🚀 go-pugleaf

Walter Jacobs <walter.jacobs@skynet.be> wrote in message
news:7f9h1n$n8n2@forums.borland.com...
> Hi,
>
> I am looking for a way to prevent the user to input more characters than
are
> allowed in the linked queryDataSet Column .
> I am using JBuilder 2.0
>
> For example
>     "Name" may have a maximum of 6 characters
>
> I set:
>        jdbTextField.setAutoscrolls(false);
>        jdbTextField.setColumns (6);
>
> and in the queryDataSet:
>       column1.setDisplayMask("aaaaaA")
>
> Still I can enter as much as characters I want in the TextField.  Even
> horizontal scrolling still does happen.
>
> When I enter 10 characters, there is no error given and the first 6
> characters are put in the variable (column).
>
> Has someone a solution and an explanation why both setAutoscroll and
> setColumn does not work?
>
>
> thanks for the help
>
> Walter
>
>
> I am using JBuilder 2.0


Walter,

I use a modified JTextField that uses a custom Document that extends
PlainDocument.  I add a maxlength variable to the document (and to the text
field, so that I can say myTextField.setMaxLength(6)).   Anyway, override
the insertString method of the PlainDocument to handle the maximum length.
Example:

    public void insertString(int offs, String str, AttributeSet a) throws
BadLocationException
    {
        String insString;
        if (upshifted)  // I also use an upshifted flag to indicate text
must be in all uppercase
            insString = str.toUpperCase();
        else
            insString = str;
        if (maxLength > -1 && getLength() + str.length() > maxLength) // if
maxlength is set and
        // text length plus inserted text length is greater than maxlength
        {
            insString = insString.substring(0, maxLength - getLength());  //
trim off excess text
            Toolkit.getDefaultToolkit().beep();  // beep to say the text is
too long
        }
        super.insertString(offs, insString, a);
    }


Hope this helps.

Jason Burton