Pending Review
Last Updated: 23 May 2022 17:07 by Brian

Can the dev team comment on any known reasons why Charts (I think both SVG and Canvas) might not display when a blazor page is rendered from an automation tool like Chromium, Puppeteer, etc.? (e.g., https://developers.google.com/web/tools/puppeteer).

I have a standard blazor page that I can manually from a standard Chrome window, and it works fine and the Telerik chart displays.

But the same page, when launched either headless or with a GUI browser window, from a tool like Chromium or Puppeteer (with javascript enabled of course), it seems like the DOM is never dynamically updated to include the chart.

Unplanned
Last Updated: 27 Mar 2022 09:05 by Andrew

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ADMIN EDIT

Screen recording attached below, code to reproduce  it too.

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Unplanned
Last Updated: 07 Mar 2022 10:31 by Mark Stevens

I am trying to customize the format of the ChartCategoryAxisLabels to render the abbreviated name of the day of the week using the following format:

<ChartCategoryAxisLabels Format="ddd dd/MM HH:mm"/>

While it is a valid format, it seems that it doesn't work for the category labels.

---

ADMIN EDIT

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For the time being, you can use the following to render the abbreviated name of the day of the week in the ChartCategoryAxisLabels:

<ChartCategoryAxisLabels Format="{0:EEE dd/MM HH:mm}"/>
Unplanned
Last Updated: 08 Dec 2021 10:12 by ADMIN
Cannot remove the last series of a dynamically created chart
Unplanned
Last Updated: 05 Oct 2021 11:23 by ADMIN
The Chart does not render correctly when Stack100 is applied to the Series and it has only one value per series. When the value for the first series is greater than the value for the second series the rendering does not start from 0% to 100%, but from a percentage above 0%.
Declined
Last Updated: 28 Sep 2021 06:53 by ADMIN

The Chart Tooltip does not render correct values for the data points when the chart is bound to a model, has multiple series and Template is used. The DataItem does not seem to work as expected.

ADMIN EDIT:

If the Chart is bound with Independent Series Binding the FormattedValue will get the correct values.

If the Chart has no Template the correct values for the data points will be displayed

Declined
Last Updated: 28 Aug 2021 10:00 by ADMIN
Created by: Annabel
Comments: 1
Category: Charts
Type: Bug Report
1

I have a line chart I am using to plot two related series of data. When these two series have the same values, or very similar values, the series that is second in the render order completely covers up the first line. This makes it look like the first line isn't being rendered, and makes it impossible to access the tooltips for the first series. I need a way to disambiguate overlapping data.

 

Thank you

Unplanned
Last Updated: 01 Mar 2021 15:55 by ADMIN
When I set the AutoHide parameter of the Chart Tooltip to false it does not affect the way the tooltip is closing. 
Completed
Last Updated: 22 Jan 2021 16:02 by ADMIN
Release 2.21.1

Our Site supports multiple themes that we have built using the SASS Theme Builder. For all Telerik Components we have used so far the theme changes on them as expected when using the example found here (Change Theme at Runtime). The problem seems to be the chart component will not adhere to the newly applied theme after its initial load. Seems like this is because it is shown as an SVG with hardcoded attributes on the element. Is there a workaround for this (other than reloading the components entirely)?

 

Before & After Theme Change:

Completed
Last Updated: 06 Nov 2020 09:41 by ADMIN
Release 2.19.0

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 } };
}

 

Unplanned
Last Updated: 30 Sep 2020 06:57 by ADMIN
When I place a Chart in a small container, for example, a div, the labels are cut off and thus unreadable.
Completed
Last Updated: 11 Sep 2020 04:26 by ADMIN
Release 2.17.0
Created by: Cheryl
Comments: 5
Category: Charts
Type: Bug Report
15

Hi!

I'm building a Blazor Component using your TelerikChart.  To build my chart, I'm dynamically inserting the series name and the series data, which is pulled from a list.  I also have a button on the page that changes the dataset (last month, this month, next month, etc).  The button will rebuild the list of names and data, and Blazor will build the chart with a 'foreach' entry in the ChartSeriesItems section of the Chart Component.

The problem is that the Items are not cleared each time.  When I click the button, I'm getting previous values. In the example below, I have 3 data sets.  The first has 4 items, the second has 8 and the third has 6.  If the user clicks the second, showing all 8, then clicks the first, the chart will show the new 4, and the previous 5-8 from the second set.  

 My chart description in HTML is:

... 

<ChartSeriesItems> @foreach(Tuple<string, object[]> t in myData) { <ChartSeries Type="ChartSeriesType.Column" Name=@t.Item1 Data=@t.Item2 /> } </ChartSeriesItems>

... 

I have checked my data through debugging to ensure that the myData variable is correct (i.e. when I click the first data, it only has 4 items).  However, when the chart displays, it shows 8 items. 

Is there a CLEARDATA method or something I can call on the Chart to ensure that the data is reset each time?  I see that there is a Clear() in JavaScript, but I'm writing in only Blazor and C#, with no JavaScript.

I've attached the .razor page for your reference.  (As this is my test code, I'm using random number generation to get the data.)

 

Thank you so much for your help!!

-Cheryl Simpson 

Unplanned
Last Updated: 05 Aug 2020 11:26 by ADMIN
Created by: Datafyer
Comments: 0
Category: Charts
Type: Bug Report
2
Sometimes the chart tooltip goes off the screen. 
Unplanned
Last Updated: 26 May 2020 01:01 by ADMIN

 

Hi, I can't figure how to use the Min/Max properties of the ChartCategoryAxis because if I set these properties, the chart disappears.

Please help me.

 

@page "/"

<TelerikChart>

    <ChartSeriesItems>
        <ChartSeries Type="ChartSeriesType.Line" Name="Test" Data="@mesures"
                     Field="@nameof(Mesure.Value)" CategoryField="@nameof(Mesure.Date)" Aggregate="ChartSeriesAggregate.Sum">
        </ChartSeries>
    </ChartSeriesItems>

    <ChartCategoryAxes>
        <!-- This is OK -->
        @*<ChartCategoryAxis BaseUnit="ChartCategoryAxisBaseUnit.Hours" Type="ChartCategoryAxisType.Date" BaseUnitStep="1"></ChartCategoryAxis>*@

        <!-- This isn't : nothing is displayed -->
        <ChartCategoryAxis Min="@MinDate" Max="@MaxDate" BaseUnit="ChartCategoryAxisBaseUnit.Hours" Type="ChartCategoryAxisType.Date" BaseUnitStep="1"></ChartCategoryAxis>
    </ChartCategoryAxes>

</TelerikChart>

@code {

    private DateTime MinDate { get; set; } = new DateTime(2019, 01, 01, 13, 0, 0);
    private DateTime MaxDate { get; set; }   = new DateTime(2019, 01, 01, 17, 0, 0);

    public class Mesure
    {
        public DateTime Date { get; set; }
        public int Value { get; set; }
    }

    public List<Mesure> mesures = new List<Mesure>()
    {
        new Mesure() { Date = new DateTime(2019, 01, 01, 13, 0, 0), Value = 1 },
        new Mesure() { Date = new DateTime(2019, 01, 01, 14, 0, 0), Value = 2 },
        new Mesure() { Date = new DateTime(2019, 01, 01, 14, 30, 0), Value = 3 },
        new Mesure() { Date = new DateTime(2019, 01, 01, 14, 35, 0), Value = 4 },
        new Mesure() { Date = new DateTime(2019, 01, 01, 15, 0, 0), Value = 5 },
        new Mesure() { Date = new DateTime(2019, 01, 01, 16, 0, 0), Value = 6 },
        new Mesure() { Date = new DateTime(2019, 01, 01, 17, 0, 0), Value = 7 },
    };
}


Declined
Last Updated: 19 Aug 2019 04:37 by ADMIN
Created by: Valid Development Factory
Comments: 2
Category: Charts
Type: Bug Report
1

Hi,

We tried making the name property of our TelerikChartSeries dynamic by binding it to a string value. This however seems to completely crash startup, the browser tab freezes and the console doesn't show any errors. If we just put in a simple string in the Name property the application runs without a problem.

<TelerikChartSeries Type="ChartSeriesType.Column" Name="@Team1Name" Data="@Results" Field="@nameof(ChartViewModel.Team1Score)" CategoryField="@nameof(ChartViewModel.CategoryName)">
    <TelerikChartSeriesLabels Visible="true" />
</TelerikChartSeries>

As you can see in this example we're binding the Name property to Team1Name which can be changed whenever another team is selected from a dropdownlist.

Thank you in advance.

Unplanned
Last Updated: 05 Aug 2019 07:12 by ADMIN
Created by: Garrett
Comments: 0
Category: Charts
Type: Bug Report
6

After updating the chart data, some elements remain in the DOM. This can clutter the browser if the data updates come in on intervals and the chart remains in operation for a while. A screenshot is attached below.

MCVE:

@using Telerik.Blazor
@using Telerik.Blazor.Components.Button
@using Telerik.Blazor.Components.Chart
 
<h3>Chart</h3>
 
 
<TelerikButton Primary="true" @onclick="AddDataPoint">Add data point</TelerikButton>
 
<TelerikChart Transitions="false">
    <TelerikChartSeriesItems>
        <TelerikChartSeries Type="ChartSeriesType.Line" Name="CPU Usage Data" Data="@simpleData">
        </TelerikChartSeries>
    </TelerikChartSeriesItems>
 
    <TelerikChartValueAxes>
        <TelerikChartValueAxis Max="100" Color="black"></TelerikChartValueAxis>
    </TelerikChartValueAxes>
 
    <TelerikChartTitle Text="CPU Usage"></TelerikChartTitle>
 
    <TelerikChartLegend Position="Telerik.Blazor.ChartLegendPosition.Bottom">
    </TelerikChartLegend>
</TelerikChart>
 
 
 
@code {
    void AddDataPoint()
    {
        Random random = new Random();
        var _val = Math.Round((random.NextDouble() * 100), 3);
 
        if (simpleData.Count >= 60)
        {
            simpleData = simpleData.TakeLast(59).ToList();
        }
        simpleData.Add(_val);
 
        //StateHasChanged();
 
    }
 
    public List<object> simpleData = new List<object>();
}