How to make jTextField 's input unscrollable?

Question

Dear All
i create a JTextField, i want to set it inputsize = 5(charaters)
i am doing like this
JTextField jTextField = new JTextField(5);
jTextField.setScrollOffset(0);
but it doesnot work out
it is still scrollable, i main i could input more than
5 charaters
How to fix JTextField's input size?
Thx in advance

Answer 1

Hi,
that does not change the amount of characters, you can input, it only says, that the JTextFields-size should be 5 times as wide as an average char.
If you want to limit the characters you will have to replace the Plaindocument JTextFields uses internally with a subclass of it, that overwrites its insertString(...)-method. An example, that makes all input upcase is found in the documentation of JTextField. You can do your checking in a similar way there - just checking if the length of the string to insert plus the length of the text that is currently in the box is greater than the maximum length - if it is not, pass all parameter simply to the super.insertString(...)-method - if it is greater, that only do a Toolkit.getDefaultToolkit().beep().
Also there are many topics dealing with this stuff - please search the forum for it.
greetings Marsian