JAVASCRIPT

html include js file flask

<script type="text/javascript"
         src="{{ url_for('static', filename='map.js') }}"></script>

where to put js files in flask

<script src="{{url_for('static', filename='somejavascriptfile.js')}}"></script>

linking javascript to Flask html

<script src="{{url_for('static', filename='somejavascriptfile.js')}}"></script>