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/**
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* Sort on the 'alt' tag of images in a column. This is particularly useful if
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* you have a column of images (ticks and crosses for example) and you want to
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* control the sorting using the alt tag.
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* @name Alt string
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* @author <i>Jumpy</i>
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*/
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jQuery.extend( jQuery.fn.dataTableExt.oSort, {
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"alt-string-pre": function ( a ) {
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return a.match(/alt="(.*?)"/)[1].toLowerCase();
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},
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"alt-string-asc": function( a, b ) {
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return ((a < b) ? -1 : ((a > b) ? 1 : 0));
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},
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"alt-string-desc": function(a,b) {
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return ((a < b) ? 1 : ((a > b) ? -1 : 0));
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}
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} );
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