Although I am responding to an old post, I am having the same issue: the dropdown menus within a DataTable show an arrow, but no options when clicked. Initially, I assumed the problem was with my code (as I am dynamically assigning the dropdown_conditional property from a callback, as described here and links therein). But when I examined the relevant nodes in the Callback Graph, I could see it was being populated correctly.
From this, I assumed the problem was related to my dev environment. So I tried running the DataTable with Per-Row Dropdowns example code in the DataTable documentation.
I am seeing the same behavior with the example; the dropdowns are there, but the options don’t populate.
I found the current thread after that; I don’t know what the “Bootstrap 4” reference is to. I rebuilt my environment (running in Docker) without version constraints to try to get the latest of everything; I am running dash-bootstrap-components 1.3.1. Otherwise, I am running Python version 3.9.12 (on an Ubuntu 18 docker image), with these packages:
Package Version
------------------------- ---------
attrs 22.2.0
biopython 1.80
boto3 1.26.67
botocore 1.29.67
certifi 2022.12.7
charset-normalizer 3.0.1
click 8.1.3
dash 2.8.1
dash-bootstrap-components 1.3.1
dash-core-components 2.0.0
dash-daq 0.5.0
dash-html-components 2.0.0
dash-table 5.0.0
et-xmlfile 1.1.0
exceptiongroup 1.1.0
Flask 2.2.2
greenlet 2.0.2
gunicorn 20.1.0
idna 3.4
importlib-metadata 6.0.0
iniconfig 2.0.0
itsdangerous 2.1.2
Jinja2 3.1.2
jmespath 1.0.1
MarkupSafe 2.1.2
numpy 1.24.2
openpyxl 3.1.0
packaging 23.0
pandas 1.5.3
pip 22.0.4
plotly 5.13.0
pluggy 1.0.0
psycopg2 2.9.5
pytest 7.2.1
python-dateutil 2.8.2
pytz 2022.7.1
requests 2.28.2
s3transfer 0.6.0
setuptools 58.1.0
six 1.16.0
SQLAlchemy 2.0.2
tenacity 8.2.0
tomli 2.0.1
typing_extensions 4.4.0
urllib3 1.26.14
Werkzeug 2.2.2
wheel 0.37.1
zipp 3.12.1
Any help would be much appreciated-- Thanks!