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web/metronic/global/plugins/jquery.parallax.js

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+/*
+Plugin: jQuery Parallax
+Version 1.1.3
+Author: Ian Lunn
+Twitter: @IanLunn
+Author URL: http://www.ianlunn.co.uk/
+Plugin URL: http://www.ianlunn.co.uk/plugins/jquery-parallax/
+
+Dual licensed under the MIT and GPL licenses:
+http://www.opensource.org/licenses/mit-license.php
+http://www.gnu.org/licenses/gpl.html
+*/
+
+(function( $ ){
+	var $window = $(window);
+	var windowHeight = $window.height();
+
+	$window.resize(function () {
+		windowHeight = $window.height();
+	});
+
+	$.fn.parallax = function(xpos, speedFactor, outerHeight) {
+		var $this = $(this);
+		var getHeight;
+		var firstTop;
+		var paddingTop = 0;
+		
+		//get the starting position of each element to have parallax applied to it		
+		$this.each(function(){
+		    firstTop = $this.offset().top;
+		});
+
+		if (outerHeight) {
+			getHeight = function(jqo) {
+				return jqo.outerHeight(true);
+			};
+		} else {
+			getHeight = function(jqo) {
+				return jqo.height();
+			};
+		}
+			
+		// setup defaults if arguments aren't specified
+		if (arguments.length < 1 || xpos === null) xpos = "50%";
+		if (arguments.length < 2 || speedFactor === null) speedFactor = 0.1;
+		if (arguments.length < 3 || outerHeight === null) outerHeight = true;
+		
+		// function to be called whenever the window is scrolled or resized
+		function update(){
+			var pos = $window.scrollTop();				
+
+			$this.each(function(){
+				var $element = $(this);
+				var top = $element.offset().top;
+				var height = getHeight($element);
+
+				// Check if totally above or totally below viewport
+				if (top + height < pos || top > pos + windowHeight) {
+					return;
+				}
+
+				$this.css('backgroundPosition', xpos + " " + Math.round((firstTop - pos) * speedFactor) + "px");
+			});
+		}		
+
+		$window.bind('scroll', update).resize(update);
+		update();
+	};
+})(jQuery);