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How to display a custom dialog in netbeans JFrame editor?

I am using the JFrame feature in NetBeans in order to make it simpler to customize and edit. In my program, clicking a button calls an action that displays a dialog box. I want to have an image inside of that dialog box. In NetBeans along with its JFrame editor you can add boxes and customize them, along with a dialog box. Which means it will be easier to edit that dialog box.
How to I call that custom dialog box to display when the button is clicked?
To put it more simply without the need for puting code. I have created a cusome dialog box in netbeans GUI builder. Now, how to I call/use that custome dialog box inside of my actual JFrame, which was also coded inside the netbeans GUI editor, and is located inside the same package and all.

First Drag and drop Swing Windows >> Dialog.
Then inside your code write this line to show it
jDialog1.setVisible (true);
After that double click on the Dialog design and add as many components as you like
Best Wishes

NetBeans - How to show all Swing components in a JFrame?

I'm making a Swing GUI with NetBeans, using the built-in form maker, which works quite well.
However, if I accidentally put the wrong panel on a form, I have no way to delete it, or select it again.
Likewise, if I want a button to open a new window, say, a file chooser, I don't know how to add that file chooser to the form, but not have it appear until the button is pressed.
Does anyone have any experience with the NetBeans Swing form builder? This seems like a common thing to have to do, but I don't see how to do it. Am I missing something?

Yay a netbeans user!Yea there should be a navigator window in the bottom left corner. There it displays all of the components on the form. Im not too sure what you mean by a file chooser, but to open a new window,ie another Jform, you create another form class. Then you create that form and setVisible.
So lets say you have
a form mainProgram
And form helpMenu
In the mainProgram
public mainProgram(){
InitComponents();//or something on the lines of that
helpMenu helpMenuWindow = new helpMenuWindow();
helpMenu.setVisible(true);
}
This will allow you to be able to open new windows, but if you click on the red X to close the window, it closes your whole program. In properties for the helpMenu pane you can select the option for what the window should do on exit.
Exit
Hide
Do nothing
In the code above is the code that is run before the Jpane displays, if you want to show or hide items, just code
Object.setVisible(boolean);
I hope I answered your question Tetramputechture.

How do you make a Java checkbox open a window?

I made a Checkbox so where when you click it it opens another window with more checkboxes. How is it you would go about making those checkboxes open another window?

Have you tried adding an actionlistener to your checkBox component?
It's hard to see what excactly you're trying to achieve; but from what you write it shouldn't be more than that.
You can try this tutorial, for starters:
http://www.java2s.com/Code/JavaAPI/javax.swing/JCheckBoxaddActionListenerActionListenerlis.htm

Java - Advanced modal dialog

I would like to create a modal input dialog with some textboxex/labels. It's supposed to something like "Add client dialog" with name, surname, etc..
I've been searching the net for almost an hour and nothing.. JOptionPane can't handle the task, JFrame has no ShowDialog method etc. How can I accomplish the task in Swing?

JOptionPane can't handle the task,
As you've realized you can add any component to a JOptionPane, including a panel.
One problem is that focus will be placed on the buttons, not the panel.
You can check out Dialog Focus for a simple solution to this problem.

You just need to add a plain old JDialog. Make it modal and use its content pane for your widgets.

Adding a scrollable label to an option dialog

I am creating an options dialog using JOptionPane.showOptionDialog(...)
When I click one of the buttons added to this dialog, I need a label to apear underneath on the dialog (and this label should be scrollable if necessary). I have written event handlers for the buttons, but I am not sure how to get this label to appear on the dialog.
Any help would be great.
Update: I realized that it would be ok if I somehow called JOptionPane.showOptionDialog(...) with an initial message, and then when one of the buttons was clicked I would change the message. Is this possible?

JOptionPane static methods are only shortcuts to easily create a dialog with option buttons and a fixed message. If you check the source from it, you will see that all is wrapped in this purpose. It's only a convenience class over a frequent use case of dialogs.
The suggestion from comment is correct, if you want more than this, you will have to create your own JDialog, as it will be easier than trying to change something from this generated dialog.
Edit: You can create your own JDialog yourself, using layout managers. A more simple way, suggested as well in the previous link, is to use a GUI builder, like the one included in Netbeans.