The standard way is to write your own validator that does your processing
before calling the standard validator's method. Here's a simple one I wrote
recently to allow dollar signs and commas in the user's input.
/**
* Provides input validation for strings treated as numbers. Derived from
* NumberValidator. Trims the input string and ignores dollar signs and
* commas.
*/
public class DollarValidator extends
org.apache.tapestry.valid.NumberValidator
{
public Object toObject(IFormComponent field, String value) throws
ValidatorException
{
if (value != null) {
// trim() returns a copy of the string as desired.
value = value.trim();
// Strip out the dollar signs and commas.
List pieces = CString.componentsSeparatedByDelimiters(value,
"$,");
value = CString.componentsJoinedByString(pieces, "");
}
return super.toObject(field, value);
}
}
----- Original Message -----
From: "Nathan Lai" <[EMAIL PROTECTED]>
To: "Tapestry users" <[email protected]>
Sent: Tuesday, May 10, 2005 11:37 AM
Subject: Pre-processing a text before it is validated
> In Tapestry, how can I pre-process the value of a valid field before it
> is validated? For instance, I want to filter out all non-alplanumeric
> symbols in a string that is supposed to contain only alphanumeric
> characters.
>
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