Define a function that can transform a value being read from a field.
Please note - this property requires the Editor extension for DataTables.
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This option provides the ability to modify the data the end user inputs in an
input element (or any other field type) transforming it into any other format before being used by the API or form submission. This can be useful for cases where you want the end user to not see the original data format.
Consider for example editing an ISO8601 date string - it isn't the friendliest format to show to your end users, so you might use
fields.setFormatter to convert it to a more readable format (in combination with the
format option to tell it what the format is) and then this option to convert it back to ISO8601 for the rest of your program. This use case is shown in the example below.