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/**
* @name Parallax Background Widget for Template Creator CK
* @copyright Copyright (C) 2016. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
* @author Cedric Keiflin - http://www.template-creator.com - http://www.joomlack.fr
*/
(function($) {
var TCK_ParallaxBackground = function(container, options) {
var defaults = {
speed: '5' // speed factor
};
if (container == '#body') container = document.body;
var opts = $.extend(defaults, options);
var els = $(container);
var $window = $(window);
els.each(function() {
var el = $(this);
var bgimage = el.css('background-image');
if (bgimage == 'none' && el.find('> .inner').length) {
new TCK_ParallaxBackground(el.find('> .inner'), opts);
return;
}
el.css({
'background-position': 'center 0px',
'background-size': 'cover',
'background-attachment': 'fixed'
});
moveElement(el);
$window.bind('scroll load', function() { moveElement(el); });
$window.bind('resize', function() { moveElement(el); });
});
function moveElement(el) {
var winY = $window.scrollTop();
el.top = el.offset().top;
el.height = el.outerHeight();
// check if totally above or totally below viewport
if (
el.top + el.height < winY // bottom of element is over top of screen
|| el.top > winY + $window.height() // top of element is under bottom of screen
) {
return;
}
var bgy = - Math.round( ((winY - el.top ) ) ) - winY * opts.speed / 100;
// move the background image
el.css('background-position', "center " + bgy/10 + "px");
}
};
window.TCK_ParallaxBackground = TCK_ParallaxBackground;
})(jQuery);