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https://issues.apache.org/struts/browse/WW-3337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=47096#action_47096
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Wes Wannemacher commented on WW-3337:
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http://www.w3.org/TR/REC-html40/types.html#type-name
Looks like periods are allowed (as long as they aren't the first character).
I'd check the SVN log before committing the change because I thought this has
been changed to and fro before.
> Tag s:form silently rewrites "." in id attibute values
> ------------------------------------------------------
>
> Key: WW-3337
> URL: https://issues.apache.org/struts/browse/WW-3337
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - Tags
> Affects Versions: 2.1.8
> Reporter: Andreas Krüger
> Fix For: 2.2.0
>
>
> "Affects Version/s" is actually 2.1.8.1.
> In my JSP, I have a <s:form id="some.complicated.value">
> The HTML comes out at <form id="some_complicated_value">.
> The dots in the id value silently get changed to underscores.
> I did not find this replacement documented. Places I looked include
> http://struts.apache.org/2.1.8.1/docs/form.html and
> http://struts.apache.org/2.1.8.1/docs/tag-syntax.html and
> http://struts.apache.org/2.1.8.1/docs/form-tags.html .
> Suggestion:
> Either fix the tags library to not silently rewrite attribute values. This is
> prefered by this bug reporter.
> If a developer takes the trouble to nail down the id attribute to a specific
> value, that's the specific value that should be used.
> Or else, if there is a reason for the rewrite, kindly document both the
> rewrite and the reason.
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