https://www.collegeessayadvisors.com/wp-content/themes/cea/js/sticky-225.js

1jQuery(document).ready(function($){
2	//variables
3	var $window = $(window);
4	var $container = $(".sidebar-nav");
5	var $main = $(".advising-body");
6	var window_min = 0;
7	var window_max = 0;
8	var threshold_offset = 225;
9	/*
10	 set the container's maximum and minimum limits as well as movement thresholds
11	*/
12	function set_limits(){
13		//max and min container movements
14		var max_move = $main.offset().top + $main.height() - $container.height() - 2*parseInt($container.css("top") );
15		var min_move = $main.offset().top;
16		//save them
17		$container.attr("data-min", min_move).attr("data-max",max_move);
18		//window thresholds so the movement isn't called when its not needed!
19		//you may wish to adjust the freshhold offset
20		window_min = min_move - threshold_offset;
21		window_max = max_move + $container.height() + threshold_offset;
22	}
23	//sets the limits for the first load
24	set_limits();
25	
26	function window_scroll(){
27		//if the window is within the threshold, begin movements
28		if( $window.scrollTop() >= window_min && $window.scrollTop() < window_max ){
29			//reset the limits (optional)
30			set_limits();
31			//move the container
32			container_move();
33		}
34	}
35	$window.bind("scroll", window_scroll);
36	
37	/**
38	 * Handles moving the container if needed.
39	**/
40	function container_move(){
41		var wst = $window.scrollTop();
42		//if the window scroll is within the min and max (the container will be "sticky";
43		if( wst >= $container.attr("data-min") && wst <= $container.attr("data-max") ){
44			//work out the margin offset
45			var margin_top = $window.scrollTop() - $container.attr("data-min");
46			//margin it down!
47			$container.css("margin-top", margin_top);
48		//if the window scroll is below the minimum 
49		}else if( wst <= $container.attr("data-min") ){
50			//fix the container to the top.
51			$container.css("margin-top",0);
52		//if the window scroll is above the maximum 
53		}else if( wst > $container.attr("data-max") ){
54			//fix the container to the top
55			$container.css("margin-top", $container.attr("data-max")-$container.attr("data-min")+"px" );
56		}
57	}
58	//do one container move on load
59	container_move();
60});