Chartjs-ChartJs – Footer color dynamically

by

1👍

✅

I dont know where you get the instance part from since its not on the chart if I log it. But yes its possible, you can either do it globally (first outcommented line), you can do it for a specific chart at creation (second outcommented line) or for a specific chart after creation (last line)

//Chart.defaults.plugins.tooltip.footerColor =  (ctx) => (ctx.tooltip.dataPoints[0].parsed.y > 10 ? 'green' : 'red')

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: {
    plugins: {
      tooltip: {
        callbacks: {
          footer: () => ('fff')
        },
        //footerColor: (ctx) => (ctx.tooltip.dataPoints[0].parsed.y > 10 ? 'green' : 'red')
      }
    }
  }
}

var ctx = document.getElementById('chartJSContainer').getContext('2d');
const chart = new Chart(ctx, options);

chart.options.plugins.tooltip.footerColor = (ctx) => (ctx.tooltip.dataPoints[0].parsed.y > 10 ? 'green' : 'red');
chart.update();
<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