<ShowBase>

<ShowBase> is a headless component that lets you build custom Show pages. It handles the logic of the Show page:

• it calls useShowController to fetch the record from the data provider via dataProvider.getOne(),
• it computes the default page title
• it creates a ShowContext and a RecordContext,
• it renders its child component

Contrary to <Show>, it does not render the page layout, so no title, no actions, and no <Card>.

Usage

Use <ShowBase> instead of <Show> when you want a completely custom page layout, without the default actions and title.

// in src/posts.jsx
import * as React from "react";
import { ShowBase } from 'react-admin';

const PostShow = () => (
    <ShowBase resource="posts">
        <Grid container>
            <Grid item xs={8}>
                <SimpleShowLayout>
                    ...
                </SimpleShowLayout>
            </Grid>
            <Grid item xs={4}>
                Show instructions...
            </Grid>
        </Grid>
        <div>
            Post related links...
        </div>
    </ShowBase>
);

Components using <ShowBase> can be used as the show prop of a <Resource> component:

// in src/App.jsx
import { Admin, Resource } from 'react-admin';

import { dataProvider } from './dataProvider';
import { PostShow } from './posts';

const App = () => (
    <Admin dataProvider={dataProvider}>
        <Resource name="posts" show={PostShow} />
    </Admin>
);

Tip: See useShowController for a completely headless version of this component.

Props

children

<ShowBase> renders its children wrapped by a RecordContext, so you can use any component that depends on such a context to be defined - including all Field components.

For instance, to display several fields in a single line, you can use Material UI’s <Grid> component:

import { ShowBase, TextField, DateField, ReferenceField, WithRecord } from 'react-admin';
import { Grid } from '@mui/material';
import StarIcon from '@mui/icons-material/Star';

const BookShow = () => (
    <ShowBase emptyWhileLoading>
        <Grid container spacing={2} sx={{ margin: 2 }}>
            <Grid item xs={12} sm={6}>
                <TextField label="Title" source="title" />
            </Grid>
            <Grid item xs={12} sm={6}>
                <ReferenceField label="Author" source="author_id" reference="authors">
                    <TextField source="name" />
                </ReferenceField>
            </Grid>
            <Grid item xs={12} sm={6}>
                <DateField label="Publication Date" source="published_at" />
            </Grid>
            <Grid item xs={12} sm={6}>
                <WithRecord label="Rating" render={record => <>
                    {[...Array(record.rating)].map((_, index) => <StarIcon key={index} />)}
                </>} />
            </Grid>
        </Grid>
    </ShowBase>
);

disableAuthentication

By default, the <ShowBase> component will automatically redirect the user to the login page if the user is not authenticated. If you want to disable this behavior and allow anonymous access to a show page, set the disableAuthentication prop to true.

const PostShow = () => (
    <ShowBase disableAuthentication>
        ...
    </ShowBase>
);

emptyWhileLoading

By default, <ShowBase> renders its child component even before the dataProvider.getOne() call returns. If you use <SimpleShowLayout> or <TabbedShowLayout>, this isn’t a problem as these components only render when the record has been fetched. But if you use a custom child component that expects the record context to be defined, your component will throw an error.

The <ShowBase emptyWhileLoading> prop provides a convenient shortcut for that use case. When enabled, <ShowBase> won’t render its child until the record is loaded.

const BookShow = () => (
    <ShowBase emptyWhileLoading>
        ...
    </ShowBase>
);

id

By default, <ShowBase> deduces the identifier of the record to show from the URL path. So under the /posts/123/show path, the id prop will be 123. You may want to force a different identifier. In this case, pass a custom id prop.

export const PostShow = () => (
    <ShowBase id="123">
        ...
    </ShowBase>
);

Tip: Pass both a custom id and a custom resource prop to use <ShowBase> independently of the current URL. This even allows you to use more than one <ShowBase> component in the same page.

queryOptions

<ShowBase> accepts a queryOptions prop to pass options to the react-query client.

This can be useful e.g. to override the default error side effect. By default, when the dataProvider.getOne() call fails at the dataProvider level, react-admin shows an error notification and refreshes the page.

You can override this behavior and pass custom side effects by providing a custom queryOptions prop:

import * as React from 'react';
import { useNotify, useRefresh, useRedirect, ShowBase, SimpleShowLayout } from 'react-admin';

const PostShow = () => {
    const notify = useNotify();
    const refresh = useRefresh();
    const redirect = useRedirect();

    const onError = (error) => {
        notify(`Could not load post: ${error.message}`, { type: 'error' });
        redirect('/posts');
        refresh();
    };

    return (
        <ShowBase queryOptions=>
            <SimpleShowLayout>
                ...
            </SimpleShowLayout>
        </ShowBase>
    );
}

The onError function receives the error from the dataProvider call (dataProvider.getOne()), which is a JavaScript Error object (see the dataProvider documentation for details).

The default onError function is:

(error) => {
    notify('ra.notification.item_doesnt_exist', { type: 'error' });
    redirect('list', resource);
    refresh();
}

resource

By default, <ShowBase> operates on the current ResourceContext (defined at the routing level), so under the /posts/1/show path, the resource prop will be posts. You may want to force a different resource. In this case, pass a custom resource prop, and it will override the ResourceContext value.

export const UsersShow = () => (
    <ShowBase resource="users">
        ...
    </ShowBase>
);

Tip: Pass both a custom id and a custom resource prop to use <ShowBase> independently of the current URL. This even allows you to use more than one <ShowBase> component in the same page.