JLabel disappears when using html
Question
I have a JLabel that is going to have a lot of text in it so I need to add new lines to it. I found out that in order to do this you need to use html in your JLabel and <br> for a new line. Well, as soon as I add HTML to my JLabel it disappears!!
Here is a picture of the JLabel with the following code:
instructionLabel = new JLabel("lol");
instructionLabel.setBounds(25,10,500,100);
add(instructionLabel);
Now, when I change the code, as soon as I add html, it disappears:
instructionLabel = new JLabel("<html>lol</html>");
instructionLabel.setBounds(25,10,500,100);
add(instructionLabel);
The program gives no errors & I am willing to provide more code if necessary.
2 answers
solution1
2 2016-01-12 04:47:17
Avoid using null layouts, pixel perfect layouts are an illusion within modern ui design. There are too many factors which affect the individual size of components, none of which you can control. Swing was designed to work with layout managers at the core, discarding these will lead to no end of issues and problems that you will spend more and more time trying to rectify
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class LabelExample {
public static void main(String[] args) {
new LabelExample();
}
public LabelExample() {
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);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
add(new JLabel("Look ma, no html"));
add(new JLabel("<html>Look ma, html</html>"));
}
}
}
See Laying Out Components Within a Container for more details
Based on this requirement...
I did a simple GridBagLayout and produced this...
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.LineBorder;
public class LabelExample {
public static void main(String[] args) {
new LabelExample();
}
public LabelExample() {
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);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
JLabel points = new JLabel("<html><b>Points: 0</b></html>");
JLabel highscore = new JLabel("<html><b>Highscore: 0</b></html>");
JLabel score = new JLabel("97");
score.setFont(score.getFont().deriveFont(Font.BOLD, 96));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
add(points, gbc);
gbc.gridx = 2;
add(highscore, gbc);
gbc.weightx = 0;
gbc.weighty = 1;
gbc.gridx = 1;
gbc.anchor = GridBagConstraints.CENTER;
gbc.gridy++;
gbc.ipadx = 50;
gbc.ipady = 50;
score.setHorizontalAlignment(JLabel.CENTER);
add(score, gbc);
JButton high = new JButton("High");
JButton low = new JButton("Low");
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 2;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(high, gbc);
gbc.gridx = 2;
add(low, gbc);
}
}
}
This is just a rough start to provide a basic example of the idea
solution2
0 2016-01-17 21:22:18
// You can try below code to solve your problem.
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Font;
public class Tutorial extends JFrame {
public static void main(String[] args) {
new Tutorial();
}
public Tutorial() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
getContentPane().setLayout(null);
JLabel instructionLabel = new JLabel("<html><p>lol <br> Working</p></html>");
instructionLabel.setFont(new Font("Tahoma", Font.BOLD, 12));
instructionLabel.setBounds(25,10,500,100);
getContentPane().add(instructionLabel);
setVisible(true);
}
}
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