ng2-charts

What is ng2-charts?

ng2-charts is an Angular wrapper for Chart.js, providing a way to create and manage various types of charts in Angular applications. It simplifies the integration of Chart.js into Angular projects by offering Angular components and directives.

What are ng2-charts's main functionalities?

Line Chart

This feature allows you to create a line chart using ng2-charts. The code sample demonstrates how to set up the chart data, labels, options, colors, and type in an Angular component.

{"template":"<canvas baseChart [datasets]=\"lineChartData\" [labels]=\"lineChartLabels\" [options]=\"lineChartOptions\" [colors]=\"lineChartColors\" [legend]=\"lineChartLegend\" [chartType]=\"lineChartType\"></canvas>","component":"import { Component } from '@angular/core';\n\n@Component({\n  selector: 'app-line-chart',\n  templateUrl: './line-chart.component.html'\n})\nexport class LineChartComponent {\n  public lineChartData: Array<any> = [\n    { data: [65, 59, 80, 81, 56, 55, 40], label: 'Series A' },\n    { data: [28, 48, 40, 19, 86, 27, 90], label: 'Series B' }\n  ];\n  public lineChartLabels: Array<any> = ['January', 'February', 'March', 'April', 'May', 'June', 'July'];\n  public lineChartOptions: any = {\n    responsive: true\n  };\n  public lineChartColors: Array<any> = [\n    { // grey\n      backgroundColor: 'rgba(148,159,177,0.2)',\n      borderColor: 'rgba(148,159,177,1)',\n      pointBackgroundColor: 'rgba(148,159,177,1)',\n      pointBorderColor: '#fff',\n      pointHoverBackgroundColor: '#fff',\n      pointHoverBorderColor: 'rgba(148,159,177,0.8)'\n    },\n    { // dark grey\n      backgroundColor: 'rgba(77,83,96,0.2)',\n      borderColor: 'rgba(77,83,96,1)',\n      pointBackgroundColor: 'rgba(77,83,96,1)',\n      pointBorderColor: '#fff',\n      pointHoverBackgroundColor: '#fff',\n      pointHoverBorderColor: 'rgba(77,83,96,1)'\n    }\n  ];\n  public lineChartLegend: boolean = true;\n  public lineChartType: string = 'line';\n}"}

Bar Chart

This feature allows you to create a bar chart using ng2-charts. The code sample demonstrates how to set up the chart data, labels, options, and type in an Angular component.

{"template":"<canvas baseChart [datasets]=\"barChartData\" [labels]=\"barChartLabels\" [options]=\"barChartOptions\" [colors]=\"barChartColors\" [legend]=\"barChartLegend\" [chartType]=\"barChartType\"></canvas>","component":"import { Component } from '@angular/core';\n\n@Component({\n  selector: 'app-bar-chart',\n  templateUrl: './bar-chart.component.html'\n})\nexport class BarChartComponent {\n  public barChartOptions: any = {\n    scaleShowVerticalLines: false,\n    responsive: true\n  };\n  public barChartLabels: string[] = ['2006', '2007', '2008', '2009', '2010', '2011', '2012'];\n  public barChartType: string = 'bar';\n  public barChartLegend: boolean = true;\n  public barChartData: any[] = [\n    { data: [65, 59, 80, 81, 56, 55, 40], label: 'Series A' },\n    { data: [28, 48, 40, 19, 86, 27, 90], label: 'Series B' }\n  ];\n}"}

Pie Chart

This feature allows you to create a pie chart using ng2-charts. The code sample demonstrates how to set up the chart data, labels, and type in an Angular component.

{"template":"<canvas baseChart [data]=\"pieChartData\" [labels]=\"pieChartLabels\" [chartType]=\"pieChartType\"></canvas>","component":"import { Component } from '@angular/core';\n\n@Component({\n  selector: 'app-pie-chart',\n  templateUrl: './pie-chart.component.html'\n})\nexport class PieChartComponent {\n  public pieChartLabels: string[] = ['Download Sales', 'In-Store Sales', 'Mail Sales'];\n  public pieChartData: number[] = [300, 500, 100];\n  public pieChartType: string = 'pie';\n}"}

Other packages similar to ng2-charts

ngx-charts

ngx-charts is a declarative charting framework for Angular2 and beyond. It uses D3.js under the hood and provides a variety of chart types. Compared to ng2-charts, ngx-charts offers more customization options and is built specifically for Angular, whereas ng2-charts is a wrapper around Chart.js.

angular-google-charts

angular-google-charts is an Angular wrapper for the Google Charts library. It allows you to create a wide range of charts using Google's charting tools. Compared to ng2-charts, angular-google-charts provides access to Google's extensive charting capabilities and is ideal for users who prefer Google Charts.

ng-apexcharts

ng-apexcharts is an Angular wrapper for ApexCharts, a modern charting library that offers a variety of chart types and extensive customization options. Compared to ng2-charts, ng-apexcharts provides more modern and interactive charting features.

README

ng2-charts slack

Beautiful charts for Angular based on Chart.js

Usage & Demo

Samples using ng2-charts

https://valor-software.com/ng2-charts/

Installation

You can install ng2-charts by using the Angular CLI:

ng add ng2-charts

The required packages will be automatically installed, and your app.config.ts will be updated with the required changes to start using the library right away.

Manual install through package managers

• You can install ng2-charts using npm:

  npm install ng2-charts --save
  

  or yarn:

  yarn add ng2-charts --save
  

• You will also need to install and include Chart.js library in your application (it is a peer dependency of this library, more info can be found in the official chart.js documentation)

  npm install chart.js --save
  

  or with yarn:

  yarn add  chart.js --save
  

• Import the directive in your standalone component:

  import { BaseChartDirective } from 'ng2-charts';
  
  @Component({
    standalone: true,
    imports: [BaseChartDirective],
  })
  export class MyComponent {}
  

• Provide a configuration, typically in your main.ts:

  import { provideCharts, withDefaultRegisterables } from 'ng2-charts';
  
  bootstrapApplication(AppComponent, {
    providers: [provideCharts(withDefaultRegisterables())],
  }).catch((err) => console.error(err));
  

  Alternatively, include a minimal configuration to reduce the bundle size, eg:

  provideCharts({ registerables: [BarController, Legend, Colors] });
  

  Or in your AppModule:

  import { provideCharts, withDefaultRegisterables } from 'ng2-charts';
  
  @NgModule({
    providers: [provideCharts(withDefaultRegisterables())],
    bootstrap: [AppComponent],
  })
  export class AppModule {}
  

Angular version compatibility table

	ng2-chart version
Angular version	v1.x	v2.x	v3.x	v4.x	v5.x	v6.x
2 - 9	✓
10		✓
11		✓
12		✓
13			✓
14			✓	✓
15			✓	✓
16					✓
17					✓	✓

Stackblitz Starting Templates

• Line Chart - https://stackblitz.com/github/santam85/ng2-charts-line-template?preset=node
• Pie Chart - https://stackblitz.com/github/santam85/ng2-charts-pie-template?preset=node
• Bar Chart - https://stackblitz.com/github/santam85/ng2-charts-bar-template?preset=node
• Doughnut Chart - https://stackblitz.com/github/santam85/ng2-charts-doughnut-template?preset=node
• Radar Chart - https://stackblitz.com/github/santam85/ng2-charts-radar-template?preset=node
• Polar Area Chart - https://stackblitz.com/github/santam85/ng2-charts-polar-area-template?preset=node
• Bubble Chart - https://stackblitz.com/github/santam85/ng2-charts-bubble-template?preset=node
• Scatter Chart - https://stackblitz.com/github/santam85/ng2-charts-scatter-template?preset=node

API

Chart types

There is one directive for all chart types: baseChart, and there are 8 types of charts: line, bar, radar, pie , polarArea, doughnut, bubble and scatter. You can use the directive on a canvas element as follows:

<canvas baseChart [data]="barChartData" [options]="barChartOptions" [type]="'bar'"> </canvas>

Properties

Note: For more information about possible options please refer to original chart.js documentation

• type: (ChartType) - indicates the type of chart, it can be: line, bar, radar, pie, polarArea, doughnut or any custom type added to Chart.js
• data: (ChartData<TType, TData, TLabel>) - the whole data structure to be rendered in the chart. Support different flexible formats and parsing options, see here. In alternative, and depending on the type of your chart, you can use the labels and datasets properties to specify individual options.
• labels: (TLabel[]) - Datasets labels. It's necessary for charts: line, bar and radar. And just labels (on hover) for charts: polarArea, pie and doughnut. Labels are matched in order with the datasets array.
• datasets: ( ChartDataset<TType, TData>[]) - Same as the datasets property of the data input. See here for details.
• options: (ChartOptions<TType>) - chart options (as per chart.js documentation).
• legend: (boolean = false) - if true, chart legend is shown.

Events

• chartClick: fires when click on a chart has occurred, returns information regarding active points and labels
• chartHover: fires when mousemove (hover) on a chart has occurred, returns information regarding active points and labels

Colors

By default, this library uses the colors as defined by Chart.js. If you need more control on colors, eg: generating colors on the fly, see the advanced color palettes.

Dynamic Theming

The ThemeService allows clients to set a structure specifying colors override settings. This service may be called when the dynamic theme changes, with colors which fit the theme. The structure is interpreted as an override, with special functionality when dealing with arrays. Example:

type Theme = 'light-theme' | 'dark-theme';

private _selectedTheme: Theme = 'light-theme';
public get selectedTheme(){
  return this._selectedTheme;
}

public set selectedTheme(value){
  this._selectedTheme = value;
  let overrides: ChartOptions;
  if (this.selectedTheme === 'dark-theme') {
    overrides = {
      legend: {
        labels: { fontColor: 'white' }
      },
      scales: {
        xAxes: [ {
          ticks: { fontColor: 'white' },
          gridLines: { color: 'rgba(255,255,255,0.1)' }
        } ],
        yAxes: [ {
          ticks: { fontColor: 'white' },
          gridLines: { color: 'rgba(255,255,255,0.1)' }
        } ]
      }
    };
  } else {
    overrides = {};
  }
  this.themeService.setColorschemesOptions(overrides);
}

constructor(private themeService: ThemeService<AppChartMetaConfig>){
}

setCurrentTheme(theme: Theme){
  this.selectedTheme = theme;
}

The overrides object has the same type as the chart options object ChartOptions, and wherever a simple field is encountered it replaces the matching field in the options object. When an array is encountered (as in the xAxes and yAxes fields above), the single object inside the array is used as a template to override all array elements in the matching field in the options object. So in the case above, every axis will have its ticks and gridline colors changed.

Troubleshooting

Please follow this guidelines when reporting bugs and feature requests:

• Use GitHub Issues board to report bugs and feature requests ( not our email address)
• Please always write steps to reproduce the error. That way we can focus on fixing the bug, not scratching our heads trying to reproduce it.

Thanks for understanding!

License

The MIT License (see the LICENSE file for the full text)

If you like this library and want to say thanks, consider buying me a coffee!