BeforeDatasetsUpdateHook (Charba - J2CL and GWT charts library based on CHART.JS)

```
public interface BeforeDatasetsUpdateHook
```
Called before updating the 'chart' datasets.
If any plugin returns false, the datasets update is cancelled until another 'update' is triggered.

Author:

Andrea "Stock" Stocchero

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`onBeforeDatasetsUpdate(IsChart chart, PluginUpdateArgument argument)`	Called before updating the 'chart' datasets. If any plugin returns `false`, the datasets update is cancelled until another 'update' is triggered.

- Method Detail
  - onBeforeDatasetsUpdate
```
boolean onBeforeDatasetsUpdate(IsChart chart,
                               PluginUpdateArgument argument)
```
    Called before updating the 'chart' datasets.
    If any plugin returns false, the datasets update is cancelled until another 'update' is triggered.
    
    Parameters:
    
    chart - the chart instance.
    
    argument - the argument passed for update
    
    Returns:
    
    false to cancel the datasets update.