This week's giveaway is in the Android forum.
We're giving away four copies of Android Security Essentials Live Lessons and have Godfrey Nolan on-line!
See this thread for details.
The moose likes Swing / AWT / SWT and the fly likes Mask JTextField  1.3 Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of Android Security Essentials Live Lessons this week in the Android forum!
JavaRanch » Java Forums » Java » Swing / AWT / SWT
Bookmark "Mask JTextField  1.3" Watch "Mask JTextField  1.3" New topic

Mask JTextField 1.3

Rodolfo Velasco

Joined: Jul 05, 2006
Posts: 17
Hi Ranchers ...

it is possible to Mask a JTextField in JDK 1.3 ?

I'm trying to make it easyer for the user to enter a date and a Phone number


Thanks in Advance ...
Brian Mozhdehi
Ranch Hand

Joined: Aug 17, 2006
Posts: 81
You can do one of two things that I know of off the top of my head. One is use a keylistener on the textfield and in your method KeyReleased, validate the last character pressed to see if its consistent with the mask, i.e. if the mask is (XXX) XXX-XXXX, then when they enter the 10th character, make sure its a "-" or enter the dash for them. How you know what character they are on is YourTextField.getText().trim().length() (after checking that getText() is not null).

Something like this:

public void keyReleased(KeyEvent e)
String data = "";

if(YourTextField.getText() != null)
data = YourTextField.getText().trim();

int index = data.length();

if(index = 1 && e.getKeyChar() != ')')
//show error message and return
else if(index = 2 && Character.isDigit(e.getKeyChar())
//show error message and return

//etc, etc

The other way is to validate on focusLost, i.e. using a focus listener, which doesnt really validate as they enter, but at least validates before they save.
I agree. Here's the link:
subject: Mask JTextField 1.3
Similar Threads
How to implement the wall follower algorithm in java?
Developing JTextField which accepts only date
Could you please help me?
Who is this guy?
truncates parameters after # in URL with Internet Explorer