final Form<?> form = new Form<>("form"); form.setOutputMarkupId(true).setOutputMarkupPlaceholderTag(true); add(form .add(new FeedbackPanel("feedback")) .add(new AjaxButton("button") { @Override protected void onSubmit(AjaxRequestTarget target, Form<?> form) { info(System.currentTimeMillis()); target.add(form); try { TimeUnit.SECONDS.sleep(1); } catch (InterruptedException e) { e.printStackTrace(); } } @Override protected void updateAjaxAttributes(AjaxRequestAttributes attributes) { super.updateAjaxAttributes(attributes); attributes.getAjaxCallListeners().add(new AjaxCallListener() .onBefore("$('#" + getMarkupId() + "').prop('disabled',true);") .onComplete("$('#" + getMarkupId() + "').prop('disabled',false);")); } }));