Get the return value of JOptionPane

Question

My JOptionPane code is as follows:

selectedSiteName = JOptionPane.showInputDialog("Enter the name of the new site:");

This renders out an input with a textbox and an OK and Cancel button. I need to detect if Cancel was clicked.

Cheers.

Answer 1

Check if selectedSiteName == null .
This will be the case if the user clicks Cancel or closes the dialog.

Answer 2

Read the JOptionPane API and follow the link to the Swing turorial on "How to Use Dialogs" for a working example.

Answer 3

if(selectedSiteName == JOptionPane.CANCEL_OPTION)
{


}

should work.

Answer 4

JOptionPane extends JComponent.

Methods of JOptionPane
1) .showMessageDialog(); // VOID :-(
2) .showInputDialog(); // return STRING :-)
3) .showConfirmDialog(); // return int :-)
-> and more...

Example:

void myMethod() {

        JDialog jd = new JDialog();
        jd.setDefaultCloseOperation(1);

        JOptionPane jop = new JOptionPane();
        int val = jop.showConfirmDialog(jd, "Hello");
        if(val == 0) jop.showMessageDialog(null, "Success", "INFO", jop.INFORMATION_MESSAGE);

        System.out.println(val);

        jd.add(jop);

    }

Helpful link:
- Why does JOptionPane.getValue() continue to return uninitializedValue
- https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html