Formik: field-level value parsing/onChange

[timoxley]

I'd like to be able to transform values as they are changed, e.g. coerce text field into a number. Seems the only option to do this with formik is to do all the value formatting in the form's onSubmit. Would be good if there were a way to inject a mapping function that's called each time an input value changes.

[prichodko]

You can pass your own onChange handler, do what you need and programmatically call setFieldValue provided from Formik.

[timoxley]

@prichodko this is a reasonable workaround.