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list element selection when element number is an attribute value

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  • September 14, 2016
  • 4 replies
  • 61 views
helmoet
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Hi guys,

It's allmost to simple to imagine that no-one else has thought of this, but when I try to access the elements of a list from an attributecreator, the only possible choices are numbers from 0 to .... for the selection of an individual item of the list. Wouldn't it be a great idea to enable also an attribute reference for a number? So there is an attribute _list_index that I can select as the element sequence number for the element to select? Like the ListIndexer, so one does not have to use that transformer anymore, too.

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4 replies

david_r
Celebrity
  • david_rCelebrity
  • September 14, 2016

You can still do it, although it's a bit of a mouthful to type in manually:

my_list{@Value(my_index)}.item

I agree it would be more elegant to be able to select it from the the dialog.

tim_wood
Contributor
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  • tim_woodContributor
  • Contributor
  • May 4, 2018

Just had this exact scenario:

https://knowledge.safe.com/questions/69573/pointonareaoverlayer-fails-for-some-points-which-a.html

Thanks @david_r

tim_wood
Contributor
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  • tim_woodContributor
  • Contributor
  • May 4, 2018
Note from Safe: We had to turn off the formatting in this comment due to the community migration. In 2017.1.1.1 the correct syntax needs to be:

 

@Value(my_list{@Value(my_index)}.item)

 

tim_wood
Contributor
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  • tim_woodContributor
  • Contributor
  • June 22, 2018

This may also be helpful...

https://knowledge.safe.com/questions/68957/get-the-last-index-of-an-array.html

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