Good Morning,

I have recently started getting random and repeated Javascript errors when debugging my project using your controls for Blazor.  It is completely random (sometimes happens immediately at project start, sometimes when navigating to a new page, sometimes when interacting with a control).  It is ALWAYS the same error....

TypeError: Cannot read properties of undefined (reading 'visible') 

Message=
  Source=
  StackTrace:
  at __webpack_modules__.8219.constructor.onMouseEnter (https://localhost:44307/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js?v=ITaQSsBTBmdJoUpPr2KiZ7JwhfKjwa7SGa6zvlv9kkU:50:1442661)

I am using the most current version of your product.  I have gone through your "Javascript Errors" page and have worked through all the suggestions.  Nothing resolves it.

This is becoming a giant time sink while trying to work on a project.  What can we do to get appropriate error handling on your end to prevent these issues?

Thanks

I recently had a breakthrough moment in my journey learning and using Telerik Blazor that I believe highlights a crucial area for improvement in your documentation strategy. I believe that this will significantly help me learn and use your components,  I suspect others may still fall into the same trap as me.  I'm confident that implementing this suggestion will make the learning process considerably easier for all users.

As a developer with over 35 years of experience, my initial approach to learning new technologies is to rely heavily on official documentation. I expect to find comprehensive resources that facilitate a smooth learning curve. However, after years of struggling with Telerik Blazor components, I stumbled upon the Component Demos section (https://demos.telerik.com/blazor-ui). This discovery, triggered by a specific Google search for "telerik blazor drawer submenu," is a game-changer.

The Component Demos contain a wealth of practical examples for each component, offering invaluable "cut-and-paste" starting points. Before this, I primarily relied on StackOverflow and other online resources and until today, I finally landed on the Telerik Blazor Component demos. The fact that I have been unaware of this resource for so long represents a significant shortcoming in the current documentation.  How easy it would be to add a link in the overview to the component's demos which would have saved me countless hours of trying to solve problems that have already been solved on the demos page, like the Drawer submenu mentioned above.

   Integrating direct links to each component's respective demo page within the main documentation would dramatically improve the discover-ability of these demos and empower users to independently solve many common challenges. Currently, the limited examples within the documentation are insufficient for comprehensive understanding.

In summary, prominently featuring the Component Demos within the core Telerik Blazor documentation would vastly enhance the learning experience, reduce support requests, and empower developers to utilize the full potential of your components.

Peter

We would like the ability to customize the calendar's month header.

For instance, we would like to add a row displaying the month name and year, as shown in the attached screenshot.

Hi Telerik Support

This is related to the feedback portal item:  The Grid header gets focus only for the first time when tabbing

I had raised the above issue, now I can see that the issue is fixed in 7.0.0. But the fix does not work when the TelerikGrid is inside a TelerikWindow. 

Please find the REPL sample https://blazorrepl.telerik.com/QIvmPrlI39rZ4whP10 

Is there a work around for the scenario where the grid is inside a popup window?

Regards

Bably

On a grid grouped by a field (using GroupDescriptors) where the amount of records exceed the page limit, therefore generating multiple pages, provide an option to keep the collapsed/expanded states of the groups when navigating through the pages.

In-house we implemented the following approach to mitigate this issue: when calling OnRead event, after processing the data (order, filter, group, etc) we're mapping the groups and subgroups to its corresponding indexes. When page changing, we then store the current state of the groups, alongside its keys (aka  the label of the group). After page changing and mapping the groups and subgroups again, we just match the group names stored in this temporary state with the group names of the new page and restore the state.

For example: start with all groups initially collapsed, page 1 has groupA and groupB and user expanded groupB, changed to page 2, which has the remaining records of groupB and groupC. In this case it will restore groupB as expanded while groupC keeps collapsed.

Example to demonstrate the issue: https://blazorrepl.telerik.com/melmEeFi43owNZBe50

On a grid grouped by one or more fields, provide an option for end users to expand/collapse all rows at will. The following image is a suggestion of where this option (most likely a button) should appear:

Hi,

Can I request that the Pdf Viewer:

- Load multiple pdf files on open. Maybe via an array of file names.

     - We use a different viewer due to this capability. For Human Resource files you need the ability to load numerous files into one viewer to show a complete
         document. The current one file option doesn't work for us.

- Display thumbnails of the loaded pages.
      - Thumbnail onclick to move to a specific page.

Regards,
Graham O'Riley

Steps to reproduce:

1. Insert a simple TelerikGrid on your page
2. Add Columns with templates for each property
3. Specify a Column Template

See https://blazorrepl.telerik.com/GyPvFMFr00zLEEdG00

Problem / Inconvenience

• Context has to be converted/cast before access to the each property is possible
• Grid columns are not generic which makes them hard to use sometimes
• Fields have to be specified by name (may lead to wrong names after changing)

Solution / Feature Request

• Provide new generic columns (to ensure no current implementations break)
  
• Add [CascadingTypeParameter(nameof(TItem))] to the TelerikGrid
• GridColumns automatically "inherit" the typeparam TItem
  

Idea from: Blazor QuickGrid

Benefits

• GridColumns can be specified with Expression
• Template context does not have to be cast anymore
• Renaming properties affect expression or an error is display (property does not exist)

<GridColumn For="@(t => t.Name)">
        <Template>
                <div>
                    @item.Name
                </div>
        </Template>
</GridColumn>

I generated a new project using the Telerik Blazor Template for server side.

In the _Host.cshtml file on line 27 it generates the following:

<a href class="reload">Reload</a>

Should be

<a href="" class="reload">Reload</a>

Have a nice day.

Peter

For example, selecting Bootstrap-Main-Dark theme in the Project Wizard does not apply the dark mode.

===ADMIN EDIT===

For the time being, a possible workaround is to manually add class="k-body" to the <body> tag of your application. This will ensure, that the dark mode is correctly applied. This is required because, by design, the Default theme does not enable the typography system. The "k-body" class is required for the typography system to work properly on the document level and apply the predefined typography values to the page. For more detailed information, refer to Design System Documentation.

I am handling the SelecteditemsChanged event of the Grid and when an exception is thrown in its handler, the ErrorBoundarydoes not catch it.

For reference, I tried attaching the same handler to a click of a button and it is successfully caught by the ErrorBoundary in this case.

Further to issue reported in https://feedback.telerik.com/blazor/1545177-selected-items-are-not-preserved-when-loading-the-state-when-the-component-is-bound-to-expandoobjects wrt Expando Object, the column menu reset also does not work when grid is bound to Expando Object

Regards

Naved

When filtering or editing a Grid with enum data, the Name property of their Display parameter is respected.

However, in the initial view mode of the Grid the Name property is not applied and the enum values are rendered regardless of whether or not their Display parameter has a Name property defined.

==========

ADMIN EDIT

==========

In the meantime, a workaround you might try is to create a custom method to check whether Display attribute is defined and get and display its Name property, otherwise display the Enum's member name.

You can then use a Template for the column that uses enum data, cast its context to the model you are using and invoke the method on the field containing the enum. The sample below demonstrates how you can achieve this.

@using System.ComponentModel.DataAnnotations
@using System.Reflection

<TelerikGrid Data=@MyData EditMode="@GridEditMode.Inline" Pageable="true" Height="500px"
             OnUpdate="@UpdateHandler" FilterMode="@GridFilterMode.FilterRow">
    <GridColumns>
        <GridColumn Field=@nameof(SampleData.ID) Editable="false" Title="ID" />
        <GridColumn Field=@nameof(SampleData.Name) Title="Name" />
        <GridColumn Field=@nameof(SampleData.Role) Title="Position">       
            <Template>
                @{
                    var currentEmployee = context as SampleData;
                    var currentRole = GetDisplayName(currentEmployee.Role);                        
                }

                @currentRole
            </Template>
        </GridColumn>
        <GridCommandColumn>
            <GridCommandButton Command="Save" Icon="save" ShowInEdit="true">Update</GridCommandButton>
            <GridCommandButton Command="Edit" Icon="edit">Edit</GridCommandButton>
        </GridCommandColumn>
    </GridColumns>
</TelerikGrid>

@code {
    //custom method to check whether Display attribute is defined and get and display its Name property, otherwise display the Enum's member name
    public string GetDisplayName(Enum val)
    {
        return val.GetType()
                  .GetMember(val.ToString())
                  .FirstOrDefault()
                  ?.GetCustomAttribute<DisplayAttribute>(false)
                  ?.Name
                  ?? val.ToString();
    }


    public void UpdateHandler(GridCommandEventArgs args)
    {
        SampleData item = (SampleData)args.Item;

        //update the view-model
        var index = MyData.FindIndex(i => i.ID == item.ID);
        if (index != -1)
        {
            MyData[index] = item;
        }

        //perform actual data source operations here
    }

    //model and dummy data generation
    public class SampleData
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public Role Role { get; set; }
    }

    public enum Role
    {
        [Display(Name = "Manager")]
        ManagerRole,
        [Display(Name = "Employee")]
        EmployeeRole,
        [Display(Name = "Contractor")]
        ContractorRole
    }

    public List<SampleData> MyData { get; set; }

    protected override void OnInitialized()
    {
        MyData = new List<SampleData>();

        for (int i = 0; i < 50; i++)
        {
            MyData.Add(new SampleData()
            {
                ID = i,
                Name = "name " + i,
                Role = (Role)(i % 3) // just some sample to populate initial values for the enum
            });
        }
    }
}

Hi Team,

I am looking for captcha component to verify user as human like below screenshot. Please let me know if this feature is available