API
The selection capability is not provided out of the box, but it can be implemented using the pointClick event. The following code gives an example for the scenario when a click on a point selects it, and a subsequent click on the same point clears the selection. To check whether the point is already selected, its isSelected() method is called.
jQuery
$(function() { $("#chartContainer").dxChart({ // ... onPointClick: function (e) { var point = e.target; if (point.isSelected()) { point.clearSelection(); } else { point.select(); } } }); });
Angular
<dx-chart (onPointClick)="onPointClick($event)"> </dx-chart>
import { DxChartModule } from "devextreme-angular"; // ... export class AppComponent { onPointClick (e) { const point = e.target; if (point.isSelected()) { point.clearSelection(); } else { point.select(); } }; } @NgModule({ imports: [ // ... DxChartModule ], // ... })
Vue
<template> <DxChart @point-click="onPointClick($event)" ... > </DxChart> </template> <script> import DxChart from 'devextreme-vue/chart'; export default { components: { DxChart }, methods: { onPointClick (e) { const point = e.target; if (point.isSelected()) { point.clearSelection(); } else { point.select(); } } } } </script>
React
import React from 'react'; import Chart from 'devextreme-react/chart'; class App extends React.Component { render() { return ( <Chart onPointClick={this.onPointClick} ... > </Chart> ); } onPointClick (e) { const point = e.target; if (point.isSelected()) { point.clearSelection(); } else { point.select(); } } } export default App;
In the previous code example, selection was cleared of a specific point. If you need to clear selection of all points in a series, you can use the deselectPoint(point) method of that series.
jQuery
$(function() { $("#chartContainer").dxChart({ // ... onPointClick: function (e) { e.target.series.getAllPoints(function(point) { series.deselectPoint(point); }); } }); });
Angular
<dx-chart (onPointClick)="onPointClick($event)"> </dx-chart>
import { DxChartModule } from "devextreme-angular"; // ... export class AppComponent { onPointClick (e) { e.target.series.getAllPoints(point => series.deselectPoint(point)); } } @NgModule({ imports: [ // ... DxChartModule ], // ... })
Vue
<template> <DxChart @point-click="onPointClick($event)" ... > </DxChart> </template> <script> import DxChart from 'devextreme-vue/chart'; export default { components: { DxChart }, methods: { onPointClick (e) { e.target.series.getAllPoints(point => series.deselectPoint(point)); } } } </script>
React
import React from 'react'; import Chart from 'devextreme-react/chart'; class App extends React.Component { render() { return ( <Chart onPointClick={this.onPointClick} ... > </Chart> ); } onPointClick (e) { e.target.series.getAllPoints(point => series.deselectPoint(point)); } } export default App;
If you need to clear selection of all series in the Chart along with their points, call the clearSelection() method of the Chart instance.
jQuery
$("#chartContainer").dxChart("clearSelection");
Angular
import { ..., ViewChild } from "@angular/core"; import { DxChartModule, DxChartComponent } from "devextreme-angular"; // ... export class AppComponent { @ViewChild(DxChartComponent, { static: false }) chart: DxChartComponent; // Prior to Angular 8 // @ViewChild(DxChartComponent) chart: DxChartComponent; clearSelection() { this.chart.instance.clearSelection(); } } @NgModule({ imports: [ // ... DxChartModule ], // ... })
Vue
<template> <DxChart ref="chart" ... > </DxChart> </template> <script> import DxChart from 'devextreme-vue/chart'; export default { components: { DxChart }, methods: { clearSelection () { this.$refs.chart.instance.clearSelection(); } } } </script>
React
import React from 'react'; import Chart from 'devextreme-react/chart'; class App extends React.Component { constructor(props) { super(props); this.chartRef = React.createRef(); } render() { return ( <Chart ref={this.chartRef} ... > </Chart> ); } clearSelection () { this.chartRef.current.instance.clearSelection(); } } export default App;
See Also
- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout
- Access a Series Point Using the API
- Access a Series Using the API
- Series Selection Using the API
User Interaction
When a user selects a series point, it changes its style to the one specified by the following objects.
series.point.selectionStyle
The selection style for all points of an individual series.commonSeriesSettings.point.selectionStyle
The selection style for all series points in the Chart.
Individual series settings override common settings.
jQuery
$(function() { $("#chartContainer").dxChart({ // ... series: { point: { selectionStyle: { // high priority } } }, commonSeriesSettings: { point: { selectionStyle: { // low priority } } } }); });
Angular
<dx-chart ... > <dxi-series ... > <dxo-point> <dxo-selection-style> <!-- high priority --> </dxo-selection-style> </dxo-point> </dxi-series> <dxo-common-series-settings ... > <dxo-point> <dxo-selection-style> <!-- low priority --> </dxo-selection-style> </dxo-point> </dxo-common-series-settings> </dx-chart>
import { DxChartModule } from "devextreme-angular"; // ... export class AppComponent { // ... } @NgModule({ imports: [ // ... DxChartModule ], // ... })
Vue
<template> <DxChart ... > <DxSeries> <DxPoint ... > <DxSelectionStyle> <!-- high priority --> </DxSelectionStyle> </DxPoint> </DxSeries> <DxCommonSeriesSettings ... > <DxPoint ... > <DxSelectionStyle> <!-- low priority --> </DxSelectionStyle> </DxPoint> </DxCommonSeriesSettings> </DxChart> </template> <script> import DxChart, { DxCommonSeriesSettings, DxSeries, DxPoint, DxSelectionStyle } from 'devextreme-vue/chart'; export default { components: { DxChart, DxCommonSeriesSettings, DxSeries, DxPoint, DxSelectionStyle } } </script>
React
import React from 'react'; import Chart, { CommonSeriesSettings, Series, Point, SelectionStyle } from 'devextreme-react/chart'; class App extends React.Component { render() { return ( <Chart ... > <Series> <Point ... > <SelectionStyle> {/* high priority */} </SelectionStyle> </Point> </Series> <CommonSeriesSettings ... > <Point ... > <SelectionStyle> {/* low priority */} </SelectionStyle> </Point> </CommonSeriesSettings> </Chart> ); } } export default App;
To choose which elements should be highlighted when a user selects a point, specify the selectionMode property. Just like selectionStyle, this property can be specified for all points belonging to an individual series or for all series points in the Chart.
jQuery
$(function() { $("#chartContainer").dxChart({ // ... commonSeriesSettings: { point: { selectionMode: 'allArgumentPoints' // or 'onlyPoint' | 'allSeriesPoints' | 'none' } } }); });
Angular
<dx-chart ... > <dxo-common-series-settings ... > <dxo-point selectionMode="allArgumentPoints"> <!-- or 'onlyPoint' | 'allSeriesPoints' | 'none' --> </dxo-point> </dxo-common-series-settings> </dx-chart>
import { DxChartModule } from "devextreme-angular"; // ... export class AppComponent { // ... } @NgModule({ imports: [ // ... DxChartModule ], // ... })
Vue
<template> <DxChart ... > <DxCommonSeriesSettings ... > <DxPoint selection-mode="allArgumentPoints"/> <!-- or 'onlyPoint' | 'allSeriesPoints' | 'none' --> </DxCommonSeriesSettings> </DxChart> </template> <script> import DxChart, { DxCommonSeriesSettings, DxPoint } from 'devextreme-vue/chart'; export default { components: { DxChart, DxCommonSeriesSettings, DxPoint } } </script>
React
import React from 'react'; import Chart, { CommonSeriesSettings, Point } from 'devextreme-react/chart'; class App extends React.Component { render() { return ( <Chart ... > <CommonSeriesSettings ... > <Point selectionMode="allArgumentPoints" /> {/* or 'onlyPoint' | 'allSeriesPoints' | 'none' */} </CommonSeriesSettings> </Chart> ); } } export default App;
By default, only a single point can be in the selected state at a time. If you need to allow multiple points to be in this state, assign "multiple" to the pointSelectionMode property.
jQuery
$(function() { $("#chartContainer").dxChart({ // ... pointSelectionMode: 'multiple' // or 'single' }); });
Angular
<dx-chart pointSelectionMode="multiple"> <!-- or 'single' --> </dx-chart>
import { DxChartModule } from "devextreme-angular"; // ... export class AppComponent { // ... } @NgModule({ imports: [ // ... DxChartModule ], // ... })
Vue
<template> <DxChart ... point-selection-mode="multiple"> <!-- or 'single' --> </DxChart> </template> <script> import DxChart from 'devextreme-vue/chart'; export default { components: { DxChart } } </script>
React
import React from 'react'; import Chart from 'devextreme-react/chart'; class App extends React.Component { render() { return ( <Chart ... pointSelectionMode="multiple"> {/* or 'single' */} </Chart> ); } } export default App;
See Also
Events
When a user selects a series point, the Chart fires the pointSelectionChanged event that you can handle with a function. If the handling function is not going to be changed during the lifetime of the UI component, assign it to the onPointSelectionChanged property when you configure the UI component. To check whether a point was selected or the selection was cleared, call the isSelected() method of the point.
jQuery
$(function() { $("#chartContainer").dxChart({ // ... onPointSelectionChanged: function (e) { var point = e.target; if (point.isSelected()) { // Commands to execute when the point is selected } else { // Commands to execute when the selection is cleared } } }); });
Angular
<dx-chart (onPointSelectionChanged)="onPointSelectionChanged($event)"> </dx-chart>
import { DxChartModule } from "devextreme-angular"; // ... export class AppComponent { onPointSelectionChanged (e) { const point = e.target; if (point.isSelected()) { // Commands to execute when the point is selected } else { // Commands to execute when the selection is cleared } }; } @NgModule({ imports: [ // ... DxChartModule ], // ... })
Vue
<template> <DxChart @point-selection-changed="onPointSelectionChanged($event)" ... > </DxChart> </template> <script> import DxChart from 'devextreme-vue/chart'; export default { components: { DxChart }, methods: { onPointSelectionChanged (e) { const point = e.target; if (point.isSelected()) { // Commands to execute when the point is selected } else { // Commands to execute when the selection is cleared } } } } </script>
React
import React from 'react'; import Chart from 'devextreme-react/chart'; class App extends React.Component { render() { return ( <Chart onPointSelectionChanged={this.onPointSelectionChanged} ... > </Chart> ); } onPointSelectionChanged (e) { const point = e.target; if (point.isSelected()) { // Commands to execute when the point is selected } else { // Commands to execute when the selection is cleared } } } export default App;
If you are going to change the event handler at runtime, or if you need to attach several handlers to the pointSelectionChanged event, subscribe to this event using the on(eventName, eventHandler) method. This approach is more typical of jQuery.
var pointSelectionChangedHandler1 = function (e) { var point = e.target; // First handler of the "pointSelectionChanged" event }; var pointSelectionChangedHandler2 = function (e) { var point = e.target; // Second handler of the "pointSelectionChanged" event }; $("#chartContainer").dxChart("instance") .on("pointSelectionChanged", pointSelectionChangedHandler1) .on("pointSelectionChanged", pointSelectionChangedHandler2);
See Also
- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout
- Series Selection Events
- Chart API Reference
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