How do I pick up the Enter Key being pressed in Ja

问题:

I have a TextField to enter a search term, and a button for "Go". But in JavaFX2, how would I make it so pressing the Enter Key in the TextField would perform an action?

Thanks :)

回答1:

You can use the onAction attribute of the TextField and bind it to a method in your controller.

@FXML
public void onEnter(ActionEvent ae){
   System.out.println("test") ;
}

And in your FXML file:

<TextField fx:id="textfield" layoutX="29.0" layoutY="298.0" onAction="#onEnter" prefWidth="121.0" />

回答2:

I'm assuming you want this to happen when the user presses enter only while the TextField has focus. You'll want use KeyEvent out of javafx.scene.input and do something like this...

textField.setOnKeyPressed(new EventHandler<KeyEvent>()
    {
        @Override
        public void handle(KeyEvent ke)
        {
            if (ke.getCode().equals(KeyCode.ENTER))
            {
                doSomething();
            }
        }
    });

Hope this is helpful!

回答3:

You can try the following:

@FXML
public void buttonPressed(KeyEvent e)
{
    if(e.getCode().toString().equals("ENTER"))
    {
        //do something
    }
}

回答4:

Simply using "lambda expression" :

TextField textField = new TextField();
textField.setOnAction(e -> {
    // add your code to be run here
    System.out.println("textFile");
    });

回答5:

This works:

@FXML public TextField txt;

@FXML
public void textAction(KeyEvent e){

    if(e.getCode().equals(KeyCode.ENTER))
        System.out.println(txt.getText());
}

If for some reason .getCode() is not working, make sure you import the library:

import javafx.scene.input.KeyEvent;

NOT

import java.awt.event.KeyEvent;

I got caught up on this and it was irritating. Im just passing this on for all those in the same boat.

回答6:

On some keyboards you have to put additional tests to the '\n' and '\r' characters.

if(event.getCode().equals(KeyCode.ENTER) || event.getCharacter().getBytes()[0] == '\n' || event.getCharacter().getBytes()[0] == '\r') {
        // your action
    }