Get started
Loading...
Important Notice - Forums is archived

To simplify things and help our users to be more productive, we have archived the current forum and focus our efforts on helping developers on Stack Overflow. You can post new questions on Stack Overflow or join our Discord channel.

Product icon
TUTORIAL

Vaadin lets you build secure, UX-first PWAs entirely in Java.
Free ebook & tutorial.

CssImport when using Component Exporter by Mikhail Shabarov, 1 month ago
Recent Posts
Vaadin Forum3. Vaadin 6, 7, 8Framework UI

How to display children for a MenuItem with a Command?

Mikko Kurki-Suonio
5 years ago Nov 15, 2016 1:46pm

I'm trying to avoid pre-populating menus due to performance reasons, so I want to populate the sub-menus only when the top level menu item is clicked.

If the top level MenuItem has a Command to process the incoming click, it CAN have visible children and with the debugger I can even see the server sending them to the browser...

...but the browser won't actually display them...

...until I set the top level command to NULL.

So far the best result I've managed is to populate the sub-menu on the first click, set to the command to null and then on the SECOND click the sub-items are actually shown.

Is there a better way to do this?