score:11

Accepted answer

you cannot just pass the result array to data, as it isn't in correct format. data property expects an array of numbers. so, you need to parse the labels (using moment.js) and data from result array before using them for the chart.

here is how labels and data should be parsed from the result array and fed to the chart :

var result = [{ x: "18:00", y: "230" }, { x: "19:00", y: "232" }, { x: "20:00", y: "236" }, { x: "22:00", y: "228" }];

// parse labels and data
var labels = result.map(e => moment(e.x, 'hh:mm'));
var data = result.map(e => +e.y);

var ctx = document.getelementbyid("mychart").getcontext('2d');
var mychart = new chart(ctx, {
   type: 'line',
   data: {
      labels: labels,
      datasets: [{
         label: 'voltage fluctuation',
         data: data,
         borderwidth: 1
      }]
   },
   options: {
      scales: {
         xaxes: [{
            type: 'time',
            time: {
               unit: 'hour',
               displayformats: {
                  hour: 'hh:mm'
               }
            }
         }]
      },
   }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chart.js/2.6.0/chart.min.js"></script>
<canvas id="mychart"></canvas>


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