[Chartjs]-How to align vertical axis area on two charts in chart.js

by

1👍

Little late to the party, but it is possible to set a fixed width. I updated @LeeLenalee snippet with an example (both y axis have a 100px width in this case). This way, it is possible to align both graphs without any problem. Make sure to set a width that isn’t too small for the labels though!

var options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        borderWidth: 1
      },
      {
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        borderWidth: 1
      }
    ]
  },
  options: {
    scales: {
      yAxes: [{
          position: 'left',
          afterFit: (scaleInstance) => scaleInstance.width = 100,
        },
        {
          position: 'right',
          afterFit: (scaleInstance) => scaleInstance.width = 100,
          gridLines: {
            display: false
          },
          ticks: {
            callback: () => ''
          }
        }
      ]
    }
  }
}

var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js"></script>
</body>

0👍

I dont know how to or if it is even possible to define a width for a scale, but what you can do is add a second Y axis on the right with the grid dissabled and the callback returning a few spaces for spacing

var options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        borderWidth: 1
      },
      {
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        borderWidth: 1
      }
    ]
  },
  options: {
    scales: {
      yAxes: [{
          position: 'left'
        },
        {
          position: 'right',
          gridLines: {
            display: false
          },
          ticks: {
            callback: () => ('     ')
          }
        }
      ]
    }
  }
}

var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js"></script>
</body>

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