This is an example app that uses Flask-WTF and AJAX. There are two versions of the frontend: one uses jQuery, the other uses AngularJS.
1.) Create a new virtualenv and run pip install -r requirements.txt.
2.) Run the app: python flask-manage.py
3.) Open your browser to http://127.0.0.1:5000 to view the app.
The flask-ajax.py file contains all python code, and the frontend code for the jQuery version is contained in the templates/home.html file, while the frontend code for the AngularJS version is in the templates/home-angular.html file.
Note that the AngularJS version requires the http-post-fix module in order to correct the format for POST-ed data.