Hello @Ingo_Richtsmeier,
thank for the sample code, it works now. I had to include the following libraries at the beginning of my html form file:
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
Including these libraries via the tasklist script configuration did not work, bootstrap complained that jquery was not loaded yet, but maybe I can fix this as well.
I am still wondering whether or when the tasklist will be migrated to a new JS framework as AngularJS is out of support now, see this thread: Tasklist webapp / angularjs end of life - Optimize - Camunda Platform Forum
Are there any plans regarding this?