How to close the Browser Window using ZK framework? - zk

Question

I need to close the Browser Window Tab, please note not the window widget but the Browser window tab, using ZK framework version CE-9.0.0.
I have already tried the following code segments but no luck:
Clients.confirmClose(null);
Executions.deactivate(page.getDesktop());
page.setComplete(true);
page.removeComponents();
page.invalidate();
Is there any API or way to achieve this using ZK and/or JavaScript?
Is there any way to get the reference to the browser window tab, so that it can be closed programmatically, in ZK and/or JavaScript?
Please note: This window tab is opened manually & not by JavaScript or any other program.
Thanks,
RAS

Answer 1

Close the browser tab from a server directly is not allowed. But you can show a modal window to ask a user to close a browser tab like:
<zk xmlns:ca="client/attribute">
...
<window mode="modal" title="Close the browser tab">
<button label="Yes" ca:onClick="window.close();"/>
</window>
</zk>
Because close() is invoked by users, it will close the browser tab. This could be an alternative. Although it doesn't close a browser tab directly, the modal window covers the whole page. Users can't do anything but to click "yes", so I think most users will just click "yes" to close.
I found it works in Chrome 80, but will fail at Chrome 81. So it's not a good way

Answer 2

The JS to close a window is window.close(), this is a well documented standard browser API. (also answered here)
From a ZK application (server-side) you can call this script via:
Clients.evalJavaScript("window.close()");
However this browser API has strict limitations: In modern browsers you can only close windows via close() that were also opened by javascript. So you can't close the current window in case the user navigated there manually - no way around that, except for using an old browser, which I won't recommend.
e.g. that's what you'll get in Chrome (#81)