Chart.js Plugin Labels for Chart.js v4+

Chart.js plugin to display labels on pie, doughnut and polar area chart. Forked from emn178/chartjs-plugin-labels.

Demo

• Demo from the original repo using Chart.js v2.x, but it's almost the same.

Download

• Compressed
• Uncompressed

CDN Link

You can put the below link in the script tag

https://unpkg.com/chart.js-plugin-labels-dv/dist/chartjs-plugin-labels.min.js

Install from NPM

• npm i chart.js-plugin-labels-dv

Usage

JavaScript

new Chart(ctx, {
  type: type,
  data: data,
  options: {
    plugins: {
      labels: {
        // render 'label', 'value', 'percentage', 'image' or custom function, default is 'percentage'
        render: 'value',
        // precision for percentage, default is 0
        precision: 0,
        // identifies whether or not labels of value 0 are displayed, default is false
        showZero: true,
        // font size, default is defaultFontSize
        fontSize: 12,
        // font color, can be color array for each data or function for dynamic color, default is defaultFontColor
        fontColor: '#fff',
        // font style, default is defaultFontStyle
        fontStyle: 'normal',
        // font family, default is defaultFontFamily
        fontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
        // draw text shadows under labels, default is false
        textShadow: true,
        // text shadow intensity, default is 6
        shadowBlur: 10,
        // text shadow X offset, default is 3
        shadowOffsetX: -5,
        // text shadow Y offset, default is 3
        shadowOffsetY: 5,
        // text shadow color, default is 'rgba(0,0,0,0.3)'
        shadowColor: 'rgba(255,0,0,0.75)',
        // draw label in arc, default is false
        // bar chart ignores this
        arc: true,
        // position to draw label, available value is 'default', 'border' and 'outside'
        // bar chart ignores this
        // default is 'default'
        position: 'default',
        // draw label even it's overlap, default is true
        // bar chart ignores this
        overlap: true,
        // show the real calculated percentages from the values and don't apply the additional logic to fit the percentages to 100 in total, default is false
        showActualPercentages: true,
        // set images when `render` is 'image'
        images: [
          {
            src: 'image.png',
            width: 16,
            height: 16
          }
        ],
        // add padding when position is `outside`
        // default is 2
        outsidePadding: 4,
        // add margin of text when position is `outside` or `border`
        // default is 2
        textMargin: 4
      }
    }
  }
});

// custom render
{
  render: function (args) {
    // args will be something like:
    // { label: 'Label', value: 123, percentage: 50, index: 0, dataset: {...} }
    return '$' + args.value;
    // return object if it is image
    // return { src: 'image.png', width: 16, height: 16 };
  }
}

// dynamic fontColor
{
  fontColor: function (args) {
    // args will be something like:
    // { index: 0, dataset: {...} }
    return myColorTransfer(args.dataset.backgroundColor[index]);
  }
}

Support multiple options, eg.

labels: [
  {
    render: 'label',
    position: 'outside'
  },
  {
    render: 'value'
  }
]

Default options

Chart.defaults.plugins.labels = {
  // ...
};

React

From #5 (comment)

import React from 'react';
import { Chart } from 'chart.js';
import * as helpers from 'chart.js/helpers';

export const LabelPluginProvider: React.FC = ({ children }) => {
  React.useEffect(() => {
    window.Chart = Chart;
    Chart.helpers = helpers;
    import('chart.js-plugin-labels-dv');
  }, []);
  return children;
};

Vue

From #2 (comment)

import { Chart as ChartJS } from 'chart.js'
import { getChartLabelPlugin } from 'chart.js-plugin-labels-dv'
ChartJS.register(getChartLabelPlugin())

Or, from #2 (comment)

import Chart from "chart.js/auto";
import * as helpers from "chart.js/helpers";

Then inside the created() hook:

async created() {
  window.Chart = Chart;
  Chart.helpers = helpers;
  awaitimport("chart.js-plugin-labels-dv");
}

Angular

Codesandbox example

You would need to create your own chart component.

<div class="chart">
  <canvas [id]="name"></canvas>
</div>

Importing should be straightforward

import Chart from 'chart.js/auto';
import { getChartLabelPlugin, PLUGIN_ID } from 'chart.js-plugin-labels-dv';

@Input() chartConfig: any;
@Output() chartCreated: EventEmitter<Chart> = new EventEmitter<Chart>();

public readonly name: string = `chart-${ChartComponent.instanceCount++}`;
private chart: Chart;

ngAfterViewInit(): void {
  this.createChart();
}

private createChart(): void {
  if (!this.hasRegisteredPlugin()) {
    Chart.register(getChartLabelPlugin());
  }
    
  this.chart = new Chart(this.name, this.chartConfig);
  this.chartCreated.emit(this.chart);
}

private hasRegisteredPlugin(): boolean {
    return !!Chart.registry?.plugins.get(PLUGIN_ID);
}

For fixing the module failed compilation error I have updated tsconfig as follows:

Error: Module build failed (from ./node_modules/@ngtools/webpack/src/ivy/index.js):
Error: /node_modules/chart.js-plugin-labels-dv/src/chart-label.ts is missing from the TypeScript compilation.
Please make sure it is in your tsconfig via the 'files' or 'include' property.

tsconfig.json

"files": [
  ...
  "node_modules/chart.js-plugin-labels-ed/src/chart-label.ts"
],

Test it out with data from the official Chart.js website: https://www.chartjs.org/docs/latest/charts/doughnut.html#pie

License

MIT license.

Contact

The project's website is located at https://github.com/emn178/chartjs-plugin-labels
Authors: Chen, Yi-Cyuan ([email protected]), Davide Violante, eduard-landclan