In a main window, when a button is clicked, the second/child window will popped up via an ipc call. This works when open the pop window on the first time. If I closed the pop window and reopen it again, I will get this error:

Uncaught Exception: Error: Object has been destroyed at Error (native) at EventEmitter. (/home/xxxx/electron/fin/main.js:36:21) at emitOne (events.js:96:13) at EventEmitter.emit (events.js:188:7) at EventEmitter. (/home/xxxx/electron/fin/node_modules/electron-prebuilt/dist/resources/) at emitTwo (events.js:106:13) at EventEmitter.emit (events.js:191:7)

#main.js on app ready:
mainWindow = new BrowserWindow({width: 800, height: 600}) mainWindow.loadURL(`file://${__dirname}/index.html`) mainWindow.webContents.openDevTools() mainWindow.on('closed', function () { mainWindow = null }) let popWindow = new BrowserWindow({parent: mainWindow, width: 450, height: 450, show: false}); popWindow.loadURL(`file://${__dirname}/app/pop.html`); popWindow.webContents.openDevTools(); ipc.on('toggle-popwindow', function(){ popWindow.show(); });

And when I add hide() in the 'closed' method:

popWindow.on('closed', function (event) {
popWindow.hide();
});

I get this:

Uncaught Exception:
Error: Object has been destroyed

What is the problem?

2 Answers

when popWindow is closed,you should set popWindow to null. when the next open request from the ipc, instance popWindow again.

mainWindow = new BrowserWindow({width: 800, height: 600})
mainWindow.loadURL(`file://${__dirname}/index.html`)
mainWindow.webContents.openDevTools()
mainWindow.on('closed', function () { mainWindow = null popWindow=null;
})
ipc.on('toggle-popwindow', function(){ if(!popWindow){ openPopWindow(function(){ popWindow.show(); }); } else{ popWindow.show(); }
});
function openPopWindow(callback){ let popWindow = new BrowserWindow({parent: mainWindow, width: 450, height: 450, show: false}); popWindow.loadURL(`file://${__dirname}/app/pop.html`); popWindow.webContents.openDevTools(); popWindow.webContents.on('did-finish-load', function () { if (typeof callback == 'function') { callback(); } }); // set to null popWindow.on('close', () => { popWindow = null; }); // set to null popWindow.on('closed', () => { popWindow = null; });
}

If you close a browser window it will be destroyed, so you can't hide or show it again after that. Since you want to hide it and show it again later your should add a listener for the close event that calls preventDefault() and hides the window instead of closing it.

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