Chartjs-React-Chart.js legend onClick function

by

1👍

You can set all datasets to hide and then only the one clicked to show:

var options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        borderColor: 'pink',
        hidden: true
      },
      {
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        borderColor: 'orange',
        hidden: true
      },
      {
        label: '# of People',
        data: [3, 1, 15, 4, 9, 12],
        borderColor: 'cyan',
        hidden: true
      }
    ]
  },
  options: {
    plugins: {
      legend: {
        onClick: (evt, legendItem, legend) => {
          const index = legendItem.datasetIndex;
          const ci = legend.chart;

          legend.chart.data.datasets.forEach((d, i) => {
            ci.hide(i);
            d.hidden = true;
          })

          ci.show(index);
          legendItem.hidden = false;

          ci.update();
        }
      }
    }
  }
}

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/3.5.1/chart.js"></script>
</body>

Leave a comment