I have two Autocomplete fields, my goal is to change the value of the second field by the value of the first field.
The problem I face is when my trying to send the new value to the "setValue" function nothing happens the state form changing, but the autocomplete field shows the old value. In this sand box: https://codesandbox.io/s/dazzling-carson-84dxp?file=/src/Form/Components/UserCountry.js
you can see my implementation.
If you look at console when you change user_name field, you can see materialUI warning in the console which says:
Material-UI: A component is changing the uncontrolled value state of Autocomplete to be controlled.
it's reason is that your user_country's value by default is undefined and material consider this field as uncontrolled field, it means material will take the control of user_country value. To solve the problem you have two solutions:
1- Defining your form by defaultValues options like this:
const methods = useForm({
defaultValues: {
user_name: null,
user_country: null
}
});
2- Sending null as value to AutoComplete when it doesn't have any value, like this:
<Controller
control={control}
name={`user_country`}
render={({ field: { onChange, value } }) => (
<Autocomplete
id="country-select-demo"
options={countries}
onChange={(event, item) => {
onChange(item);
}}
value={value || null}
...
/>
)}
/>
Here You can see your form which updates user_country whenever you change user_name field.