如何在Vaadin中的RichTextArea中添加TextChangeListener

Question

TextField searchField = new TextField();
searchField.addTextChangeListener(new TextChangeListener() {
    @Override
    public void textChange(TextChangeEvent event) {
        updateCharecterLeft();
    }
});

我想要一个RichTextArea而不是searchField。但RichTextArea没有addTextChangeListener。请帮忙

Answer 1

RichTextArea改为使用addValueChangeListener（）方法，该方法继承自AbstractField。

RichTextArea richTextArea = new RichTextArea();
    richTextArea.addValueChangeListener(new Property.ValueChangeListener() {
        @Override
        public void valueChange(Property.ValueChangeEvent valueChangeEvent) {
            updateCharecterLeft();
        }
    });

Answer 2

试试这个：

textArea.setImmediate(true);
textArea.setTextChangeEventMode(TextChangeEventMode.EAGER);
textArea.addTextChangeListener(new TextChangeListener(){

        @Override
        public void textChange(TextChangeEvent event) {
            // use event.getText() 
        }       
});