Localization

Demo

Demo Page / Demo Component

i18n General Documentation

For more information about i18n, you can read this article and the official React documentation

Installation

Install the react-i18n library with a backend loader, typically i18next-xhr-backend

Install NPM package

npm install react-i18n i18next-xhr-backend

Main.ts

configure i18n loader with assets folder

import i18n from 'i18next';
import Backend from 'i18next-http-backend';

i18n
  .use(Backend)
  .use(initReactI18next) // passes i18n down to react-i18next
  .init({
    // the translations
    // (tip move them in a JSON file and import them,
    // or even better, manage them via a UI: https://react.i18next.com/guides/multiple-translation-files#manage-your-translations-with-a-management-gui)
    // backend: {
    //     loadPath: 'assets/locales/{{lng}}/{{ns}}.json',
    // },
    resources: {
      en: { translation: localeEn },
      fr: { translation: localeFr },
    },
    lng: 'en',
    fallbackLng: 'en',
    debug: false,
    interpolation: {
      escapeValue: false // react already safes from xss => https://www.i18next.com/translation-function/interpolation#unescape
    }
  });

Class sample

You need to add a translation key via the property headerKey to each column definition, for example: headerKey: 'TITLE'

Note

For the Select Filter, you will use labelKey instead of label. Anytime a translation key will come in play, we will add the word key to the end (hence headerKey, labelKey, more to come...)

import { Formatters } from 'slickgrid-react';
import i18next, { TFunction } from 'i18next';
import { withTranslation } from 'react-i18next';

interface Props {
  t: TFunction;
}
interface State extends BaseSlickGridState {
  gridOptions: GridOption;
  columnDefinitions: Column[];
  dataset: any[];
  selectedLanguage: string;
}

// create a custom translate Formatter
function taskTranslateFormatter: Formatter = (row, cell, value, columnDef, dataContext, grid) => {
  const gridOptions: GridOption = (grid && typeof grid.getOptions === 'function') ? grid.getOptions() : {};
  return gridOptions.i18n?.t('TASK_X', { x: value }) ?? '';
}

export class Example extends React.Component<Props, State> {
  constructor(public readonly props: Props) {
    super(props);
    // define the grid options & columns and then create the grid itself
    this.defineGrid();
  }

  // Define grid Options and Columns
  // provide a headerKey for each column and enableTranslate to True in GridOption
  defineGrid() {
    const columnDefinitions = [
      { id: 'title', name: 'Title', field: 'title', headerKey: 'TITLE', formatter: this.taskTranslateFormatter, sortable: true, minWidth: 100 },
      { id: 'duration', name: 'Duration (days)', field: 'duration', headerKey: 'DURATION', sortable: true, minWidth: 100 },
      { id: 'start', name: 'Start', field: 'start', headerKey: 'START', formatter: Formatters.dateIso, minWidth: 100 },
      { id: 'finish', name: 'Finish', field: 'finish', headerKey: 'FINISH', formatter: Formatters.dateIso, minWidth: 100 },
      { id: 'completed', name: 'Completed', field: 'completed', headerKey: 'COMPLETED', formatter: Formatters.translate, params: { i18n: i18next }, sortable: true, minWidth: 100 }
      // OR via your own custom translate formatter
      // { id: 'completed', name: 'Completed', field: 'completed', headerKey: 'COMPLETED', formatter: translateFormatter, sortable: true, minWidth: 100 }
    ];
    const gridOptions = {
      autoResize: {
        containerId: 'demo-container',
        sidePadding: 15
      },
      enableAutoResize: true,
      enableTranslate: true,
      i18n: i18next,
    };
  }
}

Custom Formatter (cell values)

You can define your own custom Formatter by providing the i18n Service into the Formatter and using the .tr() function to translate the cell value.

const taskTranslateFormatter: Formatter = (row, cell, value, columnDef, dataContext, grid) => {
  const gridOptions: GridOption = (grid && typeof grid.getOptions === 'function') ? grid.getOptions() : {};
  return gridOptions.i18n?.t('TASK_X', { x: value }) ?? '';
}

Using slickgrid-react Formatters.Translate

Instead of defining a custom formatter over and over, you could also use the built-in slickgrid-react Formatters.translate. However for the formatter to work, you need to provide the i18n Service instance, you can do so using the params properties which is made to pass any type of data, however you need to pass it with this structure: params: { i18n: i18next } .

const columnDefinitions = [
  {
    id: 'title',
    name: 'Title',
    field: 'title',
    headerKey: 'TITLE',
    formatter: Formatters.translate,
    params: { i18n: i18next } // provide the `i18n instance through the params.i18n property
  }
];

Passing i18n in the Grid Options for Formatter

The best and quick way to pass the i18n service is to pass it through the generic params grid option. However make sure that you use the following structure: params: { i18n: i18next } .

const gridOptions = {
  enableTranslate: true,
  params: { i18n: i18next } // provide the `i18n instance through the params.i18n property
};

Locales

The final step is of course the actual translations. There's multiple ways to copy them to your assets folder. See below for a few ways:

1. Manually copy the translation keys/values
2. Manually copy the JSON files to your assets folder
3. For React-CLI, you can modify react.json file to copy the JSON files to your assets folder via a copy scripts.
   • You can implement something like the following (I did not test this one, please report back if this is not accurate)

"copyFiles": {
  "node_modules/slickgrid-react/i18n/*.json": "assets"
}

3. Or modify your package.json and add a script to copy the JSON files to your assets folder
   • install NPM packages cross-env and copyfiles (npm install copy-files cross-env)
   • add a new script in your package.json
   • run the below script once with npm run copy:i18n and you should now have the JSON files in your src/assets folder

"copy:i18n": "cross-env copyfiles -f node_modules/slickgrid-react/i18n/*.json assets/i18n"

If you want to manually re-create the translation in your own files, the list of translations that you will need are displayed in the asset i18n translation folder (from that file, you need all translations shown before the 'BILLING', the next few ones are for the demo page only).

Date Picker - Flatpickr Localization

If you use multiple locale, you will also need to import necessary Flatpickr Locale, for more info see this Flatpickr Localization Wiki