Tooltip in Angular Chart component

Angular

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15 Oct 2021 / 6 minutes to read

Chart will display details about the points through tooltip, when the mouse is moved over the point.

By default, tooltip is not visible. Enable the tooltip by setting enable property to true and by injecting TooltipService into the NgModule.providers.

To known about tooltip, you can check on this video:

Source

Preview

app.component.ts

app.module.ts

main.ts

import { Component, OnInit } from '@angular/core';
import { toolData } from 'datasource.ts';
@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [tooltip]='tooltip'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='StepLine' xName='x' yName='y' width=2 name='China' [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 marker: Object;
    public tooltip: Object;
    ngOnInit(): void {
        this.chartData = toolData;
        this.primaryXAxis = {
            valueType: 'DateTime',
        };
        this.tooltip = { enable: true };
        this.marker = { visible: true, width: 10, height: 10 };
        this.title = 'Unemployment Rates 1975-2010';

}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { DateTimeService, StepLineSeriesService, ColumnSeriesService } from '@syncfusion/ej2-angular-charts';
import { LegendService, TooltipService, CategoryService } from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ DateTimeService, StepLineSeriesService, LegendService, TooltipService, CategoryService, ColumnSeriesService]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

By default, tooltip shows information of x and y value in points. In addition to that, you can show more information in tooltip. For example the format ’${series.name} ${point.x}’ shows series name and point x value.

Source

Preview

app.component.ts

app.module.ts

main.ts

import { Component, OnInit } from '@angular/core';
import { toolData } from 'datasource.ts';
@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [tooltip]='tooltip'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='StepLine' xName='x' yName='y' width=2 name='China' [marker]='marker'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis: Object;
    public chartData: Object[];
    public title: string;
    public marker: Object;
    public tooltip: Object;
    ngOnInit(): void {
        this.chartData = toolData;
        this.primaryXAxis = {
            valueType: 'DateTime'
        };
        this.tooltip = { enable: true, header: 'Unemployment', format: '<b>${point.x} : ${point.y}</b>' };
        this.marker = { visible: true, width: 10, height: 10 };
        this.title = 'Unemployment Rates 1975-2010';

}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { DateTimeService, StepLineSeriesService, ColumnSeriesService } from '@syncfusion/ej2-angular-charts';
import { LegendService, TooltipService, CategoryService } from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ DateTimeService, StepLineSeriesService, LegendService, TooltipService, CategoryService, ColumnSeriesService]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Individual Series Format

You can format the each series tooltip separately using series tooltipFormat property.

Note: If series tooltipFormat is given, it shows the tooltip for that series in that format, or else it will take tooltip format.

Source

Preview

app.component.ts

app.module.ts

main.ts

import { Component, OnInit } from '@angular/core';
import { toolData } from 'datasource.ts';
@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [tooltip]='tooltip'>
        <e-series-collection>
            <e-series [dataSource]='chartData1' type='Spline' xName='x' yName='y' width=2 name='Max Temp' [marker]='marker' tooltipFormat='${point.x}'></e-series>
            <e-series [dataSource]='chartData2' type='Spline' xName='x' yName='y' width=2 name='Avg Temp' [marker]='marker' tooltipFormat='${point.y}'></e-series>
            <e-series [dataSource]='chartData3' type='Spline' xName='x' yName='y' width=2 name='Min Temp' [marker]='marker'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis: Object;
    public chartData1: Object[];
    public chartData2: Object[];
    public chartData3: Object[];
    public tooltipFormat1: string;
    public tooltipFormat2: string;
    public title: string;
    public marker: Object;
    public tooltip: Object;
    ngOnInit(): void {
        this.chartData1 = [
                { x: 'Sun', y: 15 }, { x: 'Mon', y: 22 },
                { x: 'Tue', y: 32 },
                { x: 'Wed', y: 31 },
                { x: 'Thu', y: 29 }, { x: 'Fri', y: 24 },
                { x: 'Sat', y: 18 },
            ];
        this.chartData2 = [
                { x: 'Sun', y: 10 }, { x: 'Mon', y: 18 },
                { x: 'Tue', y: 28 },
                { x: 'Wed', y: 28 },
                { x: 'Thu', y: 26 }, { x: 'Fri', y: 20 },
                { x: 'Sat', y: 15 }
            ];
        this.chartData3 = [
                { x: 'Sun', y: 2 }, { x: 'Mon', y: 12 },
                { x: 'Tue', y: 22 },
                { x: 'Wed', y: 23 },
                { x: 'Thu', y: 19 }, { x: 'Fri', y: 13 },
                { x: 'Sat', y: 8 },
            ];
        this.primaryXAxis = {
            valueType: 'Category'
        };
        this.tooltip = { enable: true, header: 'Unemployment', format: '<b>${point.x} : ${point.y}</b>' };
        this.marker = { visible: true, width: 10, height: 10 };
        this.title = 'NC Weather Report - 2016';

}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { DateTimeService, StepLineSeriesService, ColumnSeriesService } from '@syncfusion/ej2-angular-charts';
import { LegendService, TooltipService, CategoryService } from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ DateTimeService, StepLineSeriesService, LegendService, TooltipService, CategoryService, ColumnSeriesService]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Any HTML elements can be displayed in the tooltip by using the ‘template’ property of the tooltip. You can use the ${x} and ${y} as place holders in the HTML element to display the x and y values of the corresponding data point.

Source

Preview

app.component.ts

app.module.ts

main.ts

import { Component, OnInit } from '@angular/core';
import { toolData } from 'datasource.ts';
@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [tooltip]='tooltip'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='StepLine' xName='x' yName='y' width=2 name='China' [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 marker: Object;
    public tooltip: Object;
    ngOnInit(): void {
        this.chartData = toolData;
        this.primaryXAxis = {
            valueType: 'DateTime'
        };
        this.tooltip = { enable: true, template: '#Unemployment' };
        this.marker = { visible: true, width: 10, height: 10 };
        this.title = 'Unemployment Rates 1975-2010';

}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { DateTimeService, StepLineSeriesService, ColumnSeriesService } from '@syncfusion/ej2-angular-charts';
import { LegendService, TooltipService, CategoryService } from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ DateTimeService, StepLineSeriesService, LegendService, TooltipService, CategoryService, ColumnSeriesService]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

By default, tooltip shows information of x and y value in points. You can show more information from data source in tooltip by using the tooltipMappingName property of the tooltip. You can use the ${point.tooltip} as place holders to display the specified tooltip content.

Source

Preview

app.component.ts

app.module.ts

main.ts

import { Component, OnInit } from '@angular/core';
import { toolData } from 'datasource.ts';
@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis' [title]='title' [tooltip]='tooltip'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Column' xName='x' yName='y' width=2 tooltipMappingName='country'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis: Object;
    public chartData: Object[];
    public title: string;
    public tooltip: Object;
    ngOnInit(): void {
        this.chartData =  [
                    { x: 'Germany', y: 72, country: 'GER: 72'},
                    { x: 'Russia', y: 103.1, country: 'RUS: 103.1'},
                    { x: 'Brazil', y: 139.1, country: 'BRZ: 139.1'},
                    { x: 'India', y: 462.1, country: 'IND: 462.1'},
                    { x: 'China', y: 721.4, country: 'CHN: 721.4'},
                    { x: 'United States Of America', y: 286.9, country: 'USA: 286.9'},
                    { x: 'Great Britain', y: 115.1, country: 'GBR: 115.1'},
                    { x: 'Nigeria', y: 97.2, country: 'NGR: 97.2'},
        ];
        this.primaryXAxis = {
             valueType: 'Category',
        };
        this.tooltip = {
               enable: true, format: '${point.tooltip}'
        };
        this.title = 'Internet Users in Million – 2016';

}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { DateTimeService, StepLineSeriesService, ColumnSeriesService } from '@syncfusion/ej2-angular-charts';
import { LegendService, TooltipService, CategoryService } from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ DateTimeService, StepLineSeriesService, LegendService, TooltipService, CategoryService, ColumnSeriesService]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

The fill and border properties are used to customize the background color and border of the tooltip respectively. The textStyle property in the tooltip is used to customize the font of the tooltip text.

Source

Preview

app.component.ts

app.module.ts

main.ts

import { Component, OnInit } from '@angular/core';
import { toolData } from 'datasource.ts';
@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [tooltip]='tooltip'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='StepLine' xName='x' yName='y' width=2 name='China' [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 marker: Object;
    public tooltip: Object;
    ngOnInit(): void {
        this.chartData = toolData;
        this.primaryXAxis = {
            valueType: 'DateTime'
        };
        this.tooltip = {
                enable: true,
                format: '${series.name} ${point.x} : ${point.y}',
                fill: '#7bb4eb',
                border: {
                   width: 2,
                   color: 'grey'
                }
        };
        this.marker = { visible: true, width: 10, height: 10 };
        this.title = 'Unemployment Rates 1975-2010';

}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule} from '@syncfusion/ej2-angular-charts';
import { DateTimeService, StepLineSeriesService, ColumnSeriesService } from '@syncfusion/ej2-angular-charts';
import { LegendService, TooltipService, CategoryService } from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ DateTimeService, StepLineSeriesService, LegendService, TooltipService, CategoryService, ColumnSeriesService]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Tooltip in Angular Chart component

Default Tooltip

Format the Tooltip

Individual Series Format

Tooltip Template

Tooltip Mapping Name

Customize the Appearance of Tooltip

See Also