React Formik : how to use custom onChange and onBlur
Solution 1:
You'll need to remove the first handleBlur from Formik as blur event is only valid on the field level and do something like the following in your Field element:
<Field
component={MyInput}
name="email"
type="email"
onBlur={e => {
// call the built-in handleBur
handleBlur(e)
// and do something about e
let someValue = e.currentTarget.value
...
}}
/>
See https://github.com/jaredpalmer/formik/issues/157