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Arcade Expressions を使用してポップアップに添付ファイルを表示する

JenniferBell

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ArcGIS Onlineでは、フィーチャレイヤーに画像を添付ファイルとして保存できます。デフォルトでは、添付ファイルはポップアップにハイパーリンクとして表示されます。わずか数行のArcade式を使うだけで、閲覧者がリンクをクリックしなくても実際の画像をポップアップに表示するように設定できます。<\/P>

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2019年3月のArcGIS Onlineリリースにより、ジオタグ付き写真をアップロードして各画像の位置のポイントフィーチャレイヤーを作成できるようになりました。このブログでは、レイヤーの作成方法とジオタグ付き写真をポップアップに表示する手順を説明します。以下のビデオは、写真の追加とポップアップの編集方法を示しています（ステップバイステップの手順は下記にあります）：<\/P>

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KevinMayall_COH

"4. Click the field when it appears and select the Calculate option with Arcade."

Not seeing an option to use Arcade in ArcGIS Online Calculate. The calculator seems to want a SQL expression.

KellyGerrow

Check out this blog by Paul Barker‌ for more information about the attachments function with arcade:

Visualize your attachments in ArcGIS Online with Arcade

KellyGerrow

Hi Kevin,

Calculating fields with Arcade is not supported for feature layers that have sync enabled or are configured to track who created and updated features.

Calculate field values—ArcGIS Online Help | ArcGIS

Is this the case for your data? Are you able to modify any of the settings or are they required for your workflow?

-Kelly

Anneka_France

I'm getting the error "Runtime Error: Cannot call member method on null."

Is this because some features don't have an image attached?

KevinMayall_COH

Hi Kelly,

Thank you! Once I disabled sync, the Arcade option was there.

Kevin

KellyGerrow

Can you share your expression?

-Kelly

KevinMayall_COH

I think so. I get it too after it processes my first record with attachments, then gives an error on the second record with no attachments. Probably needs a condition test, but I haven't got it working yet.

JenniferBell

Thanks for your comments. You're right that the null error is due to not having an attachment in one or more of the features, and that a condition test is a possible solution to this issue.

Here's one way to address features that do not have attachments:

1. Open the layer with attachments in the map viewer.
2. Open the layer table and add a CountAttachments field and calculate it with the Arcade Expression:
Count(Attachments($feature))
3. Filter the layer to show:

      CountAttachments is greater than 0
4. Add an AttachID field and calculate it with the Arcade Expression:
      First(Attachments($feature)).ID
5. Remove the filter.
6. Configure the Arcade Expression in the pop-up to include the conditional statement. The When statement is read as "When the count of attachments is greater than zero, return the URL string. For all else (count less than or equal to zero), return null (or nothing)."
      var Part1 =       "https://services.arcgis.com/5uh3wwYLNzBuU0Eu/arcgis/rest/services/JoshuaTreeHike/FeatureServer/0/"
      var ObjectID = $feature.OBJECTID
      var Part2 = "/attachments/"
      var AttachID = $feature.AttachID
      When($feature.CountAttachments > 0, Part1 + ObjectID + Part2 + AttachID, null)
7. Add an image to the pop-up and set the expression as the URL.

JosephKerski

I am looking forward to sharing this with the education community - at the moment I cannot get past the step where I calculate the Arcade expression - I am using return First(Attachments($feature)).ID but I am getting the error "unable to append data". When I first enter the expression and "test" - I do get a "1" returned so it seems like the expression is valid.

JenniferBell

Hi Joseph, were you able to get the expression working?

ZandBakhtiari1

https://community.esri.com/community/gis/web-gis/arcgisonline/blog/2019/03/22/show-attachments-in-pop-ups-with-arcade-expressions‌ Does this work with Map Services that are not hosted on AGOL? For example a Map Service from a ArcGIS Server (non federated) that has been published with attachments.

KellyGerrow

HI Zand,

Currently the attachment function in Arcade is only available with the calculate feature tool with hosted feature layers. You may be able to look into Jake Skinner's post about to perform the same steps with a Geoprocessing tool although i haven't tried this with non-hosted feature services.

Show Attachments in Web Map Popup‌

-Kelly

AutumnMason

I have a feature service with attachments that I am trying to get this to work with. It does not have syncing enabled, and I went ahead and made it public like the workflow mentions. I am getting stuck on the very first line of the Arcade Expression, var Part1= "myservicename.../FeatureServer/1/", when I continue to get a red x with the message, "Parse Error:Line5: Unexpected token ILLEGAL". Any help figuring this out is much appreciated.

KellyGerrow

In order to access the attachments, the feature layer must be shared publicly. Is there anything preventing you from sharing this publicly?

AutumnMason

It is shared publicly, I am an AGOL admin within my organization.

KellyGerrow

can you share a link to the layer?

JoeBorgione

For other Arcade newbies like myself, here is a post of mine that describes my experience.

Many thanks to Kelly Gerrow‌ and Jennifer Bell (sorry there are three Jennifer Bells...) and my friend and colleague Rachel Manko who is the best trainer of old dawgs learning new tricks I know!

JoeBryant1

The hosted feature service I'm trying to add pop-up pictures to is used by our staff in Collector. I can't share this publicly because it is editable. However, I made a View of the layer without editing rights that I have made public.

When I try to calculate the Attachment ID as described above on this public view, I get: "Execution Error:Runtime Error: Cannot call member method on null. ID". (Yes, I filtered out all rows without attachments first). This is the same error I get when trying to calculate on the non-public parent feature service.

Does this make sense? Can I not access the attachment ID because the editable parent feature service of the view is not shared publicly?

KellyGerrow

Hi Joe,

I just ran through a similar workflow and am not experiencing any issues where the sharing privileges of both the primary layer and view layer are different. Can you verify that you are calculating the field on the public layer? I would also suggest getting in touch with Tech Support.

RyanWoehl

I have run through the workflow and now i'm getting "Token Required" Error, when I test to see the attachment. I don't/can't have the feature shared publicly. Is that causing the error?

KellyGerrow

HI Ryan,

In order to use this workflow, the feature layer must be public. For testing purposes you can append a token to the image url, but this has security implications and requires updating of the token if it were to be used as a production workflow. For now, I would only recommend following this workflow with public layers.

-Kelly

RyanRish

Hello all,

Will this procedure work with attachments from Survey123?

The URLs for the attachments have tokens. So, for example the file name for the attachment in the data table is: 2019-04-09 10.02.22.jpg

And, the URL is: "https://services4.arcgis.com/88rfrrytOLWa0xax/arcgis/rest/services/survey123_50d1bb44f2fe4e95a8bd5b01c1b91ae8/FeatureServer/0/2/attachments/2?token=JEDswBS0Y6oEAdD5EhSgNn

Any advice on how to make this work?

Thank you,
Ryan

JenniferBell

Here is a map of your test data showing how to do this. Click Modify Map in the top right, then open the layer's pop-up configuration to view the expression.

If your object ID and attachment ID are the same, you can use the following code for your expression:

var Part1 = "https://services4.arcgis.com/88rfrrytOLWa0xax/arcgis/rest/services/survey123_50d1bb44f2fe4e95a8bd5b01c1b91ae8_fieldworker/FeatureServer/0/"
var ObjectID = $feature.ObjectId
var Part2 = "/attachments/"
var AttachID = $feature.ObjectId
Part1 + ObjectID + Part2 + AttachID

However, if the object ID and attachment ID are different, then I would add a countAttachments field (Part 1, Step 3) and an AttachID field (Part 1, Step 5) and use the Arcade expression format in Part 2.

RyanRish

Thank you so much. I've been trying to figure this out for a while, and I was over complicating it. I copied what you had in your popup configuration without adding any fields and it worked! Thanks again!!

-Ryan

James_Armstrong

Hey Kelly,

I wonder if the reason you gave above is also relevant to my not being able to add a field. That option does not appear anywhere. I am using Portal, but should that matter?

James

James_Armstrong

Nice article. Do you know if there is a class or webinar on using ARCADE. I am speaking more of a deeper dive that I have seen on internet so far. Perhaps I am missing something that is already there.

Thanks

James

JenniferBell

Hi James. I don't know of any upcoming webinars, but we just had the User Conference in July where there were lots of recorded tech workshops. Until they become available, here are some videos from last year: https://www.youtube.com/results?search_query=arcade+expression+esri

I also just released this story describing everything I shared during an Arcade workshop I gave a couple weeks ago at the conference. There are lots of additional links at the end of it: https://storymaps.arcgis.com/stories/2f65e766a5864a37a44a598d585f80b2

James_Armstrong

This is awesome. Thank you!

James

James_Armstrong

Jennifer, Thanks so much for posting this as I have an application that needs it badly. I followed the instructions and actually got it to work. Beautiful. One thing though....I notice that when I click on the picture (actually right click) there is an option to open the photo in a new browser tab. I like this, however, for some reason, when I click on a picture in my app, all I get is a download request. Im not sure it is something with the script, but have you seen or heard of this before, and if so, would you have a suiggestion on what I might try so that the phot opens in a browser? (Chrome, IE, Firefox and Edge)

Thanks

James Armstrong

JenniferBell

Hi James, I'm glad it worked for you. Do you have a url to your app that you could share?

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