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Tooltip in Angular Chart component

22 Jul 2021 / 6 minutes to read

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

Default Tooltip

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
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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';

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

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

Format the Tooltip

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
Copied to clipboard
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';

}
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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 { }
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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
Copied to clipboard
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';

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

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

Tooltip Template

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
Copied to clipboard
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';

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

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

Tooltip Mapping Name

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
Copied to clipboard
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';

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

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

Customize the Appearance of Tooltip

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
Copied to clipboard
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';

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

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

See Also