Reloading a comboBox after changing it's values - javafx

Question

I am populating a comboBox with items taken from a sql database when initializing the thread.
If anyone's interested:
public void initialize(URL arg0, ResourceBundle arg1) {
if(arr != null || arr.length > 0) {
for(int i = 0; i<arr.length; i++) {
cmBox.getItems().add(arr[i]);
}
}
}
I have a part of my code that adds a new value to the sql table, and I want to re-populate the comboBox when that happens.
if I do:
cmBox.getItems().clear();
arr = sqld.selectAll();
if(arr != null || arr.length > 0) {
for(int i = 0; i<arr.length; i++) {
cmBox.getItems().add(arr[i]);
}
}
It works fine, but I can't see the new changes unless I close and re-open the window that displays the comboBox.
No errors or anything, just looking for creative ways of re-loading a comboBox and have it actually show the updated values without manually closing and re-opening the window.

Answer 1

You don't need a refresh button just run comboBox.setItems(...) when you add "a new value to the sql table" this should update the combo box here is an example
public class Main extends Application {
private int[] data;
private int dataCount = 0;
#Override
public void start(Stage primaryStage) throws Exception{
data = randomizeData(dataCount);
ComboBox comboBox = new ComboBox();
comboBox.setItems(FXCollections.observableArrayList(
Arrays.stream(data).boxed().collect(Collectors.toList())));
Button updateDataButton = new Button("Update values in SQL Table");
updateDataButton.setOnAction(event -> {
//Update your SQL data
updateData();
//Refresh List
comboBox.setItems(FXCollections.observableArrayList(
Arrays.stream(data).boxed().collect(Collectors.toList())));
});
VBox vBox = new VBox();
vBox.setAlignment(Pos.CENTER);
vBox.getChildren().addAll(comboBox, updateDataButton);
Scene scene = new Scene(vBox);
primaryStage.setScene(scene);
primaryStage.show();
}
private int[] randomizeData(int additional){
int[] data = new int[5+additional];
for (int i = 0; i < data.length; i++) {
data[i] = (int) (Math.random()*10);
}
return data;
}
private void updateData(){
data = randomizeData(++dataCount);
}
public static void main(String[] args) { launch(args); }
}