Ernesto thanks for the help.
I made it work by using an AjaxEventBehavior and adding it directly to the
page, like so:
AjaxEventBehavior event = new AjaxEventBehavior("beforeunload") {
@Override
protected void onEvent(final AjaxRequestTarget target) {
// do stuff here
target.appendJavaScript("alert('are you sure want to navigate
away?');");
}
}
add(event);
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