I had created a JOptionPane of type showInputDialog. When it opens it, it shows me two buttons: OK and Cancel. I would like to handle the action when I push on Cancel button, but I don't know how to reach it. How can I get it?
For example:
int n = JOptionPane.showConfirmDialog(
frame, "Would you like green eggs and ham?",
"An Inane Question",
JOptionPane.YES_NO_OPTION);
if (n == JOptionPane.YES_OPTION) {
} else if (n == JOptionPane.NO_OPTION) {
} else {
}
Alternatively with showOptionDialog:
Object[] options = {"Yes, please", "No way!"};
int n = JOptionPane.showOptionDialog(frame,
"Would you like green eggs and ham?",
"A Silly Question",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE,
null,
options,
options[0]);
if (n == JOptionPane.YES_OPTION) {
} else if (n == JOptionPane.NO_OPTION) {
} else {
}
See How to Make Dialogs for more details.
EDIT: showInputDialog
String response = JOptionPane.showInputDialog(owner, "Input:", "");
if ((response != null) && (response.length() > 0)) {
}
The showMessageDialog, shouldn't show two buttons, so something is amiss with either your code or your interpretation of it. Regardless, if you want to give the user an choice and want to detect that choice, don't use a showMessageDialog but rather a showConfirmDialog, and get the int returned and test it to see if it is JOptoinPane.OK_OPTION.
This is an old question, and I am an Java newbie so there might be better solutions, but I wanted to know the same, and maybe it can help others, what I did was to check if the response was null.
If the user clicks "cancel", the response will be null. If they click "ok" without entering any text the response will be the empty string.
This worked for me:
//inputdialog
JOptionPane inpOption = new JOptionPane();
//Shows a inputdialog
String strDialogResponse = inpOption.showInputDialog("Enter a number: ");
//if OK is pushed then (if not strDialogResponse is null)
if (strDialogResponse != null){
(Code to do something if the user push OK)
}
//If cancel button is pressed
else{
(Code to do something if the user push Cancel)
}
package Joptionpane;
import javax.swing.JOptionPane;
public class Cancle_on_JOptionPane {
public static void main(String[] args) {
String s;
int i;
for (i=0;i<100;i++){
s = JOptionPane.showInputDialog(null,"What is your favorite fruit ?");
try {
if (s.equals("")) {
JOptionPane.showMessageDialog(null," Enter your answer !!!"," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
i=2;
} else {
JOptionPane.showMessageDialog(null," s = "+s," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
i=100;
}
}
catch (Exception e) {
JOptionPane.showMessageDialog(null,"Cancle answer !!!"," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
i=100;
}
}
}
}
You could do it like this:
String val = JOptionPane.showInputDialog("Value: ");
if(val == null){
// nothing goes here if yo don't want any action when canceled, or
// redirect it to a cancel page if needed
}else{
//insert your code if ok pressed
// JOptionPane return an String, as you was talking about int
int value = Integer.ParseInt(val);
}
This may be your answer:
package Joptionpane;
import javax.swing.JOptionPane;
public class Cancle_on_JOptionPane {
public static void main(String[] args) {
String s;
int i;
for(i=0;i<100;i++){
s = JOptionPane.showInputDialog(null,"What is your favorite fruit ?");
try{
if(s.equals("")) {
JOptionPane.showMessageDialog(null," Enter your answer !!!"," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
i=2;
}
else {
JOptionPane.showMessageDialog(null," s = "+s," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
i=100;
}
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null,"Cancle answer !!!"," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
i=100;
}
}
}
}
来源：https://stackoverflow.com/questions/11494222/how-to-handle-cancel-button-in-joptionpane