score:30

Accepted answer

Dev 2.0 of chart js supports an option to reverse the ticks when setting up the axis so your declaration of the second axis would become

{
    type: "invertedLinear", // only linear but allow scale type registration. This allows extensions to exist solely for log scale for instance
    display: true,
    position: "right",
    id: "y-axis-2",
    ticks: {
        reverse: true
    },
    // grid line settings
    gridLines: {
        drawOnChartArea: false, // only want the grid lines for one axis to show up
    }
}

Here it is in action https://jsfiddle.net/nwc8ys34/15/

score:1

In v3 the scale configs have been changed so the desired behaviour can be accomplished like so:

const options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [40, 80, 100, 70, 60, 80],
        borderColor: 'pink'
      },
      {
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        borderColor: 'orange',
        yAxisID: 'y2'
      }
    ]
  },
  options: {
    scales: {
      y: {},
      y2: {
        position: 'right',
        reverse: true
      }
    }
  }
}

const ctx = document.getElementById('chartJSContainer').getContext('2d');
const chart = new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.6.0/chart.js"></script>
</body>

score:23

Using v 2.7.0, and the following seems to work:

options: {
  scales: {
    yAxes: [{
      ticks: {
        reverse: true,
      }
    }]
  }
}

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