62 lines
2.5 KiB
TypeScript
62 lines
2.5 KiB
TypeScript
// 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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}; |