score:1

Accepted answer

yLabel and xLabel dont exist anymore on the tooltip, they are V2 syntax. You can just axess the y object in the parsed section to get the y value. Then you can use the afterBody callback to show the x label like so:

const options = {
  type: 'line',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
      label: '# of Votes',
      data: [12, 19, 3, 5, 2, 3],
      borderColor: 'pink'
    }]
  },
  options: {
    plugins: {
      tooltip: {
        displayColors: false,
        backgroundColor: 'rgba(45,132,180,0.8)',
        bodyFontColor: 'rgb(255,255,255)',
        callbacks: {
          title: () => {
            return
          },
          label: (ttItem) => (`${ttItem.parsed.y} ppm`),
          afterBody: (ttItems) => (ttItems[0].label)
        }
      }
    }
  }
}

const 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/3.7.0/chart.js"></script>
</body>


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