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Update tooltip docs with working example (#6918)

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Evert Timberg 2020-01-06 17:49:36 -05:00 committed by GitHub
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docs/configuration/tooltip.md
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@ -121,7 +121,7 @@ All functions are called with the same arguments: a [tooltip item](#tooltip-item
### Label Callback
The `label` callback can change the text that displays for a given data point. A common example to round data values; the following example rounds the data to two decimal places.
The `label` callback can change the text that displays for a given data point. A common example to show a unit. The example below puts a `'$'` before every row.
```javascript
var chart = new Chart(ctx, {
@ -136,7 +136,9 @@ var chart = new Chart(ctx, {
if (label) {
label += ': ';
}
label += Math.round(tooltipItem.value * 100) / 100;
if (!helpers.isNullOrUndef(tooltipItem.value)) {
label += '$' + tooltipItem.value;
}
return label;
}
}