JOptionPane input problems

Question

Ok, so I understand that if you want to test what the user clicks in a JOptionPane, you would do something like this:

final int option = JOptionPane.showConfirmDialog(null, "That file name does not exist.", "File Name", JOptionPane.OK_CANCEL_OPTION);

                if(option == JOptionPane.CANCEL_OPTION)
                {
                    g++;
                }

However, what if I wanted to set a String = to a JOptionPane like this?

String fileName = JOptionPane.showInputDialog("File Name") + ".txt";

How am I supposed to compare what the user clicked then?

When you're using `showInputDialog()` you want to get user input from a textfield, not depend on what the user clicked — Paul Samsotha, Dec 14 '13 at 02:27
User types in some text. You could use a JOptionPane with a combobox to select options. That's another way — Paul Samsotha, Dec 14 '13 at 02:32
But I don't want the text field on the screen any longer than it takes for them to input the data. — NathanWick, Dec 14 '13 at 02:33
Ok so basically when the user clicks the "load" button, i want a JOptionPane to pop up where they can input the file name. However I want to be able to see if they clicked the cancel button or not. — NathanWick, Dec 14 '13 at 02:37
Just use `if (s != null){}`. `s` being the return form the `showInputDialog`. — Paul Samsotha, Dec 14 '13 at 02:39

Paul Samsotha · Answer 1 · 2013-12-14T02:43:21.873

When you're using showInputDialog() you want to get user input from a textfield, not depend on what the user clicked.

You can use either a JOptionPane with an input field

String s = JOptionPane.showInputDialog(null, "Enter a message:);

Or you can use a combobox style JOptionPane

Object[] possibilities = {"ham", "spam", "yam"};
String s = (String)JOptionPane.showInputDialog(
                null,
                "Complete the sentence:\n"
                + "\"Green eggs and...\"",
                "Customized Dialog",
                JOptionPane.PLAIN_MESSAGE,
                null,
                possibilities,
                "ham");

Edit:

String s = JOptionPane.showInputDialog(null, "Enter a message:); 
if (s != null){     // OK is pressed with a value in the field
    // do something with s
}

score 0 · Answer 2 · answered Dec 14 '13 at 02:41

you can use as you mentioned

String fileName = JOptionPane.showInputDialog("File Name");

Default input dialog has OK button and cancel buttons. Therefore if you press cancel button your string value will be null Otherwise it is the value you entered on textfield

so you can have a if(fileName == null) to check whether user clicked cancel or OK button

String fileName = JOptionPane.showInputDialog("Enter file name");
if (fileName == null) {
      System.out.println("User pressed cancel");
      //your logic
}else{
      System.out.println(fileName);
      //your logic
}

JOptionPane input problems

2 Answers2