Arcade expression for pop-up attachment

[Rémi]

Hi, I found in this post https://community.esri.com/t5/arcgis-online-blog/show-attachments-in-pop-ups-with-arcade/ba-p/890588 how to display the first attachment. I'd like to view the other attachments by retrieving the list of attachment identifiers using arcade to calculate a new field:

//calculate the attach IDs field
function IDs(f){
return f.ID;
}

var Attach_ = Attachments($feature);
var AttachIDs = Map(Attach_, IDs);
return Concatenate(AttachIDs,',');

I don't understand why this isn't working. Can you help me?

Thanks,

[jcarlson]

Hard to say why it isn't working. Try adding a couple Console statements to see what each step is doing, as that can identify where the process is breaking down.

/calculate the attach IDs field
function IDs(f) {
  return f.ID;
}

var Attach_ = Attachments($feature);
Console(Text(Attach_));
var AttachIDs = Map(Attach_, IDs);
Console(Text(AttachIDs))
return Concatenate(AttachIDs,',');

[Rémi]

Thank you for your reply. I get the following error : invalid expression. Error on line 8 Unknown function

[jcarlson]

Are you running this expression in ArcGIS Enterprise? Map was introduced at 11.0, so if you're on an earlier version, you won't have access to it.

[Rémi]

Unfortunately, I'm in version 10.9!

I don't know how i can retrieve attachment identifiers...

Thanks,

[jcarlson · Accepted solution]

You can do it with a simple loop, no need to use Map (though it would make for more concise code).

var atts = Attachments($feature)
var ids = []

// loop through attachments and get the ids
for (var a in atts) {
  Push(ids, atts[a]['ID'])
}

return Concatenate(ids, ', ')

[Rémi]

Thanks a lot for your help