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Docs/clarify usage of ticks callback (#9991) #9994

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merged 2 commits into from Dec 16, 2021
Merged

Docs/clarify usage of ticks callback (#9991) #9994

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55be827
Docs/clarify usage of ticks callback (#9991)
Dec 15, 2021
1d42eb6
Docs/Fixed inconsistent variable names (#9991)
Dec 16, 2021
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9 changes: 8 additions & 1 deletion docs/axes/labelling.md
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Expand Up @@ -45,7 +45,7 @@ const chart = new Chart(ctx, {
y: {
ticks: {
// Include a dollar sign in the ticks
callback: function(value, index, values) {
callback: function(value, index, ticks) {
return '$' + value;
}
}
Expand All @@ -55,6 +55,13 @@ const chart = new Chart(ctx, {
});
```

Keep in mind that overriding `ticks.callback` means that you are responsible for all formatting of the label. Depending on your use case, you may want to call the default formatter and then modify its output. In the example above, that would look like:

```javascript
// call the default formatter, forwarding `this`
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It looks like there's some leading whitespace here which could be removed

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I kept the leading whitespace the same as in the example above, to emphasize that the snippet would substitute for return '$' + value;.

return '$' + Chart.Ticks.formatters.numeric.apply(this, [value, index, ticks]);
```

Related samples:

* [Tick configuration sample](../samples/scale-options/ticks)