[Seasar-user:10933] dynamic validator

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<input type="text" id="number" />

<input type="submit" value="³ÐÕJ" class="button" id="doApprovalConfirm" />

public Validator getDateValidator() {
ValidatorChain chain = new ValidatorChain();
TRequiredValidator validator = new TRequiredValidator();
if (number != 0) { chain.add(validator); }
return chain;
}

I can't get the input value of number . Why?
I want to dynamic validator the Date accroding to the number.
what should i do?
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