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@iftek/react-chartjs-3

React wrapper for Chart.js 3

Open for PRs and contributions!

Demo & Examples

npm install --save react-chartjs-2 chart.js

# or

yarn add react-chartjs-2 chart.js
We recommend using chart.js ^3.0.0

Usage

import { Doughnut } from 'react-chartjs-2';

<Doughnut data={...} />

Examples

Live: reactchartjs.github.io/react-chartjs-2

See these examples for more information

npm install --save @iftek/react-chartjs-3 chart.js

Chart props

yarn add @iftek/react-chartjs-3 chart.js

id

Type string Default: undefined

ID attribute applied to the rendered canvas

import { Doughnut } from '@iftek/react-chartjs-3';

Type `string`
Default: `undefined`

class attribute applied to the rendered canvas

#### height

Type: `number`
Default: `150`

Height attribute applied to the rendered canvas

#### width

Type: `number`
Default: `300`

Width attribute applied to the rendered canvas

#### redraw

Type: `boolean`
Default: `false`

If true, will tear down and redraw chart on all updates

#### type

Type: `'line' | 'bar' | 'horizontalBar' | 'radar' | 'doughnut' | 'polarArea' | 'bubble' | 'pie' | 'scatter'`

Chart.js chart type (required only on ChartComponent)

#### data (required)

Type: `Chart.ChartData | (canvas: HTMLCanvasElement | null) => Chart.ChartData`

The data object that is passed into the Chart.js chart ([more info](https://www.chartjs.org/docs/latest/getting-started/)).

This can also be a function, that receives a canvas element and returns the data object.

```tsx
const data = canvas => {
    const ctx = canvas.getContext('2d');
    const g = ctx.createLinearGradient(...);

    return {
        datasets: [{
            backgroundColor: g,
            // ...the rest
        }],
    };
}

options

  • data: (PropTypes.object | PropTypes.func).isRequired,
  • width: PropTypes.number,
  • height: PropTypes.number,
  • id: PropTypes.string,
  • legend: PropTypes.object,
  • options: PropTypes.object,
  • redraw: PropTypes.bool,
  • getElementsAtEventForMode: PropTypes.func

The options object that is passed into the Chart.js chart (more info)

fallbackContent

Type: React.ReactNode

A fallback for when the canvas cannot be rendered. Can be used for accessible chart descriptions (more info)

plugins

Type: Chart.PluginServiceRegistrationOptions[]

The plugins array that is passed into the Chart.js chart (more info)

getDatasetAtEvent

Type: (dataset: Array<{}>, event: React.MouseEvent<HTMLCanvasElement>) => void Default: undefined

Proxy for Chart.js getDatasetAtEvent. Calls with dataset and triggering event

getElementAtEvent

Type: (element: [{}], event: React.MouseEvent<HTMLCanvasElement>) => void Default: undefined

Proxy for Chart.js getElementAtEvent. Calls with single element array and triggering event

getElementsAtEvent

Type: (elements: Array<{}>, event: React.MouseEvent<HTMLCanvasElement>) => void Default: undefined

Proxy for Chart.js getElementsAtEvent. Calls with element array and triggering event

FAQ

Why doesn't my chart maintain it's width/height?

In order for Chart.js to obey the custom size you need to set maintainAspectRatio to false

<Bar
	data={data}
	width={100}
	height={50}
	options={{ maintainAspectRatio: false }}
/>

How do I access my chart's instance?

The Chart.js instance can be accessed by placing a ref to the element as:

const App => {
  const ref = useRef();

  return <Doughnut ref={ref} data={data} options={options} />;
};

How do I acess the canvas context?

The canvas node and hence context can be accessed within the data function. This approach is useful when you want to keep your components pure.

render() {
  const data = (canvas) => {
    const ctx = canvas.getContext('2d')
    const gradient = ctx.createLinearGradient(0,0,100,0);

    return {
      backgroundColor: gradient
      // ...the rest
    }
  }

  return <Line data={data} />;
}

Additional Information

Defaults

Chart.js defaults can be set by importing the defaults object:

import { defaults } from '@iftek/react-chartjs-3';

// Disable animating charts by default.
defaults.animation = false;

If you want to bulk set properties, try using the lodash.merge function. This function will do a deep recursive merge preserving previously set values that you don't want to update.

import { defaults } from '@iftek/react-chartjs-3';
import merge from 'lodash.merge';

merge(defaults, {
	animation: false,
  line: {
    borderColor: '#F85F73',
  }
});
``` -->

<!-- ### Chart.js object

You can access the internal Chart.js object to register plugins or extend charts like this:

```JavaScript
import { Chart } from '@iftek/react-chartjs-3';

componentWillMount() {
  Chart.register({
    afterDraw: function (chart, easing) {
      // Plugin code.
    }
  });
}

Scatter Charts

If you're using Chart.js 2.6 and below, add the showLines: false property to your chart options. This was later added in the default config, so users of later versions would not need to do this extra step.

Events

getElementsAtEventForMode (function)

A function to be called when mouse clicked on chart elements, will return all element at that point as an array. Check

{
  getElementsAtEventForMode: (elems) => {},
  // `elems` is an array of chartElements
}

getDatasetAtEvent (function)

Looks for the element under the event point, then returns all elements from that dataset. This is used internally for 'dataset' mode highlighting Check

{
  getDatasetAtEvent: (dataset) => {}
  // `dataset` is an array of chartElements
}

Working with Multiple Datasets

You will find that any event which causes the chart to re-render, such as hover tooltips, etc., will cause the first dataset to be copied over to other datasets, causing your lines and bars to merge together. This is because to track changes in the dataset series, the library needs a key to be specified - if none is found, it can't tell the difference between the datasets while updating. To get around this issue, you can take these two approaches:

  1. Add a label property on each dataset. By default, this library uses the label property as the key to distinguish datasets.
  2. Specify a different property to be used as a key by passing a datasetKeyProvider prop to your chart component, which would return a unique string value for each dataset.

Development

NOTE: The source code for the component is in src. A transpiled CommonJS version (generated with Babel) is available in dist for use with node.js, browserify and webpack. A UMD bundle is also built to dist, which can be included without the need for any build system.

License

MIT Licensed Copyright (c) 2021 Iftek