JavaFX 2.2 文本字段最大长度 [英] JavaFX 2.2 TextField maxlength

问题描述

我正在处理 JavaFX 2.2 项目，但在使用 TextField 控件时遇到问题.我想限制用户能够输入每个 TextField 的字符数.但是我找不到属性或类似 maxlength 的东西.Swing 中存在同样的问题并已解决 这个 方式.JavaFX 2.2如何解决?

I am working on a JavaFX 2.2 project and I have a problem using the TextField control. I want to limit the number of characters that a user will be able to enter into each TextField. However I can't find a property or something like maxlength. The same problem existed in Swing and was solved this way. How to solve it for JavaFX 2.2?

推荐答案

这是处理通用文本字段的更好方法:

This is a better way to do the job on a generic text field:

public static void addTextLimiter(final TextField tf, final int maxLength) {
    tf.textProperty().addListener(new ChangeListener<String>() {
        @Override
        public void changed(final ObservableValue<? extends String> ov, final String oldValue, final String newValue) {
            if (tf.getText().length() > maxLength) {
                String s = tf.getText().substring(0, maxLength);
                tf.setText(s);
            }
        }
    });
}

工作完美，除了那个撤消错误.

Works perfectly, except for that Undo bug.

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