https://martygroup.se/wp-content/themes/queeny/assets/js/parallax.min.js?ver=1.1.3

1
2/*
3 Plugin: jQuery Parallax
4 Version 1.1.3
5 Author: Ian Lunn
6 Twitter: @IanLunn
7 Author URL: http://www.ianlunn.co.uk/
8 Plugin URL: http://www.ianlunn.co.uk/plugins/jquery-parallax/
9
10 Dual licensed under the MIT and GPL licenses:
11 http://www.opensource.org/licenses/mit-license.php
12 http://www.gnu.org/licenses/gpl.html
13 */
14
15(function( $ ){
16    "use strict";
17
18    var $window = $(window);
19    var windowHeight = $window.height();
20
21    $window.on('resize', function () {
22        windowHeight = $window.height();
23    });
24
25    $.fn.parallax = function(xpos, speedFactor, outerHeight) {
26        var $this = $(this);
27        var getHeight;
28        var firstTop;
29        var paddingTop = 0;
30
31        $this.each(function(){
32            firstTop = $this.offset().top;
33        });
34      
35        if (outerHeight) {
36            getHeight = function(jqo) {
37                return jqo.outerHeight(true);
38            };
39        } else {
40            getHeight = function(jqo) {
41                return jqo.height();
42            };
43        }
44
45        if (arguments.length < 1 || xpos === null) xpos = "50%";
46        if (arguments.length < 2 || speedFactor === null) speedFactor = 0.1;
47        if (arguments.length < 3 || outerHeight === null) outerHeight = true;
48
49        function update(){
50            var pos = $window.scrollTop();
51
52            $this.each(function(){
53                var $element = $(this);
54                var top = $element.offset().top;
55                var height = getHeight($element);
56
57                if (top + height < pos || top > pos + windowHeight) {
58                    return;
59                }
60
61                $this.css('backgroundPosition', xpos + " " + Math.round((top - pos) * speedFactor) + "px");
62            });
63        }
64
65        $window.on('scroll', update).on('resize', update);
66        update();
67    };
68})(jQuery);