Hi, 

I couldn't find any articles about customizing Telerik components with additional properties,
but want to add my own property directly to a Telerik component, like this:
<TelerikWindow MyOwnProperty="SomeValue" />

I would like to avoid creating a custom wrapper component where I would use the Telerik component inside.
Is there any way to achieve this directly with Telerik components without having to wrap them?

Huge thanks for your response,
Bohdan

I want to have a MultiSelect experience for a field in a ListView editor. I'd like the binding to work with the model's navigation collection instead of an ancillary Id collection.

Take the following example where we have a ListView of Appointments. An Appointment has a collection of Contacts called Attendees that we want to manage on Create and Edit with a MultiSelect.

TelerikMultiSelect doesn't like a bind-value with a collection of objects - it wants Ids. One way to solve this could be to do gymnastics with an extra AttendeeIds collection on the Appointment and synchronize that collection with the navigation entities on read/create/update. Is there a way to avoid the gymnastics and solve this case more directly? 

Can you provide an example? Thanks.

<TelerikListView TItem="Appointment"...>
...
<EditTemplate>
                        <TelerikMultiSelect Data="@Contacts" Placeholder="Select attendees" AutoClose="false"
                                            @bind-Value="@context.Attendees" <-this does not work
                                            TextField="@nameof(Contact.Name)" ValueField="@nameof(Contact.Id)"
                                            DebounceDelay="0" />
</EditTemplate>
...
</TelerikListView>

List<Contact> Contacts {get; set;} =[]; //loaded in oninitializeasync

public class Appointment {
  public Guid Id {get; set;}
  public List<Contact> Attendees {get; set;}
}

public class Contact {
  public Guid Id {get; set;}
  public string Name {get; set;}
}
...

I'm receiving the following error when I tab from the last row in group to the next group.

Unhandled exception rendering component: No parameterless constructor defined for type 'Telerik.Blazor.Components.Grid.Grouping.GridGroup'.
System.MissingMethodException: No parameterless constructor defined for type 'Telerik.Blazor.Components.Grid.Grouping.GridGroup'.

Here is my grid.

 <TelerikGrid @ref="@TheGrid" Data="Mappings"
              Groupable="true"
              OnStateInit="@((GridStateEventArgs<object> args) => OnStateInitHandler(args))"
              OnRead="@ReadHandler"
              OnUpdate="@UpdateHandler"
              EditMode="@GridEditMode.Incell"
              Pageable="true"
              PageSize="15" RowHeight="32"
              Navigable="true" Sortable="true">
     <GridToolBarTemplate>
         <GridSearchBox Width="200px"></GridSearchBox>
         <span class="k-toolbar-spacer"></span>
         <GridCommandButton Command="ExcelExport" Icon="@SvgIcon.FileExcel">Export to Excel</GridCommandButton>
         <GridCommandButton Command="CsvExport" Icon="@SvgIcon.FileCsv">Export to CSV</GridCommandButton>
     </GridToolBarTemplate>
     <GridColumns>
         <GridColumn Field="@nameof(SiteMappingDto.SiteName)" FieldType="@typeof(string)" Title="Site" Editable="false" />
         <GridColumn Field="@nameof(SiteMappingDto.SiteReference)" FieldType="@typeof(string)" Title="Reference" Editable="false" />
         <GridColumn Field="@nameof(SiteMappingDto.TagName)" FieldType="@typeof(string)" Title="Tag" Editable="false" />
         <GridColumn Field="@nameof(SiteMappingDto.TagDescription)" FieldType="@typeof(string)" Title="Description" Editable="false" />
         <GridColumn Field="@nameof(SiteMappingDto.MappingValue)" FieldType="@typeof(string)" Title="Value" Editable="true" />
     </GridColumns>
 </TelerikGrid>

And the dto used:
 public class SiteMappingDto
 {
     public SiteMappingDto()
     {
     
     }

     public int Id { get; set; }
     public string? SiteName { get; set; }
     public string? SiteReference { get; set; }
     public string? TagName { get; set; }
     public string? TagDescription { get; set; }
     public int TagOrder { get; set; }
     public string? MappingValue { get; set; }
 }

Hi, here's the scenario.

The time picker defaults to 0:00:00 <TimeOnly>:

 <TelerikTimePicker ID="txtPlayStart"
 @bind-Value="Value.playStart"
 Format="H:mm:ss"
 T="TimeOnly"
 ShowClearButton="true"/>

the user enters a time, saves it, all is well.

He realizes later he entered a bad time and wants to clear it.

He clicks the clear button, and saves it.

Imagine his surprise when nothing changes?

clear doesn't set it back to the default of 0:00:00?  there's a visual cue for the user (control is in red), but forcing them to enter 0:00:00 is not really appropriate?

Furthermore, if I catch the OnChange event, it fires when the user clicks the clear button, and it says the time is what it was before the user clicked clear. :/

I'm using the 7.1.0 that just came out yesterday.

I'm coming to realize that many of the Telerik Blazor components are pretty "bare bone" and some some sort of developer wrapper is required to make them user friendly.  (Except for "big" ones like the grid.)  Is that intentional?

I'm not seeing a way around this short of using the code and building my own custom version that I then have to keep up to date with every new release?

Thanks,

Charles

I'm working from this demo to use NoDataTemplate with a TelerikChart. The demo works for me in the link but locally, the NoDataTemplate is always visible regardless of whether there's data in the chart. I copied the files from that demo to a test project and still can't get the NoDataTemplate to disappear.

I have the test project here and the chart is in the Test.razor page.

I want to show a series of pie charts but with the series labels on top of each section like so:

I haven't found anything that suggests the labels can be anywhere except attached by lines. Is this possible?

Hi, sorry if this is a basic question, but I cannot for the life of me figure out how to get this to work. I can have a DropDown list and a form separately, but when I try to put the DropDown into the form itself, I get a "Object of type 'Telerik.Blazor.Components.FormItem' does not have a property matching the name 'ChildContent'" error.

Here's a sample snippet of what I'm trying to do:

 <TelerikForm Model="@Input"
             Columns="3"
             ColumnSpacing="50px"
             OnValidSubmit="@HandleValidSubmit"
             OnInvalidSubmit="@HandleInvalidSubmit">
    <FormValidation>
        <DataAnnotationsValidator />
    </FormValidation>
    <FormItems>

<FormItem Field="@nameof(Model.Attribute)"></FormItem>
<FormItem Field="@nameof(Model.Attribute2)">
    <TelerikDropDownList Data="@myDdlData"
                         TextField="MyTextField"
                         ValueField="MyValueField"
                         @bind-Value="Model.Attribute3">
    </TelerikDropDownList>
</FormItem>
<FormItem Field="@nameof(Model.Attribute4)"></FormItem>

            </FormItems>
        </TelerikForm>

I'm trying to figure out how to autofit a column in a nested grid.

In the Detail Template of a grid (Grid A), there is a another grid (Grid B). This nested grid (Grid B) has a column that shows the selections from a MultiSelect component. This could be a single value or multiple values. I know that there are methods that resize a column based on the column id or resize multiple columns, but these methods require a grid object reference. Since this nested grid (Grid B) is templated and therefore has multiple instances, I can't directly get a reference to it.

Also, it seems that all the relevant Grid event handlers only have arguments return references to the data bound to the grid, but not a reference to the grid object.

Is there a way to get a reference to a specific grid instance in a Detail Template or is there another way to auto size a specific column in a nested grid?

Thanks