[Chartjs]-Custom filter charts in chart.js

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You can use the native onClick event handler method of the legend.

So.. in your chart options, define the following :

options: {
   legend: {
      onClick: newLegendClickHandler
   },
   ...
}

this will override the default on-click event handler function of the legend.

ᴅᴇᴍᴏ

var chart = new Chart(ctx, {
   type: 'line',
   data: {
      labels: ['Jan', 'Feb', 'Mar'],
      datasets: [{
         label: 'LINE',
         data: [3, 1, 4],
         backgroundColor: 'rgba(0, 119, 290, 0.2)',
         borderColor: 'rgba(0, 119, 290, 0.6)'
      }]
   },
   options: {
      legend: {
         onClick: newLegendClickHandler
      }
   }
});

function newLegendClickHandler() {
   alert('newLegendClickHandler function has been called!');
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="ctx"></canvas>

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