Waypoints is a small jQuery plugin that makes it easy to execute a function whenever you scroll to an element.

$('.entry').waypoint(function() {
   alert('You have scrolled to an entry.');
});

Read the full documentation for more details on usage and customization.

Waypoints can be used as a base for several common scroll-based UI patterns. Check out these examples of:

• Infinite Scrolling
• Sticky Elements
• Scroll Analytics

Copyright (c) 2011 Caleb Troughton Dual licensed under the MIT license and GPL license.

Waypoints has been tested* to work with jQuery versions 1.4+ in IE6+, FF3+, Safari 4+, Chrome 6+. Other browsers and jQuery versions may work fine, but this is all I've looked at so far.

* Tested in this case by my own poking around and not finding anything wrong...yet. Proper QUnit tests are in the works.

• Added $.waypoints('viewportHeight')
• Fixed iOS bug (using the new viewportHeight method)
• Added offset function alias: 'bottom-in-view'

• Initial release.

• Proper QUnit tests.
• Audit non-iOS mobile browsers.