Re: Limit the number of characters that can be entered into JTextArea

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.help
Date:
Tue, 23 Sep 2008 21:38:18 -0700
Message-ID:
<48d9c439$0$5216$b9f67a60@news.newsdemon.com>
CBO wrote:

Hi all,

I am currently developing a java application that has two JTextAreas.
I want to be able to limit the number of characters that a user can
enter to 50. How would I go about doing this.

Any help in this matter would be highly appreciated.

Thank you


//
//
// FixedLengthDocument
//
//

package com.knutejohnson.classes;

import javax.swing.text.*;

public class FixedLengthDocument extends PlainDocument {
     private int length;

     public FixedLengthDocument(int length) {
         if (length <= 0)
             throw new IllegalArgumentException("length <= 0");
         this.length = length;
     }

     public void setDocumentLength(int length) {
         if (length <= 0)
             throw new IllegalArgumentException("length <= 0");
         this.length = length;
     }

     public int getDocumentLength() {
         return length;
     }

     public void insertString(int offs, String str, AttributeSet a)
      throws BadLocationException {
         if (str != null) {
             if (str.length() + getLength() > length)
                 str = str.substring(0,length - getLength());
             super.insertString(offs, str, a);
         }
     }
}

--

Knute Johnson
email s/nospam/knute2008/

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