Tooltip in Angular Heatmap chart component
27 Apr 202416 minutes to read
Tooltip is used to provide the details of the heat map cell, and this can be displayed, while hovering the cursor over the cell or performing tap action in touch devices.
Default tooltip
You can enable the tooltip by setting the showTooltip property to true and injecting the Tooltip
module using the HeatMap.Inject(Tooltip)
.
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { HeatMapModule} from '@syncfusion/ej2-angular-heatmap'
import { TooltipService} from '@syncfusion/ej2-angular-heatmap'
import { Component, ViewEncapsulation } from '@angular/core';
@Component({
imports: [
HeatMapModule
],
providers: [TooltipService],
standalone: true,
selector: 'my-app',
template:
`<ejs-heatmap id='container' style="display:block;" [dataSource]='dataSource' [xAxis]='xAxis' [yAxis]='yAxis'
[titleSettings]='titleSettings' [cellSettings]='cellSettings' [showTooltip]='showTooltip'>
</ejs-heatmap>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent{
dataSource: Object[] = [
[0.72, 0.71, 0.71, 0.67, 0.72, 0.53, 0.53, 0.56, 0.58, 0.56],
[2.28, 2.29, 2.09, 1.84, 1.64, 1.49, 1.49, 1.39, 1.32, 1.23],
[2.02, 2.17, 2.30, 2.39, 2.36, 2.52, 2.62, 2.57, 2.57, 2.74],
[3.21, 3.26, 3.45, 3.47, 3.42, 3.34, 3.14, 2.83, 2.64, 2.61],
[3.22, 3.13, 3.04, 2.95, 2.69, 2.49, 2.27, 2.18, 2.06, 1.87],
[3.30, 3.39, 3.40, 3.48, 3.60, 3.67, 3.73, 3.79, 3.79, 4.07],
[5.80, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.00, 5.35, 5.47],
[6.91, 7.40, 8.13, 8.80, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]];
titleSettings: Object = {
text: 'Crude Oil Production of Non-OPEC Countries (in Million barrels per day)',
textStyle: {
size: '15px',
fontWeight: '500',
fontStyle: 'Normal',
fontFamily: 'Segoe UI'
}
};
xAxis: Object = {
labels: ['Canada', 'China', 'Egypt', 'Mexico', 'Norway', 'Russia', 'UK', 'USA']
};
yAxis: Object = {
labels: ['2000', '2001', '2002', '2003', '2004', '2005', '2006', '2007', '2008', '2009', '2010'],
};
public cellSettings: Object = {
showLabel: false,
};
public showTooltip: Boolean = true;
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));
Tooltip template
In heat map, you can customize the tooltip using the tooltipRender client-side event.
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { HeatMapModule} from '@syncfusion/ej2-angular-heatmap'
import { TooltipService} from '@syncfusion/ej2-angular-heatmap'
import { Component, ViewEncapsulation } from '@angular/core';
import { ITooltipEventArgs } from '@syncfusion/ej2-angular-heatmap';
@Component({
imports: [
HeatMapModule
],
providers: [TooltipService],
standalone: true,
selector: 'my-app',
template:
`<ejs-heatmap id='container' style="display:block;" [dataSource]='dataSource' [xAxis]='xAxis' [yAxis]='yAxis'
[titleSettings]='titleSettings' [cellSettings]='cellSettings' (tooltipRender)='tooltipRender($event)'>
</ejs-heatmap>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent{
dataSource: Object[] = [
[0.72, 0.71, 0.71, 0.67, 0.72, 0.53, 0.53, 0.56, 0.58, 0.56],
[2.28, 2.29, 2.09, 1.84, 1.64, 1.49, 1.49, 1.39, 1.32, 1.23],
[2.02, 2.17, 2.30, 2.39, 2.36, 2.52, 2.62, 2.57, 2.57, 2.74],
[3.21, 3.26, 3.45, 3.47, 3.42, 3.34, 3.14, 2.83, 2.64, 2.61],
[3.22, 3.13, 3.04, 2.95, 2.69, 2.49, 2.27, 2.18, 2.06, 1.87],
[3.30, 3.39, 3.40, 3.48, 3.60, 3.67, 3.73, 3.79, 3.79, 4.07],
[5.80, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.00, 5.35, 5.47],
[6.91, 7.40, 8.13, 8.80, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]];
titleSettings: Object = {
text: 'Crude Oil Production of Non-OPEC Countries (in Million barrels per day)',
textStyle: {
size: '15px',
fontWeight: '500',
fontStyle: 'Normal',
fontFamily: 'Segoe UI'
}
};
xAxis: Object = {
labels: ['Canada', 'China', 'Egypt', 'Mexico', 'Norway', 'Russia', 'UK', 'USA']
};
yAxis: Object = {
labels: ['2000', '2001', '2002', '2003', '2004', '2005', '2006', '2007', '2008', '2009', '2010'],
};
public cellSettings: Object = {
showLabel: false,
};
public showTooltip: Boolean = true;
public tooltipRender(args: ITooltipEventArgs): void {
args.content = ['In ' + args.yLabel + ', the ' + args.xLabel + ' produced ' + args.value + ' million barrels per day'];
};
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));
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.
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { HeatMapModule} from '@syncfusion/ej2-angular-heatmap'
import { TooltipService} from '@syncfusion/ej2-angular-heatmap'
import { Component, ViewEncapsulation } from '@angular/core';
import { ITooltipEventArgs } from '@syncfusion/ej2-angular-heatmap';
@Component({
imports: [
HeatMapModule
],
providers: [TooltipService],
standalone: true,
selector: 'my-app',
template:
`<ejs-heatmap id='container' style="display:block;" [dataSource]='dataSource' [xAxis]='xAxis' [yAxis]='yAxis'
[titleSettings]='titleSettings' [cellSettings]='cellSettings' [paletteSettings]='paletteSettings' [tooltipSettings]='tooltipSettings' (tooltipRender)='tooltipRender($event)'>
</ejs-heatmap>`,
encapsulation: ViewEncapsulation.None
})
export class AppComponent{
dataSource: Object[] = [
[0.72, 0.71, 0.71, 0.67, 0.72, 0.53, 0.53, 0.56, 0.58, 0.56],
[2.28, 2.29, 2.09, 1.84, 1.64, 1.49, 1.49, 1.39, 1.32, 1.23],
[2.02, 2.17, 2.30, 2.39, 2.36, 2.52, 2.62, 2.57, 2.57, 2.74],
[3.21, 3.26, 3.45, 3.47, 3.42, 3.34, 3.14, 2.83, 2.64, 2.61],
[3.22, 3.13, 3.04, 2.95, 2.69, 2.49, 2.27, 2.18, 2.06, 1.87],
[3.30, 3.39, 3.40, 3.48, 3.60, 3.67, 3.73, 3.79, 3.79, 4.07],
[5.80, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.00, 5.35, 5.47],
[6.91, 7.40, 8.13, 8.80, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]];
titleSettings: Object = {
text: 'Crude Oil Production of Non-OPEC Countries (in Million barrels per day)',
textStyle: {
size: '15px',
fontWeight: '500',
fontStyle: 'Normal',
fontFamily: 'Segoe UI'
}
};
xAxis: Object = {
labels: ['Canada', 'China', 'Egypt', 'Mexico', 'Norway', 'Russia', 'UK', 'USA']
};
yAxis: Object = {
labels: ['2000', '2001', '2002', '2003', '2004', '2005', '2006', '2007', '2008', '2009', '2010'],
};
public cellSettings: Object = {
showLabel: false,
};
public paletteSettings: Object = {
palette: [
{ color: '#F0ADCE'},
{ color: '#19307B'},
],
};
public tooltipSettings: Object = {
fill: '#696295',
textStyle: {
color: '#FFFFFF',
size: '12px'
},
border: {
width: 2,
color: '#F0C27B'
}
};
public showTooltip: Boolean = true;
public tooltipRender(args: ITooltipEventArgs): void {
args.content = ['In ' + args.yLabel + ', the ' + args.xLabel + ' produced ' + args.value + ' million barrels per day'];
};
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));
Note: To use tooltip feature, we need to inject
Tooltip
usingHeatMap.Inject(Tooltip)
.