EXT:jh_magnificpopup jquery.filter-isImageFile.js supporting EXT:jumpurl

jquery.filter-isImageFile.js

/*! jQuery :isImageFile filter - v0.0.5 - 2014-08-21
*
* Copyright (c) 2013-2018 Jonathan Heilmann;
*
* CHANGELOG
* 0.0.6:    -ignore images and links with class "excludeFromMagnificpopup"
* 0.0.5:    -ignore images with class "excludeFromMagnificpopup"
* 0.0.4:    -fixed bug #59696 (filter-isImageFile doesn't work with UpperCase Filetype)
* 0.0.3:	-removed jQuery.noConflict() and added IIFE
*			-added support for zepto
* 0.0.2:	-added jpeg to filter
* 0.0.1:	-initial release
*
*/
;(function($) {
	$.extend($.expr[':'], {
		isImageFile: function(obj){
			var $this = $(obj);
			if ($this.hasClass('excludeFromMagnificpopup')) {return false;} // Ignore images and links with class "excludeFromMagnificpopup"
			var file = $this.attr('href');
			if (file == null) {return false;} // Return false if the path is empty
			file = file.toLowerCase();	// Convert to lower case
			var extension = file.substr((file.lastIndexOf('.')+1)); // Get extension of file
      extension = extension.substr(0, (extension.lastIndexOf('&')));
			switch (extension) {
				case 'jpeg':
				case 'jpg':
				case 'png':
				case 'gif':
					// Got an image - return true
					return true;
					break;
				default:
					// No image found - return false
					return false;
			}
		}
	});
})(window.jQuery || window.Zepto);