chartjs / Chartjs Plugin Deferred

Chart.js plugin to defer initial chart updates until the user scrolls and the canvas appears inside the viewport, and thus trigger the initial chart animations when the user is likely to see them.

Requires Chart.js 2.6.0 or later.

Documentation

• Installation
• Options
• Samples

Example

new Chart(ctx, {
  // ... data ...
  options: {
    // ... other options ...
    plugins: {
      deferred: {
        xOffset: 150,   // defer until 150px of the canvas width are inside the viewport
        yOffset: '50%', // defer until 50% of the canvas height are inside the viewport
        delay: 500      // delay of 500 ms after the canvas is considered inside the viewport
      }
    }
  }
});

Development

You first need to install node dependencies (requires Node.js):

> npm install

The following commands will then be available from the repository root:

> gulp build            // build dist files
> gulp build --watch    // build and watch for changes
> gulp lint             // perform code linting
> gulp docs             // generate GitBook documentation (`dist/docs`)
> gulp samples          // prepare samples for release (`dist/samples`)
> gulp package          // create an archive with dist files and samples
> gulp netlify          // prepare Netlify artifacts (`dist/www`)

License

chartjs-plugin-deferred is available under the MIT license.