saugatdai/Renderer.js

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'">
    <link href="./styles.css" rel="stylesheet">
    <title>Hello World!</title>
  </head>
  <body>
    <button id="click">Print</button>
    <!-- You can also require other files to run in this process -->
    <script src="./renderer.js"></script>
  </body>
</html>

## main.js
// Modules to control application life and create native browser window
const { app, BrowserWindow, ipcMain } = require('electron')
const path = require('path')

let mainWindow;

function createWindow() {
  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      preload: path.join(__dirname, 'preload.js')
    }
  })

  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.whenReady().then(() => {
  createWindow()

  app.on('activate', function () {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
})

// Quit when all windows are closed, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

ipcMain.on('print', async () => {
  const printers = await mainWindow.webContents.getPrintersAsync();
  console.log(printers);
  mainWindow.webContents.print({
    silent: true,
    deviceName: 'POS80QMS' ,
    printBackground: true,
    copies: 1,
    pageSize: {
      height: 2000,
      width: 2000
    }
  }, (success, error) => {
    if(success){
      console.log('printed');
    }else{
      console.log('failed');
    }
  })
});

## preload.js
const {ipcRenderer} = require('electron');

// All of the Node.js APIs are available in the preload process.
// It has the same sandbox as a Chrome extension.
window.addEventListener('DOMContentLoaded', () => {
  document.querySelector('#click').addEventListener('click', () => {
    ipcRenderer.send('print');
  })

});

## Renderer.js
// This file is required by the index.html file and will
// be executed in the renderer process for that window.
// No Node.js APIs are available in this process because
// `nodeIntegration` is turned off. Use `preload.js` to
// selectively enable features needed in the rendering
// process.

## styles.css
/* styles.css */

/* Add styles here to customize the appearance of your app */
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
	<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'">
	<link href="./styles.css" rel="stylesheet">
	<title>Hello World!</title>
	</head>
	<body>
	<button id="click">Print</button>
	<!-- You can also require other files to run in this process -->
	<script src="./renderer.js"></script>
	</body>
	</html>
	// Modules to control application life and create native browser window
	const { app, BrowserWindow, ipcMain } = require('electron')
	const path = require('path')

	let mainWindow;

	function createWindow() {
	// Create the browser window.
	mainWindow = new BrowserWindow({
	width: 800,
	height: 600,
	webPreferences: {
	preload: path.join(__dirname, 'preload.js')
	}
	})

	// and load the index.html of the app.
	mainWindow.loadFile('index.html')

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()
	}

	// This method will be called when Electron has finished
	// initialization and is ready to create browser windows.
	// Some APIs can only be used after this event occurs.
	app.whenReady().then(() => {
	createWindow()

	app.on('activate', function () {
	// On macOS it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (BrowserWindow.getAllWindows().length === 0) createWindow()
	})
	})

	// Quit when all windows are closed, except on macOS. There, it's common
	// for applications and their menu bar to stay active until the user quits
	// explicitly with Cmd + Q.
	app.on('window-all-closed', function () {
	if (process.platform !== 'darwin') app.quit()
	})

	// In this file you can include the rest of your app's specific main process
	// code. You can also put them in separate files and require them here.

	ipcMain.on('print', async () => {
	const printers = await mainWindow.webContents.getPrintersAsync();
	console.log(printers);
	mainWindow.webContents.print({
	silent: true,
	deviceName: 'POS80QMS' ,
	printBackground: true,
	copies: 1,
	pageSize: {
	height: 2000,
	width: 2000
	}
	}, (success, error) => {
	if(success){
	console.log('printed');
	}else{
	console.log('failed');
	}
	})
	});
	const {ipcRenderer} = require('electron');

	// All of the Node.js APIs are available in the preload process.
	// It has the same sandbox as a Chrome extension.
	window.addEventListener('DOMContentLoaded', () => {
	document.querySelector('#click').addEventListener('click', () => {
	ipcRenderer.send('print');
	})

	});
	// This file is required by the index.html file and will
	// be executed in the renderer process for that window.
	// No Node.js APIs are available in this process because
	// `nodeIntegration` is turned off. Use `preload.js` to
	// selectively enable features needed in the rendering
	// process.
	/* styles.css */

	/* Add styles here to customize the appearance of your app */