Problem with Setting Sequential Values in "Comments" Parameter Using Element.SetParameterByName in Dynamo

[krzysiektoja]

Hello,

I’m encountering an issue with assigning sequential values to a parameter for multiple elements. Here’s the situation:

1. I have two lists:

• List 1: Contains 278 door elements from the Revit model.
• List 2: Contains 278 names (text values) that I want to assign sequentially to the “Comments” parameter of the doors.

2. I’m using the Element.SetParameterByName node with the “Lacing” set to Longest, expecting each value from List 2 to be assigned to the corresponding door in List 1.

The problem: Instead of assigning the values sequentially (e.g., Name 1 to Door 1, Name 2 to Door 2, etc.), Dynamo assigns the same value (the first value from List 2) to all the doors in List 1.

What I expect: Each door should get a unique value from List 2 in the same order as they appear in the lists.

Has anyone experienced a similar issue or knows how to correctly map the values so that they are applied sequentially to each element? I would appreciate any suggestions or guidance!

List1:

List2:

After running the script, all doors receive the same value in the “Comments” parameter instead of getting unique values from the list.:

Thank you in advance!

[jacob.small]

Flatten both lists. The nesting is making your life unnecessarily hard.

[krzysiektoja]

Of course, I’ve already tried flattening both lists to ensure there’s no unnecessary nesting, but the same problem persists—each door still receives the same value in the “Comments” parameter instead of unique values.

[bvs1982]

Did you also try List.Flatten with the last node back on auto or shortest.

You can also try to cycle the Parameter x times.

Though just flatten both lists (like Jacob said) should have worked. At least that was what I thought too.

[krzysiektoja]

Apologies, my mistake. The List 1 values to be written into the parameter are all the same, and the script is actually assigning them correctly.