Chart.js/docs/samples/animations/delay.md

# Delay

```js chart-editor
// <block:actions:2>
const actions = [
  {
    name: 'Randomize',
    handler(chart) {
      chart.data.datasets.forEach(dataset => {
        dataset.data = Utils.numbers({count: chart.data.labels.length, min: -100, max: 100});
      });
      chart.update();
    }
  },
];
// </block:actions>

// <block:setup:1>
const DATA_COUNT = 7;
const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};

const labels = Utils.months({count: 7});
const data = {
  labels: labels,
  datasets: [
    {
      label: 'Dataset 1',
      data: Utils.numbers(NUMBER_CFG),
      backgroundColor: Utils.CHART_COLORS.red,
    },
    {
      label: 'Dataset 2',
      data: Utils.numbers(NUMBER_CFG),
      backgroundColor: Utils.CHART_COLORS.blue,
    },
    {
      label: 'Dataset 3',
      data: Utils.numbers(NUMBER_CFG),
      backgroundColor: Utils.CHART_COLORS.green,
    },
  ]
};
// </block:setup>

// <block:config:0>
var delayed;
const config = {
  type: 'bar',
  data: data,
  options: {
    animation: {
      onComplete: () => {
        delayed = true;
      },
      delay: (context) => {
        let delay = 0;
        if (context.type === 'data' && context.mode === 'default' && !delayed) {
          delay = context.dataIndex * 300 + context.datasetIndex * 100;
        }
        return delay;
      },
    },
    scales: {
      x: {
        stacked: true,
      },
      y: {
        stacked: true
      }
    }
  }
};
// </block:config>

module.exports = {
  actions: actions,
  config: config,
};
```