Electron - How to know when renderer window is ready

Question

In my main process I create a renderer window:

var mainWindow = new BrowserWindow({
    height: 600,
    width: 800,
    x: 0,
    y: 0,
    frame: false,
           


        

Answer 1

Use mainWindow.webContents like this:

mainWindow.webContents.on('did-finish-load', () => {
  mainWindow.webContents.send('message', 'hello world');
}