JavaScript

Creating index.html in Electron.js

We already learned that the renderer processes would display the UI of your application. It will load content and execute it within its own thread. Now we'll create our renderer index.html file inside the same directory where the package.json resides:

1.  <!DOCTYPE html>
2.  <html>
3.   <head>
4.    <meta charset="UTF-8">
5.    <title>Hello World!</title>
6.   </head>
7.   <body>
8.   <h1>Hello World!</h1>
9.    <!-- All of the Node.js APIs are available in this renderer process.--> 
10.    We are using Node.js <script>document.write(process.versions.node)</script>,
11.    Chromium <script>document.write(process.versions.chrome)</script>,
12.    and Electron <script>document.write(process.versions.electron)</script>.
13.   <script>
14.    // You can also require other files to run in this process
15.    //require('./renderer.js')
16.   </script>
17.  </body>
18. </html>

This is a simple HTML file, as you can see from the comment, all of Node's APIs are available to the renderer process, which is why you have access to the process API (Line 10, 11, 12) that displays the version of Node.js , Chrome and Electron.js inside this HTML file.

You also can import the other .js files using Node's require keyword. At line 15, we've commented out the //require('./renderer.js') as its currently no necessary, but this will be the starting point for the JavaScript for our application.

Running the application

These three files: package.json, main.js and index.html are enough to get it run in our simple application. To run your first app, execute the following command from the app source directory:

npm start


Running app from the command prompt in Windows 10

You should see something similar to following image on your screen.


Electron's hello world app window

See errors using Chrome DevTools

Electron supports the Chrome DevTools Extension, which can be used to extend the ability of devtools for debugging popular web frameworks. See https://electronjs.org/docs/tutorial/devtools-extension.

To enable Chrome DevTools:

  1. Open main process file main.js
  2. Find the line where you loaded index.html file at mainWindow . loadURL ('file://' + __dirname + '/index.html').
  3. Add mainWindow .webContents .openDevTools() after the above line.

Now close your app if already running then re-run again and you should see something similar to following image on your screen.


Electron's hello world app, DevTools enabled

Quick start (without writing the code)

To obtain Electron's quick start code, you will need to have following software installed on your computer:

This following command creates a copy of the electron-quick-start repository inside the duplicate-files-finder folder in the path from which the command was made:

git clone https://github.com/electron/electron-quick-start duplicate-files-finder

cd duplicate-files-finder

npm install

npm start

The npm install will install the dependencies of the above repository (including Electron). The npm start will execute the app.

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