In this case,
we allow up to two numeric characters.
Chapter 3
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-wap-input-required sets whether the field is required or not. Not all browsers
support these properties consistently. But it's good practice to provide such
constraints at the user side in addition to server-side validation. Supporting mobile
browsers will change the input mode to numeric mode (or other) automatically
based on the input mask. This makes it very convenient for the user as she or he does
not have to keep changing input modes among form fields. The next two figures
show this CSS in effect in the Openwave browser.
-wap-input-format takes a format string as its value. This value becomes the input
mask for the field. The following table shows valid format characters.
Character Meaning
a Any lowercase letter or symbol.
A Any uppercase letter or symbol.
n Any numeric or symbolic character.
N Any numeric character.
x Any lowercase letter, numeric, or symbolic character.
X Any uppercase letter, numeric, or symbolic character.
m Any character. Browser input mode is set to lowercase by default.
M Any character. Browser input mode is set to uppercase by default.
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