ng-telegram-webapp

This Angular library provides a set of tools to create Telegram WebApps with ease. It wraps the Telegram WebApp API in a convenient Angular service to streamline the development of your Telegram WebApp. For more information on Telegram Web Apps, please visit the official documentation.

Prerequisites

Before using this library, you need to include the Telegram WebApp JavaScript API in your project. Add the following script tag to the head section of your index.html file:

<script src="https://telegram.org/js/telegram-web-app.js"></script>

Features

• Angular services for interacting with the Telegram WebApp API.
• Reactive event handling with RxJS observables.
• UI manipulation methods for the Telegram WebApp environment.
• Cloud storage utilities for Telegram data.
• Payment invoice handling for Telegram's payment system.
• QR code scanning functionality.

Installation

Install the library using npm:

npm install @zakarliuka/ng-telegram-webapp --save

Usage

Service Injection

Inject the TelegramWebappService into your components to interact with the Telegram WebApp:

import { Component, OnInit } from '@angular/core';
import { TelegramWebappService } from '@zakarliuka/ng-telegram-webapp';

@Component({
  selector: 'app-root',
  template: `<!-- Your template here -->`
})
export class AppComponent implements OnInit {
  private readonly telegramService = inject(TelegramWebappService)

  ngOnInit() {
    console.log(this.telegramService.initData);
  }
}

Event Subscription

Subscribe to Telegram WebApp events using the service:

this.telegramService.onEvent('mainButtonClicked').subscribe(() => {
  // Handle the main button click event
});

UI Customization

Customize the WebApp UI using the service methods:

this.telegramService.setHeaderColor('#FFFFFF');

Examples

The TelegramWebappService provides a comprehensive interface to the Telegram WebApp API. Here are the features with corresponding code snippets:

Initialization Data

Retrieve initialization data passed to the Mini App:

// Raw data as a string
console.log(this.telegramService.initData);

// Object with input data
console.log(this.telegramService.initDataUnsafe);

UI and Appearance

Access and modify the UI elements of the Telegram WebApp:

// Access color scheme
console.log(this.telegramService.colorScheme);

// Set header color
this.telegramService.setHeaderColor('#FFFFFF');

// Set background color
this.telegramService.setBackgroundColor('#F0F0F0');

App Control

Control the state and presentation of the Mini App:

// Inform the Telegram app that the Mini App is ready
this.telegramService.ready();

// Expand the Mini App to the maximum height
this.telegramService.expand();

// Close the Mini App
this.telegramService.close();

// Enable confirmation dialog on close
this.telegramService.enableClosingConfirmation();

// Disable confirmation dialog on close
this.telegramService.disableClosingConfirmation();

Event Handling

Handle events emitted by the Telegram WebApp:

// Subscribe to the main button click event
this.telegramService.onEvent('mainButtonClicked').subscribe(() => {
  // Handle the event
});

Data Management

Send data to the bot when the Mini App is closed:

// Send data to the bot
this.telegramService.sendData({ key: 'value' });

QR Code Scanning

Show and handle QR code scanning:

// Show QR code scanner
this.telegramService.showScanQrPopup().subscribe((qrCodeText) => {
  console.log(qrCodeText);
  if(checkQr(qrCodeText)) {
    this.telegramService.closeScanQrPopup()
  }
});

External Links

Open links externally or within the Telegram app:

// Open an external link
this.telegramService.openLink('https://example.com');

// Open a link in the Telegram app
this.telegramService.openTelegramLink('https://t.me/example_bot');

Payments

Handle payment invoices:

// Open an invoice
this.telegramService.openInvoice('INVOICE_URL').subscribe((status) => {
  console.log(status);
});

Popups and Alerts

Display popups and alerts to the user:

// Show a popup
this.telegramService.showPopup({ message: 'Hello, World!' }).subscribe((buttonId) => {
  console.log(buttonId);
});

// Show an alert
this.telegramService.showAlert('Alert Message').subscribe(() => {
  // Alert dismissed
});

// Show a confirmation dialog
this.telegramService.showConfirm('Confirm this action?').subscribe((confirmed) => {
  console.log(confirmed);
});

Permissions and Access

Request permissions or access to user data:

// Request write access
this.telegramService.requestWriteAccess().subscribe((granted) => {
  console.log(granted);
});

// Request user's contact
this.telegramService.requestContact().subscribe((contact) => {
  console.log(contact);
});

// Read text from the clipboard
this.telegramService.readTextFromClipboard().subscribe((text) => {
  console.log(text);
});

Inline Queries

Insert inline queries into the chat input field:

// Switch to inline query
this.telegramService.switchInlineQuery('query');

Device Features

Utilize device features like haptic feedback:

// Trigger haptic feedback
this.telegramService.hapticFeedback.impactOccurred('light');

Cloud Storage

Interact with Telegram's cloud storage:

// Save data to cloud storage
this.telegramService.cloudStorage.set('key', 'value');

// Retrieve data from cloud storage
this.telegramService.cloudStorage.get('key').subscribe((value) => {
  console.log(value);
});

UI Elements

Manage UI elements like the back and main buttons:

this.telegramService.backButton.show().subscribe(() => {
  console.log('navigate back');
  this.telegramService.backButton.hide()
})

this.telegramService.mainButton.setText('Click Me');
this.telegramService.mainButton.show().subscribe(() => {
  console.log('main button clicked');
  this.telegramService.backButton.hide()
}) 

Support

If you have any questions or encounter any issues, please feel free to open an issue on our GitHub repository.

License

This library is licensed under the MIT License. See the LICENSE file for full details.