Ok I got it.
I used

$('#mySelect').select2().trigger('change');   

instead of

$('#mySelect')....

I think I've identified the issue. On my page I use Select2

<link href="https://cdn.jsdelivr.net...

Here is my form:

{{ form_ajax('onFilterMembers', {flash: ''}) }}

    <select name="licence_type" cl...

Thanks for your reply, it saves me a couple of extra hours of investigation.
Is it safe to update to...

I've reproduced the exact same code but I still have the same problem.
What can I do ?

the form:

{{ form_ajax('onExport', {flash: ''}) }}
      <button type="submit" class="btn btn-inf...

Ok I got it now. It's explained here: https://github.com/octobercms/october/issues/3655
Since I'm th...

My form:

{{ form_ajax('onUpdate') }}
    <input type="text" name="first_name" value="{{ profile.firs...

I'd like to use the FileUpload widget for one of my component's forms. I noticed there is a dedicate...

I think I got it.
It's actually very subtle.

Deletes only the model.

$data = post();
$member->attes...