how to submit a form automatically in javafx -

i want create cbt in javafx , run problem of not knowing how submit form automatically if time elapsed , may 1 of students yet finish test. also, want know how disable form in javafx

disabling node can done calling node.setdisable(true). since children automatically disabled, parent of nodes want disable, long there no other children should not disabled.

a timeout can implemented using scheduledexecutorservice:

private scheduledexecutorservice executorservice;  @override public void start(stage primarystage) {     textfield tf = new textfield();     label label = new label("your name: ");     button submit = new button("submit");     gridpane root = new gridpane();     label.setlabelfor(tf);      root.addrow(0, label, tf);     root.add(submit, 1, 1);     root.setpadding(new insets(10));     root.setvgap(5);     root.sethgap(5);      atomicboolean done = new atomicboolean(false);      executorservice = executors.newscheduledthreadpool(1);      // schedule timeout execution in 10 sec     scheduledfuture future = executorservice.schedule(() -> {         if (!done.getandset(true)) {             system.out.println("timeout");             platform.runlater(() -> {                 root.setdisable(true);             });         }     }, 10, timeunit.seconds);      submit.setonaction((actionevent event) -> {         if (!done.getandset(true)) {             // print result , stop timeout task             future.cancel(false);             system.out.println("your name " + tf.gettext());         }     });      scene scene = new scene(root);      primarystage.setscene(scene);     primarystage.show(); }  @override public void stop() throws exception {     executorservice.shutdown(); } 

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if want show time in ui, timeline may more suitable scheduledexecutorservice however:

@override public void start(stage primarystage) {     textfield tf = new textfield();     label label = new label("your name:");     button submit = new button("submit");     gridpane root = new gridpane();     label.setlabelfor(tf);      label time = new label("time:");     progressbar bar = new progressbar();     time.setlabelfor(bar);      root.addrow(0, time, bar);     root.addrow(1, label, tf);     root.add(submit, 1, 2);     root.setpadding(new insets(10));     root.setvgap(5);     root.sethgap(5);      timeline timeline = new timeline(             new keyframe(duration.zero, new keyvalue(bar.progressproperty(), 0)),             new keyframe(duration.seconds(10), evt -> {                 // execute @ end of animation                 system.out.println("timeout");                 root.setdisable(true);             }, new keyvalue(bar.progressproperty(), 1))     );     timeline.play();      submit.setonaction((actionevent event) -> {         // stop animation         timeline.pause();         system.out.println("your name " + tf.gettext());     });      scene scene = new scene(root);      primarystage.setscene(scene);     primarystage.show(); }