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73 lines
1.5 KiB
Markdown
73 lines
1.5 KiB
Markdown
# Custom Tooltip Content
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This sample shows how to use the tooltip callbacks to add additional content to the tooltip.
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```js chart-editor
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// <block:footer:2>
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const footer = (tooltipItems) => {
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let sum = 0;
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tooltipItems.forEach(function(tooltipItem) {
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sum += tooltipItem.parsed.y;
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});
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return 'Sum: ' + sum;
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};
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// </block:footer>
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// <block:setup:1>
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const DATA_COUNT = 7;
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const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100, decimals: 0};
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const data = {
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labels: Utils.months({count: DATA_COUNT}),
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datasets: [
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{
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label: 'Dataset 1',
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data: Utils.numbers(NUMBER_CFG),
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fill: false,
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borderColor: Utils.CHART_COLORS.red,
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backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red, 0.5),
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},
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{
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label: 'Dataset 2',
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data: Utils.numbers(NUMBER_CFG),
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fill: false,
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borderColor: Utils.CHART_COLORS.blue,
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backgroundColor: Utils.transparentize(Utils.CHART_COLORS.blue, 0.5),
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},
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]
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};
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// </block:setup>
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// <block:config:0>
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const config = {
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type: 'line',
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data: data,
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options: {
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interaction: {
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intersect: false,
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mode: 'index',
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},
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plugins: {
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tooltip: {
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callbacks: {
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footer: footer,
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}
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}
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}
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}
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};
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// </block:config>
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module.exports = {
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actions: [],
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config: config,
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};
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```
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## Docs
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* [Data structures (`labels`)](../../general/data-structures.html)
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* [Line](../../charts/line.html)
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* [Tooltip](../../configuration/tooltip.html)
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* [Tooltip Callbacks](../../configuration/tooltip.html#tooltip-callbacks)
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