[Chartjs]-Chart.js updating data

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You should be updating the chart data as follows :

setTimeout(function() {
   addData(myChart, [45, 50, 30, 34, 61, 53, 42], 0);
}, 2000);

function addData(chart, data, datasetIndex) {
   chart.data.datasets[datasetIndex].data = data;
   chart.update();
}

Working Example

var gradientStroke = 'rgba(0, 119, 220, 0.6)',
    gradientFill = 'rgba(0, 119, 220, 0.4)';

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

var myChart = new Chart(ctx, {
   type: 'line',
   data: {
      labels: ["JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL"],
      datasets: [{
         label: "Data",
         borderColor: gradientStroke,
         pointBorderColor: gradientStroke,
         pointBackgroundColor: gradientStroke,
         pointHoverBackgroundColor: gradientStroke,
         pointHoverBorderColor: gradientStroke,
         pointBorderWidth: 5,
         pointHoverRadius: 5,
         pointHoverBorderWidth: 1,
         pointRadius: 3,
         fill: true,
         backgroundColor: gradientFill,
         borderWidth: 2,
         data: [50, 80, 130, 65, 100, 66, 86],
      }]
   },
   options: {
      responsive: false,
      legend: {
         position: "top"
      },
      scales: {
         yAxes: [{
            ticks: {
               fontColor: "rgba(255,255,255,0.5)",
               fontStyle: "bold",
               beginAtZero: true,
               maxTicksLimit: 5,
               padding: 20
            },
            gridLines: {
               drawTicks: false,
               display: false
            }

         }],
         xAxes: [{
            gridLines: {
               zeroLineColor: "rgba(255,255,255,0.5)"
            },
            ticks: {
               padding: 20,
               fontColor: "rgba(255,255,255,0.5)",
               fontStyle: "bold"
            }
         }]
      }
   }
});


setTimeout(function() {
   addData(myChart, [45, 50, 30, 34, 61, 53, 42], 0);
}, 2000);

function addData(chart, data, datasetIndex) {
   chart.data.datasets[datasetIndex].data = data;
   chart.update();
}
* { background: #111 }
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="chart" width="350" height="200"></canvas>

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