waypoints/src/adapters/jquery-zepto-fn-extension.js

Easily execute a function when you scroll to an element

(function() {
  'use strict'

  var Waypoint = window.Waypoint

  function createExtension(framework) {
    return function() {
      var waypoints = []
      var overrides = arguments[0]

      if (framework.isFunction(arguments[0])) {
        overrides = framework.extend({}, arguments[1])
        overrides.handler = arguments[0]
      }

      this.each(function() {
        var options = framework.extend({}, overrides, {
          element: this
        })
        if (typeof options.context === 'string') {
          options.context = framework(this).closest(options.context)[0]
        }
        waypoints.push(new Waypoint(options))
      })

      return waypoints
    }
  }

  if (window.jQuery) {
    window.jQuery.fn.waypoint = createExtension(window.jQuery)
  }
  if (window.Zepto) {
    window.Zepto.fn.waypoint = createExtension(window.Zepto)
  }
}())