How to use variables in filter expressions

[Werner]

Hi, pretty new to TiddlyWiki and still trying to wrap my head around various concepts. Also did some searching in this group but haven't found anything that could help me.

OK, I want do some kind of dynamic filtering, according to a given variable. Basically, I want to set a variable and use it in a filter to reference the contents of a field. So, the result should look something like that

<<list-links "[field:blt[<currentBlt>]tag[Products]!field:status[1]]">>

where <currentBlt> would be the variable to be used.

Thanks for helping me out on this.

Best

Werner

[TonyM]

Werner,

Just remove the [ ] from [<currentBlt>]

<<list-links "[field:blt<currentBlt>tag[Products]!field:status[1]]">>

I have a draft document covering this and more here http://tiddlywiki.psat.com.au/#Variables%2C%20Parameters%20and%20transclusions

See the within filters

• There is no need to include html or widgets in Filters so single bracket versions are used (unlike Within wikiText)

In Wiki text we must allow <htmltag></htmltag> to be identified as they are different from <<macropname>>, <$widgetname></$widgetname> but not in filters.

so <variableormacro> and {tiddlername} or {tiddlername!!fielodname} are used in filters

• since the above delineate the beginning and end of a variable or transclusion you leave out a set of [ ] in filters.

eg filter="[!has<fieldnamevar>]" or "filter="[<currentTiddler>backlinks[]]" "filter="[subfilter<subfilterdefinition>]"

While a variable's 'value', or a macros 'output', can be used as a filter parameter, 'macro parameters' are not supported in filters.

<macroname parameter> can be used but the parameter is ignored ????? TEST

Regards

Tony

[Werner]

Thanks Tony, works. Still, what kind of string/variable concatenation works under what circumstances is pretty confusing. Bit of a learning curve actually.

Best

Werner

[TonyM]

Hopefully that will get fully documented in the link I gave. Please contribute