Selection in Angular Chart component

27 Feb 202524 minutes to read

Chart provides selection support for the series and its data points on mouse click.

When Mouse is clicked on the data points, the corresponding series legend will also be selected.

We have different type of selection mode for selecting the data. They are,

  • None
  • Point
  • Series
  • Cluster
  • DragXY
  • DragX
  • DragY

Point

You can select a point, by setting selectionMode to point.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule} from '@syncfusion/ej2-angular-charts'
import { CategoryService, ColumnSeriesService} from '@syncfusion/ej2-angular-charts'
import { LegendService, SelectionService } from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { selectionData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, ColumnSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryXAxis' [title]='title' selectionMode='Point'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold' ></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='silver' name='Silver'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='bronze' name='Bronze' ></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    ngOnInit(): void {
        this.chartData = selectionData;
        this.primaryXAxis = {
           valueType: 'Category',
           title: 'Countries'
        };
        this.title = 'Olympic Medals';
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}
.chartSelection1 {
    fill:red;
}

.chartSelection2 {
    fill: green;
}

.chartSelection3 {
    fill: blue;
}

Note: To use select feature, we need to Inject SelectionService into the NgModule.providers.

Series

You can select a series, by setting selectionMode to series.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule} from '@syncfusion/ej2-angular-charts'
import { CategoryService, ColumnSeriesService} from '@syncfusion/ej2-angular-charts'
import { LegendService, SelectionService } from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { selectionData } from './datasource';

@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, ColumnSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' selectionMode='Series'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold' ></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='silver' name='Silver'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='bronze' name='Bronze' ></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = selectionData;
        this.primaryXAxis = {
           valueType: 'Category'
        };
        this.title = 'Olympic Medals';
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}
.chartSelection1 {
    fill:red;
}

.chartSelection2 {
    fill: green;
}

.chartSelection3 {
    fill: blue;
}

Cluster

You can select the points that corresponds to the same index in all the series, by setting selectionMode to cluster.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule} from '@syncfusion/ej2-angular-charts'
import { CategoryService, ColumnSeriesService} from '@syncfusion/ej2-angular-charts'
import { LegendService, SelectionService } from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { selectionData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, ColumnSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' selectionMode='Cluster'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold' ></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='silver' name='Silver'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='bronze' name='Bronze' ></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = selectionData;
        this.primaryXAxis = {
           valueType: 'Category',
           title: 'Countries'
        };
        this.title = 'Olympic Medals';
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}
.chartSelection1 {
    fill:red;
}

.chartSelection2 {
    fill: green;
}

.chartSelection3 {
    fill: blue;
}

Rectangular selection

DragXY, DragX and DragY

To fetch the collection of data under a particular region, you have to set selectionMode as DragXY.

  • DragXY - Allows us to select data with respect to horizontal and vertical axis.
  • DragX - Allows us to select data with respect to horizontal axis.
  • DragY - Allows us to select data with respect to vertical axis.

The selected data’s are returned as an array collection in the [dragComplete]
(https://ej2.syncfusion.com/angular/documentation/api/chart/iDragCompleteEventArgs/) event.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { ScatterSeriesService, LegendService, SelectionService} from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { ChartData } from './chartdata.service';

@Component({
imports: [
         ChartModule
    ],

providers: [ ScatterSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' selectionMode='DragXY'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Scatter' xName='x' yName='y' name='Male' opacity=0.7 [marker]='marker'></e-series>
            <e-series [dataSource]='series2' type='Scatter' xName='x' yName='y' name='Female' opacity=0.7 [marker]='marker'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    public series1?: Object;
    public series2?: Object;
    public marker?: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            title: 'Height (cm)',
            minimum: 120, maximum: 180,
            edgeLabelPlacement: 'Shift',
            labelFormat: '{value}cm'
        };
        this.primaryYAxis = {
            title: 'Weight (kg)',
            minimum: 60, maximum: 90,
            labelFormat: '{value}kg',
            rangePadding: 'None'
        };
        this.title = 'Height Vs Weight';
        this.marker = {  width: 10, height: 10 };
        this.series1 = ChartData.prototype.getScatterData().series1;
        this.series2 = ChartData.prototype.getScatterData().series2;
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}

Lasso selection

To select a region by drawing freehand shapes to fetch a collection of data use selectionMode as Lasso. You can also select multiple regions on the chart through this mode.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { ScatterSeriesService, LegendService, SelectionService} from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { ChartData } from './chartdata.service';

@Component({
imports: [
         ChartModule
    ],

providers: [ ScatterSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' selectionMode='Lasso'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Scatter' xName='x' yName='y' name='Male' opacity=0.7 [marker]='marker'></e-series>
            <e-series [dataSource]='series2' type='Scatter' xName='x' yName='y' name='Female' opacity=0.7 [marker]='marker'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    public series1?: Object;
    public series2?: Object;
    public marker?: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            title: 'Height (cm)',
            minimum: 120, maximum: 180,
            edgeLabelPlacement: 'Shift',
            labelFormat: '{value}cm'
        };
        this.primaryYAxis = {
            title: 'Weight (kg)',
            minimum: 60, maximum: 90,
            labelFormat: '{value}kg',
            rangePadding: 'None'
        };
        this.title = 'Height Vs Weight';
        this.marker = {  width: 10, height: 10 };
        this.series1 = ChartData.prototype.getScatterData().series1;
        this.series2 = ChartData.prototype.getScatterData().series2;
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}

Multi-region selection

To select multiple region on the chart, set the allowMultiSelection property to true.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { ScatterSeriesService, LegendService, SelectionService} from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { ChartData } from './chartdata.service';

@Component({
imports: [
         ChartModule
    ],

providers: [ ScatterSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' selectionMode='DragXY' allowMultiSelection='true'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Scatter' xName='x' yName='y' name='Male' opacity=0.7 [marker]='marker'></e-series>
            <e-series [dataSource]='series2' type='Scatter' xName='x' yName='y' name='Female' opacity=0.7 [marker]='marker'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    public series1?: Object;
    public series2?: Object;
    public marker?: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            title: 'Height (cm)',
            minimum: 120, maximum: 180,
            edgeLabelPlacement: 'Shift',
            labelFormat: '{value}cm'
        };
        this.primaryYAxis = {
            title: 'Weight (kg)',
            minimum: 60, maximum: 90,
            labelFormat: '{value}kg',
            rangePadding: 'None'
        };
        this.title = 'Height Vs Weight';
        this.marker = {  width: 10, height: 10 };
        this.series1 = ChartData.prototype.getScatterData().series1;
        this.series2 = ChartData.prototype.getScatterData().series2;
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}

Selection type

You can select multiple points or series, by enabling the isMultiSelect property.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule} from '@syncfusion/ej2-angular-charts'
import { CategoryService, ColumnSeriesService} from '@syncfusion/ej2-angular-charts'
import { LegendService, SelectionService } from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { selectionData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, ColumnSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' selectionMode='Point' isMultiSelect='true'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold' ></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='silver' name='Silver'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='bronze' name='Bronze' ></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = selectionData;
        this.primaryXAxis = {
           valueType: 'Category',
           title: 'Countries'
        };
        this.title = 'Olympic Medals';
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}
.chartSelection1 {
    fill:red;
}

.chartSelection2 {
    fill: green;
}

.chartSelection3 {
    fill: blue;
}

Selection on load

You can able to select a point or series programmatically on a chart using selectedDataIndexes property.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule} from '@syncfusion/ej2-angular-charts'
import { CategoryService, ColumnSeriesService} from '@syncfusion/ej2-angular-charts'
import { LegendService, SelectionService } from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { selectionData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, ColumnSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'
            selectionMode='Point' isMultiSelect='true' [selectedDataIndexes]='selectedData'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold' selectionStyle='chartSelection1' [animation]='animation'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='silver' name='Silver' selectionStyle='chartSelection2' [animation]='animation'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='bronze' name='Bronze' selectionStyle='chartSelection3' [animation]='animation'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    public animation?: Object;
    public selectedData?: Object[];
    ngOnInit(): void {
        this.chartData = selectionData;
        this.primaryXAxis = {
           valueType: 'Category',
           title: 'Countries'
        };
        this.animation = { enable: false};
        this.selectedData = [
        { series: 0, point: 1}, { series: 2, point: 3}
    ];
        this.title = 'Olympic Medals';
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}
.chartSelection1 {
    fill:red;
}

.chartSelection2 {
    fill: green;
}

.chartSelection3 {
    fill: blue;
}

Selection through on legend

You can able to select a point or series through on legend using toggleVisibility property. Also, use enableHighlight property for highlighting the series through legend.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule} from '@syncfusion/ej2-angular-charts'
import { CategoryService, ColumnSeriesService} from '@syncfusion/ej2-angular-charts'
import { LegendService, SelectionService } from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { selectionData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, ColumnSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'
       [legendSettings]='legendSettings'  selectionMode='Point'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold' selectionStyle='chartSelection1' [animation]='animation'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='silver' name='Silver' selectionStyle='chartSelection2' [animation]='animation'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='bronze' name='Bronze' selectionStyle='chartSelection3' [animation]='animation'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    public animation?: Object;
    public selectedData?: Object[];
    public legendSettings?: Object;
    ngOnInit(): void {
        this.chartData = selectionData;
        this.primaryXAxis = {
           valueType: 'Category',
           title: 'Countries'
        };
        this.animation = { enable: false};
        this.legendSettings = { visible: true,  toggleVisibility: false, enableHighlight: true };
        this.title = 'Olympic Medals';
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}
.chartSelection1 {
    fill:red;
}

.chartSelection2 {
    fill: green;
}

.chartSelection3 {
    fill: blue;
}

Customization for selection

You can apply custom style to selected points or series with selectionStyle property.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule} from '@syncfusion/ej2-angular-charts'
import { CategoryService, ColumnSeriesService} from '@syncfusion/ej2-angular-charts'
import { LegendService, SelectionService } from '@syncfusion/ej2-angular-charts'




import { Component, OnInit } from '@angular/core';
import { selectionData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, ColumnSeriesService, LegendService, SelectionService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' selectionMode='Point' isMultiSelect='true'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold' selectionStyle='chartSelection1'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='silver' name='Silver' selectionStyle='chartSelection2'></e-series>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='bronze' name='Bronze' selectionStyle='chartSelection3'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = selectionData;
        this.primaryXAxis = {
           valueType: 'Category',
           title: 'Countries'
        };
        this.title = 'Olympic Medals';
    }

}
#loader {
    color: #008cff;
    font-family:  'Helvetica Neue','calibiri';
    font-size:16px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}
.animation {
    background: #333333;
    border: 1px solid #cecece;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

#chart-container {
    display: block;
    height: 350px;
}
.chartSelection1 {
    fill:red;
}

.chartSelection2 {
    fill: green;
}

.chartSelection3 {
    fill: blue;
}

See Also