I have a form that I would like to validate. The rule is simple, only one
field can be submitted on the form. All other fields should be null. Here's
an example of how I'm currently doing it...
validation.xml:
<field property="firstName" depends="singleFieldOnly">
<arg0 key="label.firstName"/>
<var>
<var-name>singleFieldOnly</var-name>
<var-value>lastName,cardNumber</var-value>
</var>
</field>
<field property="lastName" depends="singleFieldOnly">
<arg0 key="label.firstName"/>
<var>
<var-name>singleFieldOnly</var-name>
<var-value>firstName,cardNumber</var-value>
</var>
</field>
<field property="cardNumber" depends="singleFieldOnly">
<arg0 key="label.cardNumber"/>
<var>
<var-name>singleFieldOnly</var-name>
<var-value>firstName,lastName</var-value>
</var>
</field>
here's my custom validator code:
public static boolean validateSingleFieldOnly(Object bean,
ValidatorAction va, Field field, ActionMessages errors,
HttpServletRequest request) {
String value = ValidatorUtil
.getValueAsString(bean, field.getProperty());
String sProperty2 = field.getVarValue("singleFieldOnly");
if (!GenericValidator.isBlankOrNull(value)) {
// tokenize the fields into an array
String[] fieldNameArray = sProperty2.split(",");
for (int i = 0; i < fieldNameArray.length; i++) {
// check each field for null
try {
// get the field value
String value2 = ValidatorUtil.getValueAsString(bean,
fieldNameArray[i]);
// if the field value is not null, return false
if (!GenericValidator.isBlankOrNull(value2)) {
errors.add(field.getKey(), Resources.getActionMessage(
request, va, field));
return false;
}
} catch (Exception e) {
errors.add(field.getKey(), Resources.getActionMessage(
request, va, field));
return false;
}
}
}
return true;
}
Basically, I check each field that I pass in with the singleFieldOnly <var>
to see if they're null. It gets pretty messy maintaining the validation.xml
when I have a huge form. I'm thinking this is a common scenario and there's
a more elegant solution out there.
I just picked up struts so any info would be appreciated. Thanks!
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