On the same principle as the default bulk edit of the Nuxeo Platform, the DAM Compat module offers a bulk edit form that allows to edit several assets at the same time, with a form adapted to assets relevant metadata.
Customizing the Bulk Edit Form
The default bulk edit form is based on a layout called [email protected]. To change it you just need to override the default one by your own [email protected] layout to display your own widgets.
Default DAM bulk edit layout
<require>org.nuxeo.dam.layouts</require>
<extension target="org.nuxeo.ecm.platform.forms.layout.WebLayoutManager"
point="layouts">
<layout name="[email protected]">
<templates>
<template mode="any">/layouts/layout_bulkedit_template.xhtml</template>
</templates>
<rows>
<row>
<widget>dam_edit_tags</widget>
</row>
<row>
<widget>damc_author</widget>
</row>
<row>
<widget>damc_authoringDate</widget>
</row>
<row>
<widget>subjects</widget>
</row>
<row>
<widget>coverage</widget>
</row>
</rows>
</layout>
</extension>
The widgets used in the [email protected] layout should not have the property required set to true. If the widgets you want to use have this property, redefine them in the layout without the required property.