In a way or another, the main process has to get involved, but communicating between the renderer processes of two windows can be achieved in some kind of straightforward way:
In the main process, define the window references as properties of the global object;
In each renderer process, access the reference of the window you want to send a message to by using remote.getGlobal (), then use the send () method;
Use ipcRenderer.on () the usual way to receive the message in each renderer process.
Here is a quick example of an Electron app which does just that:
main.js:
const { app, BrowserWindow } = require ('electron');
global.window1 = null;
global.window2 = null;
function onAppReady ()
{
window1 = new BrowserWindow ({ width: 600, height: 500 });
window1.loadURL (`file://${__dirname}/index1.html`);
window1.webContents.openDevTools ();
window1.on ('closed', () => { window1 = null; });
//
window2 = new BrowserWindow ({ width: 500, height: 600 });
window2.loadURL (`file://${__dirname}/index2.html`);
window2.webContents.openDevTools ();
window2.on ('closed', () => { window2 = null; });
}
app.on ('ready', onAppReady);
app.on ('window-all-closed', () => { app.quit (); });
index1.html:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Window 1</title>
</head>
<body>
<h1>Window 1</h1>
<button type="button" class="send-message">Send Message to Window 2</button>
<script>
const { remote, ipcRenderer } = require ('electron');
//
let button = document.querySelector ('.send-message');
button.addEventListener ('click', () =>
{
let window2 = remote.getGlobal ('window2');
if (window2) window2.webContents.send ('message', "Message from Window 1");
});
//
ipcRenderer.on ('message', (event, message) => { console.log (message); });
</script>
</body>
</html>
index2.html:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Window 2</title>
</head>
<body>
<h1>Window 2</h1>
<button type="button" class="send-message">Send Message to Window 1</button>
<script>
const { remote, ipcRenderer } = require ('electron');
//
let button = document.querySelector ('.send-message');
button.addEventListener ('click', () =>
{
let window1 = remote.getGlobal ('window1');
if (window1) window1.webContents.send ('message', "Message from Window 2");
});
//
ipcRenderer.on ('message', (event, message) => { console.log (message); });
</script>
</body>
</html>
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