Apple WebObjects 3.5 - Manual (Page 89)

Refining Main.wo
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Setting a Number Format
In addition to a dateformat attribute, text field elements also have a numberformat
attribute.
1. Inspect the revenue text field.
The revenue text field’s numberformat attribute is bound to the string
“###.##”. This binding tells the text field that it’s displaying a number
and describes how to format it.
2. Change the text field’s numberformat binding value to the string (including
the quotes): "$ #,##0.00" .
Using this number format, the Movies application formats the number
1750000 as $ 1,750,000. For more information on creating number
formats, see the NumberFormatter class specification in the
Foundation Framework Reference.