JavaFX TextField文本验证 [英] JavaFX TextField text validation

问题描述

我在我的字段上应用了侦听器：

I have a listener applied to my field:

nameTextField.addEventHandler(KeyEvent.KEY_TYPED, fieldChangeListener(50));

事件处理程序：

private EventHandler<KeyEvent> fieldChangeListener(final Integer max_Lengh) {
        return new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {
                TextField field = (TextField) event.getSource();
                String text = field.getText();
                // I need here something like:
                if(KeyEvent.VK_ENTER){
                // do special part for ENTER KEY
                }
            }
         }
}

问题是 KeyEvent事件来自 javafx.scene.input.KeyEvent 和 KeyEvent.VK_ENTER 来自 com.sun .glass.events.KeyEvent 。我不知道如何确定ENTER键是否触发了 KEY_TYPED 事件。

Problem is KeyEvent event is from javafx.scene.input.KeyEvent and KeyEvent.VK_ENTER from com.sun.glass.events.KeyEvent. I don't know how can I determine if ENTER key triggered KEY_TYPED event.

推荐答案

如果要在更改文本时进行输入验证，可以在 TextField textProperty 上使用侦听器c $ c>：

If you want to do input validation when the text is changing, you could use a listener on the textProperty of the TextField:

textField.textProperty().addListener((observable, oldValue, newValue) ->
    System.out.println("Input Validation"));

要检测何时按下 Enter ，可以使用 onActionProperty

To detect when Enter is pressed, you can use the onActionProperty

textField.setOnAction(event -> System.out.println("Enter pressed: Word Check"));

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如果要防止用户输入字符失败了验证逻辑，然后可以使用 TextFormatter （而不是听textProperty˙）（此 TextField 仅接受整数）：

---

If you want to prevent the user to input characters that fails the validation logic, then rather than listening to the textProperty˙, you can use a TextFormatter (this TextField only accept integers):

textField.setTextFormatter(new TextFormatter<>(change ->
         (change.getControlNewText().matches("([1-9][0-9]*)?")) ? change : null));

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