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add custom chartjs tooltip

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This commit is contained in:
Jesse Lucas 2020-03-27 15:49:35 -04:00
parent 3840d57f8d
commit 7aca2bcbc0
4 changed files with 95 additions and 1 deletions
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7
src/app/charts/donut-chart/donut-chart.component.ts
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@ -1,6 +1,6 @@
import { Component, Input } from '@angular/core';
import { Chart } from 'chart.js'
import { LabelOptions } from '@angular/material/core';
import { tooltip } from '../tooltip'
@Component({
selector: 'app-donut-chart',
@ -71,6 +71,11 @@ export class DonutChartComponent {
responsive: false,
legend: {
display: false
},
tooltips: {
// Disable the on-canvas tooltip
enabled: false,
custom: tooltip(),
}
}
});

62
src/app/charts/tooltip.ts Normal file
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@ -0,0 +1,62 @@
// Adapted from https://www.chartjs.org/samples/latest/tooltips/custom-pie.html
export let tooltip: () => (tooltip: any) => void =
function (): (tooltip: any) => void {
return function (tooltip: any): void {
// Tooltip Element
const tooltipEl = document.getElementById('chartjs-tooltip');
// Hide if no tooltip
if (tooltip.opacity === 0) {
tooltipEl.style.opacity = '0';
return;
}
// Set caret Position
tooltipEl.classList.remove('above', 'below', 'no-transform');
if (tooltip.yAlign) {
tooltipEl.classList.add(tooltip.yAlign);
} else {
tooltipEl.classList.add('no-transform');
}
function getBody(bodyItem) {
return bodyItem.lines;
}
// Set Text
if (tooltip.body) {
let titleLines = tooltip.title || [];
const bodyLines = tooltip.body.map(getBody);
let innerHtml = '<thead>';
titleLines.forEach(function (title) {
innerHtml += '<tr><th>' + title + '</th></tr>';
});
innerHtml += '</thead><tbody>';
bodyLines.forEach(function (body, i) {
let colors = tooltip.labelColors[i];
let style = 'background:' + colors.backgroundColor;
style += '; border-color:' + colors.borderColor;
style += '; border-width: 2px';
let span = '<span class="chartjs-tooltip-key" style="' + style + '"></span>';
innerHtml += '<tr><td>' + span + body + '</td></tr>';
});
innerHtml += '</tbody>';
let tableRoot = tooltipEl.querySelector('table');
tableRoot.innerHTML = innerHtml;
}
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 + window.pageXOffset + tooltip.caretX + 'px';
tooltipEl.style.top = position.top + window.pageYOffset + tooltip.caretY + 'px';
tooltipEl.style.padding = tooltip.yPadding + 'px ' + tooltip.xPadding + 'px';
tooltipEl.style.pointerEvents = 'none';
}
};

3
src/index.html
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@ -11,6 +11,9 @@
</head>
<body>
<div id="chartjs-tooltip">
<table></table>
</div>
<app-root></app-root>
</body>

24
src/styles.scss
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@ -1,3 +1,27 @@
// Chart.js styles
#chartjs-tooltip {
/* max z-index value */
z-index: 2147483647;
opacity: 0;
position: absolute;
background: rgba(0, 0, 0, .7);
color: white;
border-radius: 3px;
-webkit-transition: opacity .3s ease;
transition: opacity .3s ease;
pointer-events: none;
-webkit-transform: translate(-50%, 0);
transform: translate(-50%, 0);
}
.chartjs-tooltip-key {
display: inline-block;
width: 10px;
height: 10px;
margin-right: 10px;
}
// Custom Theming for Angular Material
// For more information: https://material.angular.io/guide/theming
@import '~@angular/material/theming';