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add custom chartjs tooltip
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@ -1,6 +1,6 @@
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import { Component, Input } from '@angular/core';
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import { Chart } from 'chart.js'
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import { LabelOptions } from '@angular/material/core';
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import { tooltip } from '../tooltip'
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@Component({
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selector: 'app-donut-chart',
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@ -71,6 +71,11 @@ export class DonutChartComponent {
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responsive: false,
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legend: {
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display: false
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},
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tooltips: {
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// Disable the on-canvas tooltip
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enabled: false,
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custom: tooltip(),
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}
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}
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});
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62
src/app/charts/tooltip.ts
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62
src/app/charts/tooltip.ts
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@ -0,0 +1,62 @@
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// Adapted from https://www.chartjs.org/samples/latest/tooltips/custom-pie.html
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export let tooltip: () => (tooltip: any) => void =
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function (): (tooltip: any) => void {
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return function (tooltip: any): void {
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// Tooltip Element
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const tooltipEl = document.getElementById('chartjs-tooltip');
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// Hide if no tooltip
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if (tooltip.opacity === 0) {
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tooltipEl.style.opacity = '0';
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return;
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}
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// Set caret Position
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tooltipEl.classList.remove('above', 'below', 'no-transform');
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if (tooltip.yAlign) {
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tooltipEl.classList.add(tooltip.yAlign);
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} else {
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tooltipEl.classList.add('no-transform');
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}
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function getBody(bodyItem) {
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return bodyItem.lines;
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}
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// Set Text
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if (tooltip.body) {
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let titleLines = tooltip.title || [];
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const bodyLines = tooltip.body.map(getBody);
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let innerHtml = '<thead>';
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titleLines.forEach(function (title) {
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innerHtml += '<tr><th>' + title + '</th></tr>';
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});
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innerHtml += '</thead><tbody>';
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bodyLines.forEach(function (body, i) {
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let colors = tooltip.labelColors[i];
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let style = 'background:' + colors.backgroundColor;
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style += '; border-color:' + colors.borderColor;
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style += '; border-width: 2px';
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let span = '<span class="chartjs-tooltip-key" style="' + style + '"></span>';
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innerHtml += '<tr><td>' + span + body + '</td></tr>';
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});
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innerHtml += '</tbody>';
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let tableRoot = tooltipEl.querySelector('table');
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tableRoot.innerHTML = innerHtml;
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}
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var position = this._chart.canvas.getBoundingClientRect();
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// Display, position, and set styles for font
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tooltipEl.style.opacity = '1';
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tooltipEl.style.position = 'absolute';
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tooltipEl.style.left = position.left + window.pageXOffset + tooltip.caretX + 'px';
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tooltipEl.style.top = position.top + window.pageYOffset + tooltip.caretY + 'px';
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tooltipEl.style.padding = tooltip.yPadding + 'px ' + tooltip.xPadding + 'px';
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tooltipEl.style.pointerEvents = 'none';
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}
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};
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@ -11,6 +11,9 @@
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</head>
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<body>
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<div id="chartjs-tooltip">
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<table></table>
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</div>
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<app-root></app-root>
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</body>
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@ -1,3 +1,27 @@
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// Chart.js styles
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#chartjs-tooltip {
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/* max z-index value */
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z-index: 2147483647;
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opacity: 0;
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position: absolute;
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background: rgba(0, 0, 0, .7);
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color: white;
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border-radius: 3px;
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-webkit-transition: opacity .3s ease;
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transition: opacity .3s ease;
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pointer-events: none;
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-webkit-transform: translate(-50%, 0);
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transform: translate(-50%, 0);
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}
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.chartjs-tooltip-key {
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display: inline-block;
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width: 10px;
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height: 10px;
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margin-right: 10px;
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}
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// Custom Theming for Angular Material
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// For more information: https://material.angular.io/guide/theming
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@import '~@angular/material/theming';
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