https://www.txrea.com/jmc-assets/global-js/hoverIntent.js

1(function($){
2	/* hoverIntent by Brian Cherne */
3	$.fn.hoverIntent = function(f,g) {
4		// default configuration options
5		var cfg = {
6			sensitivity: 7,
7			interval: 100,
8			timeout: 0
9		};
10		// override configuration options with user supplied object
11		cfg = $.extend(cfg, g ? { over: f, out: g } : f );
12
13		// instantiate variables
14		// cX, cY = current X and Y position of mouse, updated by mousemove event
15		// pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
16		var cX, cY, pX, pY;
17
18		// A private function for getting mouse position
19		var track = function(ev) {
20			cX = ev.pageX;
21			cY = ev.pageY;
22		};
23
24		// A private function for comparing current and previous mouse position
25		var compare = function(ev,ob) {
26			ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
27			// compare mouse positions to see if they've crossed the threshold
28			if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) {
29				$(ob).unbind("mousemove",track);
30				// set hoverIntent state to true (so mouseOut can be called)
31				ob.hoverIntent_s = 1;
32				return cfg.over.apply(ob,[ev]);
33			} else {
34				// set previous coordinates for next time
35				pX = cX; pY = cY;
36				// use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
37				ob.hoverIntent_t = setTimeout( function(){compare(ev, ob);} , cfg.interval );
38			}
39		};
40
41		// A private function for delaying the mouseOut function
42		var delay = function(ev,ob) {
43			ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
44			ob.hoverIntent_s = 0;
45			return cfg.out.apply(ob,[ev]);
46		};
47
48		// A private function for handling mouse 'hovering'
49		var handleHover = function(e) {
50			// next three lines copied from jQuery.hover, ignore children onMouseOver/onMouseOut
51			var p = (e.type == "mouseover" ? e.fromElement : e.toElement) || e.relatedTarget;
52			while ( p && p != this ) { try { p = p.parentNode; } catch(e) { p = this; } }
53			if ( p == this ) { return false; }
54
55			// copy objects to be passed into t (required for event object to be passed in IE)
56			var ev = jQuery.extend({},e);
57			var ob = this;
58
59			// cancel hoverIntent timer if it exists
60			if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); }
61
62			// else e.type == "onmouseover"
63			if (e.type == "mouseover") {
64				// set "previous" X and Y position based on initial entry point
65				pX = ev.pageX; pY = ev.pageY;
66				// update "current" X and Y position based on mousemove
67				$(ob).bind("mousemove",track);
68				// start polling interval (self-calling timeout) to compare mouse coordinates over time
69				if (ob.hoverIntent_s != 1) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );}
70
71			// else e.type == "onmouseout"
72			} else {
73				// unbind expensive mousemove event
74				$(ob).unbind("mousemove",track);
75				// if hoverIntent state is true, then call the mouseOut function after the specified delay
76				if (ob.hoverIntent_s == 1) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );}
77			}
78		};
79
80		// bind the function to the two event listeners
81		return this.mouseover(handleHover).mouseout(handleHover);
82	};
83	
84})(jQuery);