https://servicios.abclatino.com/wp-content/themes/Corsa/js/jquery.parallax.js?ver=1.8.6

1/*
2 Plugin: jQuery Parallax
3 Version 1.1.3
4 Author: Ian Lunn
5 Twitter: @IanLunn
6 Author URL: http://www.ianlunn.co.uk/
7 Plugin URL: http://www.ianlunn.co.uk/plugins/jquery-parallax/
8
9 (Contains lots of UpSolution's modifications)
10
11 Dual licensed under the MIT and GPL licenses:
12 http://www.opensource.org/licenses/mit-license.php
13 http://www.gnu.org/licenses/gpl.html
14 */
15
16(function( $ ){
17	var $window = $(window),
18		windowHeight = $window.height();
19
20	$.fn.parallax = function(xpos, baseSpeedFactor, outerHeight){
21		var $this = $(this),
22			speedFactor,
23			offsetFactor = 0,
24			getHeight,
25			topOffset = 0,
26			containerHeight = 0,
27			containerWidth = 0,
28			// Disable parallax on certain screen/img ratios
29			disableParallax = 0,
30			// Base image width and height (if can be achieved)
31			baseImgHeight = 0,
32			baseImgWidth = 0,
33			// Backgroud-size cover? and current image size (counted)
34			isBgCover = ($this.css('background-size') == 'cover'),
35			curImgHeight = 0;
36
37		if ($this.length == 0) return;
38
39		// setup defaults if arguments aren't specified
40		if (arguments.length < 1 || xpos === null) xpos = "50%";
41		if (arguments.length < 2 || baseSpeedFactor === null) baseSpeedFactor = 0.61;
42		if (arguments.length < 3 || outerHeight === null) outerHeight = true;
43
44		if (outerHeight){
45			getHeight = function(jqo){
46				return jqo.outerHeight(true);
47			};
48		} else {
49			getHeight = function(jqo){
50				return jqo.height();
51			};
52		}
53
54		// Count background image size
55		function getBackgroundSize(callback){
56			var img = new Image(),
57			// here we will place image's width and height
58				width, height,
59			// here we get the size of the background and split it to array
60				backgroundSize = ($this.css('background-size') || ' ').split(' ');
61
62			// checking if width was set to pixel value
63			if (/px/.test(backgroundSize[0])) width = parseInt(backgroundSize[0]);
64			// checking if width was set to percent value
65			if (/%/.test(backgroundSize[0])) width = $this.parent().width() * (parseInt(backgroundSize[0]) / 100);
66			// checking if height was set to pixel value
67			if (/px/.test(backgroundSize[1])) height = parseInt(backgroundSize[1]);
68			// checking if height was set to percent value
69			if (/%/.test(backgroundSize[1])) height = $this.parent().height() * (parseInt(backgroundSize[0]) / 100);
70
71			if (typeof width != 'undefined' && typeof height != 'undefined'){
72				// Image is not needed
73				return callback({ width: width, height: height });
74			}
75
76			// Image is needed
77			img.onload = function () {
78				// check if width was set earlier, if not then set it now
79				if (typeof width == 'undefined') width = this.width;
80				// do the same with height
81				if (typeof height == 'undefined') height = this.height;
82				// call the callback
83				callback({ width: width, height: height });
84			};
85			// extract image source from css using one, simple regex
86			// src should be set AFTER onload handler
87			img.src = ($this.css('background-image') || '').replace(/url\(['"]*(.*?)['"]*\)/g, '$1');
88		}
89		function update(){
90			if (disableParallax)
91				 return $this.css('backgroundPosition', '');
92			if (isNaN(speedFactor))
93				return;
94
95			var pos = $window.scrollTop();
96			topOffset = $this.offset().top;
97			// Check if totally above or totally below viewport
98			if ((pos < topOffset - windowHeight) || (topOffset + containerHeight < pos)) return;
99			$this.css('backgroundPosition', xpos + " " + (offsetFactor + speedFactor * (topOffset - pos)) + "px");
100		}
101		function resize(){
102			setTimeout(function(){
103				windowHeight = $window.height();
104				containerHeight = getHeight($this);
105				containerWidth = $this.width();
106				if (isBgCover){
107					if (baseImgWidth / baseImgHeight <= containerWidth / containerHeight){
108						// Resizing by width
109						curImgHeight = baseImgHeight * ($this.width() / baseImgWidth);
110						disableParallax = 0;
111					}
112					else {
113						disableParallax = 1;
114					}
115				}
116				// Improving speed factor to prevent showing image limits
117				if (curImgHeight !== 0){
118					if (baseSpeedFactor >= 0) {
119						speedFactor = Math.min(baseSpeedFactor, curImgHeight / windowHeight);
120						offsetFactor = Math.min(0, .5 * (windowHeight - curImgHeight - speedFactor * (windowHeight - containerHeight)));
121					} else {
122						speedFactor = Math.max(baseSpeedFactor, -(curImgHeight / windowHeight));
123						offsetFactor = Math.min(0, 0.5 * (-windowHeight + curImgHeight + speedFactor * (-windowHeight + containerHeight)));
124					}
125
126
127				}else{
128					speedFactor = baseSpeedFactor;
129					offsetFactor = 0;
130				}
131				update();
132			}, 10);
133		}
134

135		getBackgroundSize(function(sz){
136			curImgHeight = baseImgHeight = sz.height;
137			baseImgWidth = sz.width;
138			resize();
139		});
140
141		$window.bind({scroll: update, load: resize, resize: resize});
142		resize();
143	};
144})(jQuery);