AssignToBoundException

Question

It's probably me not getting all the subtilities of data binding, but isn't the example underneath supposed to work without errors ?
Enter some text in the first text field and navigate to the second. The exception is thrown when the focus leaves the first text field.
Btw, changing the variable "entry" into a "def" yields the same error.
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.TextBox;
import javafx.scene.layout.VBox;
class StackEntry {
    var title:String;
    var notes:String;
var entry = StackEntry{};
Stage {
    title: "Binding Test"
    width: 250
    height: 100
    scene: Scene {
        content: [
            VBox {
                spacing: 5
                content: [
                        TextBox {
                            text: bind entry.title
                        TextBox {
                            text: bind entry.notes
}Edited by: Java.Artisan on Jun 24, 2009 4:17 AM

Answer 1

This makes it a somewhat "less boilerplaty". If someone knows a shortcut...
import javafx.scene.control.TextBox;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.KeyCode;
public class ATextBox extends TextBox {
    var originalKeyReleased:function( event:KeyEvent );
    public-init var onChange:function( value:String );
    // the value should be send when the control loses focus
    override public-read var focused on replace {
        // if the control loses focus => send the value
        if ( not focused ) {
            if ( onChange != null ) {
                onChange( text );
    postinit {
        // keep a reference to the original key listener
        originalKeyReleased = this.onKeyReleased;
        // put our implementation in place
        this.onKeyReleased = interceptKey;
    function interceptKey( event:KeyEvent ) {
        if ( onChange != null ) {
            // if the user pressed enter or tab => send the value
            if ( event.code == KeyCode.VK_TAB or event.code == KeyCode.VK_ENTER )
                onChange( text );
        // execute the original listener - if precified
        if ( originalKeyReleased != null ) {
            originalKeyReleased( event );
}