我试过import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Controller manager = new Controller() {
@Override
public void show(JPanel pane) {
frame.getContentPane().removeAll();
frame.getContentPane().add(pane);
frame.getContentPane().revalidate();
frame.getContentPane().repaint();
}
};
JMenuBar menuBar = new JMenuBar();
JMenu options = new JMenu("Options");
menuBar.add(options);
options.add(new SomeOptionsAction(manager));
options.add(new SomeOtherOptionsAction(manager));
frame.setJMenuBar(menuBar);
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public interface Controller {
public void show(JPanel pane);
}
public abstract class AbstractManagerAction extends AbstractAction {
private Controller controller;
private JPanel panel;
public AbstractManagerAction(Controller controller, JPanel panel) {
this.controller = controller;
this.panel = panel;
}
@Override
public void actionPerformed(ActionEvent e) {
controller.show(panel);
}
}
public class SomeOptionsAction extends AbstractManagerAction {
public SomeOptionsAction(Controller controller) {
super(controller, new SomeOptionsPane());
putValue(NAME, "Some options");
}
}
public class SomeOptionsPane extends JPanel {
public SomeOptionsPane() {
setLayout(new GridBagLayout());
add(new JLabel("Some options"));
}
}
public class SomeOtherOptionsAction extends AbstractManagerAction {
public SomeOtherOptionsAction(Controller manager) {
super(manager, new SomeOtherOptionsPane());
putValue(NAME, "Some other options");
}
}
public class SomeOtherOptionsPane extends JPanel {
public SomeOtherOptionsPane() {
setLayout(new GridBagLayout());
add(new JLabel("Some other options"));
}
}
}
，然后将TD的颜色设置为红色：
<%= f.select :document_id, entry.documents, include_blank: true %>
但发生了这种情况
object.qtdItem == 0答案 0 :(得分：0)
三元语句需要else条款，例如
<td th:style="${obj.qtdItem == 0 ? 'color: red;' : 'color: some_other_color;'}}" th:text="${obj.text}"></td>
答案 1 :(得分：0)
另一种选择：
th:style="${obj.qtdItem == 0} ? ${'color: red;'}"
答案 2 :(得分：0)
这对我有用。
th:style="|${obj.qtdItem == 'red' ? 'color: red;' : 'color: green;'}|"