Question:

How to pass data via Custom Event from JS to Java?

Passing data from JavaScript to Java involves interacting with the Java code through a mechanism that allows communication between the two languages. One common approach is to use JavaFX's WebView component to run JavaScript code and handle communication using the WebEngine class. Here's a basic example:

Vaadin does not submit all properties of the event by default, you need to give it a hint. For example I'm doing this in my> >recent React example:

getElement().addEventListener("color-change", e -> {

var newValue = e.getEventData().getString("event.hex");

setModelValue(newValue, true);

})

.addEventData("event.hex")

In your case that could be:

.addEventData("event.detail")

And then accessing that boolean:

e.getEventData().getBoolean("event.detail")

Alternatively, you can create a custom event and declare the transferred details with annotations, as described in other answers, but that requires quite a lot more code.

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