Electron: Call renderer function from main

Question

I have some data in the localstorage that has to be deleted on app.quit(). But I see no way to do so from the main process.

Is there a way to call a

Answer 1

You can send messages from the main process to a renderer process via webContents.send as called out in the documentation here: https://github.com/atom/electron/blob/master/docs/api/web-contents.md#webcontentssendchannel-arg1-arg2-.

Here is how you do it straight from the docs:

In the main process:

// In the main process.
var window = null;
app.on('ready', function() {
  window = new BrowserWindow({width: 800, height: 600});
  window.loadURL('file://' + __dirname + '/index.html');
  window.webContents.on('did-finish-load', function() {
    window.webContents.send('ping', 'whoooooooh!');
  });
});

In index.html:

Note it is asynchronous. I am not sure how that affects things with your particular solution, but this should at least get you talking back to the renderer process.