiler, you can see that running a group expression does not even run a query against the database itself - this is the origin of the problem, and the subsequent paging operation is where an actual exception is thrown, but it points to the field that was used for grouping. protected override void OnInitialized()
{
GridData = ProductService.GetProducts().ToList();
}
----
Using the Excel Export for Grid creates the Excel file, but on opening it, the columns that contain data are hidden. Unless I unhide the columns, the sprceadsheet looks empty.
---I would like the grid to behave like Excel for editing, and so I am using the InCell editing mode. I would like that pressing Tab would open the next cell in the row instead of moving the focus to the next focusable element.
---
ADMIN EDIT
The feature is rather complex and we want to make sure it is done right. To this end, we have postponed its implementation for the year 2021 instead of the November 2020 release. When a concrete release is known, this page will be updated. To get notifications for that, click the Follow button.
---
I need to know which cell the user right clicked on so I can adjust my context menu. I need the cell value, the row model and the field of the column.
---
ADMIN EDIT
The following KB article shows a solution you can use immediately: https://docs.telerik.com/blazor-ui/knowledge-base/grid-which-cell-context-menu.
---
My grid starts with Groupable=false and at some point I may need to make it groupable. The group panel appears, but I cannot drag the column headers to it to actually group.
---
ADMIN EDIT
A workaround is to hide the grid so it can re-initialize with the new groupable setting:
Is Groupable: @IsGroupable
<TelerikButton OnClick="@ToggleGroupable">Toggle Groupable</TelerikButton>
@if (isGridVisible)
{
<TelerikGrid Data=@GridData @ref="@GridRef" Groupable="@IsGroupable" Pageable="true" Height="400px">
<GridColumns>
<GridColumn Field=@nameof(Employee.Name) Groupable="false" />
<GridColumn Field=@nameof(Employee.Team) Title="Team" />
<GridColumn Field=@nameof(Employee.IsOnLeave) Title="On Vacation" />
</GridColumns>
</TelerikGrid>
}
@code {
bool IsGroupable { get; set; }
bool isGridVisible { get; set; } = true;
TelerikGrid<Employee> GridRef { get; set; }
async Task ToggleGroupable()
{
//save state (sorting, paging,...) - it will be lost when we hide the grid
var state = GridRef.GetState();
//hide the grid so it can later re-initialize with the new groupable setting
isGridVisible = false;
await InvokeAsync(StateHasChanged);
await Task.Delay(20);
IsGroupable = !IsGroupable;
isGridVisible = true;
//afte the grid re-initialized and rendered with the new setting, restore its state
await InvokeAsync(StateHasChanged);
await Task.Delay(20);
await GridRef.SetState(state);
}
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; }
}
}
---