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useTranslation

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Demos

Import

import { Form } from '@dnb/eufemia/extensions/forms'
// Use Form.useTranslation

Description

The Form.useTranslation is a hook that returns the translations for the current locale.

import { Form } from '@dnb/eufemia/extensions/forms'


function MyComponent() {
  const { Field } = Form.useTranslation()
  const { errorRequired } = Field


  return <>MyComponent</>
}


render(
  <Form.Handler locale="en-GB">
    <MyComponent />
  </Form.Handler>,
)

Additional utilities

In addition to all internal translations, you also get;

  • formatMessage - a function you can use to get a specific translation based on a key (flattened object with dot-notation).
  • renderMessage - a function you can use to render a string with line-breaks. It converts {br} to a JSX line-break.
import { Form } from '@dnb/eufemia/extensions/forms'


function MyComponent() {
  const { formatMessage, renderMessage } = Form.useTranslation()
  const errorRequired = formatMessage('Field.errorRequired')


  return <>MyComponent</>
}


render(
  <Form.Handler locale="en-GB">
    <MyComponent />
  </Form.Handler>,
)

Custom translations

You can also extend the translations with your own custom translations.

import { Form } from '@dnb/eufemia/extensions/forms'


const myTranslations = {
  'nb-NO': { myString: 'Min egendefinerte streng' },
  'en-GB': {
    // Cascaded translations
    Nested: {
      stringWithArgs: 'My custom string with an argument: {myKey}',
    },


    // Flat translations
    'Nested.stringWithLinebreaks':
      'My custom string with a {br}line-break',
  },
}


const MyComponent = () => {
  const t = Form.useTranslation<typeof myTranslations>()


  // Internal translations
  const existingString = t.Field.errorRequired


  // Your translations
  const myString = t.myString


  // Use the "formatMessage" function to handle strings with arguments
  const myStringWithArgsA = t.formatMessage(t.Nested.stringWithArgs, {
    myKey: 'myValue',
  })
  // You can also get the string with a key (dot-notation)
  const myStringWithArgsB = t.formatMessage('Nested.stringWithArgs', {
    myKey: 'myValue',
  })


  // Render line-breaks
  const jsxOutput = t.renderMessage(t.Nested.stringWithLinebreaks)


  return <>MyComponent</>
}


render(
  <Form.Handler translations={myTranslations}>
    <MyComponent />
  </Form.Handler>,
)

Using the <Translation />

Instead of using the hook, you can also, use the <Translation /> component to consume your translations:

import { Form } from '@dnb/eufemia/extensions/forms'
import { Translation, TranslationProps } from '@dnb/eufemia/shared'


const myTranslations = {
  'nb-NO': { 'custom.string': 'Min egendefinerte streng' },
  'en-GB': { 'custom.string': 'My custom string' },
}
type TranslationType = (typeof myTranslations)[keyof typeof myTranslations]


render(
  <Form.Handler translations={myTranslations}>
    <Form.MainHeading>
      <Translation<TranslationType> id="custom.string" />
    </Form.MainHeading>


    <Form.SubHeading>
      <Translation<TranslationType> id={(t) => t.custom.string} />
    </Form.SubHeading>
  </Form.Handler>,
)

Formatting markers inside <Translation />

<Translation /> automatically applies simple formatting markers in strings (using the shared renderWithFormatting):

  • {br} inserts a line break
  • **bold**, _italic_, `code`
  • links [label](https://…) and bare URLs https://…
import { Translation } from '@dnb/eufemia/shared'


const translations = {
  'en-GB': {
    info: 'Use **bold** and _italic_ with a {br}line-break.',
  },
}


render(
  <Form.Handler translations={translations} locale="en-GB">
    <p>
      <Translation id={(t: any) => t.info} />
    </p>
  </Form.Handler>,
)

Use the shared Provider to customize translations

import { Form, Field } from '@dnb/eufemia/extensions/forms'
import { Provider, Translation } from '@dnb/eufemia/shared'


const myTranslations = {
  'nb-NO': {
    'PhoneNumber.label': 'Egendefinert',
    'custom.string': 'Min egendefinerte streng',
  },
  'en-GB': {
    'PhoneNumber.label': 'Custom',
    'custom.string': 'My custom string',
  },
}
type TranslationType = (typeof myTranslations)[keyof typeof myTranslations]


render(
  <Provider translations={myTranslations}>
    <Heading>
      <Translation<TranslationType> id={(t) => t.custom.string} />
    </Heading>


    <Form.Handler>
      <Field.PhoneNumber />
    </Form.Handler>
  </Provider>,
)

Fallback for missing or partial translations

Form.useTranslation will output missing keys when:

  • Empty explicit locale: returns pointer strings (e.g. MyNamespace.label) derived from fallbackLocale="nb-NO".
  • Partial explicit locale: merges missing keys as pointer strings, preserving existing ones.
  • Non-existent current locale (no explicit entry in your translations): the hook preserves defaults (no pointers).
import { Form } from '@dnb/eufemia/extensions/forms'


const translations = {
  'sv-SE': {}, // empty explicit current-locale
  'en-GB': { MyNamespace: { label: 'English label' } },
}


type T = (typeof translations)['en-GB']


function MyField() {
  const t = Form.useTranslation<T>({
    fallbackLocale: 'en-GB', // default: 'nb-NO'
  })
  return <>{t.MyNamespace.label /* 'MyNamespace.label' */}</>
}


render(
  <Form.Handler locale="sv-SE" translations={translations}>
    <MyField />
  </Form.Handler>,
)

Formatted messages

For richer inline formatting inside form translations, use the renderWithFormatting helper from @dnb/eufemia/shared.

More info about the supported formatting in the renderWithFormatting documentation.

import { Form } from '@dnb/eufemia/extensions/forms'
import { renderWithFormatting } from '@dnb/eufemia/shared'


const translations = {
  'en-GB': {
    'Field.info': 'Fill out the **form** and _submit_ {br}when ready.',
  },
}


type T = (typeof translations)['en-GB']


function MyComponent() {
  const t = Form.useTranslation<T>()


  return <>{renderWithFormatting(t.Field.info)}</>
}


function MyApp() {
  return (
    <Form.Handler translations={translations} locale="en-GB">
      <MyComponent />
    </Form.Handler>
  )
}