chartjs-plugin-zoom

A zoom and pan plugin for Chart.js. Currently requires Chart.js >= 2.6.0

Panning can be done via the mouse or with a finger. Zooming is done via the mouse wheel or via a pinch gesture. Hammer.js is used for gesture recognition.

Live Codepen Demo

Installation

Run npm install --save chartjs-plugin-zoom to install with npm.

If including via a <script> tag, make sure to include Hammer.js as well:

<script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>

Configuration

To configure the zoom and pan plugin, you can simply add new config options to your chart config.

plugins: {
	zoom: {
		// Container for pan options
		pan: {
			// Boolean to enable panning
			enabled: true,

			// Panning directions. Remove the appropriate direction to disable
			// Eg. 'y' would only allow panning in the y direction
			// A function that is called as the user is panning and returns the
			// available directions can also be used:
			//   mode: function({ chart }) {
			//     return 'xy';
			//   },
			mode: 'xy',

			// Which of the enabled panning directions should only be available
			// when the mouse cursor is over one of scale.
			overScaleMode: 'xy',

			rangeMin: {
				// Format of min pan range depends on scale type
				x: null,
				y: null
			},
			rangeMax: {
				// Format of max pan range depends on scale type
				x: null,
				y: null
			},

			// On category scale, factor of pan velocity
			speed: 20,

			// Minimal pan distance required before actually applying pan
			threshold: 10,

			// Function called while the user is panning
			onPan: function({chart}) { console.log(`I'm panning!!!`); },
			// Function called once panning is completed
			onPanComplete: function({chart}) { console.log(`I was panned!!!`); }
		},

		// Container for zoom options
		zoom: {
			// Boolean to enable zooming
			enabled: true,

			// Enable drag-to-zoom behavior
			drag: true,

			// Drag-to-zoom effect can be customized
			// drag: {
			// 	 borderColor: 'rgba(225,225,225,0.3)'
			// 	 borderWidth: 5,
			// 	 backgroundColor: 'rgb(225,225,225)',
			// 	 animationDuration: 0
			// },

			// Zooming directions. Remove the appropriate direction to disable
			// Eg. 'y' would only allow zooming in the y direction
			// A function that is called as the user is zooming and returns the
			// available directions can also be used:
			//   mode: function({ chart }) {
			//     return 'xy';
			//   },
			mode: 'xy',

			// Which of the enabled zooming directions should only be available
			// when the mouse cursor is over one of scale.
			overScaleMode: 'xy',

			rangeMin: {
				// Format of min zoom range depends on scale type
				x: null,
				y: null
			},
			rangeMax: {
				// Format of max zoom range depends on scale type
				x: null,
				y: null
			},

			// Speed of zoom via mouse wheel
			// (percentage of zoom on a wheel event)
			speed: 0.1,

			// Minimal zoom distance required before actually applying zoom
			threshold: 2,

			// On category scale, minimal zoom level before actually applying zoom
			sensitivity: 3,

			// Function called while the user is zooming
			onZoom: function({chart}) { console.log(`I'm zooming!!!`); },
			// Function called once zooming is completed
			onZoomComplete: function({chart}) { console.log(`I was zoomed!!!`); }
		}
	}
}

API

chart.resetZoom()

Programmatically resets the zoom to the default state. See samples/zoom-time.html for an example.

Installation

To download a zip, go to the chartjs-plugin-zoom.js on Github

To install via npm / bower:

npm install chartjs-plugin-zoom --save

Prior to v0.4.0, this plugin was known as 'Chart.Zoom.js'. Old versions are still available on npm under that name.

Documentation

You can find documentation for Chart.js at www.chartjs.org/docs.

Examples for this plugin are available in the samples folder.

Contributing

Before submitting an issue or a pull request to the project, please take a moment to look over the contributing guidelines first.

License

chartjs-plugin-zoom.js is available under the MIT license.