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http://www.stripesframework.org/jira/browse/STS-846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12395#comment-12395
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Samuel Santos commented on STS-846:
-----------------------------------
Hi Iwao,
I rather go with the 'formatPattern' attribute than with a custom formatter
that does not bring any additional benefit.
A double has a significand precision of 53 bits (approximately 16 decimal
digits) and can easily handle my needs.
On top of that, the double field is on an external entity which I do not
control, and I have no desire in wrapping into a custom object or extending it.
A better solution to this (since Stripes always uses the NumberFormatter to
format numbers on inputs) is to detect the number of decimal digits from the
input value (a String) and use NumberFormat to automatically apply the right
pattern (e.g. ###0.###...###) to maintain all digits.
Or why not just forget about any formatter if the user does not fill formatType
and formatPattern attributes?
Check if those attributes are missing and change the line 328
InputTagSupport.java from:
String formatted = (formatter == null) ? String.valueOf(input) :
formatter.format(input);
to
String formatted = String.valueOf(input);
Anyway, you have to admit that having different outputs whether triggering a
validation error or not is just wrong.
> Strange behavior with Double fields
> -----------------------------------
>
> Key: STS-846
> URL: http://www.stripesframework.org/jira/browse/STS-846
> Project: Stripes
> Issue Type: Bug
> Components: Formatting
> Affects Versions: Release 1.5.6
> Reporter: Samuel Santos
> Priority: Critical
>
> I have a strange behavior with fields using the type Double.
> If I submit a form with a double field in it and get a validation error (e.g.
> a different required field that is missing), the input is populated with the
> exact value that I have inserted (e.g. 3.123456789).
> But if I do not trigger a validation error and forward to the same JSP page,
> the input is populated with the right value but trimmed to only 3 decimal
> cases (e.g. 3.123).
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