[Doc] Add i18n InputHelpterText section to Inputs/useInputs docs

docs/Inputs.md

@@ -774,6 +774,7 @@ const BoundedTextField = ({ name, label }: { name: string; label: string }) => {
         fieldState: { isTouched, invalid, error },
         formState: { isSubmitted }
     } = useController({ name, defaultValue: '' });
+
     return (
         <TextField
             {...field}
@@ -832,7 +833,7 @@ import { useInput, required, InputProps } from "react-admin";
 interface BoundedTextFieldProps
     extends Omit<
         TextFieldProps,
-        "label" | "helperText" | "onChange" | "onBlur" | "type" | "defaultValue"
+        "label" | "onChange" | "onBlur" | "type" | "defaultValue"
     >,
     InputProps {}
 
@@ -935,6 +936,51 @@ const { isDirty } = useFormState(); // ✅
 const formState = useFormState(); // ❌ should deconstruct the formState      
 ```
 
+## i18n
+
+In order to properly format the input's `helperText` and error messages from `useInput()`, custom inputs should make use of the react-admin component `<InputHelperText>`, which ensures that the text below the input returns consistently whether it's a string or a React component, and whether it's a simple message or an error. Importantly, react-admin messages from `useInput()` are passed through `useTranslate()` inside `<InputHelperText>`, which makes this component important for localization.
+
+```jsx
+import TextField from '@mui/material/TextField';
+import { useInput, InputHelperText } from 'react-admin';
+
+const BoundedTextField = (props: BoundedTextFieldProps) => {
+    const { onChange, onBlur, label, helperText, ...rest } = props;
+    const {
+        field,
+        fieldState: { isTouched, invalid, error },
+        formState: { isSubmitted },
+        isRequired,
+    } = useInput({
+        onChange,
+        onBlur,
+        ...rest,
+    });
+
+    const renderHelperText =
+        helperText !== false || ((isTouched || isSubmitted) && invalid);
+
+    return (
+        <TextField
+            {...field}
+            label={label}
+            error={(isTouched || isSubmitted) && invalid}
+            helperText={
+                renderHelperText ? (
+                    <InputHelperText
+                        touched={isTouched || isSubmitted}
+                        error={error?.message}
+                        helperText={helperText}
+                    />
+                ) : null
+            }
+            required={isRequired}
+            {...rest}
+        />
+    );
+};
+```
+
 ## Third-Party Components
 
 You can find components for react-admin in third-party repositories.

docs/useInput.md

@@ -62,7 +62,7 @@ import TextField from '@mui/material/TextField';
 import { useInput, required } from 'react-admin';
 
 const BoundedTextField = (props) => {
-    const { onChange, onBlur, ...rest } = props;
+    const { onChange, onBlur, label, ...rest } = props;
     const {
         field,
         fieldState: { isTouched, invalid, error },
@@ -73,13 +73,13 @@ const BoundedTextField = (props) => {
         // useInput will call the provided onChange and onBlur in addition to the default needed by react-hook-form.
         onChange,
         onBlur,
-        ...props,
+        ...rest,
     });
 
     return (
         <TextField
             {...field}
-            label={props.label}
+            label={label}
             error={(isTouched || isSubmitted) && invalid}
             helperText={(isTouched || isSubmitted) && invalid ? error : ''}
             required={isRequired}
@@ -99,14 +99,6 @@ const LatLngInput = props => {
     );
 };
 ```
-
-**Reminder:** [react-hook-form's `formState` is wrapped with a Proxy](https://react-hook-form.com/docs/useformstate/#rules) to improve render performance and skip extra computation if specific state is not subscribed. So, make sure you deconstruct or read the `formState` before render in order to enable the subscription.
-
-```js
-const { isDirty } = useFormState(); // ✅
-const formState = useFormState(); // ❌ should deconstruct the formState      
-```
-
 ## Usage with Material UI `<Select>`
 
 ```jsx
@@ -154,9 +146,22 @@ const PersonEdit = () => (
 );
 ```
 
-**Reminder:** [react-hook-form's `formState` is wrapped with a Proxy](https://react-hook-form.com/docs/useformstate/#rules) to improve render performance and skip extra computation if specific state is not subscribed. So, make sure you deconstruct or read the `formState` before render in order to enable the subscription.
+**Tip**: Remember to use react-admin's `<InputHelperText>` component in custom inputs to properly translate and render messages and errors coming from `useInput()`.
+
+## Important note about formState
+
+[react-hook-form's `formState` is wrapped with a Proxy](https://react-hook-form.com/docs/useformstate/#rules) to improve render performance and skip extra computation if specific state is not subscribed. So, make sure you deconstruct or read the `formState` before render in order to enable the subscription.
 
 ```js
 const { isDirty } = useFormState(); // ✅
 const formState = useFormState(); // ❌ should deconstruct the formState      
 ```
+
+This pattern should be followed when writing a custom input with `useInput()`.
+
+```jsx
+const { formState: { isSubmitted }} = useInput(props); // ✅
+
+const { formState } = useInput(props);
+const submitted = formState.isSubmitted; // ❌
+```