var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [72, 49, 43, 49, 35, 82],
pointBackgroundColor: ["red", "blue", "yellow", "green", "purple", "orange"]
}]
},
options: {
onClick: function(evt, activeElements) {
var elementIndex = activeElements[0]._index;
this.data.datasets[0].pointBackgroundColor[elementIndex] = 'white';
this.update();
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<canvas id="myChart" width="400" height="400"></canvas>