TW5: extracting data from data dictionaries

[HowardM]

I find data dictionaries very useful for storing short pieces of information but am struggling to extract the data except in the simplest way.  In the $list widget I can list, search & sort the indexes to a data tiddler, then display the corresponding values, but cannot find any way of selecting or sorting a display of dictionary entries based on the values.   Is there some way of doing this ?

Alternatively, I understand JSON is a more flexible form for data tiddlers and have looked at the formal definition of these on json.org but I cannot find any explanation of how you can use or display specific content from a JSON using existing widgets, filters etc.   To take $:/HistoryList as an example of a valid JSON structure, if I had a similar structure how would I extract the equivalent of "title", "fromPageRect" etc and how could filters be used on it ?  

Grateful for any advice

Howard

[Jeremy Ruston]

Hi HowardM

As you've found, the current support for using data tiddlers and JSON tiddlers from wikitext is limited to accessing and enumerating the top level properties. That was enough to meet the needs of the core UI. The plan eventually is to improve support so that arbitrary indexes can be accessed.

Best wishes

Jeremy

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[Stuart Amor]

Has anybody develop a hack for this? My data tiddlers look like this:

Sink: 1
Taps: 1
Toilet: 0

I would like to create a list of all the Index values, but only the ones that have a value of "1"

[BJ]

Hi Stuart,

this is based on similar one for fields by  Jeremy

\define inner(tid,indexName,match)
<$set name="v" value={{$tid$##$indexName$}}>
<$list filter="[<v>regexp[^$match$$]]" variable="x">
<$text text="""$indexName$"""/>
</$list>
</$set>
\end

\define matchvals(tid,match)
<$set name="t" value=$tid$>
<$list filter="[<t>indexes[]sort[]]" variable="indexName">
<$macrocall $name="inner" tid=<<t>> indexName=<<indexName>> match=$match$/>
</$list>
</$set>
\end
<<matchvals datatid 0>>

all the best

BJ