JavaFX Button which adds and removes Checkboxes - javafx

Question

I was trying to create a button which deletes checked CheckBox but don't know how to make "cb" the same as in the Adding button.
package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
public class Controller {
#FXML
private Button add;
#FXML
private Button delete;
#FXML
private VBox vbox;
#FXML
private TextField text;
#FXML
private CheckBox cb;
#FXML
void initialize() {
}
#FXML
public void onAdd(ActionEvent e) {
CheckBox cb = new CheckBox(text.getText());
vbox.getChildren().add(cb);
if (text.getText().matches("")) {
vbox.getChildren().remove(cb);
}
}
#FXML
public void onDelete(ActionEvent e) {
if(cb.isSelected()){
vbox.getChildren().remove(cb);
}
}
}
The "cb" in onAdd event isn't the same as in onDelete event. How can i solve it ?

Answer 1

Note that it's possible to add multiple CheckBoxes with the code you've posted. It's unclear which one should be removed. Of course you can access the children the way you access any other list elements. You deed to add a cast of course, since children is a List<Node>. If all children of vbox are CheckBoxes, you could simply iterate through all the children and remove all those CheckBoxes that are selected (assuming this is the functionality you're trying to achieve).
vbox.getChildren().removeIf(child -> ((CheckBox) child).isSelected());
If this is not the case, you could store the elements in a List<CheckBox> field:
private final List<CheckBox> checkBoxes = new ArrayList<>();
#FXML
public void onAdd(ActionEvent e) {
if (text.getText().isEmpty()) { // alternative: text.getText().equals(""); matches is for regular expressions
CheckBox cb = new CheckBox(text.getText());
vbox.getChildren().add(cb);
checkBoxes.add(cb);
}
}
#FXML
public void onDelete(ActionEvent e) {
Iterator<CheckBox> iter = checkBoxes.iterator();
while (iter.hasNext()) {
CheckBox cb = iter.next();
if (cb.isSelected()) {
// remove from both vbox and checkBoxes
vbox.getChildren().remove(cb);
iter.remove();
}
}
}