https://www.almustafatrust.org/wp-content/themes/al-mustafa-welfar…/widget-scroll-navigation.js?ver=1.0

1"use strict";
2
3i3.use({
4	"object": ""
5});
6
7i3.object.extend({
8	__name__: "i3-widget-scroll-navigation",
9    
10	__constructor__: function (self, params)
11	{
12		var component = this;
13        
14        params = i3.extend(true, {
15            offsets: {},
16            
17            "class": {
18                up: "",
19                down: ""
20            },
21            
22            __scrollTop__: i3(window).scrollTop()
23        }, params);
24        
25        // if any of the offsets are defined as being 'auto' then we will
26        // need to go around and figure out what the offsets should be; for
27        // the interests of simplicity we will declare that anything that is
28        // 'auto' is the position of the element, relative to the top of the
29        // document.
30        for(var i in params.offsets)
31        {
32            var matches = undefined;
33            
34            if(typeof params.offsets[i] == "string")
35            {
36                if((matches = params.offsets[i].match(/^top(?:\s*([+-])\s*(\d+))?$/)))
37                {
38                    params.offsets[i] = this.node().position().top;
39                    
40                    if(matches[1] !== undefined && matches[2] !== undefined)
41                    {
42                        if(matches[1] == "+")
43                            params.offsets[i] += parseInt(matches[2]);
44                        else if(matches[1] == "-")
45                            params.offsets[i] -= parseInt(matches[2]);
46                    }
47                }
48                else if((matches = params.offsets[i].match(/^bottom(?:\s*([+-])\s*(\d+))?$/)))
49                {
50                    params.offsets[i] = this.node().position().top + this.node().outerHeight();
51                    
52                    if(matches[1] !== undefined && matches[2] !== undefined)
53                    {
54                        if(matches[1] == "+")
55                            params.offsets[i] += parseInt(matches[2]);
56                        else if(matches[1] == "-")
57                            params.offsets[i] -= parseInt(matches[2]);
58                    }
59                }
60            }
61        }
62        
63        this.params(params);
64	},
65    
66    __init__: function()
67    {
68        var component = this;
69        
70        i3(window).on('scroll', function(){
71            component.__event__()
72        }).trigger('scroll');
73    },
74    
75	__event__: function(event)
76	{
77        var params = this.params();
78        var node = this.node();
79        
80        if (params['class'].up != params['class'].down)
81        {
82            if (params.__scrollTop__ > i3(window).scrollTop())
83                i3(node).addClass(params['class'].up).removeClass(params['class'].down);
84            else
85                i3(node).addClass(params['class'].down).removeClass(params['class'].up);
86        }
87            
88        params.__scrollTop__ = i3(window).scrollTop();
89            
90        for (var i in params.offsets)
91        {
92            if (i3(window).scrollTop() > parseInt(params.offsets[i]))
93                i3(node).addClass(i);
94            else
95                i3(node).removeClass(i);
96        }
97	}
98});