documentfilter

I figure this must be a simple mistake in the code or a misunderstanding on my part, but I cannot get a DocumentFilter to detect insertString events. Below is a simple filter for upper case letters, but that is not as important as the fact that the insertString(..) method never seems to be called! Why is the insertString(..) method of the DocumentFilter not called? The filter is applied to the JTextField at the top. Every time insertString(..) is called, it should append information to the JTextArea in the CENTER . At the moment, there is no action in the text field that causes text to be

I'm using DocumentFilter to restrict input as integer or decimal. And the code I post here is working well for that. Can anybody help me about how to restrict the input length or range in the given code? Thanks!! class MyIntFilter extends DocumentFilter { public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException { Document doc = fb.getDocument(); StringBuilder sb = new StringBuilder(); sb.append(doc.getText(0, doc.getLength())); sb.insert(offset, string); if (test(sb.toString())) { super.insertString(fb, offset, string, attr); } else {

I am using a DocumentFilter on a JTextField which is used to enter in the amount of time an employee has worked. the filter is to ensure that the limit of input is only 4 characters long and to only allow numbers. A decimal may or may not be used but should only be allowed to be entered once, once a decimal is entered, there should only allow for one more number. Meaning 9.5 or 10.5 should be accepted and 8.45 is not. So far I am able to get about half of the total desired functionality. No more than 4 characters can be entered and only digits are allowed. The latter is accomplished using the

here's the code that i have on how to limit the character input length class JTextFieldLimit extends PlainDocument { private int limit; // optional uppercase conversion private boolean toUppercase = false; JTextFieldLimit(int limit) { super(); this.limit = limit; } JTextFieldLimit(int limit, boolean upper) { super(); this.limit = limit; toUppercase = upper; } @Override public void insertString (int offset, String str, AttributeSet attr) throws BadLocationException { if (str == null) return; if ((getLength() + str.length()) <= limit) { if (toUppercase) str = str.toUpperCase(); super

I use a DocumentListener to handle any change in a JTextPane document. while the user types i want to delete the contents of JTextPane and insert a customized text instead. it is not possible to change the document in the DocumentListener ,instead a solution is said here: java.lang.IllegalStateException while using Document Listener in TextArea, Java ,but i don't understand that, at least i don't know what to do in my case? DocumentListener is really only good for notification of changes and should never be used to modify a text field/document. Instead, use a DocumentFilter Check here for