Databases
StackOverflow2013
Postsdbo
POWhy does using ActionListener break my Swing Applet?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhy does using ActionListener break my Swing Applet?
    primarykey
    data
    text
    <p>I have an application working in Java Swing, but can't seem to convert to an Applet. Basically there are four buttons displayed on the Applet, and I want one of them to clear the screen and then draw a new interface (I'm going to add stuff for the other buttons, of course, but I got stuck here).</p> <pre class="lang-java prettyprint-override"><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.JApplet; //import swing applet interface import java.util.Hashtable; public class TopMenu extends JApplet{ private JPanel panel = new JPanel(); public void init(){ mainMenu(); } public void mainMenu() { // create buttons panel.setLayout(new GridLayout(2, 2)); JButton collectButton = new JButton("Collect data"); JButton uploadButton = new JButton("Upload"); JButton downloadButton = new JButton("Download"); JButton exploreButton = new JButton("Explore data"); panel.add(collectButton); panel.add(uploadButton); panel.add(downloadButton); panel.add(exploreButton); collectButton.addActionListener(new ActionListener( ) { public void actionPerformed(ActionEvent e) { int numberGFish = 400; //panel.removeAll(); //panel.add(new JLabel("Just to test"), BorderLayout.CENTER); //panel.revalidate(); //panel.repaint(); } }); setContentPane(panel); } } </code></pre> <p>All the code works totally fine until I add the ActionListener, and then the whole thing just goes blank. It compiles okay, but when I test it on my server not even the first menu comes up, it's just a blank panel. I've tried putting loads of really banal things in the ActionListener bit to make sure it's not a problem with them, but as you can see even just declaring a number in there doesn't work.</p> <p>Originally I actually had the Listener bit call on another method which then did everything else, and that didn't work either, I scrapped that because I thought perhaps that was the problem.</p> <p>I'm sure this is so simple but I've sunk many hours into it now and I've really just run out of ideas of things to test. And advice gratefully appreciated.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USChris Beeley
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COWorks totally fine for me. I used the exact code you posted, even using the commented code, and the button works fine.
      singulars
      1. POWhy does using ActionListener break my Swing Applet?
      1. USPaul Samsotha
    2. COTry in a browser...
      singulars
      1. POWhy does using ActionListener break my Swing Applet?
      1. USAPerson
    3. COOh gosh how strange. I'm hosting it on my server here http://chrisbeeley.net/website/java-demo.html It's an Ubuntu 12.04 LTS server and I'm using Chrome on Linux Mint to test it. As I say it renders fine with the ActionListener removed, but is blank with it added. How weird that my code actually works. Thanks for letting me know, I'll try it on another browser. If anybody does click the link I'd be very grateful to know if it works
      singulars
      1. POWhy does using ActionListener break my Swing Applet?
      1. USChris Beeley
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload