Fix: Improve AutocompleteInput creation support

packages/ra-ui-materialui/src/input/AutocompleteArrayInput.spec.tsx

@@ -18,6 +18,7 @@ import {
     InsideReferenceArrayInput,
     InsideReferenceArrayInputOnChange,
     OnChange,
+    OnCreate,
 } from './AutocompleteArrayInput.stories';
 
 describe('<AutocompleteArrayInput />', () => {
@@ -812,6 +813,26 @@ describe('<AutocompleteArrayInput />', () => {
         expect(screen.queryByText('New Kid On The Block')).not.toBeNull();
     });
 
+    it('should allow the creation of a new choice by pressing enter', async () => {
+        render(<OnCreate />);
+        const input = (await screen.findByLabelText(
+            'Roles'
+        )) as HTMLInputElement;
+        // Enter an unknown value and submit it with Enter
+        await userEvent.type(input, 'New Value{Enter}');
+        // AutocompleteArrayInput does not have an input with all values.
+        // Instead it adds buttons for each values.
+        await screen.findByText('New Value', { selector: '[role=button] *' });
+        // Clear the input, otherwise the new value won't be shown in the dropdown as it is selected
+        fireEvent.change(input, {
+            target: { value: '' },
+        });
+        // Open the dropdown
+        fireEvent.mouseDown(input);
+        // Check the new value is in the dropdown
+        await screen.findByText('New Value');
+    });
+
     it('should support creation of a new choice through the create element', async () => {
         const choices = [
             { id: 'ang', name: 'Angular' },

packages/ra-ui-materialui/src/input/AutocompleteArrayInput.stories.tsx

@@ -6,6 +6,7 @@ import {
     useCreate,
     useRecordContext,
     TestMemoryRouter,
+    testDataProvider,
 } from 'ra-core';
 import polyglotI18nProvider from 'ra-i18n-polyglot';
 import englishMessages from 'ra-language-english';
@@ -182,6 +183,98 @@ const CreateRole = () => {
     );
 };
 
+const OnCreateInput = () => {
+    const [choices, setChoices] = React.useState<
+        { id: string; name: string }[]
+    >([
+        { id: 'admin', name: 'Admin' },
+        { id: 'u001', name: 'Editor' },
+        { id: 'u002', name: 'Moderator' },
+        { id: 'u003', name: 'Reviewer' },
+    ]);
+    return (
+        <AutocompleteArrayInput
+            source="roles"
+            choices={choices}
+            onCreate={async filter => {
+                if (!filter) return;
+
+                const newOption = {
+                    id: filter,
+                    name: filter,
+                };
+                setChoices(options => [...options, newOption]);
+                // Wait until next tick to give some time for React to update the state
+                await new Promise(resolve => setTimeout(resolve));
+                return newOption;
+            }}
+            TextFieldProps={{
+                placeholder: 'Start typing to create a new item',
+            }}
+        />
+    );
+};
+
+export const OnCreate = () => (
+    <Wrapper>
+        <OnCreateInput />
+    </Wrapper>
+);
+
+const OnCreateInputStringChoices = () => {
+    const [choices, setChoices] = React.useState<string[]>([
+        'Admin',
+        'Editor',
+        'Moderator',
+        'Reviewer',
+    ]);
+    return (
+        <AutocompleteArrayInput
+            source="roles"
+            choices={choices}
+            onCreate={async filter => {
+                if (!filter) return;
+
+                const newOption = {
+                    id: filter,
+                    name: filter,
+                };
+                setChoices(options => [...options, filter]);
+                // Wait until next tick to give some time for React to update the state
+                await new Promise(resolve => setTimeout(resolve));
+                return newOption;
+            }}
+            TextFieldProps={{
+                placeholder: 'Start typing to create a new item',
+            }}
+        />
+    );
+};
+
+export const OnCreateStringChoices = () => (
+    <AdminContext
+        dataProvider={testDataProvider({
+            // @ts-expect-error
+            create: async (resource, params) => {
+                console.log(resource, params);
+                return params;
+            },
+        })}
+        i18nProvider={i18nProvider}
+        defaultTheme="light"
+    >
+        <Create
+            resource="posts"
+            record={{ roles: ['Editor', 'Moderator'] }}
+            sx={{ width: 600 }}
+        >
+            <SimpleForm>
+                <OnCreateInputStringChoices />
+            </SimpleForm>
+        </Create>
+    </AdminContext>
+);
+
 export const CreateProp = () => (
     <Wrapper>
         <AutocompleteArrayInput

packages/ra-ui-materialui/src/input/AutocompleteInput.spec.tsx

@@ -1338,6 +1338,23 @@ describe('<AutocompleteInput />', () => {
             fireEvent.focus(input);
             expect(screen.queryByText('New Kid On The Block')).not.toBeNull();
         });
+        it('should allow the creation of a new choice by pressing enter', async () => {
+            render(<OnCreate />);
+            const input = (await screen.findByLabelText(
+                'Author'
+            )) as HTMLInputElement;
+            // Enter an unknown value and submit it with Enter
+            await userEvent.type(input, 'New Value{Enter}');
+            await screen.getByDisplayValue('New Value');
+            // Clear the input, otherwise the new value won't be shown in the dropdown as it is selected
+            fireEvent.change(input, {
+                target: { value: '' },
+            });
+            // Open the dropdown
+            fireEvent.mouseDown(input);
+            // Check the new value is in the dropdown
+            await screen.findByText('New Value');
+        });
         it('should allow the creation of a new choice with a promise', async () => {
             const choices = [
                 { id: 'ang', name: 'Angular' },

packages/ra-ui-materialui/src/input/AutocompleteInput.tsx

@@ -14,6 +14,7 @@ import isEqual from 'lodash/isEqual';
 import clsx from 'clsx';
 import {
     Autocomplete,
+    AutocompleteChangeReason,
     AutocompleteProps,
     Chip,
     TextField,
@@ -552,12 +553,19 @@ If you provided a React element for the optionText prop, you must also provide t
     };
 
     const handleAutocompleteChange = useCallback(
-        (event: any, newValue: any, _reason: string) => {
+        (event: any, newValue: any, reason: AutocompleteChangeReason) => {
+            // This prevents auto-submitting a form inside a dialog passed to the `create` prop
+            event.preventDefault();
+            if (reason === 'createOption') {
+                // When users press the enter key after typing a new value, we can handle it as if they clicked on the create option
+                handleChangeWithCreateSupport(getCreateItem(newValue));
+                return;
+            }
             handleChangeWithCreateSupport(
                 newValue != null ? newValue : emptyValue
             );
         },
-        [emptyValue, handleChangeWithCreateSupport]
+        [emptyValue, getCreateItem, handleChangeWithCreateSupport]
     );
 
     const oneSecondHasPassed = useTimeout(1000, filterValue);