DxChart<T>.SelectionChanged Event
Fires when point or series selection changes.
Namespace: DevExpress.Blazor
Assembly: DevExpress.Blazor.v24.2.dll
NuGet Package: DevExpress.Blazor
Declaration
[Parameter]
public Action<ChartSelectionChangedEventArgs> SelectionChanged { get; set; }
Event Data
The SelectionChanged event's data class is ChartSelectionChangedEventArgs. The following properties provide information specific to this event:
Property | Description |
---|---|
IsPointSelected | Identifies whether a point is selected. |
IsSeriesSelected | Identifies whether a series is selected. |
Point | Returns the last point that is clicked (selected or deselected). |
Series | Returns the clicked series or the series to which the clicked point belongs. |
Remarks
Use the SeriesSelectionMode or PointSelectionMode property to enable series or point selection in the <DxChart>
component.
The SelectionChanged
event fires when a user selects/deselects a series/point or you call the following methods:
Example
The following example obtains an argument and value of a selected point:
@page "/"
@using System.Drawing
@using System.Diagnostics
<DxChart Data="@dataPoints"
Width=500 Height=300
PointSelectionMode=ChartSelectionMode.Single
SelectionChanged="@OnSelectionChanged">
<DxChartLineSeries ArgumentField="@((DataPoint i) => i.Arg)"
ValueField="@((DataPoint i) => i.Value1)"
Name="Series 1"
HoverMode=ChartContinuousSeriesHoverMode.None>
<DxChartSeriesPoint HoverMode=ChartSeriesPointHoverMode.None
SelectionMode=ChartSeriesPointSelectionMode.Point />
</DxChartLineSeries>
</DxChart>
<br/><br/>
@if (Selection != null) {
<div id="selection-args">
<table>
<tr> <td>Selected Point Argument:</td><td> @Selection.Point.Argument</td> </tr>
<tr> <td>Selected Point Value:</td><td> @Selection.Point.Value</td> </tr>
</table>
</div>
}
@code {
ChartSelectionChangedEventArgs Selection { get; set; }
private DataPoint[] dataPoints;
protected override void OnInitialized() {
dataPoints = GetDataPoints();
}
void OnSelectionChanged(ChartSelectionChangedEventArgs selectionArgs) {
Selection = selectionArgs;
StateHasChanged();
}
public class DataPoint {
public string Arg { get; set; }
public int Value1 { get; set; }
public int Value2 => (int)(Value1 * 1.2);
public double Value3 { get; set; }
}
public DataPoint[] GetDataPoints() {
DataPoint[] dataPoints = new DataPoint[] {
new DataPoint() { Arg = "I", Value1 = 26, Value3 = 23},
new DataPoint() { Arg = "II", Value1 = 24, Value3 = 23},
new DataPoint() { Arg = "III", Value1 = 25, Value3 = 24},
new DataPoint() { Arg = "IV", Value1 = 27, Value3 = 29},
new DataPoint() { Arg = "V", Value1 = 28, Value3 = 30},
};
return dataPoints;
}
}
See Also