How to make an input form in Java code (not Netbeans using JForm)?
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02-10-2019 - |
Question
I want to make an input form in Java so that the user can enter details.
Something like this:
My code
import java.awt.GridLayout;
import javax.swing.*;
class JOptionPaneTest {
public static void main(String[] args) {
String[] items = {"One", "Two", "Three", "Four", "Five"};
JComboBox combo = new JComboBox(items);
JTextField field1 = new JTextField("1234.56");
JTextField field2 = new JTextField("9876.54");
JPanel panel = new JPanel(new GridLayout(0, 1));
panel.add(combo);
panel.add(new JLabel("Field 1:"));
panel.add(field1);
panel.add(new JLabel("Field 2:"));
panel.add(field2);
int result = JOptionPane.showConfirmDialog(null, panel, "Test",
JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
if (result == JOptionPane.OK_OPTION) {
System.out.println(combo.getSelectedItem()
+ " " + field1.getText()
+ " " + field2.getText());
} else {
System.out.println("Cancelled");
}
}
}
My output form:
I think I must change my layout to something like BorderLayout
. Any ideas how to get the look of the form at the top of the question?
Solution
Yes, you have to change layout. Have a look at SpringLayout and this example:
(source: sun.com)
String[] labels = {"Name: ", "Fax: ", "Email: ", "Address: "};
int numPairs = labels.length;
//Create and populate the panel.
JPanel p = new JPanel(new SpringLayout());
for (int i = 0; i < numPairs; i++) {
JLabel l = new JLabel(labels[i], JLabel.TRAILING);
p.add(l);
JTextField textField = new JTextField(10);
l.setLabelFor(textField);
p.add(textField);
}
//Lay out the panel.
SpringUtilities.makeCompactGrid(p,
numPairs, 2, //rows, cols
6, 6, //initX, initY
6, 6); //xPad, yPad
SpringLayout works fine for this simple form, but there is third party libraries that has more features. I.e. MiG Layout.
OTHER TIPS
Another way to create a form using GridBagLayout, producing the following result:
Code:
JPanel addressPanel = new JPanel();
Border border = addressPanel.getBorder();
Border margin = new EmptyBorder(10, 10, 10, 10);
addressPanel.setBorder(new CompoundBorder(border, margin));
GridBagLayout panelGridBagLayout = new GridBagLayout();
panelGridBagLayout.columnWidths = new int[] { 86, 86, 0 };
panelGridBagLayout.rowHeights = new int[] { 20, 20, 20, 20, 20, 0 };
panelGridBagLayout.columnWeights = new double[] { 0.0, 1.0, Double.MIN_VALUE };
panelGridBagLayout.rowWeights = new double[] { 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE };
addressPanel.setLayout(panelGridBagLayout);
addLabelAndTextField("City:", 0, addressPanel);
addLabelAndTextField("Street:", 1, addressPanel);
addLabelAndTextField("State:", 2, addressPanel);
addLabelAndTextField("Phone:", 3, addressPanel);
addLabelAndTextField("Mail:", 4, addressPanel);
The helper method addLabelAndTextField
:
private void addLabelAndTextField(String labelText, int yPos, Container containingPanel) {
JLabel label = new JLabel(labelText);
GridBagConstraints gridBagConstraintForLabel = new GridBagConstraints();
gridBagConstraintForLabel.fill = GridBagConstraints.BOTH;
gridBagConstraintForLabel.insets = new Insets(0, 0, 5, 5);
gridBagConstraintForLabel.gridx = 0;
gridBagConstraintForLabel.gridy = yPos;
containingPanel.add(label, gridBagConstraintForLabel);
JTextField textField = new JTextField();
GridBagConstraints gridBagConstraintForTextField = new GridBagConstraints();
gridBagConstraintForTextField.fill = GridBagConstraints.BOTH;
gridBagConstraintForTextField.insets = new Insets(0, 0, 5, 0);
gridBagConstraintForTextField.gridx = 1;
gridBagConstraintForTextField.gridy = yPos;
containingPanel.add(textField, gridBagConstraintForTextField);
textField.setColumns(10);
}
You are currently using a GridLayout, which can be fine for your need.
However, you should initialize it with the actual number of rows and columns you will need. In your case:
new GridLayout(0, 2);
0 for rows means there is not limit, and you have 2 columns, one for the labels, and one for the input component. See the Java tutorial for more information on GridLayouts.
(source: sun.com)
Note however that the GridLayout will make all "cells" to be the same size, which can be a problem for the labels.
However, Jonas is right, a SpringLayout is probably more adapted to your need.
You can do this with DesignGridLayout. The following snippet should work (sorry I could not test it I am not on my dev station right now):
DesignGridLayout layout = new DesignGridLayout(panel);
layout.row().grid(streetAddressLabel).add(streetAddressField);
layout.row().grid(cityLabel).add(cityField);
layout.row().grid(stateLabel).add(stateSpinner);
layout.row().grid(zipLabel).add(zipField);
layout.emptyRow();
layout.row().right().add(setAddressButton, clearAddressButton);
Then you would use JDialog
(rather than JOptionPane
) to display your panel
.