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

<input type="submit" value="承認" 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?