How to communicate two plugins of News for Typoscript - typo3

Question

I have to show in my single page: the single and the list of News with the same categories of single new. I have two plugins in my backend page and have tried to assign the categories of single to the list for typoscript, but i could not do it.
This is the code, i used page.x for debug and catch values:
page.100 = TEXT
page.100.data = GP:tx_ttnews|tt_news
page.100.wrap = The single tt_news id is: |
page.100.data = GP:tx_ttnews|cat
page.100.wrap = The category of single is: |
page.110 = TEXT
page.110
{
value = { register:newsCategoryUid }
insertData = 1
wrap = - Categories: |
}
plugin.tt_news
{
categorySelection = { register:newsCategoryUid }
#show only selected categories
categoryMode = 1
}

Answer 1

It's not fully visible what you're trying. I think the best way should to put the cat value inside a temp object. Do you have the plugins inserted by TypoScript or as Content Element? You are using tt_news not news by georg ringer right?
temp.tx_news_catId = TEXT
temp.tx_news_catId.data = GP:tx_ttnews|cat
temp.tx_news_catId.intval = 1
page.110 < temp.tx_news_catId
page.110.wrap = Category: |
plugin.tt_news
{
categorySelection < temp.tx_news_catId
# you need to use data not categorySelection = {...} <- that should
# only work on constants
# but only works if categorySelection capabilities
#categorySelection.data = register:newsCategoryUid
#show only selected categories
categoryMode = 1
}
(Untested TypoScript)
hope this helps you a little bit
PS: Have you checked whether categorySelection has stdWrap capabilities?

Answer 2

I don't really get what you want to do, maybe this helps a bit:
If you want to show in the detail action articles with the same category as the current one, you can use a snippet like this one:
Add this to the Detail.html which will pass the first category uid to the TypoScript object lib.tx_news.relatedByFirstCategory.
<f:if condition="{newsItem.firstCategory}">
<f:cObject typoscriptObjectPath="lib.tx_news.relatedByFirstCategory">{newsItem.firstCategory.uid}</f:cObject>
</f:if>
and the TS:
lib.tx_news.relatedByFirstCategory = USER
lib.tx_news.relatedByFirstCategory {
userFunc = TYPO3\CMS\Extbase\Core\Bootstrap->run
extensionName = News
pluginName = Pi1
vendorName = GeorgRinger
switchableControllerActions {
News {
1 = list
}
}
settings < plugin.tx_news.settings
settings {
relatedView = 1
detailPid = 31
useStdWrap := addToList(categories)
categories.current = 1
categoryConjunction = or
overrideFlexformSettingsIfEmpty := addToList(detailPid)
startingpoint = 78
}
}
I have taken this from the manual.