---
ADMIN EDIT
Screen recording attached below, code to reproduce it too.
---
In the docs https://www.telerik.com/blazor-ui/documentation/components/chart/overview#styling-with-css-variables there is an example on using CSS variables to set colours of the Chart component. And yes, if I set the --kendo-chart-bg CSS variable to some colour, the chart background is coloured with it. But, I can't change the colour at runtime, for example for switching between light and dark themes at user request.
But, shouldn't this be possible as the SVG is rendered inline? I see the chart being rendered as elements like below where the fill propertys value comes from the --kendo-chart-bg variable. But if the fill was instead set to "var(--kendo-chart-bg)" I would be able to change --kendo-chart-bg at runtime and the chart would reflect the change without needing to be refreshed separately? Same should go for all the text and series' colours.
<svg>
<g>
<path d="M0 0 L 400 0 400 240 0 240Z" stroke="none" fill="#0f0"></path>
</g>
</svg>I also saw this, but I think this is before you added the CSS colouring? https://feedback.telerik.com/blazor/1496389-using-custom-themes-changing-at-runtime-does-not-change-the-chart-component-style
Currently, the TelerikChartBreadcrumb does not allow specifying how the Breadcrumb items are visualized when their total width exceeds the width of the component.
A possible alternative to achieve the same result is to override the default theme styles with the following CSS rule:
.k-breadcrumb-container {
flex-flow: row wrap;
}Here is a REPL example to see the result of the above CSS approach - https://blazorrepl.telerik.com/GTOyPYbG23PugZBQ36
I am creating a Donut Chart and believe I have found a bug. On the initial load of the page, the donut chart element is not playing its animation when the label property "Visible=false". Instead, it pops on with no animation. The animations do play on the drilldown elements on their initial loads, but clicking the refresh chart button also causes this behavior even on drilldown levels. Resetting the drilldown also causes this behavior. The chart legend remains visible during the time when the chart is not. Setting the labels visible property to true causes the animations to play correctly. This proof of concept utilizes static data. The application was created using the telerik templates and is correctly injecting the telerik components as all other telerik components, including other chart components, are functioning as expected. I have isolated the code for the donut chart and posted it here.
<TelerikButton OnClick="@(() => DonutChart.Refresh())">Refresh Donut Chart</TelerikButton>
<TelerikButton OnClick="@(() => DonutChart.ResetDrilldownLevel(0))">Reset DrillDown</TelerikButton>
<!-- Donut Chart -->
<TelerikChart @ref="DonutChart">
<ChartTitle Text="Donut Chart" />
<ChartLegend Position="Telerik.Blazor.ChartLegendPosition.Right" />
<ChartSeriesItems>
<ChartSeries Type="ChartSeriesType.Donut"
Data="@donutData"
Field="@nameof(DonutModel.Number)"
CategoryField="@nameof(DonutModel.Category)"
ColorField="@nameof(DonutModel.SegmentColor)"
DrilldownField="@nameof(DonutModel.DrillDown)">
<ChartSeriesBorder Color="white" Width="2" />
<ChartSeriesLabels Position="ChartSeriesLabelsPosition.Above"
Visible="false"
Background="transparent">
</ChartSeriesLabels>
</ChartSeries>
</ChartSeriesItems>
</TelerikChart>
@code {
// Donut Chart
public TelerikChart DonutChart;
public class DonutModel
{
public string Category { get; set; }
public int Number { get; set; }
public string SegmentColor { get; set; }
public ChartSeriesDescriptor? DrillDown { get; set; }
}
public List<DonutModel> donutData = new List<DonutModel>
{
new DonutModel
{
Category = "Category 1 with Drilldown",
Number = 263,
SegmentColor = "#9d3cc7",
DrillDown = new ChartSeriesDescriptor
{
Name = "Drilldowns",
Type = ChartSeriesType.Donut,
Field = nameof(DonutModel.Number),
CategoryField = nameof(DonutModel.Category),
DrilldownField = nameof(DonutModel.DrillDown),
Data = new List<DonutModel>()
{
new DonutModel
{
Category = "Drill Down 1",
Number = 102,
SegmentColor = "#9d3cc7",
DrillDown = new ChartSeriesDescriptor
{
Name = "People",
Type = ChartSeriesType.Donut,
Field = nameof(DonutModel.Number),
CategoryField = nameof(DonutModel.Category),
Data = new List<DonutModel>()
{
new DonutModel
{
Category = "John Doe",
Number = 27,
SegmentColor = "#9d3cc7"
},
new DonutModel
{
Category = "David Smith",
Number = 45,
SegmentColor = "green"
},
new DonutModel
{
Category = "Mary Johnson",
Number = 63,
SegmentColor = "yellow"
},
new DonutModel
{
Category = "Robert Brown",
Number = 56,
SegmentColor = "orange"
}
}
}
},
new DonutModel
{
Category = "Drilldown 2",
Number = 67,
SegmentColor = "green",
DrillDown = new ChartSeriesDescriptor
{
Name = "People",
Type = ChartSeriesType.Donut,
Field = nameof(DonutModel.Number),
CategoryField = nameof(DonutModel.Category),
Data = new List<DonutModel>()
{
new DonutModel
{
Category = "John Doe",
Number = 15,
SegmentColor = "#9d3cc7"
},
new DonutModel
{
Category = "David Smith",
Number = 17,
SegmentColor = "green"
},
new DonutModel
{
Category = "Mary Johnson",
Number = 19,
SegmentColor = "yellow"
},
new DonutModel
{
Category = "Robert Brown",
Number = 16,
SegmentColor = "orange"
}
}
}
},
new DonutModel
{
Category = "Drilldown 3",
Number = 10,
SegmentColor = "orange",
DrillDown = new ChartSeriesDescriptor
{
Name = "People",
Type = ChartSeriesType.Donut,
Field = nameof(DonutModel.Number),
CategoryField = nameof(DonutModel.Category),
Data = new List<DonutModel>()
{
new DonutModel
{
Category = "John Doe",
Number = 3,
SegmentColor = "#9d3cc7"
},
new DonutModel
{
Category = "David Smith",
Number = 4,
SegmentColor = "green"
},
new DonutModel
{
Category = "Mary Johnson",
Number = 1,
SegmentColor = "yellow"
},
new DonutModel
{
Category = "Robert Brown",
Number = 2,
SegmentColor = "orange"
}
}
}
}
}
}
},
new DonutModel
{
Category = "Category 2 with no Drilldown",
Number = 31,
SegmentColor = "#fab933"
}
};
When OnAxisLabelClick is set, the ChartCategoryAxisLabels do not get 'cursor: pointer' which is confusing for users because it makes it appear as if the axis labels are not clickable when they actually are.
===ADMIN EDIT===
In the meantime add the cursor: pointer CSS style to the labels. Here is a REPL example:
https://blazorrepl.telerik.com/cyvEYNbP27vsCSLG28
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.
For real-time data purposes, I need to update the data and add new items. If I drill down and then add a new item, the Chart refreshes and goes to the top page (resets the drill down level to 0).
Reproduction: https://blazorrepl.telerik.com/QeOtQaOD46j4I3Ih46.
I want to be able to dynamically enable/disable the Pan and Zoom functionalities at runtime. Currently, the Chart does not react to such changes.
===
ADMIN EDIT
===
A possible option for the time being is to dispose the component and re-initialize it after changing the Pan/Zoom properties: https://blazorrepl.telerik.com/mSuNQkEj10nSug2k22.
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 },
};
}
It would be nice to be able to use Html markup in the ChartCategoryAxisLabel.
I can see in the documentation that it currently doesn't support this. I am curious if it is possible. Thank you.
This functionality would be very useful for data analysis.
Moving the cursors within the chart itself, allows to define a range within the series, being able to offer useful data.
Examples:
I would like to synchronize several Charts, so when I move the mouse through one of them, the other two Charts show crosshairs at the same position as the first hovered Chart.
===
ADMIN EDIT
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Prerequisite: Chart Crosshair
Hi,
I would like to be able to show / hide a serie by clicking to a legend.
Is there a way to do it actually ?