jquery.syncscroll.js

// Generated by CoffeeScript 1.4.0
(function() {

  jQuery.fn.syncScroll = function(elements, options) {
    var $;
    if (options == null) {
      options = {};
    }
    if (this.length < 1) {
      return;
    }
    $ = jQuery;
    return this.on('scroll', function() {
      var top;
      this.$ = $(this);
      top = this.$.scrollTop();
      return $(elements).each(function() {
        var offset, ratio, _$, _delta, _ref, _ref1, _ref2, _ref3;
        _$ = $(this);
        offset = (_ref = (_ref1 = typeof options['offset'] === "function" ? options['offset'](_$) : void 0) != null ? _ref1 : options['offset']) != null ? _ref : 0;
        ratio = (_ref2 = (_ref3 = typeof options['ratio'] === "function" ? options['ratio'](_$) : void 0) != null ? _ref3 : options['ratio']) != null ? _ref2 : 1;
        if (top >= offset) {
          _delta = (top - offset) * ratio;
          return _$.scrollTop(_delta);
        } else {
          return _$.scrollTop(0);
        }
      });
    });
  };

}).call(this);