Comments on: Editbox data input validation

By: LSHC

LSHC — Fri, 22 Oct 2021 17:55:07 +0000

In reply to Adam. I have the same problem in 2021 haha

By: Yair Altman

Yair Altman — Wed, 12 Jun 2019 15:49:58 +0000

In reply to Pedro Luis Guevara. Pedro - I will be happy to assist you as a professional (paid) consultant. Email me if you are interested.

By: Pedro Luis Guevara

Pedro Luis Guevara — Wed, 12 Jun 2019 15:46:40 +0000

Good morning. I have the following problem I have a uitable in main GUI that has “n” rows (the rows depend on the value that the user enters in a text box) and 10 columns. I require a code (something like a keypresskeypress event) that allows me to evaluate and discard the entered data that are not numeric both in the uitable and in some text boxes that I have in the main GUI. I do not know much about event management in MATLAB and I’m having a lot of problems with this. My uitable is called (“TablaDatosElementos”) and the text box that allows creating the number of rows is called (“NumElem”) Thank you very much and I hope you can help me.

I am a beginner in the use of MATLAB and more when I use tools that are foreign to it (like JAVA). Will it be that one of you can help me design a code for what I need? I can provide lines of the code of the program that I am doing if that helps.

I hope you can help me with this big problem.

Thank you

By: b

Fri, 08 Jan 2016 10:22:06 +0000

In reply to Adam. I have the same issue as Adam. For some reason it helps to display some (invisible) text in the command window before issuing setText(), like so:

fprintf(repmat(' \b',1,500))
jObj.setText(txt);

This helps preventing the aforementioned NPE in most (but not all) cases. Can anyone explain this? MATLAB 2015b 64-bit on Win7 64-bit machine.

By: Adam

Adam — Wed, 19 Aug 2015 20:19:31 +0000

Keeps showing Java exception errors in the Command Window. I have added some null checks into the editboxValidation function but couldn’t stop the error messages being displayed. When I hit a non-numeric character like space or a letter, computer beeps as it should and a long list of Java exception errors are shown in the Command Window. I am copying the error output below. I would appreciate if you could shed a light. Using MATLAB R2014a 32-bit on Windows 7 64-bit machine. Thank you.

Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException
at javax.swing.text.DefaultCaret.paint(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.paintSafely(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.paint(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintToOffscreen(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
at javax.swing.RepaintManager.paint(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.access$700(Unknown Source)
at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

By: David M

David M — Sat, 14 Feb 2015 21:44:50 +0000

For anyone interested in limiting the contents of the editbox in real-time, I recommend using the MaskFormatter wrapped in a JFormattedtextField. Here is an example for a 5 digit zip-code:

jMaskFormatter = javax.swing.text.MaskFormatter('#####');
jFormattedTextField = javax.swing.JFormattedTextField(jMaskFormatter);
javacomponent(jFormattedTextField,[10,10,120,25],gcf);

Info on the MaskFormatter class can be found here:

http://docs.oracle.com/javase/7/docs/api/javax/swing/text/MaskFormatter.html

By: Listbox layout customization | Undocumented Matlab

Listbox layout customization | Undocumented Matlab — Wed, 13 Nov 2013 20:08:41 +0000

[…] written on listboxes in a long while, and since I’ve recently posted on related controls (editbox, combo-box), I thought of following up with an article on customizing Matlab listbox layout. By the […]