chartjs-plugin-stacked100

This plugin for Chart.js that makes your bar chart to 100% stacked bar chart.

Requires Chart.js v3 or higher.

Demo: https://y-takey.github.io/chartjs-plugin-stacked100

Installation

npm

yarn add chartjs-plugin-stacked100

or

npm install chartjs-plugin-stacked100 --save

import { Chart } from "chart.js";
import ChartjsPluginStacked100 from "chartjs-plugin-stacked100";

Chart.register(ChartjsPluginStacked100);

CDN

<script src="https://cdn.jsdelivr.net/npm/chart.js@3.0.0/dist/chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-stacked100@1.0.0"></script>

Chart.register(ChartjsPluginStacked100.default);

Options

Name	Type	Default	Description
enable	boolean	false
replaceTooltipLabel	boolean	true	replace tooltip label automatically.
fixNegativeScale	boolean	true	when datasets has negative value and fixNegativeScale is false, the nagative scale is variable. (the range is between -100 and -1)
individual	boolean	false	scale the highest bar to 100%, and the rest would be proportional to the highest bar of a stack.
round	"off" | "down" | "up"	"off"	Use "off" to Math.round, "down" to Math.floor, and "up" to Math.ceil.
precision	number	1	precision of percentage. the range is between 0 and 16
axisId	string	-	This option allows you to stack only the axis in a chart that includes multiple axes. By default, the plugin will attempt to stack all axes

Usage

Basic

specify plugin options with { stacked100: { enable: true } }.

Use your tooltip label

specify plugin options with { stacked100: { enable: true, replaceTooltipLabel: false } }. and you can pass tooltip option.

new Chart(document.getElementById("my-chart"), {
  type: "bar",
  data: {},
  options: {
    tooltips: {
      callbacks: {
        label: (tooltipItem) => {
          const data = tooltipItem.chart.data;
          const datasetIndex = tooltipItem.datasetIndex;
          const index = tooltipItem.dataIndex;
          const datasetLabel = data.datasets[datasetIndex].label || "";
          // You can use two type values.
          // `data.originalData` is raw values,
          // `data.calculatedData` is percentage values, e.g. 20.5 (The total value is 100.0)
          const originalValue = data.originalData[datasetIndex][index];
          const rateValue = data.calculatedData[datasetIndex][index];

          return `${datasetLabel}: ${rateValue}% (raw ${originalValue})`;
        },
      },
    },
    plugins: {
      stacked100: { enable: true, replaceTooltipLabel: false },
    },
  },
});

Specify the precision of the percentage value

You can pass precision option. (default value is 1 ) For example, when you pass { stacked100: { enable: true, precision: 3 } }, the result is 0.123% .

Examples

new Chart(document.getElementById("my-chart"), {
  type: "bar",
  data: {
    labels: ["Foo", "Bar"],
    datasets: [
      { label: "bad", data: [5, 25], backgroundColor: "rgba(244, 143, 177, 0.6)" },
      { label: "better", data: [15, 10], backgroundColor: "rgba(255, 235, 59, 0.6)" },
      { label: "good", data: [10, 8], backgroundColor: "rgba(100, 181, 246, 0.6)" },
    ],
  },
  options: {
    indexAxis: "y",
    plugins: {
      stacked100: { enable: true },
    },
  },
});

Datapoints can be Objects

...
// line or bar charts
datasets: [
  { data: [{ y: 5 }, { y: 25 }] },
  { data: [{ y: 15 }, { y: 10 }] },
  { data: [{ y: 10 }, { y: 8 }] }
]

// horizontalBar charts
datasets: [
  { data: [{ x: 5 }, { x: 25 }] },
  { data: [{ x: 15 }, { x: 10 }] },
  { data: [{ x: 10 }, { x: 8 }] }
]
...

How to use datalabels plugin

new Chart(document.getElementById("my-chart"), {
  type: "bar",
  data: {},
  options: {
    plugins: {
      datalabels: {
        formatter: (_value, context) => {
          const data = context.chart.data;
          const { datasetIndex, dataIndex } = context;
          return `${data.calculatedData[datasetIndex][dataIndex]}% (${data.originalData[datasetIndex][dataIndex]})`;
        },
      },
      stacked100: { enable: true },
    },
  },
});

Use with React

npx create-react-app demo-react
cd demo-react
npm install react-chartjs-2 chartjs-plugin-stacked100 --save

Then use it:

import { Chart, Bar } from "react-chartjs-2";
import ChartjsPluginStacked100 from "chartjs-plugin-stacked100";

Chart.register(ChartjsPluginStacked100);

const ChartData = (props: any) => {
  return (
    <>
      {
        <div>
          <Bar
            data={{
              labels: ["Foo", "Bar"],
              datasets: [
                { label: "bad", data: [5, 25], backgroundColor: "rgba(244, 143, 177, 0.6)" },
                { label: "better", data: [15, 10], backgroundColor: "rgba(255, 235, 59, 0.6)" },
                { label: "good", data: [10, 8], backgroundColor: "rgba(100, 181, 246, 0.6)" },
              ],
            }}
            options={{
              //@ts-ignore
              indexAxis: "y",
              plugins: {
                stacked100: { enable: true },
              },
            }}
          />
        </div>
      }
    </>
  );
};
export default ChartData;

You can find a working example in the demo-react folder

Supported chart types

• bar
• line (via @HoJSim, thanks!)

Contributing

Pull requests and issues are always welcome.

For bugs and feature requests, please create an issue.

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request!

Development

• install: yarn install
• start dev server: yarn start
• unit test: yarn test:watch or yarn test
• publish the plugin: npm version (major|minor|patch) && npm publish
• check: yarn dev
• deploy to github pages: yarn gh