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✏️ Editing: jquery.simplr.smoothscroll.js

/**
 * jquery.simplr.smoothscroll
 * version 1.0
 * copyright (c) 2012 https://github.com/simov/simplr-smoothscroll
 * licensed under MIT
 * requires jquery.mousewheel - https://github.com/brandonaaron/jquery-mousewheel/
 */

;(function ($) {
  'use strict'
  
  $.srSmoothscroll = function (options) {
  
    var self = $.extend({
      step: 55,
      speed: 400,
      ease: 'swing',
      target: $('body'),
      container: $(window)
    }, options || {})

// private fields & init
    var container = self.container
      , top = 0
      , step = self.step
      , viewport = container.height()
      , wheel = false

var target
    if (self.target.selector == 'body') {
      target = (navigator.userAgent.indexOf('AppleWebKit') !== -1) ? self.target : $('html')
    } else {
      target = container
    }

// events
    self.target.mousewheel(function (event, delta) {

wheel = true

if (delta < 0) // down
        top = (top+viewport) >= self.target.outerHeight(true) ? top : top+=step

else // up
        top = top <= 0 ? 0 : top-=step

target.stop().animate({scrollTop: top}, self.speed, self.ease, function () {
        wheel = false
      })

return false
    })

container
      .on('resize', function (e) {
        viewport = container.height()
      })
      .on('scroll', function (e) {
        if (!wheel)
          top = container.scrollTop()
      })
  
  }
})(jQuery);

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