Adds an event handler that runs when a signature input element's value is changed by a site visitor.
A signature input element receives a change
event when a site visitor changes its value.
A change
event is not triggered when:
clear()
function.
handler(event: Event): void
The name of the function to run when the signature input element's value changes.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.