web2py: How to execute further code after ajax call

[JPlata]

I have two dropdown/select widgets on a form. I am trying to set the options of the second select through an ajax call in jQuery, and then execute further code. The ajax call is successful and correctly sets the second select options, but it seems the code after the ajax call is not executed at all. How to correct this?

view:

{{extend 'layout.html'}}` <h1>{{=title}} /This is the library/edit_user.html template</h1> {{=grid}} <script> jQuery("#no_table_region_id").change(function(){ region_id = $(this).val(); branch_id = jQuery('#no_table_branch_id').val(); ajax("{{=URL('library', 'branches')}}" + '?region_id=' + region_id, [], 'no_table_branch_id'); jQuery('#no_table_branch_id').val(branch_id); # this does not execute }); jQuery(document).ready(function(){ // todo: solve the unsettable branch_id jQuery("#no_table_region_id").change(); }); </script>

controller:

def branches(): if request.vars.region_id: branches = db(db.branch.region_id==request.vars.region_id).select(db.branch.ALL) ops1 = ['<option value=""></option>'] ops = ops1 + [f"<option value={i['id']}>{i['branch_name']}</option>" for i in branches] else: ops = '' return ops

[Anthony]

FYI, already answered at https://stackoverflow.com/a/73338318/440323.