确定按下按钮的 fx:id

Question

I am trying to set up a method used by three different buttons. I want to load one of three different views depending on which of them is pressed. To do so, I thought about passing as an argument the button itself. But I was unable, due to javaFX not recognising the method with the new argument.

How can I get the fx:id of the caller button so I can make the distinction between each of them? Here's what I got this far. I just need to initialize pressed variable so it will do its thing.

if (pressed == edgeModify){
    loader = new FXMLLoader(getClass().getResource("/digitalia/view/edgeView.fxml"));
} else if (pressed == sectionModify){
    loader = new FXMLLoader(getClass().getResource("/digitalia/view/sectionView.fxml"));
} else {
    loader = new FXMLLoader(getClass().getResource("/digitalia/view/LayerView.fxml"));
}

Answer 1

You can get the id of the button as below:

Button btn = (Button) event.getSource();
String id = btn.getId();

An easier approach would just be to use different handlers for the buttons.

Answer 2

Use a different handler for each button. It looks like this would be as simple as:

@FXML
private void loadEdgeView(ActionEvent event) {
    load("edgeView");
}

@FXML
private void loadSectionView(ActionEvent event) {
    load("sectionView");
}

@FXML
private void loadLayerView(ActionEvent event) {
    load("layerView");
}

private void load(String view) {
    FXMLLoader loader = new FXMLLoader("/digitalia/view/" + view + ".fxml");
    // ...
}

---

If you really want to do this with a single method, you could leverage the userData of the button; ie:

<Button text="Load Edge View" onAction="#loadView" userData="edgeView" />
<Button text="Load Section View" onAction="#loadView" userData="sectionView" />
<Button text="Load Layer View" onAction="#loadView" userData="layerView" />

and then in the controller:

@FXML
private void loadView(ActionEvent event) {
    Node node = (Node) event.getSource();
    String view = (String) node.getUserData();
    FXMLLoader loader = new FXMLLoader("/digitalia/view/" + view + ".fxml");
    // ...
}

I think using separate handlers is more maintainable, for a small price in verbosity.

Answer 3

You can use the source of the event object like this:

button.setOnAction(e -> {if (e.getSource() == button) System.out.println("button was pressed.");});

In your above example you only have to exchange pressed with e.getSource() .

Answer 4

@FXML void handleButtonAction(ActionEvent event) {
        Expression e = new Expression("");

        String eventString = event.toString();
        System.out.println(eventString);
        String[] cutAtId = eventString.split("id=");
        cutAtId = cutAtId[1].split(", ");
        eventString = cutAtId[0];
        System.out.println("eventString ===>>>" + eventString + "<<<<====");
}