Vincent <vincent82 <at> gmail.com> writes:
> Here the defined type is Long ,cause I don't want the default value 0
> of long displayed in the field. Long will initial null for the default
> value , then this can solve above problem , but when later you want to
> get the long if nothing is inputted then the following
> <code>
> Long.longValue()
> </code>
> method it will throw null pointer exception. If you initialized before
> , then it will display a default value for that.
If possible, use Tapestry 4 whose NumberTranslator has an omitZero
property which serves exactly this purpose.
If you must stick to Tapestry 3, you may create a wrapper component
around the NumericField:
<parameter name="value" type="java.lang.Number"/>
<component id="numericField" type="NumericField" ...>
<binding name="value" expression="value2"/>
</component>
Number getValue2() {
if (getValue() != null && getValue().getDoubleValue() == 0) {
return null;
} else {
return getValue()
}
}
--
Author of a book for learning Tapestry (http://www.agileskills2.org/EWDT)
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