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
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.
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
===
Prerequisite: Chart Crosshair
Hello,
I want to connector to be directly connected with the chart.
See https://dojo.telerik.com/AkEHuSiq/3 for reference.
Thank you.
Enhance the Chart date axis label format, so that it's culture-aware in globalization scenarios, and there is no need to set ChartCategoryAxisLabels Format explicitly.
In the meantime, here are a few workarounds for the case when the ChartCategoryAxis BaseUnit is Days and the Chart shows MM/dd labels even to non-US users.
- The easier option is to use a standard format string:
<ChartCategoryAxis BaseUnit="ChartCategoryAxisBaseUnit.Days"
Type="ChartCategoryAxisType.Date">
<ChartCategoryAxisLabels Format="d" />
</ChartCategoryAxis>
- The above contains the year, so another option is MonthDayPattern:
<ChartCategoryAxis BaseUnit="ChartCategoryAxisBaseUnit.Days"
Type="ChartCategoryAxisType.Date">
<ChartCategoryAxisLabels Format="@( CultureInfo.CurrentUICulture.DateTimeFormat.MonthDayPattern )" />
</ChartCategoryAxis>
- To display a shorter numeric month, use the MonthDayPattern to detect the day-month order and then set a custom format string.
Razor
<ChartCategoryAxis BaseUnit="ChartCategoryAxisBaseUnit.Days"
Type="ChartCategoryAxisType.Date">
<ChartCategoryAxisLabels Format="@( GetShortDayMonthPattern() )" />
</ChartCategoryAxis>C#
private string GetShortDayMonthPattern()
{
var mdp = CultureInfo.CurrentUICulture.DateTimeFormat.MonthDayPattern;
var separator = CultureInfo.CurrentUICulture.DateTimeFormat.DateSeparator;
string pattern = mdp.IndexOf("M") < mdp.IndexOf("d") ? $"MM{separator}dd" : $"dd{separator}MM";
return pattern;
}Regards, Author nickname Progress Telerik
I would like to visually distinguish a certain element in a series from the others if its value matches a given criteria (for example, value exceeds a threshold). Ideally, I'd want to add a hash to my bars, because I want to keep all items with the same color (I don't want to use the ColorField).
Something similar is available in Kendo: https://demos.telerik.com/kendo-ui/bar-charts/visuals.