A fluid web form showcase using Bootstrap and vanilla PHP.
In this demo, you see a form that responds to input after entering it. It handles field validation and required fields.
git clone https://github.com/mevdschee/bootstrap-fluid-form.git
cd bootstrap-fluid-form
php -S localhost:8888
gnome-open http://localhost:8888
see: http://www.leaseweblabs.com/2015/05/fluid-web-forms-using-ajax/