[Chartjs]-How to append more data in tooltip of graph in chart.js

by

4👍

✅

You can achieve this using afterBody callback function of tooltips …

options: {
   tooltips: {
      callbacks: {
         afterBody: function(t, d) {
            return 'loss 15%';  // return a string that you wish to append
         }
      }
   },
   ...
}

Here is a working example …

var ctx = document.getElementById("myChart").getContext('2d');

var myChart = new Chart(ctx, {
   type: 'line',
   data: {
      labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun'],
      datasets: [{
         label: 'Standard Rating',
         data: [1, 2, 3, 4, 5, 6],
         backgroundColor: 'rgba(209, 230, 245, 0.5)',
         borderColor: 'rgba(56, 163, 236, 1)',
         borderWidth: 1
      }]
   },
   options: {
      responsive: false,
      tooltips: {
         callbacks: {
            afterBody: function(t, d) {
               return 'loss 15%'; //return a string that you wish to append
            }
         }
      },
      scales: {
         yAxes: [{
            ticks: {
               beginAtZero: true
            }
         }]
      }
   }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<canvas id="myChart" width="350" height="200"></canvas>

0👍

Adding onto this in case anyone missed the comment, if you want to return a string and a variable use return "string" + varName

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