Fix react-admin requires custom routers to be data routers

docs/AccordionForm.md

@@ -351,7 +351,7 @@ export const TagEdit = () => (
 );
 ```
 
-**Warning**: This feature only works if you have a dependency on react-router 6.3.0 **at most**. The react-router team disabled this possibility in react-router 6.4, so `warnWhenUnsavedChanges` will silently fail with react-router 6.4 or later.
+**Note**: Due to limitations in react-router, this feature only works if you use the default router provided by react-admin, or if you use a Data Router.
 
 ## `sx`: CSS API
 

docs/EditTutorial.md

@@ -683,7 +683,7 @@ const Form = ({ onSubmit }) => {
 
 **Tip**: You can customize the message displayed in the confirm dialog by setting the `ra.message.unsaved_changes` message in your i18nProvider.
 
-**Warning**: This feature only works if you have a dependency on react-router 6.3.0 **at most**. The react-router team disabled this possibility in react-router 6.4, so `warnWhenUnsavedChanges` will silently fail with react-router 6.4 or later.
+**Note**: Due to limitations in react-router, this feature only works if you use the default router provided by react-admin, or if you use a Data Router.
 
 ## Submit On Enter
 

docs/Form.md

@@ -236,7 +236,7 @@ export const TagEdit = () => (
 );
 ```
 
-**Warning**: This feature only works if you have a dependency on react-router 6.3.0 **at most**. The react-router team disabled this possibility in react-router 6.4, so `warnWhenUnsavedChanges` will silently fail with react-router 6.4 or later.
+**Note**: Due to limitations in react-router, this feature only works if you use the default router provided by react-admin, or if you use a Data Router.
 
 ## Subscribing To Form Changes
 

docs/LongForm.md

@@ -349,7 +349,7 @@ export const TagEdit = () => (
 );
 ```
 
-**Warning**: This feature only works if you have a dependency on react-router 6.3.0 **at most**. The react-router team disabled this possibility in react-router 6.4, so `warnWhenUnsavedChanges` will silently fail with react-router 6.4 or later.
+**Note**: Due to limitations in react-router, this feature only works if you use the default router provided by react-admin, or if you use a Data Router.
 
 ## `<LongForm.Section>`
 

docs/SimpleForm.md

@@ -400,7 +400,7 @@ export const TagEdit = () => (
 );
 ```
 
-**Warning**: This feature only works if you have a dependency on react-router 6.3.0 **at most**. The react-router team disabled this possibility in react-router 6.4, so `warnWhenUnsavedChanges` will silently fail with react-router 6.4 or later.
+**Note**: Due to limitations in react-router, this feature only works if you use the default router provided by react-admin, or if you use a Data Router.
 
 ## Using Fields As Children
 

docs/TabbedForm.md

@@ -500,7 +500,7 @@ export const TagEdit = () => (
 );
 ```
 
-**Warning**: This feature only works if you have a dependency on react-router 6.3.0 **at most**. The react-router team disabled this possibility in react-router 6.4, so `warnWhenUnsavedChanges` will silently fail with react-router 6.4 or later.
+**Note**: Due to limitations in react-router, this feature only works if you use the default router provided by react-admin, or if you use a Data Router.
 
 ## `<TabbedForm.Tab>`
 

docs/Upgrade.md

@@ -613,11 +613,20 @@ import { FieldProps, useRecordContext } from 'react-admin';
 }
 ```
 
-## Custom Routers Must Be Upgraded To Data Routers
+## `warnWhenUnsavedChanges` Changes
 
-If you are using a [custom router](./Routing.md#using-a-custom-router), or if your React Admin app is embedded in another app with its own router, you will need to [migrate to a data router](https://reactrouter.com/en/main/upgrading/v6-data). This is because React Admin now uses `react-router`'s data router.
+The `warnWhenUnsavedChanges` feature is a little more restrictive than before:
 
-For instance, if you were using `react-router`'s `BrowserRouter`, you will need to migrate to `createBrowserRouter` and wrap your app in a `RouterProvider`:
+- It will open a confirmation dialog (and block the navigation) if a navigation is fired when the form is currently submitting (submission will continue in the background).
+- [Due to browser constraints](https://stackoverflow.com/questions/38879742/is-it-possible-to-display-a-custom-message-in-the-beforeunload-popup), the message displayed in the confirmation dialog when closing the browser's tab cannot be customized (it is managed by the browser).
+
+This behavior allows to prevent unwanted data loss in more situations. No changes are required in the code.
+
+The `warnWhenUnsavedChanges` requires a Data Router (a new type of router from react-router) to work. React-admin uses such a data router by default, so the feature works out of the box in v5. 
+
+However, if you use a [custom router](./Routing.md#using-a-custom-router) and the `warnWhenUnsavedChanges` prop, the "warn when unsaved change"s feature will be disabled.
+
+To re-enable it, you'll have to migrate your custom router to use the data router. For instance, if you were using `react-router`'s `BrowserRouter`, you will need to migrate to `createBrowserRouter` and wrap your app in a `RouterProvider`:
 
 ```diff
 import * as React from 'react';
@@ -652,15 +661,6 @@ root.render(
 
 **Tip:** Check out the [Migrating to RouterProvider](https://reactrouter.com/en/main/upgrading/v6-data) documentation to learn more about the migration steps and impacts.
 
-## `warnWhenUnsavedChanges` Is More Restrictive
-
-Due to the migration to `react-router`'s data router, you will notice that the `useWarnWhenUnsavedChanges` hook is a little more restrictive than before. Here are the main changes:
-
-- `useWarnWhenUnsavedChanges` will also open a confirmation dialog (and block the navigation) if a navigation is fired when the form is currently submitting (submission will continue in the background).
-- [Due to browser constraints](https://stackoverflow.com/questions/38879742/is-it-possible-to-display-a-custom-message-in-the-beforeunload-popup), the message displayed in the confirmation dialog when closing the browser's tab cannot be customized (it is managed by the browser).
-
-This behavior is a little more restrictive, but it allows to prevent unwanted data loss in most situations. No changes are required in the code.
-
 ## `<Admin history>` Prop Was Removed
 
 The `<Admin history>` prop was deprecated since version 4. It is no longer supported.

docs/WizardForm.md

@@ -404,7 +404,7 @@ export const TagEdit = () => (
 );
 ```
 
-**Warning**: This feature only works if you have a dependency on react-router 6.3.0 **at most**. The react-router team disabled this possibility in react-router 6.4, so `warnWhenUnsavedChanges` will silently fail with react-router 6.4 or later.
+**Note**: Due to limitations in react-router, this feature only works if you use the default router provided by react-admin, or if you use a Data Router.
 
 ## `<WizardForm.Step>`
 

packages/ra-core/src/form/Form.spec.tsx

@@ -18,6 +18,7 @@ import {
     ZodResolver,
     SanitizeEmptyValues,
     NullValue,
+    InNonDataRouter,
 } from './Form.stories';
 import { mergeTranslations } from '../i18n';
 
@@ -756,4 +757,15 @@ describe('Form', () => {
         expect(translate).not.toHaveBeenCalledWith('This field is required');
         mock.mockRestore();
     });
+
+    it('should work even inside a non-data router', async () => {
+        render(<InNonDataRouter />);
+        fireEvent.click(screen.getByText('Go to form'));
+        await screen.findByText('title');
+        fireEvent.change(screen.getByLabelText('title'), {
+            target: { value: '' },
+        });
+        fireEvent.click(screen.getByText('Leave the form'));
+        await screen.findByText('Go to form');
+    });
 });

packages/ra-core/src/form/Form.stories.tsx

@@ -8,6 +8,7 @@ import { zodResolver } from '@hookform/resolvers/zod';
 import * as z from 'zod';
 import polyglotI18nProvider from 'ra-i18n-polyglot';
 import englishMessages from 'ra-language-english';
+import { Route, Routes, useNavigate, Link, HashRouter } from 'react-router-dom';
 
 import { CoreAdminContext } from '../core';
 import { Form } from './Form';
@@ -290,3 +291,49 @@ export const ZodResolver = ({
         </CoreAdminContext>
     );
 };
+
+const FormUnderTest = () => {
+    const navigate = useNavigate();
+    return (
+        <>
+            <Form
+                record={{ title: 'lorem', body: 'ipsum' }}
+                onSubmit={() => setTimeout(() => navigate('/'), 0)}
+                warnWhenUnsavedChanges
+            >
+                <Input source="title" />
+                <Input source="body" />
+                <button type="submit">Submit</button>
+            </Form>
+            <Link to="/">Leave the form</Link>
+        </>
+    );
+};
+
+export const WarnWhenUnsavedChanges = ({
+    i18nProvider = defaultI18nProvider,
+}: {
+    i18nProvider?: I18nProvider;
+}) => (
+    <CoreAdminContext i18nProvider={i18nProvider}>
+        <Routes>
+            <Route path="/" element={<Link to="/form">Go to form</Link>} />
+            <Route path="/form" element={<FormUnderTest />} />
+        </Routes>
+    </CoreAdminContext>
+);
+
+export const InNonDataRouter = ({
+    i18nProvider = defaultI18nProvider,
+}: {
+    i18nProvider?: I18nProvider;
+}) => (
+    <HashRouter>
+        <CoreAdminContext i18nProvider={i18nProvider}>
+            <Routes>
+                <Route path="/" element={<Link to="/form">Go to form</Link>} />
+                <Route path="/form" element={<FormUnderTest />} />
+            </Routes>
+        </CoreAdminContext>
+    </HashRouter>
+);

packages/ra-core/src/form/Form.tsx

@@ -1,11 +1,15 @@
 import * as React from 'react';
-import { ReactNode } from 'react';
+import { ReactNode, useContext } from 'react';
 import {
     FormProvider,
     FieldValues,
     UseFormProps,
     SubmitHandler,
 } from 'react-hook-form';
+import {
+    UNSAFE_DataRouterContext,
+    UNSAFE_DataRouterStateContext,
+} from 'react-router';
 
 import { FormGroupsProvider } from './FormGroupsProvider';
 import { RaRecord } from '../types';
@@ -14,8 +18,13 @@ import {
     OptionalRecordContextProvider,
     SaveHandler,
 } from '../controller';
-import { SourceContextProvider, SourceContextValue, useResourceContext } from '../core';
+import {
+    SourceContextProvider,
+    SourceContextValue,
+    useResourceContext,
+} from '../core';
 import { ValidateForm } from './getSimpleValidationResolver';
+import { WarnWhenUnsavedChanges } from './WarnWhenUnsavedChanges';
 import { useAugmentedForm } from './useAugmentedForm';
 
 /**
@@ -45,17 +54,40 @@ import { useAugmentedForm } from './useAugmentedForm';
  *
  * @link https://react-hook-form.com/docs/useformcontext
  */
-// TODO: remove after upgrading prettier
-// eslint-disable-next-line prettier/prettier
-export const Form = <RecordType = any>(props: FormProps<RecordType>) => {
-    const { children, id, className, noValidate = false } = props;
+export function Form<RecordType = any>(props: FormProps<RecordType>) {
+    const {
+        children,
+        id,
+        className,
+        noValidate = false,
+        formRootPathname,
+        warnWhenUnsavedChanges,
+        WarnWhenUnsavedChangesComponent = WarnWhenUnsavedChanges,
+    } = props;
     const record = useRecordContext(props);
     const resource = useResourceContext(props);
     const { form, formHandleSubmit } = useAugmentedForm(props);
-    const sourceContext = React.useMemo<SourceContextValue>(() => ({
-        getSource: (source: string) => source,
-        getLabel: (source: string) => `resources.${resource}.fields.${source}`,
-    }), [resource]);
+    const sourceContext = React.useMemo<SourceContextValue>(
+        () => ({
+            getSource: (source: string) => source,
+            getLabel: (source: string) =>
+                `resources.${resource}.fields.${source}`,
+        }),
+        [resource]
+    );
+    const dataRouterContext = useContext(UNSAFE_DataRouterContext);
+    const dataRouterStateContext = useContext(UNSAFE_DataRouterStateContext);
+    if (
+        warnWhenUnsavedChanges &&
+        (!dataRouterContext || !dataRouterStateContext) &&
+        process.env.NODE_ENV === 'development'
+    ) {
+        console.error(
+            'Cannot use the warnWhenUnsavedChanges feature outside of a DataRouter. ' +
+                'The warnWhenUnsavedChanges feature is disabled. ' +
+                'Remove the warnWhenUnsavedChanges prop or convert your custom router to a Data Router.'
+        );
+    }
 
     return (
         <OptionalRecordContextProvider value={record}>
@@ -70,17 +102,31 @@ export const Form = <RecordType = any>(props: FormProps<RecordType>) => {
                         >
                             {children}
                         </form>
+                        {warnWhenUnsavedChanges &&
+                            dataRouterContext &&
+                            dataRouterStateContext && (
+                                <WarnWhenUnsavedChangesComponent
+                                    enable
+                                    formRootPathName={formRootPathname}
+                                    formControl={form.control}
+                                />
+                            )}
                     </FormGroupsProvider>
                 </FormProvider>
             </SourceContextProvider>
         </OptionalRecordContextProvider>
     );
-};
+}
 
 export type FormProps<RecordType = any> = FormOwnProps<RecordType> &
     Omit<UseFormProps, 'onSubmit'> & {
         validate?: ValidateForm;
         noValidate?: boolean;
+        WarnWhenUnsavedChangesComponent?: React.ComponentType<{
+            enable?: boolean;
+            formRootPathName?: string;
+            formControl?: any;
+        }>;
     };
 
 export interface FormOwnProps<RecordType = any> {

packages/ra-core/src/form/WarnWhenUnsavedChanges.ts

@@ -0,0 +1,10 @@
+import { useWarnWhenUnsavedChanges } from './useWarnWhenUnsavedChanges';
+
+export const WarnWhenUnsavedChanges = ({
+    enable = true,
+    formRootPathName,
+    formControl,
+}) => {
+    useWarnWhenUnsavedChanges(enable, formRootPathName, formControl);
+    return null;
+};

packages/ra-core/src/form/index.ts

@@ -47,3 +47,4 @@ export * from './useInput';
 export * from './useSuggestions';
 export * from './useUnique';
 export * from './useWarnWhenUnsavedChanges';
+export * from './WarnWhenUnsavedChanges';

packages/ra-core/src/form/useAugmentedForm.ts

@@ -16,7 +16,6 @@ import {
 } from './getSimpleValidationResolver';
 import { setSubmissionErrors } from './setSubmissionErrors';
 import { useNotifyIsFormInvalid } from './useNotifyIsFormInvalid';
-import { useWarnWhenUnsavedChanges } from './useWarnWhenUnsavedChanges';
 import { sanitizeEmptyValues as sanitizeValues } from './sanitizeEmptyValues';
 
 /**
@@ -41,7 +40,6 @@ export const useAugmentedForm = <RecordType = any>(
         reValidateMode = 'onChange',
         onSubmit,
         sanitizeEmptyValues,
-        warnWhenUnsavedChanges,
         validate,
         disableInvalidFormNotification,
         ...rest
@@ -83,13 +81,6 @@ export const useAugmentedForm = <RecordType = any>(
     // notify on invalid form
     useNotifyIsFormInvalid(form.control, !disableInvalidFormNotification);
 
-    // warn when unsaved change
-    useWarnWhenUnsavedChanges(
-        Boolean(warnWhenUnsavedChanges),
-        formRootPathname,
-        form.control
-    );
-
     // submit callbacks
     const handleSubmit = useCallback(
         async (values, event) => {
@@ -141,7 +132,6 @@ export interface UseFormOwnProps<RecordType = any> {
     formRootPathname?: string;
     record?: Partial<RaRecord>;
     onSubmit?: SubmitHandler<FieldValues> | SaveHandler<RecordType>;
-    warnWhenUnsavedChanges?: boolean;
     sanitizeEmptyValues?: boolean;
     disableInvalidFormNotification?: boolean;
 }