Hi
I would like a "Steper" as the one you have in your MVC product.
Hello,
Please add an expandable and collapsible panel (container), similar to the ExpansionPanel in Kendo UI.
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Hello
The column group headers functionality is great, however it messes with the export to excel/csv, as the headers no longer align on the 1 row.
Just seeing if there was a way to export to csv/excel but ignore the column group headers? Maybe a feature on the <GridCsvExport ExportGroupHeaders=false /> option?
Or is there a way to turn off column group headers programmatically? Then this could be removed then readded on the events; OnBeforeExport, OnAfterExport
Cheers
Phil
When downloading files via the TelerikPdfViewer bytes are added before and after the PDF Dokument.
Browsers are able to show the documents but you get and error message if you try to open the downloaded document in Acrobar Reader or in a DMS.
The document attached was download from the demo on your web site.
I would really be happy to see your WPF Diagram Control (https://www.telerik.com/products/wpf/diagrams.aspx) ported to Blazor.
Do you have any plans to do so?
At the moment, dropdown and popups (like the DatePicker and DropDownList) render in the place of declaration, and CSS rules from their parent elements affect them heavily (for example, they are hidden behind grid cells when used as custom editors).
The popups should be detached and rendered higher in the DOM if possible, so they don't get confined in their parent like that. This may be applicable for more components as well.
All controls (such as TelerikGrid, TelerikDropDownList, etc) should have a "Visible" property. This bindeable boolean value controls whether the control is visible on the page or not:
<TelerikGrid Visible="@IsVisible" />
@functions {
protected bool IsVisible
}
This is a much better method than surrounding the entire control's markup in an @if(IsVisible) block, since that causes the control to get removed/added to the dom at runtime. This can cause many issues such as the control's constructors being fired multiple times, the dom getting "jiggled" about unecessarily.
I feel the "Visible" property is a cleaner way to hide controls.
This is more or less a question and request.
With the new "Lazy Loading" feature of Blazor .Net 5, is it possible that Telerik can use this feature internally, to load only components/library as the app needs it at runtime to save initial load time?
Thanks!
It stops working if you open it too fast. It goes into a state where no matter what you do (Rebind/changing data bound values etc.), it will not open and show items.
It can be reproduced easily by calling .Open() in OnInitializedAsync()
I have reproduced it without MS Playwright in REPL, so you can easily debug it.
https://blazorrepl.telerik.com/QIOUYoPc57iQKy6702
If you uncomment the await Task.Delay(3000); the code will work.
Expected behavior:
It is ok that Open() does nothing while the control is initializing. It is not ok that just because you called Open() once, then you are forever stuck without being able to open it later, no matter how long you wait or what you do with the items.
I do not want to insert random Delays in my code either as I expect the TelerikDropDownList to not malfunction just because I open it too early.
I hope you can prioritize this as right now the DropDownList is not usable for us.
Please add group header template for the select components. There are two goals:
- Customize the group items' appearance.
- Implement custom behaviors, for example - batch select or unselect of all items in the group by clicking on the group header.
Greetings,
I am curious if you intend on offering any means of control for the height of an appointment cell within the scheduler. For us it is in the Timeline view with Resources. I have downloaded the source code and implemented the functionality myself and am willing to share my changes. It ultimately performs three functions:
1. Creates a new parameter on the SchedulerTimeViewBase.cs so that it is end user facing.
2. Alters the code in the ContentTableBase.cs to assign the AllDayAppointmentOuterHeight property with this new parameter's value (plus 1).
3. Alters the AppointmentRendererBase.cs to assign the AllDayAppointmentHeight property with this new parameter's value.
Additional changes are necessary to the Models and Interfaces.
We have used the JS version of this for several years and need the additional real estate on the scheduler. This is the only means that I could figure to alter the height as the position of the cells and resource rows are computed on the back end. Any alterations using a CSS class during OnItemRender will produce cells that overlap each other and/or overflow to subsequent rows.
As a user, I would like to ability to pin one to many row(s) in a grid so that the pinned rows are always the first rows at the top of the grid.
If a filter is applied, the pinned records that match the filter should be displayed first. Non matching rows may be hidden.
If a column sort is changed, the pinned rows should be sorted then the unpinned rows should be sorted to ensure the pinned rows are always at the top of the grid.
As a developer, Pinning should be a optional feature configured when the grid is setup.
This essentially would only add a data populated "pin" column the user can toggle on or off, but the real effort in this request is around the sorting and filtering to ensure when the user clicks a column the event is captured, and the sort is submitted as pin column, then the selected column, to ensure the pin takes precedent.
In many cases in a grid you may have additional data that the user can view however you don't want to show it as a default.
In these cases it would be nice to create the column normally, set the visible="false", and then have a built in column chooser feature.
This chooser would be a simple popup with a list of columns where the user can check whether visible or not.
We find this in our infrastructure but it can be reproduced even in Telerik docs.
Docs page: https://docs.telerik.com/blazor-ui/components/grid/grouping/overview try to drop all three columns using drag and drop in sequence: Team, Name, On Vacation.
Expected sequence: Team, Name, On Vacation
Expected sequence: Team, On Vacation, Name
All Elements are always added as 1 item. It is an important feature for us, as our customers use it frequently.
===
TELERIK EDIT:
A possible workaround is to intercept the grouping and reorder the groups:
@using Telerik.DataSource
<p>Group by a third column, so that it should come last in the Group Panel:</p>
<TelerikGrid @ref="@GridRef"
Data="@GridData"
Pageable="true"
Sortable="true"
Groupable="true"
FilterMode="GridFilterMode.FilterRow"
OnStateInit="@( (GridStateEventArgs<Employee> args) => OnGridStateInit(args) )"
OnStateChanged="@( (GridStateEventArgs<Employee> args) => OnGridStateChanged(args) )">
<GridColumns>
<GridColumn Field="@nameof(Employee.Name)" />
<GridColumn Field="@nameof(Employee.Team)" />
<GridColumn Field="@nameof(Employee.Salary)" />
<GridColumn Field="@nameof(Employee.OnVacation)" />
</GridColumns>
</TelerikGrid>
@code {
private TelerikGrid<Employee>? GridRef { get; set; }
private List<Employee> GridData { get; set; } = new();
private void OnGridStateInit(GridStateEventArgs<Employee> args)
{
args.GridState.GroupDescriptors = new List<GroupDescriptor>();
args.GridState.GroupDescriptors.Add(new GroupDescriptor()
{
Member = nameof(Employee.Team),
MemberType = typeof(string)
});
args.GridState.GroupDescriptors.Add(new GroupDescriptor()
{
Member = nameof(Employee.OnVacation),
MemberType = typeof(bool)
});
}
private async Task OnGridStateChanged(GridStateEventArgs<Employee> args)
{
if (args.PropertyName == "GroupDescriptors" && args.GridState.GroupDescriptors.Count > 2 && GridRef != null)
{
var secondGroupDescriptor = args.GridState.GroupDescriptors.ElementAt(1);
args.GridState.GroupDescriptors.Remove(secondGroupDescriptor);
args.GridState.GroupDescriptors.Add(secondGroupDescriptor);
await GridRef.SetStateAsync(args.GridState);
}
}
protected override void OnInitialized()
{
var rnd = new Random();
for (int i = 1; i <= 20; i++)
{
GridData.Add(new Employee()
{
Id = i,
Name = "Name " + i,
Team = "Team " + (i % 4 + 1),
Salary = (decimal)rnd.Next(1000, 3000),
OnVacation = i % 3 == 0
});
}
}
public class Employee
{
public int Id { get; set; }
public string Name { get; set; } = string.Empty;
public string Team { get; set; } = string.Empty;
public decimal Salary { get; set; }
public bool OnVacation { get; set; }
}
}
When you have LazyLoading() enabled on an EF context, the grid throws errors similar to
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NotImplementedException: This is a DynamicProxy2 error: The interceptor attempted to 'Proceed' for method 'Void set_LazyLoader(Microsoft.EntityFrameworkCore.Infrastructure.ILazyLoader)' which has no target.
Here is a sample of the service registration that causes the issue
services.AddDbContext<ApplicationDbContext>(options =>
options
.UseLazyLoadingProxies() // this causes the problem
.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")), ServiceLifetime.Transient);
Here is the full stack trace
Microsoft.AspNetCore.Components.Server.Circuits.RemoteRenderer: Warning: Unhandled exception rendering component: Object reference not set to an instance of an object.System.NullReferenceException: Object reference not set to an instance of an object.
at Telerik.Blazor.Components.Grid.GridContentCell`1.get_PropInfo()
at Telerik.Blazor.Components.Grid.GridContentCell`1.get_Value()
at Telerik.Blazor.Components.Grid.GridContentCell`1.BuildRenderTree(RenderTreeBuilder __builder)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderInExistingBatch(RenderQueueEntry renderQueueEntry)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost: Error: Unhandled exception in circuit '-ctJ-ctr0bp4mytl5k9AxUWcoK3LyC8ybsC6BxFhGhA'.
System.NullReferenceException: Object reference not set to an instance of an object.
at Telerik.Blazor.Components.Grid.GridContentCell`1.get_PropInfo()
at Telerik.Blazor.Components.Grid.GridContentCell`1.get_Value()
at Telerik.Blazor.Components.Grid.GridContentCell`1.BuildRenderTree(RenderTreeBuilder __builder)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderInExistingBatch(RenderQueueEntry renderQueueEntry)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
[2020-01-31T17:09:22.390Z] Error: System.NullReferenceException: Object reference not set to an instance of an object.
at Telerik.Blazor.Components.Grid.GridContentCell`1.get_PropInfo()
at Telerik.Blazor.Components.Grid.GridContentCell`1.get_Value()
at Telerik.Blazor.Components.Grid.GridContentCell`1.BuildRenderTree(RenderTreeBuilder __builder)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderInExistingBatch(RenderQueueEntry renderQueueEntry)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
[2020-01-31T17:09:22.393Z] Information: Connection disconnected.
Microsoft.AspNetCore.Components.Server.Circuits.RemoteRenderer: Warning: Unhandled exception rendering component: Exception has been thrown by the target of an invocation.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.NotImplementedException: This is a DynamicProxy2 error: The interceptor attempted to 'Proceed' for method 'Void set_LazyLoader(Microsoft.EntityFrameworkCore.Infrastructure.ILazyLoader)' which has no target. When calling method without target there is no implementation to 'proceed' to and it is the responsibility of the interceptor to mimic the implementation (set return value, out arguments etc)
at Castle.DynamicProxy.AbstractInvocation.ThrowOnNoTarget()
at Castle.DynamicProxy.Internal.CompositionInvocation.EnsureValidTarget()
at Castle.Proxies.Invocations.IProxyLazyLoader_set_LazyLoader.InvokeMethodOnTarget()
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at Castle.DynamicProxy.StandardInterceptor.PerformProceed(IInvocation invocation)
at Castle.DynamicProxy.StandardInterceptor.Intercept(IInvocation invocation)
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at Castle.Proxies.AttivitaProxy.set_LazyLoader(ILazyLoader value)
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
at Telerik.Blazor.Components.TelerikGridBase`1.Clone(TItem original)
at Telerik.Blazor.Components.TelerikGridBase`1.Edit(GridCommandEventArgs args)
at Telerik.Blazor.Components.TelerikGridBase`1.ExecuteCommand(Object args)
at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
at Telerik.Blazor.Components.Grid.GridRowBase`1.OnExecuteCommand(GridCommandEventArgs commandArgs)
at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
at Telerik.Blazor.Components.Grid.GridContentCell`1.ExecuteCommandAsync(String commandName)
at Telerik.Blazor.Components.Grid.GridContentCell`1.EditAsync()
at Telerik.Blazor.Components.Grid.GridContentCell`1.OnClick()
at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle)
Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost: Error: Unhandled exception in circuit '-ctJ-ctr0bp4mytl5k9AxUWcoK3LyC8ybsC6BxFhGhA'.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.NotImplementedException: This is a DynamicProxy2 error: The interceptor attempted to 'Proceed' for method 'Void set_LazyLoader(Microsoft.EntityFrameworkCore.Infrastructure.ILazyLoader)' which has no target. When calling method without target there is no implementation to 'proceed' to and it is the responsibility of the interceptor to mimic the implementation (set return value, out arguments etc)
at Castle.DynamicProxy.AbstractInvocation.ThrowOnNoTarget()
at Castle.DynamicProxy.Internal.CompositionInvocation.EnsureValidTarget()
at Castle.Proxies.Invocations.IProxyLazyLoader_set_LazyLoader.InvokeMethodOnTarget()
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at Castle.DynamicProxy.StandardInterceptor.PerformProceed(IInvocation invocation)
at Castle.DynamicProxy.StandardInterceptor.Intercept(IInvocation invocation)
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at Castle.Proxies.AttivitaProxy.set_LazyLoader(ILazyLoader value)
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
at Telerik.Blazor.Components.TelerikGridBase`1.Clone(TItem original)
at Telerik.Blazor.Components.TelerikGridBase`1.Edit(GridCommandEventArgs args)
at Telerik.Blazor.Components.TelerikGridBase`1.ExecuteCommand(Object args)
at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
at Telerik.Blazor.Components.Grid.GridRowBase`1.OnExecuteCommand(GridCommandEventArgs commandArgs)
at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
at Telerik.Blazor.Components.Grid.GridContentCell`1.ExecuteCommandAsync(String commandName)
at Telerik.Blazor.Components.Grid.GridContentCell`1.EditAsync()
at Telerik.Blazor.Components.Grid.GridContentCell`1.OnClick()
at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle)
Steps to reproduce this are pretty simple. On the Blazor Wizard demo at this link:
- Enter a password on step 1
- Click 'Next' to bring you to the 'Shipping' step
- Set focus to the 'City' input box. I clicked to the end of the default string that is pre-populated as 'Torino'
- Press the left arrow key. This sends you back to Step 1 (Registration)
This is a pretty big stumbling block for using the Wizard component, but I may be missing some kind of setting or code that will resolve this.
I am experiencing this problem with version 2.29 when the dropdown list is in a "component"
It seems to be intermittent but dependent on how long the async method takes to complete.
Edit page
@page "/"
@using System.Diagnostics
@using System.Threading
@using BlazorApp1.Components
<h1>Hello, world!</h1>
<EditForm class="form-inline" Model="@Model">
<MyComponent />
</EditForm>
Welcome to your new app.
@code {
object Model = new();
private Guid InstanceId;
public Index()
{
InstanceId = Guid.NewGuid();
Debug.WriteLine($"Index - {InstanceId}");
}
protected override Task OnInitializedAsync()
{
Debug.WriteLine("Index - OnInitializedAsync");
return base.OnInitializedAsync();
}
protected override Task OnParametersSetAsync()
{
Debug.WriteLine("Index - OnParametersSetAsync");
return base.OnParametersSetAsync();
}
}
Component
@using System.Diagnostics
<h3>My Component</h3>
<br />
<TelerikDropDownList @bind-Value=_selectedValue Data="@myComboData" TextField="MyTextField" ValueField="MyValueField" TValue="int" TItem="MyDdlModel"></TelerikDropDownList>
<br />
<TelerikButton OnClick="@SayHelloHandler" Primary="true">Say Hello</TelerikButton><br />
@helloString
<br />
@code {
private Guid InstanceId;
MarkupString helloString;
int _selectedValue { get; set; } = 2; // Preselected value
IEnumerable<MyDdlModel> myComboData { get; set; } = Enumerable.Empty<MyDdlModel>();
void SayHelloHandler()
{
string msg = string.Format("Hello from <strong>Telerik Blazor</strong> at {0}.<br /> Now you can use C# to write front-end!", DateTime.Now);
helloString = new MarkupString(msg);
}
public MyComponent()
{
InstanceId = Guid.NewGuid();
Debug.WriteLine($"MyComponent - {InstanceId}");
}
protected override async Task OnInitializedAsync()
{
Debug.WriteLine("MyComponent - OnInitializedAsync");
myComboData = await LoadData();
await base.OnInitializedAsync();
}
protected override Task OnParametersSetAsync()
{
Debug.WriteLine("MyComponent - OnParametersSetAsync");
return base.OnParametersSetAsync();
}
private async Task<IEnumerable<MyDdlModel>> LoadData()
{
await Task.Delay(100);
return Enumerable.Range(1, 20).Select(x => new MyDdlModel { MyTextField = "item " + x, MyValueField = x });
}
public class MyDdlModel
{
public int MyValueField { get; set; }
public string MyTextField { get; set; }
}
}
