Update Value of Label during long runtime

Vaadin 6 / 7 / 8
1

Hello!

I want to update the value of a textfield during the runtime of a ClickListener.

The whole process takes 30 seconds, and I want to display something in a Textfield to show the users that the program is running.
How can i do that? I tried to set it with setValue, but that only changes after the exectue is done.

Thanks for the help and if you need some snippets, ask away!

Best Regards,
Patrick

2

Hello Patrick,

I think this documentation about asynchronous Updates could be the solution to your problem

https://vaadin.com/docs/v12/flow/advanced/tutorial-push-access.html

You have to create and run a Thread when the button is clicked, when the thread finishes (after 30 seconds in you case) you can update the UI’s components from the thread like this:

ui.access(() -> {
    statusLabel.setText(statusText);
    ui.push();
});

If the push mode is manual, you need to push the pending UI changes to the browser explicitly with the push() method.

You can set the push mode using the @Push annotation. If the push is set to automatic, you do not need to write ui.push();.