Cross hair and track ball in Angular Chart component

10 Apr 202524 minutes to read

Crosshair has a vertical and horizontal line to view the value of the axis at mouse or touch position.

Crosshair lines can be enabled by using enable property in the crosshair.

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




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

@Component({
imports: [
         ChartModule
    ],

providers: [ DateTimeService, LineSeriesService, LegendService, CrosshairService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [legendSettings]='legend' [crosshair]='crosshair'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Line' xName='x' yName='y' name='Temperature'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public series1?: Object[];
    public crosshair?: Object;
    public title?: string;
    public primaryYAxis?: Object;
    public legend?: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            valueType: 'DateTime',
            labelFormat: 'yMMM'
        };
        this.crosshair = { enable: true };
        this.series1 = ChartData.prototype.getCrosshairData().series1;
        this.legend = { visible: true };
        this.title = 'Weather Condition';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Tooltip for axis

Tooltip label for an axis can be enabled by using enable
property of crosshairTooltip in the corresponding axis.

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




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

@Component({
imports: [
         ChartModule
    ],

providers: [ DateTimeService, LineSeriesService, LegendService, CrosshairService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [legendSettings]='legend' [crosshair]='crosshair'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Line' xName='x' yName='y' name='Temperature'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public series1?: Object[];
    public majorGridLines?: Object;
    public crosshair?: Object;
    public title?: string;
    public primaryYAxis?: Object;
    public legend?: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            valueType: 'DateTime',
            crosshairTooltip: { enable: true },
            labelFormat: 'yMMM'
        };
        this.primaryYAxis = {
            crosshairTooltip: { enable: true }
        };
        this.crosshair = { enable: true };
        this.series1 = ChartData.prototype.getCrosshairData().series1;
        this.legend = { visible: true };
        this.title = 'Weather Condition';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Customization

The fill and textStyle property of the crosshairTooltip is used to customize the background color and font style of the crosshair label respectively. Color and width of the crosshair line can be customized by using the line property in the crosshair.

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




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

@Component({
imports: [
         ChartModule
    ],

providers: [ DateTimeService, LineSeriesService, LegendService, CrosshairService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [legendSettings]='legend' [crosshair]='crosshair'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Line' xName='x' yName='y' name='Temperature'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public series1?: Object[];
    public crosshair?: Object;
    public title?: string;
    public primaryYAxis?: Object;
    public legend?: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            valueType: 'DateTime',
            crosshairTooltip: { enable: true, fill: 'green' },
            labelFormat: 'yMMM'
        };
        this.primaryYAxis = {
            crosshairTooltip: { enable: true, fill: 'green' }
        };
        this.crosshair = { enable: true, line: {width: 2, color: 'green'}, fill: 'green' };
        this.series1 = ChartData.prototype.getCrosshairData().series1;
        this.series1 = ChartData.prototype.getCrosshairData().series2;
        this.legend = { visible: true};
        this.title = 'Weather Condition';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Note: To use crosshair feature, we need to inject CrosshairService into the NgModule.providers.

Snap to data

Enabling the snapToData property in the crosshair aligns it with the nearest data point instead of following the exact mouse position.

import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { DateTimeService, LineSeriesService, TooltipService, CrosshairService, LegendService } from '@syncfusion/ej2-angular-charts';
import { Component, OnInit } from '@angular/core';
import { chartData } from './datasource';

@Component({
    imports: [ChartModule],
    providers: [DateTimeService, LineSeriesService, TooltipService, CrosshairService, LegendService],
    standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis' [primaryYAxis]='primaryYAxis' [title]='title' [crosshair]='crosshair' [tooltip]='tooltip' [legendSettings]='legendSettings'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='John' width='2' [marker]='marker'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public primaryYAxis?: Object;
    public chartData?: Object[];
    public crosshair?: Object;
    public title?: string;
    public tooltip?: Object;
    public marker?: Object;
    public legendSettings?: Object;
    ngOnInit(): void {
        this.chartData = chartData;
        this.primaryXAxis = {
            title: 'Years',
            minimum: new Date(2000, 1, 1), maximum: new Date(2006, 2, 11),
            intervalType: 'Years',
            valueType: 'DateTime',
            lineStyle: { width: 0 },
            majorGridLines: { width: 0 },
            edgeLabelPlacement: 'Shift'
        };
        this.primaryYAxis = {
            title: 'Revenue in Millions',
            labelFormat: '{value}M',
            majorTickLines: { width: 0 },
            minimum: 10, maximum: 60,
            lineStyle: { width: 0 }
        };
        this.crosshair = { enable: true, lineType: 'Horizontal', snapToData: true };
        this.tooltip = { enable: true, shared: true, format: '${series.name} : ${point.x} : ${point.y}' };
        this.title = 'Average Sales per Person';
        this.marker = { visible: true };
        this.legendSettings = { visible: false };
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Trackball

Trackball is used to track a data point closest to the mouse or touch position. Trackball marker indicates the closest point and trackball tooltip displays the information about the point. To use trackball feature, we need to inject CrosshairService and TooltipService into the NgModule.providers.

Trackball can be enabled by setting the enable property of the crosshair to true and shared property in tooltip to true in chart.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { DateTimeService, LineSeriesService } from '@syncfusion/ej2-angular-charts'
import { LegendService, DataLabelService, TooltipService, CrosshairService } from '@syncfusion/ej2-angular-charts'




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

@Component({
imports: [
         ChartModule
    ],

providers: [ DateTimeService, LineSeriesService, LegendService, DataLabelService,
                 TooltipService, CrosshairService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [crosshair]='crosshair' [tooltip]='tooltip'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='John' width=2 [marker]='marker'></e-series>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y1' name='Andrew' width=2 [marker]='marker'></e-series>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y2' name='Thomas' width=2 [marker]='marker'></e-series>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y3' name='Mark' width=2 [marker]='marker'></e-series>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y4' name='William' width=2 [marker]='marker'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public primaryYAxis?: Object;
    public chartData?: Object[];
    public crosshair?: Object;
    public title?: string;
    public tooltip?: Object;
    public marker?: Object;
    ngOnInit(): void {
        this.chartData = [
            { x: new Date(2000, 2, 11), y: 15, y1: 39, y2: 60, y3: 75, y4: 85 },
            { x: new Date(2000, 9, 14), y: 20, y1: 30, y2: 55, y3: 75, y4: 83 },
            { x: new Date(2001, 2, 11), y: 25, y1: 28, y2: 48, y3: 68, y4: 85 },
            { x: new Date(2001, 9, 16), y: 21, y1: 35, y2: 57, y3: 75, y4: 87 },
            { x: new Date(2002, 2, 7), y: 13, y1: 39, y2: 62, y3: 71, y4: 82 },
            { x: new Date(2002, 9, 7), y: 18, y1: 41, y2: 64, y3: 69, y4: 74 },
            { x: new Date(2003, 2, 11), y: 24, y1: 45, y2: 57, y3: 81, y4: 73 },
            { x: new Date(2003, 9, 14), y: 23, y1: 48, y2: 53, y3: 84, y4: 75 },
            { x: new Date(2004, 2, 6), y: 19, y1: 54, y2: 63, y3: 85, y4: 73 },
            { x: new Date(2004, 9, 6), y: 31, y1: 55, y2: 50, y3: 87, y4: 60 },
            { x: new Date(2005, 2, 11), y: 39, y1: 57, y2: 66, y3: 75, y4: 48 },
            { x: new Date(2005, 9, 11), y: 50, y1: 60, y2: 65, y3: 70, y4: 55 },
            { x: new Date(2006, 2, 11), y: 24, y1: 60, y2: 79, y3: 85, y4: 40 }
        ];
        this.primaryXAxis = {
            title: 'Years',
            minimum: new Date(2000, 1, 1), maximum: new Date(2006, 2, 11),
            intervalType: 'Years',
            valueType: 'DateTime',
        };
        this.tooltip = { enable: true, shared: true, format: '${series.name} : ${point.x} : ${point.y}' };
        this.crosshair = { enable: true, lineType: 'Vertical' };
        this.marker = { visible: true };
        this.title = 'Average Sales per Person';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

To known about Crosshair and Trackball, you can check on this video:

Crosshair highlight

The highlightCategory property in the crosshair highlights the background of the entire category when hovered over. The crosshair color can be customized using the color property within the line configuration.

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



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

@Component({
imports: [
         ChartModule
    ],

providers: [ CategoryService, BarSeriesService, ColumnSeriesService, LineSeriesService,LegendService, DataLabelService, MultiLevelLabelService, SelectionService, CrosshairService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [crosshair]='crosshair' >
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='country' yName='gold' name='Gold'></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 crosshair?: Object;
    ngOnInit(): void {
        this.chartData = [
             { country: "USA", gold: 50 },
             { country: "China", gold: 40 },
             { country: "Japan", gold: 70 },
             { country: "Australia", gold: 60 },
             { country: "France", gold: 50 },
             { country: "Germany", gold: 40 },
             { country: "Italy", gold: 40 },
             { country: "Sweden", gold: 30, silver: 25 }
        ];
        this.primaryXAxis = {
            valueType: 'Category',
            title: 'Countries'
        };
        this.crosshair = { enable: true, line: { color: 'red' }, lineType: 'Vertical', highlightCategory: true };
        this.primaryYAxis = {
            minimum: 0, maximum: 80,
            interval: 20, title: 'Medals'
        };
        this.title = 'Olympic Medals';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));