Engine API Reference - v2.7.1
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    Class I18n

    Handles localization. Responsible for loading localization assets and returning translations for a certain key. Can also handle plural forms. To override its default behavior define a different implementation for I18n#getText and I18n#getPluralText.

    Hierarchy (View Summary)

    Index

    Constructors

    constructor

    Accessors

    assets locale

    Methods

    addData destroy findAvailableLocale fire getPluralText getText hasEvent off on once removeData

    Constructors

    Accessors

    • get assets(): number[] | Asset[]

      Gets the array of asset ids that contain localization data in the expected format.

      Returns number[] | Asset[]

    • set assets(value: number[] | Asset[]): void

      Sets the array of asset ids or assets that contain localization data in the expected format. I18n will automatically load translations from these assets as the assets are loaded and it will also automatically unload translations if the assets get removed or unloaded at runtime.

      Parameters

      • value: number[] | Asset[]

      Returns void

    • get locale(): string

      Gets the current locale.

      Returns string

    • set locale(value: string): void

      Sets the current locale. For example, "en-US". Changing the locale will raise an event which will cause localized Text Elements to change language to the new locale.

      Parameters

      • value: string

      Returns void

    Methods

    • Adds localization data. If the locale and key for a translation already exists it will be overwritten.

      Parameters

      • data: any

        The localization data. See example for the expected format of the data.

      Returns void

      this.app.i18n.addData({
          header: {
              version: 1
          },
          data: [{
              info: {
                  locale: 'en-US'
              },
              messages: {
                  "key": "translation",
                  // The number of plural forms depends on the locale. See the manual for more information.
                  "plural_key": ["one item", "more than one items"]
              }
          }, {
              info: {
                  locale: 'fr-FR'
              },
              messages: {
                  // ...
              }
          }]
      });

    • Returns the first available locale based on the desired locale specified. First tries to find the desired locale in the loaded translations and then tries to find an alternative locale based on the language.

      Parameters

      • desiredLocale: string

        The desired locale e.g. en-US.

      Returns string

      The locale found or if no locale is available returns the default en-US locale.

      const locale = this.app.i18n.getText('en-US');

    • Fire an event, all additional arguments are passed on to the event listener.

      Parameters

      • name: string

        Name of event to fire.

      • Optionalarg1: any

        First argument that is passed to the event handler.

      • Optionalarg2: any

        Second argument that is passed to the event handler.

      • Optionalarg3: any

        Third argument that is passed to the event handler.

      • Optionalarg4: any

        Fourth argument that is passed to the event handler.

      • Optionalarg5: any

        Fifth argument that is passed to the event handler.

      • Optionalarg6: any

        Sixth argument that is passed to the event handler.

      • Optionalarg7: any

        Seventh argument that is passed to the event handler.

      • Optionalarg8: any

        Eighth argument that is passed to the event handler.

      Returns EventHandler

      Self for chaining.

      obj.fire('test', 'This is the message');

    • Returns the pluralized translation for the specified key, number n and locale. If the locale is not specified it will use the current locale.

      Parameters

      • key: string

        The localization key.

      • n: number

        The number used to determine which plural form to use. E.g. For the phrase "5 Apples" n equals 5.

      • Optionallocale: string

        The desired locale.

      Returns string

      The translated text. If no translations are found at all for the locale then it will return the en-US translation. If no translation exists for that key then it will return the localization key.

      // manually replace {number} in the resulting translation with our number
      const localized = this.app.i18n.getPluralText('{number} apples', number).replace("{number}", number);

    • Returns the translation for the specified key and locale. If the locale is not specified it will use the current locale.

      Parameters

      • key: string

        The localization key.

      • Optionallocale: string

        The desired locale.

      Returns string

      The translated text. If no translations are found at all for the locale then it will return the en-US translation. If no translation exists for that key then it will return the localization key.

      const localized = this.app.i18n.getText('localization-key');
      const localizedFrench = this.app.i18n.getText('localization-key', 'fr-FR');

    • Test if there are any handlers bound to an event name.

      Parameters

      • name: string

        The name of the event to test.

      Returns boolean

      True if the object has handlers bound to the specified event name.

      obj.on('test', () => {}); // bind an event to 'test'
      obj.hasEvent('test'); // returns true
      obj.hasEvent('hello'); // returns false

    • Detach an event handler from an event. If callback is not provided then all callbacks are unbound from the event, if scope is not provided then all events with the callback will be unbound.

      Parameters

      • Optionalname: string

        Name of the event to unbind.

      • Optionalcallback: HandleEventCallback

        Function to be unbound.

      • Optionalscope: any

        Scope that was used as the this when the event is fired.

      Returns EventHandler

      Self for chaining.

      const handler = () => {};
      obj.on('test', handler);

      obj.off(); // Removes all events
      obj.off('test'); // Removes all events called 'test'
      obj.off('test', handler); // Removes all handler functions, called 'test'
      obj.off('test', handler, this); // Removes all handler functions, called 'test' with scope this

    • Attach an event handler to an event.

      Parameters

      • name: string

        Name of the event to bind the callback to.

      • callback: HandleEventCallback

        Function that is called when event is fired. Note the callback is limited to 8 arguments.

      • Optionalscope: any = ...

        Object to use as 'this' when the event is fired, defaults to current this.

      Returns EventHandle

      Can be used for removing event in the future.

      obj.on('test', (a, b) => {
          console.log(a + b);
      });
      obj.fire('test', 1, 2); // prints 3 to the console

      const evt = obj.on('test', (a, b) => {
          console.log(a + b);
      });
      // some time later
      evt.off();

    • Attach an event handler to an event. This handler will be removed after being fired once.

      Parameters

      • name: string

        Name of the event to bind the callback to.

      • callback: HandleEventCallback

        Function that is called when event is fired. Note the callback is limited to 8 arguments.

      • Optionalscope: any = ...

        Object to use as 'this' when the event is fired, defaults to current this.

      Returns EventHandle

      • can be used for removing event in the future.
      obj.once('test', (a, b) => {
          console.log(a + b);
      });
      obj.fire('test', 1, 2); // prints 3 to the console
      obj.fire('test', 1, 2); // not going to get handled

    • Removes localization data.

      Parameters

      • data: any

        The localization data. The data is expected to be in the same format as I18n#addData.

      Returns void

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