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/**
 * Sort on the 'alt' tag of images in a column. This is particularly useful if
 * you have a column of images (ticks and crosses for example) and you want to
 * control the sorting using the alt tag.
 *
 *  @name Alt string
 *  @summary Use the `alt` attribute of an image tag as the data to sort upon.
 *  @author _Jumpy_
 *
 *  @example
 *    $('#example').dataTable( {
 *       columnDefs: [
 *         { type: 'alt-string', targets: 0 }
 *       ]
 *    } );
 */

jQuery.extend( jQuery.fn.dataTableExt.oSort, {
	"alt-string-pre": function ( a ) {
		return a.match(/alt="(.*?)"/)[1].toLowerCase();
	},

	"alt-string-asc": function( a, b ) {
		return ((a < b) ? -1 : ((a > b) ? 1 : 0));
	},

	"alt-string-desc": function(a,b) {
		return ((a < b) ? 1 : ((a > b) ? -1 : 0));
	}
} );