How to remove selected elements from a ComboBox - javafx

Question

When I select element from combobox, it must be remove from list of elements. And selected element mustn't be shown it must be deleted immediately.
When I select element from combobox, it must be remove from list of elements. And selected element mustn't be shown it must be deleted immediately.
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.layout.TilePane;
import javafx.stage.Stage;
public class Test extends Application {
// Launch the application
public void start(Stage stage)
{
// Set title for the stage
stage.setTitle("creating combo box ");
// Create a tile pane
TilePane r = new TilePane();
// Create a label
Label description_label =
new Label("This is a combo box example ");
// Weekdays
String week_days[] =
{ "Monday", "Tuesday", "Wednesday",
"Thrusday", "Friday" };
// Create a combo box
ComboBox combo_box =
new ComboBox(FXCollections
.observableArrayList(week_days));
// Label to display the selected menuitem
Label selected = new Label("default item selected");
// Create action event
EventHandler<ActionEvent> event =
new EventHandler<ActionEvent>() {
public void handle(ActionEvent e)
{
selected.setText(combo_box.getValue() + " selected");
}
};
// Set on action
combo_box.setOnAction(event);
// Create a tile pane
TilePane tile_pane = new TilePane(combo_box, selected);
// Create a scene
Scene scene = new Scene(tile_pane, 200, 200);
// Set the scene
stage.setScene(scene);
stage.show();
}
public static void main(String args[])
{
// Launch the application
launch(args);
}
}
Output:

Answer 1

Since onAction is invoked before ComboBox has properly dealt with updating itself, you need to delay the removal using Platform.runLater:
EventHandler<ActionEvent> event = new EventHandler<ActionEvent>() {
public void handle(ActionEvent e) {
String value = combo_box.getValue();
if (value != null) {
selected.setText(value + " selected");
Platform.runLater(() -> {
combo_box.setValue(null);
combo_box.getItems().remove(value);
});
}
}
};