It would be nice if it was possible to have a grid and have already in a cell the value of 1 and somebody want's to add 4 to it he doesn't have to calculate but could just type 1+4 and the answer (5) would be saved to the grid.

Using the following code to allow the user to select rows in the grid

<GridCheckboxColumn SelectAll="true" Locked="true" />

When using the Grid Export to Excel, there is no facility for the export to only use the rows selected by the user

<GridExport>

     <GridExcelExport FileName="Export File" AllPages="@ExportAllPages" />

</GridExport>

Hi,

Is it possible to drag grid row to another page on the same grid? 

thanks,
Irina

When you set widths to some columns in the grid, the rest of the columns stretch to accommodate the rest of the width. Thus, the row drag column can stretch and become unexpectedly wide. A screenshot of the problem is attached.

Perhaps the GridRowDraggableSettings could have a parameter for the width of the draggable column.

<AdminEdit>

As a workaround you can use some CSS to set a width for the Drag column:

<style>
    .custom-row-draggable-col-width.k-grid .k-drag-col {
        width: 100px;
    }
</style>

<TelerikGrid Data="@MyData" Height="400px"
             Class="custom-row-draggable-col-width"
             Pageable="true"
             Resizable="true"
             Reorderable="true"
             RowDraggable="true"
             OnRowDrop="@((GridRowDropEventArgs<SampleData> args) => OnRowDropHandler(args))">
    <GridSettings>
        <GridRowDraggableSettings DragClueField="@nameof(SampleData.Name)"></GridRowDraggableSettings>
    </GridSettings>
    <GridColumns>
        <GridColumn Field="@(nameof(SampleData.Id))" Width="120px" />
        <GridColumn Field="@(nameof(SampleData.Name))" Title="Employee Name" Groupable="false" />
        <GridColumn Field="@(nameof(SampleData.Team))" Title="Team" />
        <GridColumn Field="@(nameof(SampleData.HireDate))" Title="Hire Date" />
    </GridColumns>
</TelerikGrid>

@code {
    private void OnRowDropHandler(GridRowDropEventArgs<SampleData> args)
    {
        //The data manipulations in this example are to showcase a basic scenario.
        //In your application you should implement them as per the needs of the project.

        MyData.Remove(args.Item);

        var destinationItemIndex = MyData.IndexOf(args.DestinationItem);

        if (args.DropPosition == GridRowDropPosition.After)
        {
            destinationItemIndex++;
        }

        MyData.Insert(destinationItemIndex, args.Item);
    }

    public List<SampleData> MyData = Enumerable.Range(1, 30).Select(x => new SampleData
    {
        Id = x,
        Name = "name " + x,
        Team = "team " + x % 5,
        HireDate = DateTime.Now.AddDays(-x).Date
    }).ToList();

    public class SampleData
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Team { get; set; }
        public DateTime HireDate { get; set; }
    }
}

</AdminEdit>

Horizontal scroll bar is visible, but doesn't move with cursor/current-cell.

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ADMIN EDIT

Applies also to vertical scrolling with or without row virtualization (e.g., using InCell edit mode, pressing Enter will open the next row for editing, but it will not work out with row virtualization at all after the current viewport, and without virtualization you will not see what's happening until you start typing and the browser calls .scrollIntoView() for the editor)

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I set the GridColumn DisplayFormat="{0: yyyy-MM-dd}" and the data reflects that format. The default filter control doesn't. How can I make the control do that?

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ADMIN EDIT

For the time being, the way to affect the filter behavior is through a custom filter template. The format for date pickers and numeric textboxes comes from the app culture settings (see more here). You may also want to Follow this idea for easier selection of a default filter operator and limiting the filter operators choices.

---

I noticed after debugging a problem when editing some rather complex rows in a grid that the grid internally calls Telerik.Blazor.Extensions.ObjectExtensions.Clone(...) to create a deep clone for editing. If the object being cloned implements System.ICloneable then this is ignored and an attempt is made to clone it using reflection - the problem is that ObjectExtensions.Clone(...) fails for a number of cases and observing ICloneable would give a developer the means to implement the correct cloning behaviour.

I'm not asking for ObjectExtensions.Clone(...) to be fixed in any way (after all, no matter what you do there will always be some cases it cannot handle), just to use ICloneable where possible.

As an aside, the failed cases were:

• object has an indexer with get/set (exception thrown by ObjectExtensions.Clone() because it attempts to read the value without passing an index)
• object implements IEnumerable, including arrays (original object returned without being cloned)
• object contains a circular reference (stack overflow)

The grid should support INotifyPropertyChanged for the objects in the grid, i.e. if the data object implements INotifyPropertyChanged and a property value changes, the corresponding cell value in the grid should also change.

I want the grid to be able to resize all the columns (or only certain columns) to fit their data, when the data loads, without the user having to double click the border between them.

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ADMIN EDIT

Automatic application of the auto fitting will come with a flicker, and that's why it was declined as a feature originally. In Blazor we have a detachment between code and when exactly something is rendered. So, we have no way to trigger the resizing logic immediately after the columns content is rendered. The events that are available will cause a flicker and can cause a performance hit - both for the browser and also by raising StateChanged multiple times.

Another caveat is how would this be exposed for configuration - should it work for all columns at once, or only for certain columns (how to control for which ones), how to control which data-related events should invoke this logic (or should it happen super often on any event). Exposing such configuration is likely to lead to a property hell type of situation.

Perhaps a way to get this would be to provide API on the grid to invoke that functionality that you can call as required by your logic and UX: https://feedback.telerik.com/blazor/1513384-programmatically-invoke-fit-to-width-functionality-for-the-grid-columns.

Nevertheless, we will keep this open to monitor for feedback, what is requested, interest and how people would want it exposed. Leave your comments and preferences here.

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I want to be able to use interfaces and models that are created from a service when working with the grid. A parameterless constructor is not enough for me, I need to be able to instantiate models in a more complex manner.

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ADMIN EDIT

The tentative event name I have put in the title might vary when the implementation is researched. The goal would still be the same - the grid to provide an event when it needs an instance of the model so you can provide it with one. At the moment this happens when a row enters edit mode, when the filter list needs to be built, and when you are inserting an item (a caveat with the last one might be the OnClick event for the command button - the new event might have to fire before OnClick so it can give you the model).

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I would like the grid and treelist to honor the DisplayFormatAttribute.NullDisplayText Property so I don't have to use cell templates to change what null values render.

FYI... Here's a REPL of it not respecting it

I would like to export custom data to excel, for example - the selected items.

<AdminEdit>

As an attached file, you can see a sample implementation that shows how you can export the Selected Items from the Grid to excel.

</AdminEdit>