I think I would start by restructuring the data differently. Even in a
robust language like javascript I would avoid storing data in two parallel
"arrays" like you are doing. It would be so easy to get them out of synch.
Maybe keep the list of family members, but then have the field "roles"
contain the name of a data tiddler that describes the relationship:
roles: Burts family roles
Burts family roles: (data tiddler)
Burt: son
Connie: wife
Danny: brother
Or keep the list of family members, but then have a series of fields that
describe roles:
role-sons: [[Cycil de Mille]] [[Cyrano de bergerac]]
role-wives: Connie
role-brothers:Danny [[Dante Alighieri]]
You can use the fields operator to get a list of all fields and the prefix
operator to limit that selection to just ones marked "roles-" .
There's no arrays in TW parlance, but there are lists and list fields. See
the tiddler "Filter Operators" at tiddlywiki.com and review list, enlist,
listop operators and string operators to get an idea of the tech available.
AFAIK, there's no indexing lists, but there are other tools. If you have
items in the list with spaces in the name, surround the name with double
square brackets as in the examples above.
Also, you can nest <$lists> inside lists, linking the inner ones with the
'all[current]' filter operator to be driven by the outer ones.
So, I recommend picking a data structure that matches the way TW works
(probably the 2nd method, thought the first method corresponds to better
database design).
But maybe someone will come along with a more straight-forward solution. So
rather than diving into an example, let's see what others say.
-- Mark
On Thursday, June 21, 2018 at 5:52:00 AM UTC-7, Paul Netsaver wrote:
>
> Hi,
> I'm trying to have multiple fields whose content is an array, and I need
> help on how to manipulate them.
> Let's have a tiddler about a person (tiddler) *Alfred*, having *Burt,
> Connie, Danny* as relatives.
> The relationship of B,C,D to A is respectively: *son, wife, brother*.
> So I would like to use two fields: '*relatives*' and '*role*' to describe
> the situation. Note that 'role' is not absolute, but limited to Alfred.
> I would build two arrays as fields:
> *relatives*: '*Burt Connie Danny*' and
> *roles*: '*son wife brother*';
> There is more than one question about:
>
> 1. can I put a separator like any array, so that I'm able to separate
> items or I'm forced to use a space as separator? Otherwise I will never be
> able to insert double names, as 'Mary Ann'. Or there's an escaping
> character, as '\'.
> 2. can I refer to a single name as element of the array? Something
> link {{ !!relatives[2] }} or {{ !!roles[1] }}. I've tried widgets like
> <$list> and <$view> but I don't know how to address single fields. Or
> maybe
> assign the field to a variable and access the variable (...how?)
>
> I tried also to write a table associating relatives and roles and also
> that was not so easy (I used a technique from
> stephenteacher.tiddlyspot.com
> <http://stephenteacher.tiddlyspot.com/#Force>):
>
> <table>
> <tr><th>relatives</th><$list filter="[list[!!relatives]]" >
> <td><$transclude field="title"/></td>
> </$list></tr>
> <tr><th>roles</th><$list filter="[list[!!roles]]" >
> <td><$transclude field="title"/></td>
> </$list></tr>
> </table>
>
> This works because the list commands are independent each other as they
> are on different rows.. but I want to list the elements by rows, not by
> columns, so I should do something like:
>
> <table>
> <tr><th>relatives</th><th>roles</th></tr>
> <$list filter="[list[!!relatives]]">
> </tr>
> <td><$transclude field="title"/></td>
> <td><$transclude field="roles field of Alfred tiddler"/></td>
> </tr>
> </$list>
> </table>
>
> I understand that <$list> command assumes a list of tiddlers (not generic
> arrays) as input, so it uses *title *field of (non existing) *relatives*
> tiddlers.
> Is there another more 'trivial' technique as for arrays? Like:
>
> <table>
> <tr><th>relatives</th><th>roles</th></tr>
> * <$for index="i=1:length(relatives)">*
> </tr>
> <td><$view *field="relatives[i]"*/></td>
> <td><$view *field="roles[i]"*/></td>
> </tr>
>
> </$list>
> </table>
>
>
> Any suggestion is welcome...
>
> Thanks and regards,
> Netsaver, Rome (IT)
>
>
>
>
>
>
>
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