Parameter of type 'DocumentDirection' Cannot read property ‘dir’ of undefined

@rootthenile wrote:

Hi I just make a multi language app with RTL for the menu

here’s my code in my Settings Page ts where the change language bottom there

export class SettingsPage {
  languageSelected : any = 'en';
  languages : Array<LanguageModel>;
  dir: string;

  constructor (
    public navCtrl: NavController,
    public translate: TranslateService,
    public languageService: LanguageService,
    public platform:Platform

  )


  {
    this.languages = this.languageService.getLanguages();
    this.setLanguage();
  }


  changeLanguage(languageId) {
    if (languageId === 'ar') {
      this.platform.setDir('rtl', true);
      this.translate.setDefaultLang(languageId);

    } else {
      this.platform.setDir('ltr', true);
      this.translate.setDefaultLang(languageId);
    }
  }


  setLanguage(){
    this.dir = this.dir == 'ltr' ? 'rtl' : 'ltr';
    this.platform.setDir(this.dir,true);
    let defaultLanguage = this.translate.getDefaultLang();
    if(this.languageSelected){
      this.translate.setDefaultLang(this.languageSelected);
      this.translate.use(this.languageSelected);

    }else{
      this.languageSelected = defaultLanguage;
      this.translate.use(defaultLanguage);
    }
  }

}

and I get error Cannot read property ‘dir’ of undefined

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