The "field-metadata" tag should provide the "on" property value
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                 Key: STS-629
                 URL: http://www.stripesframework.org/jira/browse/STS-629
             Project: Stripes
          Issue Type: Improvement
          Components: Tag Library
    Affects Versions: Release 1.5
            Reporter: Mike McNally
            Priority: Minor


The clever and useful "field-metadata" tag would be even better if it were to 
include the "on" property from field validation metadata. The "on" property 
value would make it possible for client-side code to figure out whether fields 
marked "required" really are required in the actual context of the form.

A variation on this would be to provide a way to tell the tag what event should 
be considered as the one for which validation will be performed. With that 
change, the tag would internally determine whether the "required" property is 
true or not. Thus my page would say something like

  <s:field-metadata var='meta' event='save'>/* whatever */</s:field-metadata>

and the resulting block of metadata would only mark those fields "required" 
which are so marked for the "save" event.



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