How to add an additional file validator

Created on 30 August 2023, about 2 years ago

Problem/Motivation

I was wondering if there is a recommended technique for a contrib module to add an additional validator to the file entity browser upload widget.

I already have this functionality working with core file and image fields, by adding the validator to the #upload_validators array when #type === 'managed_file', and would like to get this working for sites that use entity browser as well.

I tried adding my validator to $element['entity_browser']['#widget_context']['upload_validators'] but this didn't seem to work with file entity browser's dropzone upload widget.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

💬 Support request

Status

Active

Version

1.0

Component

Miscellaneous

Created by

🇺🇸United States mfb San Francisco

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Comments & Activities

Issue created by @mfb
Status changed to Postponed: needs info 14 days ago2:43pm 2 September 2025
Comment 14 days ago →
🇬🇧United Kingdom d.fisher
@mfb I'm sorry no one has replied to you. I've just become a maintainer of this module. Did you ever manage to find a solution to this? If so would you mind reporting back with the fix? If not we can look into this a bit further. Marking as postponed (maintainer needs more info) until we get a reply. Thank you!
Comment 13 days ago →
🇺🇸United States mfb San Francisco
@dfisher I still don't know how to do this. I may have missed something obvious as I don't use this module per se, was just trying to make my contrib module compatible with it.

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