Thanks @Mat this is a clever workaround solution.
@Tones, thanks for your reply, but I couldn't get your idea, how can I use
"range operator" to calculate the number "N" that I'll use in the "nth[N]"
operator?
On Tuesday, March 23, 2021 at 12:34:00 PM UTC+2 TW Tones wrote:
> Mats suggestion is one I use.
>
> Another trick is to use count to get the total number T of items then use
> a range operator from 1 to N, in which the current tiddler will be the item
> number.
>
> However you then need to retrieve the nth[N] item from the list.
>
> Regards
> Tones
>
> On Tuesday, 23 March 2021 at 21:24:41 UTC+11 Mat wrote:
>
>> You can use this to find the position of an item in a list
>>
>> +[allbefore<item>count[]add[1]]
>>
>> e.g
>>
>> {{{ one two three four five +[allbefore[four]count[]add[1]] }}} ----> 4
>>
>> Not sure it's the optimal solution, I just made it up.
>>
>> <:-)
>>
>>
>>
>> On Tuesday, March 23, 2021 at 10:57:48 AM UTC+1 Mohamed Amin wrote:
>>
>>> Hi,
>>>
>>> Is there a way to get the position of an item in a "list field"?
>>>
>>> More info:
>>> Recently I've discovered the "nth" filter operator
>>> <https://tiddlywiki.com/#nth%20Operator>, and one of the use case I
>>> immediately think about was to "iterate" through items in multiple related
>>> "list fields"
>>>
>>> Take the following example (not a real one, just to get the idea clear):
>>> If a family needs to manage its friends, each family member's Tiddler
>>> will have the following fields:
>>> 1- friend-names : "list field" contains ALL friends
>>> 2- friendships-start-date : "list field" where the "position" of the
>>> date determine the friend's names
>>> 3- friendships-meter : "list field" where the "position" of the %
>>> determine the friend's names
>>>
>>> Ex.
>>> friend-names : [[alex]] [[andy]] [[john]]
>>> [[evan]]
>>> friendships-start-date : [[Mar2015]] [[Dec2017]] [[Nov2016]]
>>> [[Feb2011]]
>>> friendships-meter [[70]] [[30]] [[60]]
>>> [[90]]
>>>
>>> Now I can use the filter "[contain:friend-name[alex]]" to get all
>>> family members who is a friend with "alex".
>>> And if I know the <<position>> of "alex" in the "friend-names" field, I
>>> can get the rest of the data corresponding to it for the currentTiddler
>>> using a filter like:
>>> "[all[current]get[friendships-meter]enlist-input[]nth<position>]"
>>>
>>> Regards
>>>
>>>
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