[TYPO3-mvc] Include Javascript

[Jost Baron]

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Hi!

In an extbase extension I want to include some Javascript. I've
googled, and found out that the way to include JS is via

$this->additionalHeaderData = '...';

in an action. This doesn't work though, and I can't find anything
similar in the sources.

So how do I include Javascript (or CSS) in from a extbase extension,
preferably only in one single action?

Thanks,
Jost
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