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https://issues.apache.org/struts/browse/WW-2002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43939#action_43939
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Musachy Barroso commented on WW-2002:
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That distinction cannot be done in javascript. In javascript, even if a field
has no value, its value is "", instead of null (like in java). That's why you
need to use "requiredstring" as it will check for the string size.
> Inconsistent client/server validation using RequiredFieldValidator
> ------------------------------------------------------------------
>
> Key: WW-2002
> URL: https://issues.apache.org/struts/browse/WW-2002
> Project: Struts 2
> Issue Type: Bug
> Components: XML Validators
> Affects Versions: 2.0.8, 2.0.9
> Environment: Windows 2000, Tomcat 5.5.23, java 1.6.0_01
> Reporter: Marc-André Thibodeau
> Fix For: 2.1.3
>
>
> We noticed different behaviors between client-side and server-side
> validations using a RequiredFieldValidator annotation. Using this
> annotation, an empty field is considered invalid when validated on the
> client-side, while it is accepted by the server-side validation (when
> javascript is not supported). It does not downgrade gracefully.
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