set field value formik code example
Example: setFieldValue
const Form = ({ data }) => (
<Formik
initialValues={data}
...and do some more stuff here like error handling submit handling etc...
render={({ values, handleSubmit, handleChange, handleBlur }) => (
<Form onSubmit={handleSubmit}>
<Field
name="mail.email"
value={values.mail.mail}
render={({ field, form }) => (
<input
{...field}
onChange={e => {
const domain = e.target.value.replace(/.*@/, '')
handleChange(e)
form.setFieldValue('mail.domain', domain)
}}
/>
)}
/>
<input
name="mail.domain"
value={values.mail.domain}
onChange={handleChange}
onBlur={handleBlur}
/>
<button type="submit">Submit</button>
</Form>
)}
/>
)