Compare field in ListWidget

#1

Hello again,

I’m struggling comparing the value of a field with the value of the previous field in a filter.

<$list filter="[tag[Task]Einteilung[Monat]sort[Fällig]]">
  <$view field="Fällig" format=date template="mmm YY" /><br>
  <$link><$text text={{{ [{!!title}removeprefix[Task:]] }}}/></$link><br>
</$list>

I want the

<$view field=“Fällig” format=date template=“mmm YY” />

only be shown if the value changes. My approach would be to put the value in a variable and compare it in the next loop, but I’m not sure how to do this in Tiddlywiki.

Thanks for your help in advance,

Ben

#2

Hey Ben,

See if this snippet of code gives you some ideas:

<$let values={{{ [[Z]] [[C]] [[B]] [[D]] [[A]] +[sort[]] +[join[;]] }}}>
  <$list filter="[<values>split[;]]" counter=c>
    <$let cm1={{{ [<c>subtract[1]] }}} >
      <<c>>: {{!!title}} <$list filter="[<c>!match[1]]">(Previous = {{{ [<values>split[;]nth<cm1>] }}} )</$list><br>
    </$let>
  </$list>
</$let>
#3

I thought about it a bit more and I think the easier way would be to filter first for the date:

<$list filter="[tag[Task]Einteilung[Monat]sort[Fällig]]+[unique[Fällig]]">

<$view field="Fällig" format=date template="mmm YY" /><br>

</$list>

The result looks like this:

Feb 25

Feb 25

Feb 25

Mar 25

Mar 25

Mar 25

Mar 25

Mar 25

May 25

Sep 25

Dec 26

Dec 28

I hoped to get rid of the duplicates with +[unique[Fällig]], but this didn’t work. Is it the wrong operator?

Thanks in advance,
Ben

#4

unique does not take a parameter. But if you want a list of all Fällig parameters, you can use map first. It might look like this (untested):

<$list filter="[tag[Task]Einteilung[Monat]] :map[get[Fällig]] +[unique[]sort[]]">

<<currentTiddler>>

</$list>

You might also investigate the each operator.