Hi Agweb,
As always, there are a few ways to do it, this is just one:
Add a Custom Property of type Dataset to the root container. Call it GrowingDays, and bind it to your GrowingDays tag:
On the root container, add a propertyChange script:
Now, every time the GrowingDays tag changes, it will update the data on the chart with the reformatted dataset!
With your second error, it sounds like you the column ‘GDD’ is of type ‘String’ and you need to convert it to type ‘integer’, I’ve added this to the script above.
Note: It would be better to make sure your data types are correct when your original dataset is created. This is really just a work around so it will work with the chart.