[Chartjs]-Adding custom title in tooltips of chart.js

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Use tooltipItem property index to reference the item in your tooltipsLabel array:

var tooltipsLabel = ['Dhaka', 'Rajshahi', 'NewYork', 'London']

var chartList = [5, 6, 7, 8];


function chart() {
  var ctx = document.getElementById("myChart").getContext('2d');
  var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
      labels: ["Red", "Blue", "green", "Yellow"],
      datasets: [{
        label: '# of Votes',
        data: chartList,
        backgroundColor: [
          'rgba(255, 99, 132, 0.2)',
          'rgba(54, 162, 235, 0.2)',
          'rgba(255, 99, 132, 0.2)',
          'rgba(54, 162, 235, 0.2)',
        ],
        borderColor: [
          'rgba(255,99,132,1)',
          'rgba(54, 162, 235, 1)',
          'rgba(255,99,132,1)',
          'rgba(54, 162, 235, 1)',
        ],
        borderWidth: 1
      }]
    },
    options: {
      scales: {
        yAxes: [{
          ticks: {
            beginAtZero: true
          }
        }]
      },
      tooltips: {
        mode: 'index',
        intersect: true,
        callbacks: {
          title: function(tooltipItem, data) {
            console.log(tooltipItem);
            return tooltipsLabel[tooltipItem[0].index];
          }
        }
      }
    }
  });

}

chart();
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.1/Chart.bundle.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<div class="row">
  <div class="col-lg-4">
    <canvas id="myChart" width="100" height="100"></canvas>
  </div>
  <div class="col-lg-4"><canvas id="pieChart" width="100" height="100"></canvas></div>
</div>

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