我试图要求关注第一个用户名字段,但是它不关注文本字段。这是我的代码:
JTextField username = new JTextField();
JTextField password = new JPasswordField();
JTextField prefix = new JTextField();
username.requestFocus();
Object[] message = {
"Username:", username,
"Password:", password,
"Prefix:", prefix
};
int option = JOptionPane.showConfirmDialog(null, message, "Login", JOptionPane.OK_CANCEL_OPTION);
username.requestFocus();
if (option == JOptionPane.OK_OPTION) {
return ls.login(username.getText(), password.getText(), prefix.getText());
} else {
return false;
}
如何请求用户名文本字段的焦点?
最佳答案
这是怎么做的:
final JTextField username = new JTextField();
JTextField password = new JPasswordField();
JTextField prefix = new JTextField();
JPanel gridLayout = new JPanel(new GridLayout(6, 1));
gridLayout.add(new JLabel("Username:"));
gridLayout.add(username);
gridLayout.add(new JLabel("Password:"));
gridLayout.add(password);
gridLayout.add(new JLabel("Prefix:"));
gridLayout.add(prefix);
username.addAncestorListener(new AncestorListener() {
@Override
public void ancestorRemoved(AncestorEvent pEvent) {
}
@Override
public void ancestorMoved(AncestorEvent pEvent) {
}
@Override
public void ancestorAdded(AncestorEvent pEvent) {
// TextField is added to its parent => request focus in Event Dispatch Thread
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
username.requestFocusInWindow();
}
});
}
});
int option = JOptionPane.showConfirmDialog(null, gridLayout, "Login",
JOptionPane.OK_CANCEL_OPTION);
我只是用
Object[] message
对象替换了JPanel
,并在文本字段添加到其父级时使用了AncestorListener
来得到通知。注意:我不知道为什么它不适用于您的
Object[] message
。