java - JavaFX binding between TextField and a property -

if create binding between javafx textfield , property, binding invalidated on every keystroke, causes change text.

if have chain of bindings default behavior cause problems, because in middle of editing values may not valid.

ok, know create uni-directional binding property textfield , register change listener informed when cursor leaves field , update property manually if necessary.

is there easy, elegant way change behavior binding invalidated when editing complete, e.g. when cursor leaves field?

thanks

i think you've pretty described way it. here's cleanest way can see implement (using java 8, though it's easy enough convert lambdas javafx 2.2 compatible if need):

import javafx.application.application; import javafx.beans.binding.bindings; import javafx.beans.binding.stringbinding; import javafx.event.actionevent; import javafx.scene.scene; import javafx.scene.control.textfield; import javafx.scene.layout.vbox; import javafx.stage.stage;      public class commitboundtextfield extends application {          @override         public void start(stage primarystage) {             textfield tf1 = new textfield();             createcommitbinding(tf1).addlistener((obs, oldtext, newtext) ->                  system.out.printf("text 1 changed \"%s\" \"%s\"%n", oldtext, newtext));             textfield tf2 = new textfield();             createcommitbinding(tf2).addlistener((obs, oldtext, newtext) ->                  system.out.printf("text 2 changed \"%s\" \"%s\"%n", oldtext, newtext));             vbox root = new vbox(5, tf1, tf2);             scene scene = new scene(root, 250, 100);             primarystage.setscene(scene);             primarystage.show();         }          private stringbinding createcommitbinding(textfield textfield) {             stringbinding binding = bindings.createstringbinding(() -> textfield.gettext());             textfield.addeventhandler(actionevent.action, evt -> binding.invalidate());             textfield.focusedproperty().addlistener((obs, wasfocused, isfocused)-> {                 if (! isfocused) binding.invalidate();             });             return binding ;         }          public static void main(string[] args) {             launch(args);         }     }