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https://issues.apache.org/jira/browse/PIVOT-573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889856#action_12889856
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Greg Brown commented on PIVOT-573:
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There are several reasons that I am not supportive of this suggestion:
1) The syntax used by BXML's '$' operator and the scripting language may not be
compatible. For example, "$a.b.c" is currently resolved by JSON.get(). In
script, "a.b.c" might not even be resolvable, or might resolve differently.
This would be confusing to developers.
2) We'd need to include logic that detects a reference to a script function and
invokes the scripting engine rather than the existing code path. This logic
could be complicated - it's not valid to assume that all languages call
functions using the same syntax. It would also introduce additional processing
overhead when handling the '$' operator.
3) The definition of this expression is ambiguous: ${a.b.c.foo()}. What
exactly is being bound to?
The only way I could see adding support for this is via another operator
(perhaps '#'), since that would facilitate efficient and non-ambiguous
processing of the inline script. However, since there are several other ways to
accomplish this using the existing syntax, I don't see a strong use case for
adding this feature.
> Execute script expressions in WTKX component attributes
> -------------------------------------------------------
>
> Key: PIVOT-573
> URL: https://issues.apache.org/jira/browse/PIVOT-573
> Project: Pivot
> Issue Type: New Feature
> Components: wtk-wtkx
> Affects Versions: 1.5
> Environment: Using patched Pivot 1.5
> Reporter: Michael Allman
> Attachments: script_expressions_in_attributes.patch
>
>
> The attached patch allows users to put arbitrary script expressions in wtkx
> component attributes. This provides a superset of existing functionality,
> which allows the user to reference an object by its wtkx:id.
> For example, I have a Java class ms.allman.pivot.Validators with a static
> method getZipCodeValidator() that returns a Validator. Then the following
> WTKX fragment sets a zip code validator on the given TextInput:
> <TextInput
> validator="$Packages.ms.allman.pivot.Validators.getZipCodeValidator()"/>
> (This example assumes the use of the JavaScript engine for scripting.)
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