electron sending data from ipcMain to ipcRender

Question

In my React Component to load data from file in componentDidMount i make empty send ipcRenderer.send("loading", "go"); to activate ipcMain listener and make him send data to ipcRenderer listener in React Component. Can i make electron send data when app starts to ipcRenderer listener without empty sending.

React Component Code:

componentDidMount(){
ipcRenderer.send("loading", "go");

ipcRenderer.on("sending", (event, arg) => {
  let arg_sorted = arg.tasks.sort((a,b) => this.dateSord(a.date, b.date));
  this.setState({
    items: arg_sorted,
  });
});}

Electron:

ipcMain.on("loading", (event, arg) => {
   let data = store.parseFile();
   event.sender.send("sending", data); });

Answer 1

Can I make electron send data when app starts

Not immediately, because your BrowserWindow isn't ready yet. But you can use 'dom-ready' event to be in the right time.

win.webContents.on('dom-ready', () => {
  let data = ...
  win.webContents.send('sending', data)
})
win.loadURL(...)