Example Repo - https://github.com/benhysell/BlazorGridPagingIssue

tldr - OnRead args do not contain the correct page after restoring state without manual intervention.

Project Setup

• Base Blazor Client/Server template with Weather Forecasts as the data
• Server has a single OData endpoint to return 50 weather forecasts.  Each forecast starts with Temperature 0 and adds 1 per row to allow one to know which page they should be on
• Client has two pages configured, 'Paging NOT Working' and 'Paging Work Around'

Steps to Reproduce

• Navigate to 'Page NOT Working', select a page, i.e. page 5, navigate to the Counter page, navigate back to Page NOT Working.
• Grid will show Page 5 in the page selector, however the data being show in from Page 1
• Looking at Chrome 'Network' tab the OData query to obtain data from the backend does not contain proper offset for Page 5 data
• args.Request.Page reports Page 1, however the state of the Grid was just restored to Page 5

Workaround

I currently have a work around, this can be seen in the other page 'Paging Work Around'.

• On the first call to OnRead I check to see the last Grid state that was stored
• If the arg.GridState.Page does not match, (Stored vs the Request) I update the Request with the proper Page
• Proper OData query is generated to the backend.

Expected Behavior

• After state is restored first call to OnRead() would report the proper Page and make correct OData call.

Hello support team,

from the donut chart example under https://demos.telerik.com/blazor-ui/chart/donut-chart:

Is there a specific reason why all charts have a Template sub-property for the ChartSeriesTooltip construct but the Template field with the template syntax for the ChartSeriesLabels construct? I would favour a unified syntax for both of the properties, if this is possible somehow...

Is this planned for the future to be unified? Especially formatting like shown under https://docs.telerik.com/blazor-ui/knowledge-base/chart-format-percent is not as simple as I would have expected as nobody wants to touch JavaScript code literally :D (Also, localizing data seems quite difficult with that technique).

The best option in my opinion would be to remove those templates completely and just let the user decide what to show there while using a field called e.g. TooltipMappingName and LabelMappingName or something like that. This gives the chart the maximum of configuration possible.

Example:

<TelerikChart>
    <ChartTitle Text="What is you favourite sport?"></ChartTitle>
    <ChartLegend Visible="true" Position="ChartLegendPosition.Top"></ChartLegend>

    <ChartSeriesItems>
        <ChartSeries Type="ChartSeriesType.Donut"
                     Data="@Data"
                     Field="@nameof(ModelData.Value)"
                     CategoryField="@nameof(ModelData.Category)">
            <ChartSeriesTooltip Visible="true" Context="item" TooltipMappingName="@nameof(ModelData.Tooltip)"/>
            <ChartSeriesLabels Position="ChartSeriesLabelsPosition.OutsideEnd"
                               Visible="true"
                               Background="transparent"
                               LabelMappingName="@nameof(ModelData.Label)">
            </ChartSeriesLabels>
        </ChartSeries>
    </ChartSeriesItems>

</TelerikChart>

@code {
    public class ModelData
    {
        public string Category { get; set; }
        public int Value { get; set; }
  public string Tooltip { get; set; }
        public string Label { get; set; }
    }

    public List<ModelData> Data = new List<ModelData>()
    {
        new ModelData()
        {
            Category = "Football",
            Value = 35,
   Tooltip = "35%",
   Label = "Football: 35%"
        },
        new ModelData()
        {
            Category = "Basketball",
            Value = 25,
   Tooltip = "25%",
   Label = "Basketball: 25%"
        },
        new ModelData()
        {
            Category = "Volleyball",
            Value = 20,
   Tooltip = "20%",
   Label = "Volleyball: 20%"
        },
        new ModelData()
        {
            Category = "Rugby",
            Value = 10,
   Tooltip = "10%",
   Label = "Rugby: 10%"
        },
        new ModelData()
        {
            Category = "Tennis",
            Value = 10,
   Tooltip = "10%",
   Label = "Tennis: 10%"
        }
    };
}

Best regards,

Christian

If I set grouping in OnStateInit, the GroupFooterTemplate does not have data for the aggregates I have set. If I group manually by dragging a column header, the data is there.

------

ADMIN EDIT: This stems from a framework behavior. The <GridAggregates> tag is a child component of the grid and as such, initializes after the grid. Since there is no event when all such child components are initialized the parent component cannot wait for them before starting to render and thus, it initializes before it can know what aggregates are defined.

I'm working on blazor server side application.
After update Telerik.UI.for.Blazor from 2.1 to 2.5 (before I updated .net core from 3.0 to 3.1) it shows following error:
InvalidOperationException: The current thread is not associated with the Dispatcher. Use InvokeAsync() to switch execution to the Dispatcher when triggering rendering or component state.

I investigated that it's cause by Telerik window.
The error occurs when window is on start page or when the page is refreshed.
Below code for Index.razor which cause the error:

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. 

In the attached sample you will see that the textbox (the second input) is 2px taller than the numeric textbox (the first input). Both of them are several pixels taller than the combo box and date picker.

---

ADMIN EDIT

Related to this issue in the themes repo about improving bootstrap integration.

A workaround can be adding specific height to the widgets you use through the bootstrap classes, for example:

<style>
    input.k-textbox.form-control,
    k-datetimepicker.form-control,
    .k-widget.k-combobox.k-header.form-control {
        height: calc(2.25rem) !important;
    }
</style>

<div class="container-fluid border pt-md-3">
    <div class="row">
        <h5 class="pl-3 pb-3">nach Geschäftsfall suchen</h5>
    </div>
    <EditForm Model="SuchParameter" OnValidSubmit="HandleValidSubmit">
        <DataAnnotationsValidator />
        <div class="row  mb-1">
            <div class="col-md-4">
                <label for="fallJahr">Fall-Jahr</label>
            </div>
            <div class="col-md-8">
                <TelerikNumericTextBox Id="fallJahrTelerik" @bind-Value="SuchParameter.Jahr" Class="form-control" Arrows="false" />
            </div>
        </div>
        <div class="row  mb-1">
            <div class="col-md-4">
                <label for="fallNummer">Fall-Nr.</label>
            </div>
            <div class="col-md-8">
                <TelerikTextBox Id="fallNummer" @bind-Value="SuchParameter.Nummer" Class="form-control" />
            </div>
        </div>

        <div class="row  mb-1">
            <div class="col-md-4">
                <label for="geschaeftsArt">Geschäftsart</label>
            </div>
            <div class="col-md-8">
                <TelerikComboBox Id="geschaeftsArt" ValueChanged="@( (string c) => OnGeschaeftsArtChanged (c))" Value="selectedGeschaeftsArt" ValueField="Art" TextField="Art" ValueExpression="@( () => selectedGeschaeftsArt )"
                                 Data="@GeschaeftsArten" Placeholder="Geschäftsart auswählen" ClearButton="true" Width="100%" 
                                 Class="form-control"/>
            </div>
        </div>
        <div class="row  mb-1">
            <div class="col-md-4">
                <label for="posteingang">Posteingang </label>
            </div>
            <div class="col-md-8">
                <TelerikDateTimePicker Id=posteingang @bind-Value="@selectedTime" Format="dd.MM.yyyy" Width="100%"
                                       Class="form-control"></TelerikDateTimePicker>
            </div>
        </div>

        <button type="submit" class="btn btn-block btn-primary">Suchen</button>
        <ValidationSummary />
    </EditForm>
</div>

@code{
    public class TheFormModel
    {
        public int Jahr { get; set; }
        public string Nummer { get; set; }
    }

    public class ComboModel
    {
        public string Art { get; set; }
    }

    TheFormModel SuchParameter { get; set; } = new TheFormModel();
    string selectedGeschaeftsArt { get; set; }
    List<ComboModel> GeschaeftsArten { get; set; } = Enumerable.Range(1, 5).Select(x => new ComboModel { Art = $"Art {x}" }).ToList();
    DateTime selectedTime { get; set; }

    void HandleValidSubmit()
    {

    }

    void OnGeschaeftsArtChanged(string v)
    {
        selectedGeschaeftsArt = v;
    }
}

---

Hi - this one is a feature request, not a bug. :)

For the filter menu, when you enter a filter value, it would be nice if you could press enter to execute the filter instead of having to click "Filter."

I use Guids to identify data in my application. It is a lot more reliable than using integers; however, it appears as if the TreeList does not support the use of Guids for the Id and ParentId fields when building the list's view.

---

ADMIN EDIT

This was not a bug, it was probably a configuration issue, as the scenario works, so this is marked as "declined". See the thread below for a sample.

---

When you move the mouse over the grid cells in this example, several tooltips can remain shown, especially if you move the mouse down so it goes through a tooltip when going towards the next row, and you move it quickly.

<div class="row">
    <TelerikGrid Data="@Items">
        <RowTemplate Context="sampleData">
            @{
                string detailLink = $"info/{sampleData.Id}";
                string className = $"screenshot-hover-{sampleData.Id}";
                string selector = $".{className}";
                <td title="@sampleData.Name" data-id="@sampleData.Id" class="@className">
                    <NavLink href="@detailLink">@sampleData.Name</NavLink>
                </td>
                <td title="@sampleData.Name" data-id="@sampleData.Id" class="@className">
                    <NavLink href="@detailLink">@sampleData.Name</NavLink>
                </td>
                <td title="@sampleData.Name" data-id="@sampleData.Id" class="@className">
                    <NavLink href="@detailLink">@sampleData.Name</NavLink>
                </td>
                <TelerikTooltip TargetSelector="@selector" ShowOn="@TooltipShowEvent.Hover" Position="@TooltipPosition.Bottom">
                    <Template Context="ttipContext">
                        @{
                            var dataAttributes = ttipContext.DataAttributes;
                            var title = ttipContext.Title;
                            if (title != null && dataAttributes.ContainsKey("id"))
                            {
                                <img src="images/@(dataAttributes["id"])" alt="@title" />
                                <p>@title</p>
                            }
                        }
                    </Template>
                </TelerikTooltip>
            }
        </RowTemplate>

        <GridColumns>
            <GridColumn Field="@(nameof(SampleData.Name))" />
            <GridColumn Field="@(nameof(SampleData.Address))" />
            <GridColumn Field="@(nameof(SampleData.PhoneNumber))" />
        </GridColumns>
    </TelerikGrid>
</div>

@code {
    class SampleData
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Address { get; set; }
        public string PhoneNumber { get; set; }
    }

    SampleData[] Items { get; set; }

    protected async override Task OnInitializedAsync()
    {
        const int sampleSize = 25;
        Items = new SampleData[sampleSize];
        for (int i = 0; i < sampleSize; i++)
        {
            Items[i] = new SampleData
            {
                Id = i,
                Name = $"{i}.SomeName",
                Address = $"{i}{i}{i}{i} Cherry Lane",
                PhoneNumber = $"1-512-{i % 100:00}4-6000",
            };

        }

        await Task.CompletedTask;
    }
}

On initialization of the Grid the oDataString is correct, but when I apply a Filter (through the FilterMenu) or apply a sort to a Grid column the ToODataString extension method throws with null reference exception. If the FilterMode is set to FilterRow or revert back to 2.16.0 everything works as expected. 

<AdminEdit>

This bug extends to the functionality of the FilterMenu as a feature and is not connected only to the ToODataString();

</AdminEdit>

The context DataItem is null for subsequent ChartSeries. It receives the correct object for the first ChartSeries, but for the rest is null. 

<Admin Edit>

A workaround, for the time being, would be to remove the Template and let the Tooltip display the default value, which will be correct.

</Admin Edit>

Reproduction code:

<TelerikChart>
    <ChartTitle Text="Unrecoverable Errors Per Minute vs. Signal Level" />
    <ChartCategoryAxes>
        <ChartCategoryAxis Type="@ChartCategoryAxisType.Category" />
    </ChartCategoryAxes>
    <ChartValueAxes>
        <ChartValueAxis>
            <ChartValueAxisLabels Visible="true" />
        </ChartValueAxis>
    </ChartValueAxes>

    <ChartTooltip Visible="true">
        <Template>
            @{
                var data = context.DataItem as ModelData;
                <div class="card" style="font-size: 0.8rem; color: black">
                    <span>@($"{data.Value}")</span>
                    <span>@($"{data.Type}")</span>

                </div>
            }
        </Template>
    </ChartTooltip>

    <ChartSeriesItems>
        <ChartSeries Type="ChartSeriesType.Line"
                     Data="@ChartData1"
                     CategoryField="@nameof(ModelData.Type)"
                     Field="@nameof(ModelData.Value)">
        </ChartSeries>
        <ChartSeries Type="ChartSeriesType.Line"
                     Data="@ChartData2"
                     CategoryField="@nameof(ModelData.Type)"
                     Field="@nameof(ModelData.Value)">
        </ChartSeries>
        <ChartSeries Type="ChartSeriesType.Line"
                     Data="@ChartData3"
                     CategoryField="@nameof(ModelData.Type)"
                     Field="@nameof(ModelData.Value)">
        </ChartSeries>
    </ChartSeriesItems>

</TelerikChart>

@code {
    public class ModelData
    {
        public string Type { get; set; }
        public double Value { get; set; }
    }

    public List<ModelData> ChartData1 = new List<ModelData>() { new ModelData() { Type = "S1", Value = 1 } };
    public List<ModelData> ChartData2 = new List<ModelData>() { new ModelData() { Type = "S2", Value = 5 } };
    public List<ModelData> ChartData3 = new List<ModelData>() { new ModelData() { Type = "S3", Value = 9 } };
}

When I have some dynamic content inside the tooltip template, the tooltip seems not to be re-rendering. E.g. when I have a tooltip with a text input and button and wish to disable the button when no text is entered, the tooltip seems to be only refreshing after closing and re-opening it. Simplified example:

<TelerikTooltip TargetSelector=".search-tooltip" Position="TooltipPosition.Bottom" ShowOn="TooltipShowEvent.Click">
	<Template>
		<TelerikTextBox @bind-Value="@SearchText"></TelerikTextBox>
		<TelerikButton OnClick="@Search" Enabled="@(!string.IsNullOrEmpty(SearchText))">Search</TelerikButton>
	</Template>
</TelerikTooltip>

Even tried using the ValueChanged event of the TelerikTextBox and calling the StateHasChanged() method but had the same result (the enabled/disabled state of button only changed after closing&re-opening the tooltip).

I would expect the binding and re-rendering to work as normally in Blazor. Is there a way to manually 'call refresh' on the tooltip?

Is it possible to do group scheduling similar to what is done https://demos.telerik.com/aspnet-mvc/scheduler/resources-grouping-horizontal.

If not how do i include kendo in a serverside blazor application?

Cheers

Ian