- s
- Documentation for this section has not yet been entered.
- start
- Documentation for this section has not yet been entered.
- count
- Documentation for this section has not yet been entered.
- after
- Documentation for this section has not yet been entered.
This method is called to notify you that, within s, the count characters beginning at start are about to be replaced by new text with length after. It is an error to attempt to make changes to s from this callback.