README.md

react-chartjs-2

React wrapper for Chart.js 2 Open for PRs and contributions!

UPDATE to 2.x

As of 2.x we have made chart.js a peer dependency for greater flexibility. Please add chart.js as a dependency on your project to use 2.x. Currently, 2.4.x is the recommended version of chart.js to use.

Looking for Contributors!

Actively looking for contributors as for the moment I do not have enough time to dedicate for maintaining this lib. All contributors can add themselves to Contributors section at the bottom of README.

Demo & Examples

Live demo: gor181.github.io/react-chartjs-2

To build the examples locally, run:

npm install
npm start

Then open localhost:8000 in a browser.

Installation via NPM

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

Usage

Check example/src/components/* for usage.

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

<Doughnut data={...} />

Properties

• data: (PropTypes.object | PropTypes.func).isRequired,
• width: PropTypes.number,
• height: PropTypes.number,
• legend: PropTypes.object,
• options: PropTypes.object,
• redraw: PropTypes.bool,
• getDatasetAtEvent: PropTypes.func,
• getElementAtEvent: PropTypes.func,
• getElementsAtEvent: PropTypes.func
• onElementsClick: PropTypes.func, // alias for getElementsAtEvent (backward compatibility)

Custom size

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

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

Chart.js instance

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

render() {
	componentDidMount() {
		console.log(this.refs.chart.chart_instance); // returns a Chart.js instance reference
	}
	return (
		<Doughnut ref='chart' data={data} />
	)
}

Getting context for data generation

Canvas node and hence context, that can be used to create CanvasGradient background, is passed as argument to data if given as 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
			...
		}
	}

	return (
		<Line data={data} />
	)
}

Chart.js Defaults

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

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

// Disable animating charts by default.
defaults.global.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 'react-chartjs-2';
import merge from 'lodash.merge';
// or
// import { merge } from 'lodash';

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

Chart.js object

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

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

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

Events

onElementsClick || getElementsAtEvent (function)

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

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

getElementAtEvent (function)

Calling getElementAtEvent(event) on your Chart instance passing an argument of an event, or jQuery event, will return the single element at the event position. If there are multiple items within range, only the first is returned Check

{
	getElementAtEvent: (elems) => {},
  // => returns the first element at the event point.
}

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
}

Development (src, lib and the build process)

NOTE: The source code for the component is in src. A transpiled CommonJS version (generated with Babel) is available in lib 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.

To build, watch and serve the examples (which will also watch the component source), run npm start. If you just want to watch changes to src and rebuild lib, run npm run watch (this is useful if you are working with npm link).

Thanks

Jed Watson for making react-component yo builder!

License

MIT Licensed Copyright (c) 2016 Goran Udosic

Contributors

Jeremy Ayerst @jerairrest