You may get an exception like

InvalidOperationException: The current thread is not associated with the Dispatcher. Use Invoke() or InvokeAsync() to switch execution to the Dispatcher when triggering rendering or modifying any state accessed during rendering.

or you may get components that simply don't work (for example, a Window does not show, a treeview does not expand).

The solution is to revert to the RenderComponentAsync method in your _Hosts.cshtml file.

What about supporting INotifyCollectionChanged data source for the Grid?

When trying to create a treeview inside of another treeview template I get the following error

[2019-07-19T00:58:28.003Z] Error: System.InvalidOperationException: Object of type 'Telerik.Blazor.Components.TreeView.TelerikTreeView' does not have a property matching the name 'ChildContent'.

   at Microsoft.AspNetCore.Components.ParameterCollectionExtensions.ThrowForUnknownIncomingParameterName(Type targetType, String parameterName)

   at Microsoft.AspNetCore.Components.ParameterCollectionExtensions.SetParameterProperties(ParameterCollection& parameterCollection, Object target)

   at Microsoft.AspNetCore.Components.ComponentBase.SetParametersAsync(ParameterCollection parameters)

   at Telerik.Blazor.Components.TreeView.TelerikTreeViewBase.SetParametersAsync(ParameterCollection parameters)

   at Microsoft.AspNetCore.Components.Rendering.ComponentState.SetDirectParameters(ParameterCollection parameters)

   at Microsoft.AspNetCore.Components.Rende...

A Gantt Chart is one big thing missing that is always high on my blazor UI wish list.

Kind regards,

Kay

---

ADMIN EDIT

For the time being, a workaround could be to wrap a JS widget, an example is available in this sample project, see the MyKendoGantt.razor component.

---

It would be great if the controls supported arbitrary attributes. Similar to how it is done in the native form editing controls in Blazor framework.

ASP.NET Core Blazor forms and validation

"All of the input components, including EditForm, support arbitrary attributes. Any attribute that doesn't match a component parameter is added to the rendered HTML element."

After upgrading from 1.1.1 to 1.2.0 I get following exception on app start when hosted on azure app service, locally it works fine.

I have tried using the "static assets" and "CDN" version for retrieving the .js file, both yield this error.

An error occurred while starting the application.
DirectoryNotFoundException: C:\Users\VssAdministrator\.nuget\packages\telerik.ui.for.blazor.trial\1.2.0\staticwebassets\

Microsoft.Extensions.FileProviders.PhysicalFileProvider..ctor(string root, ExclusionFilters filters)

    DirectoryNotFoundException: C:\Users\VssAdministrator\.nuget\packages\telerik.ui.for.blazor.trial\1.2.0\staticwebassets\
        Microsoft.Extensions.FileProviders.PhysicalFileProvider..ctor(string root, ExclusionFilters filters)
        Microsoft.Extensions.FileProviders.PhysicalFileProvider..ctor(string root)
        Microsoft.AspNetCore.StaticWebAssetsFileProvider..ctor(string pathPrefix, string contentRoot)
        Microsoft.AspNetCore.StaticWebAssetsLoader+<>c.<UseStaticWebAssetsCore>b__2_0(ContentRootMapping cr)
        System.Linq.Enumerable+SelectEnumerableIterator<TSource, TResult>.MoveNext()
        System.Linq.Enumerable.OfTypeIterator<TResult>(IEnumerable source)+MoveNext()
        System.Collections.Generic.List<T>..ctor(IEnumerable<T> collection)
        System.Linq.Enumerable.ToList<TSource>(IEnumerable<TSource> source)
        Microsoft.AspNetCore.StaticWebAssetsLoader.UseStaticWebAssetsCore(IWebHostEnvironment environment, Stream manifest)
        Microsoft.AspNetCore.StaticWebAssetsLoader.UseStaticWebAssets(IWebHostEnvironment environment)
        Microsoft.AspNetCore.WebHost+<>c.<ConfigureWebDefaults>b__9_0(WebHostBuilderContext ctx, IConfigurationBuilder cb)
        Microsoft.AspNetCore.Hosting.Internal.GenericWebHostBuilder+<>c__DisplayClass8_0.<ConfigureAppConfiguration>b__0(HostBuilderContext context, IConfigurationBuilder builder)
        Microsoft.Extensions.Hosting.HostBuilder.BuildAppConfiguration()
        Microsoft.Extensions.Hosting.HostBuilder.Build()
        *.Program.Main(string[] args) in Program.cs

    System.IO.DirectoryNotFoundException: C:\Users\VssAdministrator\.nuget\packages\telerik.ui.for.blazor.trial\1.2.0\staticwebassets\

       at Microsoft.Extensions.FileProviders.PhysicalFileProvider..ctor(String root, ExclusionFilters filters)

       at Microsoft.Extensions.FileProviders.PhysicalFileProvider..ctor(String root)

       at Microsoft.AspNetCore.StaticWebAssetsFileProvider..ctor(String pathPrefix, String contentRoot)

       at Microsoft.AspNetCore.StaticWebAssetsLoader.<>c.<UseStaticWebAssetsCore>b__2_0(ContentRootMapping cr)

       at System.Linq.Enumerable.SelectEnumerableIterator`2.MoveNext()

       at System.Linq.Enumerable.OfTypeIterator[TResult](IEnumerable source)+MoveNext()

       at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)

       at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

       at Microsoft.AspNetCore.StaticWebAssetsLoader.UseStaticWebAssetsCore(IWebHostEnvironment environment, Stream manifest)

       at Microsoft.AspNetCore.StaticWebAssetsLoader.UseStaticWebAssets(IWebHostEnvironment environment)

       at Microsoft.AspNetCore.WebHost.<>c.<ConfigureWebDefaults>b__9_0(WebHostBuilderContext ctx, IConfigurationBuilder cb)

       at Microsoft.AspNetCore.Hosting.Internal.GenericWebHostBuilder.<>c__DisplayClass8_0.<ConfigureAppConfiguration>b__0(HostBuilderContext context, IConfigurationBuilder builder)

       at Microsoft.Extensions.Hosting.HostBuilder.BuildAppConfiguration()

       at Microsoft.Extensions.Hosting.HostBuilder.Build()

       at *.Program.Main(String[] args) in d:\a\1\s\*\Program.cs:line 11

.NET Core 3.0.0-preview6-27804-01 X86 v4.0.0.0    |   Microsoft.AspNetCore.Hosting version 3.0.0-preview6.19307.2    |    Microsoft Windows 10.0.14393    |   Need help? 

    <input class="form-control" readonly="@(!EditMode)" type="text" @bind="@FormField.TextValue"/>

A text/ html editor similar to asp.net core

https://www.telerik.com/aspnet-core-ui/editor

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.

A basic Menu control is one of the most fundamental common controls ....  Why was it not included in the first release of UI for Blazor???

How about a basic fundamental Menu control in the UI for Blazor?   If not now, when?

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.

Would be great to have a user XML Editor, with input/output from string/stream and an attached XSD for continuous validation?

I realise this wouldn't be priority, just wondered if it could be put on roadmap at some point.

Many thanks,

David Speak.