Currently, when a user exports the Grid to Excel/CSV/PDF,  the export file is generated as a base64 string.

Please provide the file as a byte[] instead of a base64 string for better performance.

When enabling resizing and reordering for the Telerik Grid, using `MinResizableWidth` to set minimal column width will apply the constraint to the column position rather than the actual movable column. This means applying a min width of 200px to the first column will work as expected until the column is moved to another position. Now the column in question no longer has the min width applied, and the column that has moved into the first position has the 200px min width constraint. 

It appears this is due to the constraint being applied to the `data-col-index` rather than the `data-col-initialization-index`, or something to that effect.

The following example has a 200px min-width constraint applied to the "Name" first column, and no custom min-with applied to "Address" second column. Switching the columns by moving the "Name" after the "Address" will apply the constraint to the "Address" and not the "Name".

https://blazorrepl.telerik.com/QJEAcuPE41L7Uhiw44

Currently using 7.1.0 but looks to be an issue in later versions as shown by the REPL example. Tested in Firefox and Chrome.

The column position is arbitrary and the bug isn't due to the constraint being applied to the 0 column, applying the constrain to all even columns then shuffling would result in the constrain still being applied to all even columns.

I'm using an OnRead grid with ExpandoObjects. The error happens on the backend when trying to process the result of ToDataSourceResult(...)

When trying to access the Items property of AggregateFunctionsGroup in a multi level grouping scenario, using ExpandoObject, and the top level group has a null key, trying to access the Items property will result in a NullReferenceException. I've made this helper, but it cannot process the subgroups because of this error.

private static void FlattenGroup<T>(AggregateFunctionsGroup group, List<T> result)
{
    if (group == null)
    {
        return;
    }

    if (group.HasSubgroups)
    {
        foreach (var sub in group.Items.OfType<AggregateFunctionsGroup>())
        {
            FlattenGroup(sub, result);
        }
    }
    else
    {
        result.AddRange(group.Items.OfType<T>());
    }
}

In a scenario where I have an ExpandoObject with properties A and B, where A = 1 and B = null; grouping by A then B works. Grouping by A or B alone also works. But grouping by B then A causes the NullReferenceException when trying to access the group.Items. 

Description

When going fast over the Grid rows with the mouse cursor, the rows are highlighted after a delay. The delay is more noticeable on higher resolutions (2560x1440 or higher).

Steps To Reproduce

1. Hover the first Grid row and move the mouse cursor towards the last row (or vice versa).

Actual Behavior

In the app that targets .NET10 the row hover styles are applied with a delay, whereas in the app that targets .NET8 the hover styles are applied as soon as the mouse enters the boundaries of a row.

Expected Behavior

Similar performance in applying hover-related styles.

Browser

All

Last working version of Telerik UI for Blazor (if regression)

No response

When clicking on the Add Button in a Grid, a new item is created and displayed in edit mode.

Problem is, the OnEdit event is not triggered.  I need to set a default value for new items and added the code in the OnEditHandler with if(args.IsNew){ //set default value}.

Unfortunately this does not work because the event is not triggered.  This makes me wonder what "args.IsNew" is for if not for the usecase described above.

A workaround is to initialize the collection of the selected items:

<TelerikButton OnClick="@LoadData">Load Data</TelerikButton>

<TelerikGrid Data=@adminUsers Height="300px" Pageable=true PageSize=10 SelectionMode="@GridSelectionMode.Multiple"
             @bind-SelectedItems="SelectedAdminUsers">
    <GridColumns>
        <GridCheckboxColumn SelectAll="true"></GridCheckboxColumn>
        <GridColumn Field=@nameof(User.DisplayName) Title="User Name" />
        <GridColumn Field=@nameof(User.Department) Title="Department" />
        <GridColumn Field=@nameof(User.Status) Title="Status" />
        <GridColumn Field=@nameof(User.EmployeeId) Title="Employee Id" />
    </GridColumns>

</TelerikGrid>

@code
{
    public IEnumerable<User> SelectedAdminUsers { get; set; } = Enumerable.Empty<User>();

    public List<User> adminUsers { get; set; }

    void LoadData()
    {
        adminUsers = Enumerable.Range(1, 200).Select(x => new User
        {
            EmployeeId = x,
            Status = $"status {x}",
            Department = $"department {x}",
            DisplayName = $"name {x}"
        }
        ).ToList();
    }

    public class User
    {
        public string DisplayName { get; set; }
        public string Department { get; set; }
        public string Status { get; set; }
        public int EmployeeId { get; set; }
    }
}

<TelerikGrid Data="@GridData"
             FilterMode="Telerik.Blazor.GridFilterMode.FilterRow"
             SelectionMode="@GridSelectionMode.Multiple"
             @bind-SelectedItems="SelectedItems">
    <GridColumns>
        <GridCheckboxColumn Width="35px"/>
         <GridColumn Field="@(nameof(Data.Name))" />
     </GridColumns>
 </TelerikGrid>

@code{

    public class Data
    {
        public string Name { get; set; }
    }

    public List<Data> GridData { get; set; }
    public IEnumerable<Data> SelectedItems { get; set; }
    protected override void OnInitialized()
    {
        GridData = new List<Data>();
        SelectedItems = new List<Data>();
        GridData.Add(new Data{Name="abc"});
        GridData.Add(new Data{Name="abe"});
        GridData.Add(new Data{Name="xyz"});
    }
}

1. Filter the above grid by "abc" (the filtered grid will display "abc" correctly as the only entry)

2. Click into the "SelectAll" Checkbox (SelectedItems will wrongly contain "abc" AND "abe" !!!)

3. Click on "ClearFilter" Button --> the grid will display both "abc" and "abe" as selected !!!

It might be an indexing problem because the "SelectAll" Logic always seems to ignore the last character of the search string while the filtering of the display takes all characters into account.

This bug has cost be many hours and stomach pain!  Please let me know, if this will be fixed soon.  If not I will have to implement my own filtering (which makes me wonder why I'm using Telerik UI).

I have a grid that i use to display a number of different items with, some that have the need to display child or hierarchical grids, and some that don´t.

At the moment, all of the items show the "plus" button to expand the child grid, event though there is nothing there to show.

When a collection is null I think that the "plus" button to expand the hierarchical, or child grid, should be hidden. 

Or at least I should be able to hide that button manually by choice. 

Regards Magnus.

For example, I'd like something like this:
Field Name: record.TotalSales -> Auto-generated column title: "Total Sales" with inserted space

ADMIN EDIT: See also the idea below about "AutoGeneratedTitles" Func<string, string> property where the user could perform whatever processing they liked upon the default value. Please leave your comment on what approach you would prefer to be exposed.

We would like to see this functionality:

Stacked Header like in https://blazor.syncfusion.com/demos/datagrid/stacked-header?theme=bootstrap4

The null type of operator can cause errors on the backend

*** Thread created by admin on customer behalf ***

Please add a feature to export the grid to Microsoft Word file

---

ADMIN EDIT:

I am attaching a sample to this post that you can use to generate the docx file through the Telerik Document Processing libraries by looping over the data.

You can extend it further (add more fields, refactor so it is more reusable, extract to service,...) and if you would like to export the current grid data, see about implementing the data operations manually through the OnRead event - you can cache the DataSourceRequest object and then run a .ToDataSourceResult() query on the data to get what the grid displays on its current page. An example of a similar approach is available here for a customized excel export.

You can also read more about working with tables in a Word document here to apply more styling options as needed.

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At the moment, the CollapsedGroups  collection in the grid state is the indexes of the root-level groups that you can collapse. I want to also be able to control the expanded state of nested groups.

ADMIN EDIT:

Ideas I can see are the following, do add your vote and comments on how you expect that to be exposed:

• a form of Id/field in the group descriptor that controls this. Caveat - groups don't generally have such an id and the descriptor does not control the UI, it controls the data.
• an event that provides the level, field name and group value that lets me choose this for every group as it renders. Caveat - might not plug in the state, but if you have a certain business logic for that you can just keep it in that event always, regardless of the grid state, or keep additional information in an application state.
• the current indexes could become recursive (see the image attached below). Caveat: you can't be sure that the next time data loads the data and so the groups will be the same when loading state

On initialization of the Grid the oDataString is correct, but when I apply a filter or apply a sort to a Grid column the ToODataString extension method generates an incorrect request URL. If I revert back to 2.16.0 everything works as expected. 

When I have a grid with Reordable=true and a ComboBox in the HeaderTemplate, I cannot click in the combo box because the reordable functionality prevents it.

---

ADMIN EDIT

This could be exposed through a data- attribute that you could add to your DOM elements so that the grid can know to skip them, for example:

<TelerikGrid Data="@MyData" Height="300px" Pageable="true" Sortable="true" FilterMode="@GridFilterMode.FilterMenu" Reorderable="true">
    <GridColumns>
        <GridColumn Field="@(nameof(SampleData.ID))" Title="This title will not be rendered">
            <HeaderTemplate>
                Continent <br />
                <div style="text-align:center">Id</div>
                <div @onclick:stopPropagation="true" data-draggable="false">
                    <TelerikComboBox Data="@Continents" Filterable="true" class="headerCombo"
                                     @bind-Value="@SelectedContinentId"
                                     TextField="@nameof(Continent.Name)" ValueField="@nameof(Continent.Id)" Id="MyId">
                    </TelerikComboBox>
                </div>
            </HeaderTemplate>
        </GridColumn>
        <GridColumn Field=@nameof(SampleData.Name) Title="First Name" />
    </GridColumns>
</TelerikGrid>

@code {
    /* Grid */
    string result { get; set; }
    void DoSomething()
    {
        result = $"button in header template clicked on {DateTime.Now}, something happened";
    }

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

    public IEnumerable<SampleData> MyData = Enumerable.Range(1, 50).Select(x => new SampleData
    {
        ID = x,
        Name = "name " + x,
        HireDate = DateTime.Now.AddDays(-x)
    });

    /* ComboBox */

    public class Continent
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
    IEnumerable<Continent> Continents = new List<Continent>() { new Continent { Id = 1, Name = "Africa" }, new Continent { Id = 2, Name = "Asia" }, new Continent { Id = 3, Name = "South America" } };
    public int SelectedContinentId { get; set; } = 1;

}

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