Edit feature attachments

Add, delete, and download attachments for features from a service.

Use case

Attachments provide a flexible way to manage additional information that is related to your features. Attachments allow you to add files to individual features, including: PDFs, text documents, or any other type of file. For example, if you have a feature representing a building, you could use attachments to add multiple photographs of the building taken from several angles, along with PDF files containing the building’s deed and tax information.

How to use the sample

Tap a feature on the map to open a callout displaying the number of attachments. Tap on the info button to view/edit the attachments. Select an entry from the list to download and view the attachment in the gallery. Tap on the floating action button ’+’ to add an attachment or long press to delete.

How it works

1. Create a ServiceFeatureTable from a URL.
2. Create a FeatureLayer object from the service feature table.
3. Select features from the feature layer with selectFeatures.
4. To fetch the feature’s attachments, cast to an ArcGISFeature and use ArcGISFeature.attachments.
5. To add an attachment to the selected feature, create an attachment and use ArcGISFeature.addAttachment().
6. To delete an attachment from the selected feature, use the ArcGISFeature.deleteAttachment(_:).
7. After a change, apply the changes to the server using ServiceFeatureTable.applyEdits().

Relevant API

• ArcGISFeature.deleteAttachment(_:)
• Attachments
• FeatureLayer
• ServiceFeatureTable
• ServiceFeatureTable.applyEdits()

Additional information

Attachments can only be added to and accessed on service feature tables when their hasAttachments property is true.

Tags

Edit and manage data, image, JPEG, PDF, picture, PNG, TXT