Databases
StackOverflow2013
Postsdbo
POWhy don't events work in my applet? (they work in the original application)
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhy don't events work in my applet? (they work in the original application)
    primarykey
    data
    text
    <p>My applet is basically two combo boxes that store values in variables with their events (when the user selects an option). The confirm button generates an event that adds those two values together. The appliction works fine, but when I try to convert it into an applet, the text field doesn't show up, and there seems to be some warning sign that comes whenever I click a combo option Any advice please?</p> <p>Here is the code for the applet:</p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; public class DormPlanApplet extends JApplet { private JPanel selectionPanel; private JPanel costPanel; private JComboBox dormListBox; private JComboBox mealPlanListBox; private JLabel costLabel; private JTextField costField; private JButton confirmButton; double dormCost; double mealCost; double totalCost; int checker1; int checker2; String costString; private String[] dormListArray = {"Allen Hall", "Pike Hall", "Farthing Hall", "University Suites" }; private String[] mealPlanListArray = {"7 Meals", "14 Meals", "Unlimited Meals" }; public void init() { //super("College Cost Calculator"); //setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLayout(new BorderLayout()); buildSelectionPanel(); buildCostPanel(); add(selectionPanel, BorderLayout.CENTER); add(costPanel, BorderLayout.SOUTH); //pack(); //setVisible(true); } private void buildSelectionPanel() { selectionPanel = new JPanel(); selectionPanel.setLayout(new FlowLayout()); dormListBox = new JComboBox(dormListArray); mealPlanListBox = new JComboBox(mealPlanListArray); dormListBox.addActionListener(new dormCostListener()); mealPlanListBox.addActionListener(new mealCostListener()); selectionPanel.add(dormListBox); selectionPanel.add(mealPlanListBox); } private void buildCostPanel() { costPanel = new JPanel(); costPanel.setLayout(new FlowLayout()); costLabel = new JLabel("The total cost is:"); confirmButton = new JButton("Confirm"); confirmButton.addActionListener(new calcButtonListener()); costField = new JTextField(12); costField.setEditable(false); costPanel.add(confirmButton); costPanel.add(costLabel); costPanel.add(costField); } private class dormCostListener implements ActionListener { public void actionPerformed(ActionEvent e) { checker1 = 1; switch (dormListBox.getSelectedIndex()) { case 0: dormCost = 1500; break; case 1: dormCost = 1600; break; case 2: dormCost = 1200; break; case 3: dormCost = 1800; break; default: dormCost = 0; break; } } } private class mealCostListener implements ActionListener { public void actionPerformed(ActionEvent e) { checker2 = 1; switch (mealPlanListBox.getSelectedIndex()) { case 0: mealCost = 560; break; case 1: mealCost = 1095; break; case 2: mealCost = 1500; break; default: mealCost = 0; break; } } } private class calcButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { if ((checker1 == 1) &amp;&amp; (checker2 == 1)) { totalCost = dormCost + mealCost; costString = Double.toString(totalCost); costField.setText(costString); } else { costField.setText("It doesn't work!"); } } } } </code></pre> <p>Here is the code for the oringal appliction:</p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; public class DormPlanApp extends JFrame { private JPanel selectionPanel; private JPanel costPanel; private JComboBox dormListBox; private JComboBox mealPlanListBox; private JLabel costLabel; private JTextField costField; private JButton confirmButton; double dormCost; double mealCost; double totalCost; int checker1; int checker2; String costString; private String[] dormListArray = {"Allen Hall", "Pike Hall", "Farthing Hall", "University Suites" }; private String[] mealPlanListArray = {"7 Meals", "14 Meals", "Unlimited Meals" }; public DormPlanApp() { super("College Cost Calculator"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLayout(new BorderLayout()); buildSelectionPanel(); buildCostPanel(); add(selectionPanel, BorderLayout.CENTER); add(costPanel, BorderLayout.SOUTH); pack(); setVisible(true); } private void buildSelectionPanel() { selectionPanel = new JPanel(); selectionPanel.setLayout(new FlowLayout()); dormListBox = new JComboBox(dormListArray); mealPlanListBox = new JComboBox(mealPlanListArray); dormListBox.addActionListener(new dormCostListener()); mealPlanListBox.addActionListener(new mealCostListener()); selectionPanel.add(dormListBox); selectionPanel.add(mealPlanListBox); } private void buildCostPanel() { costPanel = new JPanel(); costPanel.setLayout(new FlowLayout()); costLabel = new JLabel("The total cost is:"); confirmButton = new JButton("Confirm"); confirmButton.addActionListener(new calcButtonListener()); costField = new JTextField(12); costField.setEditable(false); costPanel.add(confirmButton); costPanel.add(costLabel); costPanel.add(costField); } private class dormCostListener implements ActionListener { public void actionPerformed(ActionEvent e) { checker1 = 1; switch (dormListBox.getSelectedIndex()) { case 0: dormCost = 1500; break; case 1: dormCost = 1600; break; case 2: dormCost = 1200; break; case 3: dormCost = 1800; break; default: dormCost = 0; break; } } } private class mealCostListener implements ActionListener { public void actionPerformed(ActionEvent e) { checker2 = 1; switch (mealPlanListBox.getSelectedIndex()) { case 0: mealCost = 560; break; case 1: mealCost = 1095; break; case 2: mealCost = 1500; break; default: mealCost = 0; break; } } } private class calcButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { if ((checker1 == 1) &amp;&amp; (checker2 == 1)) { totalCost = dormCost + mealCost; costString = Double.toString(totalCost); costField.setText(costString); } else { costField.setText("It doesn't work!"); } } } public static void main(String[] args) { new DormPlanApp(); } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USJohnny
    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
    1. This table or related slice is empty.
    1. CO*"the text field doesn't show up"* It does here. *"there seems to be some warning sign that comes whenever I click a combo option"* DYM a little yellow triangle floating near the combo?
      singulars
      1. POWhy don't events work in my applet? (they work in the original application)
      1. USAndrew Thompson
    2. COYeah, that's what I mean---the little yellow triangle.
      singulars
      1. POWhy don't events work in my applet? (they work in the original application)
      1. USJohnny
    3. COThe yellow triangle is normal for any floating element (e.g. the drop-down of the combo-box) if it leaves the area of the applet. It will disappear if the applet is trusted, or the combo is moved 'up' the applet (so the drop-down is still within the applet bounds).
      singulars
      1. POWhy don't events work in my applet? (they work in the original application)
      1. USAndrew Thompson
 

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