dynamic id dropdown selector

hello dalelotts, I have some problems when I try assign ‘id’ dinamically to data-datetimepicker-config: here’s my code

 <datetimepicker data-ng-model="RoadtripCtrl.date" 
data-datetimepicker-config="{ dropdownSelector: '#calendar-dropdown_{{$index}}',minView:'hour' }" data-on-set-time="RoadtripCtrl.selectTime(newDate, oldDate,property.id,$index)"></datetimepicker>

and here’s the error that throws: Error: Syntax error, unrecognized expression: #calendar-dropdown_{{$index}}

[Kesidi]

try data-datetimepicker-config="{ dropdownSelector: '#calendar-dropdown_' + $index, minView:'hour' }"

[dalelotts]

@Karthik-Sundaramahalingam thanks for having a look!