根据日期绘制持续时间的 Chart.js

Question

I am trying to create a chart with dates ( MMMM DD, YYYY ) on the x axis, and duration ( h:mm:ss ) on the y axis. The below code supports dates (x) but not durations (y).

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: [moment("2009-04-11").format('MMMM DD, YYYY')],
        datasets: [{
            data: [{
                x: "2009-04-11",
                y: "01:20"
            }],
            backgroundColor: [
                'rgba(255, 99, 132, 0.2)',
            ],
            borderColor: [
                'rgba(255, 99, 132, 1)',
            ],
            borderWidth: 1
        }]
    },
    options: {
        scales: {
            yAxes: [{
            type: 'time',
                time: {
                    unit: 'minute'
                }
            }]
        }
    }
});

Answer 1

The following example illustrates how it can be done. I assume the y value '01:20' from your code to be of format 'HH:mm' .

 const data = [ { x: '2009-04-11', y: '01:20' }, { x: '2009-05-02', y: '01:40' }, { x: '2009-05-18', y: '01:10' } ]; new Chart(document.getElementById('myChart'), { type: 'line', data: { datasets: [{ label: 'My Dataset', data: data.map(o => ({ x: ox, y: moment.duration(oy) })), backgroundColor: 'rgba(255, 99, 132, 0.2)', borderColor: 'rgba(255, 99, 132, 1)', borderWidth: 1 }] }, options: { tooltips: { callbacks: { label: (tooltipItem, data) => moment.utc(data.labels[tooltipItem.index]).format('HH:mm') } }, scales: { yAxes: [{ ticks: { beginAtZero: true, stepSize: 1_200_000, callback: v => moment.utc(v).format('HH:mm') } }], xAxes: [{ type: 'time', time: { unit: 'days', displayFormats: { days: 'MMMM DD, YYYY' } } }] } } });

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.3.0/moment.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script> <canvas id="myChart" height="90"></canvas>