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In ArcGIS Online popups how does one display attached images inline as an image instead of just a link? In case of multiple images I'm okay with just first one showing inline.

Under "Configure Popup" checking " Show feature attachments as links" results in text-only links. If the "Pop-up Media" control is used to add an image, it shows inline, however one has to know the URL ahead of time. The drop down selector does not show attachments as a possibility.

Desired result

Popup showing 1st image inline, hidden beneath fold are rest of attachments as links.

Going through the same difficulty, I found a semi-automated solution that works as following:

1. The popup is opened and the attachment urls load and appear as links.


2. A placeholder image (an arrow in my case) is loaded where the image will soon load.


3. Clicking the placeholder retrieves the url from the attachment link and replaces its own source url with the retrieved url, making the attachment image show.

To make it work, put the following values in the popup image configuration:

• URL: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAHCAIAAABV+fA3AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAADJJREFUeNpi+I8KFi1aBGczMWCAxYsXQxhY5ODS2OUg0jjlYmNjmXBJYDcTIgEEAAEGAGysItsbwoS/AAAAAElFTkSuQmCC
(this is just an inline image of an arrow:
  you can replace it with any other url.


• Link: javascript:void(document.getElementsByClassName("esriViewPopup")[0].getElementsByTagName("img")[0].src = document.getElementsByClassName("esriViewPopup")[0].getElementsByTagName("a")[0].href);
  this makes the link run a javascript code that makes the (first) attachment link become the image's URL.

Hope this helps.

I guess a potential workaround that would add a couple steps to your workflow would be the following:

1. Add text field [ATTACH_URL] (255 char) to the attribute table of the feature layer


2. Create a new point and upload the attachment


3. Click on the popup, then right-click and ‘Copy link address’ from the link to the attachment


4. Edit the feature, and paste this URL into the [ATTACH_URL] field
   


5. Configure the popup, and under Pop-up Media, click ADD>Image


6. Configure the popup as the following:
   

You would then have to repeat steps 3-4 every time you publish a new feature.

Not ideal or automated, but possible.

Here is a helpful GP tool that will add attachments to a pop-up:

https://geonet.esri.com/docs/DOC-7445

Another alternative is to use the new Operations Dashboard and add your web map to it. Pop-ups in the dashboard map will display all the images attached to a feature by default like in the image below:

The best way to do this is to use the "Pop-up Media" option under the "configure Pop-up" dialog within ArcGIS online for the layer you want to work with.

For the URL config you want to substitute 2 parts of the URL with OBJECTID like this bellow :

https://your.portal.url/server/rest/services/service_folder/service_name/MapServer/0/OBJECTID/attachments/OBJECTID?

This should give you the nice clean output you are expecting.