JavaFX 文本字段的值更改侦听器
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Value Change Listener for JavaFX's TextField
提问by Elyas Hadizadeh
I would like to add a kind of listenerto my JavaFX's TextFieldwhich when ever a user changes the value of the TextField, the Application prints something on the console.
我想listener向我添加一种JavaFX's TextField，当用户更改 的值时TextField，应用程序会在控制台上打印一些内容。
I've searched and i find the following very similar question : Value Change Listener to JTextField
我搜索过，发现以下非常相似的问题：Value Change Listener to JTextField
The answer of mentioned question is very clear and efficient, but unfortunately it is only useful for JTextField( Not JavaFX's TextField) because it says you should use DocumentListener like this:
上述问题的答案非常清晰有效，但不幸的是，它仅对JTextField( Not JavaFX's TextField)有用，因为它说您应该像这样使用 DocumentListener：
// Listen for changes in the text
textField.getDocument().addDocumentListener(new DocumentListener() {
public void changedUpdate(DocumentEvent e) {
warn();
}
public void removeUpdate(DocumentEvent e) {
warn();
}
public void insertUpdate(DocumentEvent e) {
warn();
}
but in JavaFX's TextFields you are not able to do it. So? What is the solution?
但是在 JavaFX 的 TextFields 中，您无法做到。所以？解决办法是什么？
(describing with code can be very good but if it is not possible, any hint will be appreciated)
（用代码描述可能非常好，但如果不可能，任何提示将不胜感激）
采纳答案by Roland
Add a listener to the TextField's textProperty:
为 TextField 的 textProperty 添加一个监听器：
TextField textField = new TextField();
textField.textProperty().addListener((observable, oldValue, newValue) -> {
System.out.println("textfield changed from " + oldValue + " to " + newValue);
});
