Listen to if a button is disabled or enabled in JavaFX -

i want code allows me listen changes made on textfield component disabling or enabling button called save. possible using bindings or similar?

for example: save.disableproperty().bind(...) used 2 textfield components changing information stored in tableview.
used data binding when tableview row selected, information in row displayed in textfield.

@fxml private tableview<userdata> table; @fxml private tablecolumn<userdata, string> col1; @fxml private tablecolumn<userdata, string> col2; @fxml private textfield name; @fxml private textfield email;  @fxml button newuser; @fxml button save; @fxml button delete; private connection conn; private statement stm; private preparedstatement prep; private resultset result;  /**  * initializes controller class.  */ @override public void initialize(url url, resourcebundle rb) {     populatetableview();     configuredisable();     table.getselectionmodel().selecteditemproperty().addlistener(userdatalistener);     name.disableproperty().bind(table.getselectionmodel().selecteditemproperty().isnull());     email.disableproperty().bind(table.getselectionmodel().selecteditemproperty().isnull());     delete.disableproperty().bind(table.getselectionmodel().selecteditemproperty().isnull());     data.addlistener((change<? extends userdata> change) -> save.setdisable(false));     name.setonaction(ev -> email.requestfocus()); }  private final changelistener<userdata> userdatalistener = ((v, oldv, newv) -> {     if (oldv != null) {         name.textproperty().unbindbidirectional(oldv.nameproperty());         email.textproperty().unbindbidirectional(oldv.emailproperty());      }     if (newv != null) {         name.textproperty().bindbidirectional(newv.nameproperty());         email.textproperty().bindbidirectional(newv.emailproperty());      }     private void populatetableview() {         try {             conn = createconnection.getconnection();             stm = conn.createstatement();             data = fxcollections.observablearraylist();             result = conn.createstatement().executequery("select *from user");             while (result.next()) {                 data.add(new userdata(result.getstring("name"), result.getstring("email")));             }             col1.setcellvaluefactory(new propertyvaluefactory<userdata, string>("name"));             col2.setcellvaluefactory(new propertyvaluefactory<userdata, string>("email"));             table.setitems(data);         } catch (ioexception ex) {             logger.getlogger(fxmlcontroller.class.getname()).log(level.severe, null, ex);         } catch (sqlexception ex) {             logger.getlogger(fxmlcontroller.class.getname()).log(level.severe, null, ex);         }     } }); 

if understand correctly, using text fields change data in table (specifically here name , email properties), , when values in table changed want enable save button.

you need listeners (rather bindings) this. 1 way create observablelist table items has extractor extract properties of interest. when list changes (including properties list elements), set disable property of save button false.

something like:

    observablelist<userdata> observabledata = fxcollections.observablelist(table.getitems(),              user -> new observable[] {user.nameproperty(),  user.emailproperty()});     observabledata.addlistener((change<? extends person> change) -> save.setdisable(false));