[Chartjs]-Customizing Chart.js tool tips

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You can use Callbacks as it is mentioned in Chart.js Documentatoin

You can even customize your tooltips for example:

var myPieChart = new Chart(ctx, {
    type: 'pie',
    data: data,
    options: {
        tooltips: {
            // Disable the on-canvas tooltip
            enabled: false,

            custom: function(tooltipModel) {
                // Tooltip Element
                var tooltipEl = document.getElementById('chartjs-tooltip');

                // Create element on first render
                if (!tooltipEl) {
                    tooltipEl = document.createElement('div');
                    tooltipEl.id = 'chartjs-tooltip';
                    tooltipEl.innerHTML = "<table></table>";
                    document.body.appendChild(tooltipEl);
                }

                // Hide if no tooltip
                if (tooltipModel.opacity === 0) {
                    tooltipEl.style.opacity = 0;
                    return;
                }

                // Set caret Position
                tooltipEl.classList.remove('above', 'below', 'no-transform');
                if (tooltipModel.yAlign) {
                    tooltipEl.classList.add(tooltipModel.yAlign);
                } else {
                    tooltipEl.classList.add('no-transform');
                }

                function getBody(bodyItem) {
                    return bodyItem.lines;
                }

                // Set Text
                if (tooltipModel.body) {
                    var titleLines = tooltipModel.title || [];
                    var bodyLines = tooltipModel.body.map(getBody);

                    var innerHtml = '<thead>';

                    titleLines.forEach(function(title) {
                        innerHtml += '<tr><th>' + title + '</th></tr>';
                    });
                    innerHtml += '</thead><tbody>';

                    bodyLines.forEach(function(body, i) {
                        var colors = tooltipModel.labelColors[i];
                        var style = 'background:' + colors.backgroundColor;
                        style += '; border-color:' + colors.borderColor;
                        style += '; border-width: 2px';
                        var span = '<span style="' + style + '"></span>';
                        innerHtml += '<tr><td>' + span + body + '</td></tr>';
                    });
                    innerHtml += '</tbody>';

                    var tableRoot = tooltipEl.querySelector('table');
                    tableRoot.innerHTML = innerHtml;
                }

                // `this` will be the overall tooltip
                var position = this._chart.canvas.getBoundingClientRect();

                // Display, position, and set styles for font
                tooltipEl.style.opacity = 1;
                tooltipEl.style.position = 'absolute';
                tooltipEl.style.left = position.left + tooltipModel.caretX + 'px';
                tooltipEl.style.top = position.top + tooltipModel.caretY + 'px';
                tooltipEl.style.fontFamily = tooltipModel._bodyFontFamily;
                tooltipEl.style.fontSize = tooltipModel.bodyFontSize + 'px';
                tooltipEl.style.fontStyle = tooltipModel._bodyFontStyle;
                tooltipEl.style.padding = tooltipModel.yPadding + 'px ' + tooltipModel.xPadding + 'px';
            }
        }
    }
});

See the Samples
and more

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