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DamUploadFieldDefinition renders a field for uploading files into a Magnolia workspace. This field is used by the Assets app for uploading assets into the dam workspace. It extends the basic upload field field and adds the following enhancements to the completed view:

  • The uploaded file is mapped to a media type based on its MIME type.
  • The default field labels are overridden with Media type specific labels such as Upload new image.
  • Actions for editing images in the media editor.
  • Actions for previewing images.
  • Thumbnail preview.


fieldType: damUpload

Here's the completed view for an uploaded image.

Here's the completed view for an uploaded video.

DAM upload field properties

Simple DAM upload field configuration:

    - name: tabUpload
      label: Upload
        - name: upload
          fieldType: damUpload
          label: Upload asset
          binaryNodeName: jcr:content
          editFileName: true

Node name












Upload asset



See Referencing fields for further information.

You can use common field properties and the properties in the tables below in a basic upload field definition:


<field name>


Name of the field.


optional, default is .* (all types)

Regular expression to filter allowed files by their MIME type. For example, to allow only Excel files set the value to application.*(excel|xls). To allow images only, set the value to image.*. For more information about the supported pattern, see Pattern . For digital asset management MIME types see MediaType.


optional, default is binaryNodeName

Name of the subnode that will contain the file binary and related information.


optional, default is false

When set to true, the file extension displayed in the Format field is editable.


optional, default is false

When set to true, the file name displayed in the Name field is editable.


optional, default is 2^63 (9.2 EB)

Maximum file size in bytes.

Caption properties. Values are typically retrieved from a message bundle.

<field name>


Name of the field

Empty view


optional, default is or <em>drag a file into this area</em> to upload it

Text displayed as label for dropping invitation.


optional, default is Select a file to upload...

Text displayed as tooltip on the upload button.


optional, default is You have aborted the upload of your file

Text displayed in the warning note.

In progress view


optional, default is Uploading file {0} ...

Text displayed as title.


optional, default is {0} of {1} uploaded

Text displayed as file upload ratio.

Completed view


optional, default is or <em>drag a file into this area</em> to upload it

Text displayed as label for dropping invitation.


optional, default is An Error occurred while uploading your file

Text displayed in the error note.


optional, default is Format

Text displayed as file format label.


optional, default is File detail

Text displayed as file detail header.


optional, default is Name

Text displayed as file name label.


optional, default is Size

Text displayed as file size label.


optional, default is Source

Text displayed as file source label.


optional, default is Upload a new File...

Text displayed on the upload button.


optional, default is A file size limitation

Text displayed in the warning when file size > maxUploadSize


optional, default is Your file has been uploaded successfully

Text displayed in the success note.


optional, default is An unsupported upload file type

Text displayed in the warning when file type not in allowedMimeTypePattern


optional, default is A user action

Text displayed in the warning when the user interrupts the upload.

Caption properties specific to the DAM upload field.

<field name>


Name of the field


optional, default is Edit image...

Text displayed as tooltip when you hover over the edit action icon.


optional, default is View in lightbox...

Text displayed as tooltip when you hover over the preview action icon.

Common field properties:





Defines the field type via either a field alias name or a fully-qualified field definition class name. See Field definition: Field types

Use the Definitions app to check the correct form of the name.



Pre-filled default value displayed in the field. The value can be overwritten by the user. Use alphanumeric characters.

(info) Applied only when creating a new item, not for already existing items.



Help text displayed when the user clicks the help icon. The value can be literal or retrieved from the message bundle with a key such as products.product.description. Use alphanumeric characters in literal values. Not applicable to the Static field.


optional, default is false

Enables i18n authoring support which allows editors to write foreign-language or regionally targeted content. A two-letter language identifier (en, de, fr etc.) is displayed on controls where i18n is set to true.


optional, default is the message bundle defined in the dialog definition

Message bundle such as com.example.messages for localized field labels. You can set this property in the parent dialog, form or tab definition. Child fields will inherit the bundle.



Field label displayed to editors. The value can be literal such as Product name or retrieved from the message bundle with a key such as products.product.label. Use alphanumeric characters in literal values.

If you don't provide the property then Magnolia falls back to a generated i18n key and displays they key in the UI.

If you don't want a label at all then define the property and set its value to empty space such as label: " " in YAML.


optional, default is the name of the field's parent node

Name of the node where the value is saved. The name jcrName is reserved. Use alphanumeric characters.



The placeholder text to be displayed in the empty field. The property replaces the deprecated placeholder text field.

(warning) Applicable in text and link fields.

The field is optional, but you should provide a translation or a hard-coded label, otherwise the empty field will display its auto-generated 18n key instead.


optional, default is false

Makes the field uneditable. Adding this property has the same effect as creating a Static field.


optional, default is false

Makes the field required (mandatory). An asterisk is displayed next to the field label. See also Checking for null values.


optional, default is "This field is required"

Error message displayed when required is true and the user saves an empty field. The value can be literal or retrieved from the message bundle with a key such as validation.message.required.



Adds one or more style names to this component. Multiple styles can be specified as a space-separated list of style names such as checkbox disabled. The style name will be rendered as an HTML class name, which can be used in a CSS definition. The class name is added to the field by calling the Vaadin method addStyleName.



Property transformer classes define how field values are stored in the repository. Each field has a default transformer class. You don't need to define a class unless you want to override the default. The value is a fully-qualified class name.

(warning) Complex field definitions may define a different default transformer in their constructor. See Transforming field values for more.


optional, most fields set a default value automatically

PropertyType of the stored value such as String, Boolean, Date or any other supported and defined data type. 

When using the basic upload field in a composite field use the DelegatingCompositeFieldTransformer. The other transformer classes do not work.


It's possible to configure the DamUploadFieldDefinition in dialogs or other apps, but keep in mind the file will placed into the workspace for which the field has been configured. For example, if you use the field in a dialog for a component template, then that file, when uploaded using the field, would be stored in the website workspace not the dam workspace. This is the same behavior as all other fields. It's best practice, whenever possible, to keep your assets in the DAM and link to them using a link field.