Telegraf Inline Menu (telegram-inline-menu)

A package to build and handle telegraf inline keyboard menus.

This package provides you a way of structuring the menus as Javascript objects. You can define onPress actions of the buttons, navigate through the menus by setting navigate property to a path of a menu or using relative navigation such as ".." to go to parent menu, or numberic index indicating the creation order of the menu or relative negative index.

NOTE: To track last changes, please see the CHANGELOG file.

The example has many examples of usages inside.

Examples

import { CBHandler, inlineMenu, IMenu } from 'telegram-inline-menu'

function sleep(ms: number) {
  return new Promise(resolve => setTimeout(resolve, ms))
}

const menuLayout: IMenu = {
  id: 'main',
  text: 'Main menu, this menu has random ID.',
  buttons: {
    hello: 'Hello!',
    url: {
      text: 'GitHub',
      url: 'https://github.com',
    },
    countdown: {
      text: 'Countdown from 5',
      async * onPress(ctx, id, text, menu) {
        yield { message: 'About to countdown…' }
        await sleep(1000)
        yield { message: 'See the button text now' }
        for (let i = 5; i > 0; --i) {
          yield { text: `Last ${i}...` }
          await sleep(1000)
        }

        yield { closeWith: 'Operation is completed' }
      }
    },
    subMenu: {
      text: 'This is the inner menu after main',
      buttonText: 'Sub Menu',
      full: true,
      buttons: {
        back: { text: 'Go Back', navigate: '..' },
        nextMenu: { text: 'Go Next', navigate: '../thirdMenu' }
      }
    },
    thirdMenu: {
      text: 'This is the third menu belonging to the main, but not from main',
      hide: true,
      buttons: {
        back: { text: 'Back', navigate: -1 },
        update: {
          text: 'Update Text',
          onPress() {
            return { message: 'Third menu text is updated' }
          }
        },
        close: {
          text: 'Close',
          full: true,
          onPress() {
            return {
              close: true
            }
          }
        }
      }
    }
  }
}

// Optionally you can register a method missing handler if any of your buttons
// do not have `onPress` property.
CBHandler.onMethodMissing((text, path, query) => {
  console.log('A button with text', text, 'on', path, 'is pressed')
})

const telegraf = new Telegraf('YOUR_TOKEN')
CBHandler.attach(telegraf)

telegraf.on('text', async ctx => {
  await CBHandler.showMenu(ctx, inlineMenu(layout))
})

telegraf.startPolling()
telegraf.launch().catch(console.error)

Setup

Setup is as it is shown in the example.

• Import the components of this package.

• Optionally use CBHandler.onMethodMissing.

• Get a menu builder instance by inlineMenu(layout) function by giving the menu layout.

• Register the menu to CBHandler to allow other registered menus use each others path and IDs.

• Attach the CBHandler to the Telegraf instance. This will use callback_query handler to show the related menu or take the action.

• Show menu by CBHandler.showMenu(context, menuBuilder) to send the menu as a separate message.

Components

The library has several components inside, which all should have their own part to interact with user and the other components.

CallbackQueryHandler

A CallbackQueryHandler class is to keep/track the menus inside attached to a Telegraf instance so that it could manage the transitions between menus, like when a menu button has a navigation path such as /secondary/ so that another menu should appear, and also the class uses a "keeper" object which is used to relate the menu instances with it in a WeakMap. Hence, if you have another library or some other object keeping the data of your bot, you can use it as the keeper of the class instance so that whenever that keeper is garbage collected, the other menu instances will also be able to be garbage collected. To set a custom keeper, you can use CallbackQueryHandler.setMenuKeeper(obj) function. By default, the given instance by the library uses itself as a keeper.

Likewise this component has onMethodMissing function which has buttonText, buttonPath, and the CallbackQuery object of the Telegraf. This function could be used when your layout does not define a onPress function for your button. You can get the ID of the button from its path.

You should attach your CallbackQueryHandler instance to your Telegraf instance. If you want to have more instance, just create with new. Normally, this library provides you an instance already named CBHandler.

MenuBuilder

This class provides another way of building menus, you will have functions like button(), menu(), navigate() and such. With these functions you can build your menu likewise.

Don't forget that you should end() your button builders before building another one and also you should end()/endMenu() your menu before building some other menu.

Building a menu inside a menu is actually just having another button navigating to another menu builder.

There is also a inlineMenu(layout) function provided by the library that takes a layout object and returns a builder. It returns a builder because you may also want to continue building the menu from that part or pass the instance around your functions. Or, you can change a several parts of your menu every time, for example, a function is called.

It is why the library functions wants MenuBuilder instances instead of the built Menu instance.

The same menu layout of above with MenuBuilder

new MenuBuilder('Main menu, this menu has "main" id', 'main')
  .button('Hello!', 'hello').end()
  .button('GitHub', 'url').setUrl('https://github.com').end()
  .button('Countdown from 5', 'countdown').setOnPress(async function* () {
    yield { message: 'About to countdown…' }
    await sleep(1000)
    yield { message: 'See the button text now' }
    for (let i = 5; i > 0; --i) {
      yield { text: `Last ${i}...` }
      await sleep(1000)
    }

    yield { closeWith: 'Operation is completed' }
  }).end()

  .menu('This is the inner menu after main', 'Sub Menu', 'subMenu', true)
  .navigation('Go Back', '..', 'back').end()
  .navigation('Go Next', '../thirdMenu', 'nextMenu').end()
  .endMenu()

  .menu('This is the third menu belonging to the main, but not froun main', 'thirdMenu', false, true)
  .navigation('Back', -1, 'back').end()
  .button('Update Text', 'update').setOnPress(() => ({ message: 'Third menu text is updated' })).end()
  .button('Close', 'close').setFull(true).setOnPress(() => ({ close: true })).end()
  .endMenu()

  .endMenu()

Notes

• Any object having buttons object property will be assumed as a menu.
• text property of a menu indicates the message that will be shown to user.
• onPress() functions might be async, generator-returning or async generator functions. If the function is (async) generator, an object affecting the next step could be returned every time, as you can see in the example.
• navigate property may be a string indicating the id of the menu, which is simply the property name of the menu, or a path of a menu such as /main/subMenu/ or a relative path such as ../siblingMenu or an index such as -1 indicating the one previous from the menu that the button is in.
• full property of buttons indicates whether the button should be full-width.
• full and hide properties may have a (async) function determining the state of the button.

Caveats

• Since the ContextMessageUpdate of the Telegraf may be used in async function it will be blocked/prevented to do changes on the Telegram. So be careful about your async functions, if possible use them with timeouts possibly with Promise.race.

• To prevent collisions when any of the menus sent closed, the menus without their id property is set, will be set automatically. So if you want to use absolute paths to open a menu, be sure that you set a unique id for that menu. Or, simply use relative paths.

• If your menu is not closed, it is still kept in map so that if you send the same menu again, the buttons and the message might not be shown as expected.

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