[Springframework-developer] Enhancement for BindException and BindTag

[Seth L. <se...@eh...>]

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Hello,

Please let me know if this is/was a good idea.  With the addition of the
<spring:nestedTag> functionality, I needed to extend the <spring:bind>
tag a little bit.  I needed to get the errors for a property and all of
its fields.  The previous bind tag only understood .* to be "all errors
of the bound object".  I extended it to allow .* at the end of any
object in the graph.

For instance, you can now do this:

public class Command {
~  public SubCommand getSubCommand() { }
}

<spring:nestedPath path="command">
~  <spring:bind path="subCommand.*">
~    <c:if test="${status.errors}">
~    Errors inside the subCommand child object!
~    </c:if>
~  </spring:bind>
</spring:nestedPath>

This way, a bind request can ask for all errors on an object.  We find
this very useful when displaying pages.  For instance, we use 3 drop
downs for a date (month, day, year).  We want to say "Are there errors
on the date?" instead of "Are there errors on date.day, date.month, or
date.year?"

Attached is a patch that makes this work.  I hope the intent is clear,
and if Juergen likes it, he can/should clean it up.  A test is included
as well.

Ideas?  Thoughts?  I know I've been pushing the limited of the bind tag
and usage lately.  If there is a better way to do this, please let me know.

Thanks,
Seth

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