java documentlistener [英] java documentlistener

问题描述

我试图在更改JTextField的文本后调用方法.

I'm trying to call method after changing text of JTextField.

textField.getDocument().addDocumentListener(new DocumentListener()
        {

            public void changedUpdate(DocumentEvent arg0) 
            {
                System.out.println("IT WORKS");
                panel.setPrice(panel.countTotalPrice(TabPanel.this));
            }
            public void insertUpdate(DocumentEvent arg0) 
            {

            }

            public void removeUpdate(DocumentEvent arg0) 
            {

            }
        });

当我在另一个ActionListener上调用此方法时，它可以正常工作.但是，当我在文本字段中更改文本时，什么也没有发生.甚至println.有什么建议吗?

When I call this method at another ActionListener, it works ok. But when I change text in text field, nothing happens. Even println. Any suggestions?

推荐答案

问题已解决.仅在其他属性(字体，大小，但未更改文本)更改时才调用changedUpdated方法.要在每次更改文本后调用方法，我应该将调用放入insertUpdate和removeUpdate方法中.这样:

The problem solved. changedUpdated method called only when other atributes (font, size, but not text) changed. To call method after every change of text, I should put the call into insertUpdate and removeUpdate methods. This way:

textField.getDocument().addDocumentListener(new DocumentListener()
        {

            public void changedUpdate(DocumentEvent arg0) 
            {

            }
            public void insertUpdate(DocumentEvent arg0) 
            {
                System.out.println("IT WORKS");
                panel.setPrice(panel.countTotalPrice(TabPanel.this));
            }

            public void removeUpdate(DocumentEvent arg0) 
            {
                System.out.println("IT WORKS");
                panel.setPrice(panel.countTotalPrice(TabPanel.this));
            }
        });

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