Change Chart.js tooltip caret position

Question

I created a doughnut chart using Chart.js 2.5. The issue I’m having is with the tooltip. When I hover over the chart, a tooltip is displayed with a caret that always stays in the left or right side, like this:

I want to change the caret position so that it always show in the bottom. Is that possible?

Here is my chart code

var myChart = new Chart(ctx, {
    type: 'doughnut',
    data: {
        labels: ['Jan', 'Feb', 'Mar'],
        datasets: [{
            label: 'dataset',
            data: [30, 50, 20],
            backgroundColor: [
            'rgb(153, 102, 255)',
            'rgb(255, 205, 86)',
            'rgb(54, 162, 235)'
            ],
        }],
    }
})

Answer 1

You could set yAlign property to bottom for tooltips in your chart options to display tooltip's caret always at the bottom position ...

options: {
    tooltips: {
        yAlign: 'bottom'
    }
}

ᴅᴇᴍᴏ

var ctx = document.getElementById("chart").getContext("2d");
var myChart = new Chart(ctx, {
    type: 'doughnut',
    data: {
        labels: ['Jan', 'Feb', 'Mar'],
        datasets: [{
            label: 'dataset',
            data: [30, 50, 20],
            backgroundColor: ['rgb(153, 102, 255)', 'rgb(255, 205, 86)', 'rgb(54, 162, 235)']
        }]
    },
    options: {
        responsive: false,
        tooltips: {
            yAlign: 'bottom'
        }
    }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<canvas id="chart" height="180"></canvas>