Avoid user entering more than 2 decimal figures in textfield

[Smriti Anchu]

Hi all,


I have a textfield which has to accept the currency. While keying in the the values, the user when he tries to enter a 3rd decimal value, it should consume. How do i do this?

Can anybody help me in this


regarsd
smriti

[Dave Jones]

Hello !
You did not say if you are using swing,AWT or SWT, anyway, I'm using SWT
and I believe that basiclly this shuld be in every one of them (maybe a not excactly the same name)
Anyway , use this:

( Text myText = new Text(composite,SWT.NONE) )
myText.setTextLimit(2);
this will not let the user enter more that 2 digits
Hope this is what you need
Dave

[Smriti Anchu]

Hi Dave,
I am using swing. I tried your code,

I dont want to limit the numbers to only 2 but i want the user not to enter more than 2 decimals.
For ex. the number can be 4311.22 and not 4311.222222. I want to limit the number of digits in the decimal place to 2.


thanks
smriti

[Gregg Bolinger]

Use the JFormattedTextField.

[Smriti Anchu]

Hi,

Is there any other way other than using JFormattedTextField ?


smriti

[Smriti Anchu]

i tried using formattedTextField..

but if i give the format to be of
JFormattedTextField tamount;
MaskFormatter amount;

try {
amount = new MaskFormatter("################.##");
}
catch(IOException e){}

tamount = new JFormattedTextField(amount);


When i use the above, the application wants me to enter all the 16 numbers. and 2 fraction digits. How do i avoid this?

regards
smriti

[Stuart Gray]

Don't use a MaskFormatter; use a NumberFormat and the setMaximumFractionDigits method.

[Smriti Anchu]

How do i use a NumberFormat

I tried in the following manner

 
 NumberFormat curfmt = NumberFormat.getCurrencyInstance();
   curfmt.setMinimumFractionDigits(2);
   curfmt.setMaximumFractionDigits(2);
   curfmt.setGroupingUsed(false);
   txt_amount = new JFormattedTextField(curfmt);
 

But when i start typing digits into the textfield it is allowing me to enter more than 2 decimal digits.

regards s
smriti

[Stuart Gray]

True, but when you move away from the field the value should be validated, the result depending on whether you have chosen to COMMIT or REVERT.

[Smriti Anchu]

How do i validate? Can u give me some example.

regards
smriti