ScrollMagic is a jQuery plugin which essentially lets you use the scrollbar like a progress bar.
It’s the plugin for you, if you want to …
– start an animation at a specific scroll position.
– synchronize an animation to the scrollbar movement.
– pin an element at a specific scroll position (sticky elements).
– pin an element for a limited amount of scroll progress (sticky elements).
– easily add a parallax effect to your website.
– create an inifinitely scrolling page (ajax load of additional content).
– call functions when the user hits certain scroll positions or react in any other way to the current scroll position.