src/app/common/i18n/translate.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import {TranslateService} from '@ngx-translate/core';

export const TRANSLATE_STORAGE_KEY = 'fims-translate-lang';

export function getSelectedLanguage(translateService: TranslateService): string {
  const storedLanguage: string = sessionStorage.getItem(TRANSLATE_STORAGE_KEY);

  if (storedLanguage && translateService.getLangs().indexOf(storedLanguage) > -1) {
    return storedLanguage;
  } else if (translateService.getLangs().indexOf(translateService.getBrowserLang()) > -1) {
    return translateService.getBrowserLang();
  }

  return translateService.getDefaultLang();
}