Electron - Hello World


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We have created a package.json file for our project. Now we will create our first desktop app using Electron.

Create a new file called main.js. Enter the following code in it −

const {app, BrowserWindow} = require('electron') 
const url = require('url') 
const path = require('path')  

let win  

function createWindow() { 
   win = new BrowserWindow({width: 800, height: 600}) 
   win.loadURL(url.format ({ 
      pathname: path.join(__dirname, 'index.html'), 
      protocol: 'file:', 
      slashes: true 
   })) 
}  

app.on('ready', createWindow) 

Create another file, this time an HTML file called index.html. Enter the following code in it.

<!DOCTYPE html>
<html>
   <head>
      <meta charset = "UTF-8">
      <title>Hello World!</title>
   </head>
   
   <body>
      <h1>Hello World!</h1>
      We are using node <script>document.write(process.versions.node)</script>,
      Chrome <script>document.write(process.versions.chrome)</script>,
      and Electron <script>document.write(process.versions.electron)</script>.
   </body>
</html>

Run this app using the following command −

$ electron ./main.js

A new window will open up. It will look like the following −

Electron Hello World

How Does This App Work?

We created a main file and an HTML file. The main file uses two modules – app and BrowserWindow. The app module is used to control your application’s event lifecycle while the BrowserWindow module is used to create and control browser windows.

We defined a createWindow function, where we are creating a new BrowserWindow and attaching a URL to this BrowserWindow. This is the HTML file that is rendered and shown to us when we run the app.

We have used a native Electron object process in our html file. This object is extended from the Node.js process object and includes all of t=its functionalities while adding many more.



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