Use controls from another form/controller in JavaFX 8 -

i have javafx 8 application...

mainapp.java

    parent root;     root = fxmlloader.load(getclass().getresource("/fxml/mainform.fxml"));     scene scene = new scene(root);             stage.setscene(scene);     stage.show(); 

the mainform.fxml defines controller fx:controller="maincontroller" , controller contains text field textfieldusername.

@fxml protected textfield textfieldusername; 

then, there second form auxform.fxml controller fx:controller="auxcontroller". second form included in mainform.fxml this:

<content>   <fx:include source="auxform.fxml" /> </content> 

now need value of textfieldusername. value needed in second controller have no idea how this. first idea public class auxcontroller extends maincontroller have controls available doesn't work.

add fx:id fx:include:

<content>   <fx:include fx:id="auxform" source="auxform.fxml" /> </content> 

now can inject controller included fxml (the "nested controller") "main controller". assuming auxform.fxml has fx:controller="auxcontroller" can do:

public class maincontroller {      @fxml     private auxcontroller auxformcontroller ;       public void initialize() {         // call methods need on auxformcontroller ...          // ...     }      // ... } 

the rule here append word controller value of fx:id form field name "nested controller".

now can define methods need in auxcontroller (e.g. public string getusername() {...}) , invoke them main controller when need.

for example, if needed provide data auxcontroller, provide property there set or bind maincontroller:

public class auxcontroller {       private final stringproperty username ;      public stringproperty usernameproperty() {         return username ;     }      //... } 

then in main controller's initialize() method can do

auxformcontroller.usernameproperty().bind(     textfieldusername.textproperty()); 

now username.get() give text in text field.

see fxml documentation more details.