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Update api.md (#8701)

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Add clarification that you can pass type and quality options
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Jacco van den Berg 2021-03-23 13:27:07 +01:00 committed by GitHub
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docs/docs/developers/api.md
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@ -85,13 +85,16 @@ myLineChart.clear();
// => returns 'this' for chainability
```
## .toBase64Image()
## .toBase64Image(type?, quality?)
This returns a base 64 encoded string of the chart in its current state.
```javascript
myLineChart.toBase64Image();
// => returns png data url of the image on the canvas
myLineChart.toBase64Image('image/jpeg', 1)
// => returns a jpeg data url in the highest quality of the canvas
```
## .getElementsAtEventForMode(e, mode, options, useFinalPosition)