topic Re: Arcade reference to external sources in ArcGIS Online Questions

Arcade reference to external sources

Anonymous User — Mon, 23 Nov 2020 18:48:23 GMT

Hello Community,

I need some help with this code since I am new to coding.

I have created a custom pop-up that allows me to gather information through intersecting.

Now I wanted to get to the next level-creating links with intersecting. I created two separate arcade expressions;

One for the intersection:

var intersectLayer =Intersects(FeaturesetbyName($map, "landrecords - Parcel Map"), $feature)
var results = ""
var baseweb ="http://pw.lacounty.gov/sur/nas/landrecords/parcel/PM"
for (var f in intersectLayer){
    if (results ==""){
        results = f.Reference;
    }   else{
        results += ", " + f.Reference;
    }
}
return results

One for the hyperlink:

var baseweb = "http://pw.lacounty.gov/sur/nas/landrecords/parcel/PM"
var intersectLayer = Intersects(FeaturesetbyName($map, "landrecords - Parcel Map"), $feature)

for (var f in intersectLayer){
return baseweb + MID(f.REFERENCE,2,3) + "/" + f.REFERENCE + ".pdf"
}

Results:

The result is circled in blue, however the links both send you to the same document.

Any help would be appreciated.

Thank you.

-Matthew

Re: Arcade reference to external sources

XanderBakker — Tue, 24 Nov 2020 20:42:44 GMT

Hi @Anonymous User ,

A couple of comments/questions on what you are trying to achieve:

I assume that the first expression creates the text (comma separated list of "References") and the second the hyperlink. Is that correct?
You should not use a return statement in a loop in case you want to return only the first item. Return inside a loop will return with the first element. You can use the "First" function to get the first feature from the intersection results and simply read out the attribute you need.
The hyperlink that is returned will be something like "http://pw.lacounty.gov/sur/nas/landrecords/parcel/PM345/123456789.pdf" if the reference value is "123456789". Is that the correct URL you are looking for?

Re: Arcade reference to external sources

Anonymous User — Tue, 24 Nov 2020 20:55:03 GMT

Xander,

Yes the first comment/question is correct.

The reason why I want a loop is because there are several resources/polygons stacked on one another. I want to return all of them that are within a click. I'm not sure if that answers the second statement correctly. I will try the first function and see what I come up with.

Yes, that is the correct URL I am looking for.

Re: Arcade reference to external sources

XanderBakker — Tue, 24 Nov 2020 21:20:41 GMT

Hi @Anonymous User ,

Thanks for clarifying!

You mention that you want to retrieve multiple hyperlinks since there can be multiple resources stacked on one another. A couple of things to keep in mind:

To return multiple results from a single expression, you can use the same logic as for the list of references (in each loop add a value to the result)
However, if a single text contains multiple URLs, it will not appear as valid URL in the pop-up
If each feature provides a single URL in the pop-up the fact that they are stacked does not yield any problems.

On the other hand, you mentioned earlier that you obtain the same URL for different features. I don't see a reason for this in the Arcade expression and I would first look at the data and try some different URL's manually in the browser to see what happens and that there is no redirect causing this behavior.