jquery - Cannot get isotope to sort by number -

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i'm trying isotope sort number in p.number (one p.number inside each div.box) , of div.box inside #content (my jquery below build markup) right of div.box divs stacking on top of each other --- want when when click on button, div.box sort number found in p.number tag

this error in web console: typeerror: '.number parseint' not function (evaluating 'ea')

<body>     <div class="wrapper">         <div id="sorts">             <button>sort number</button>         </div>         <div id="content">         </div>      </div>      <script>                  var mydata = [     {         "number" : "15",          "promoimage_title" : "title here item 1"     },     {         "number" : "28",         "promoimage_title" : "title here item 2"     },     {         "number" : "58",         "promoimage_title" : "title here item 3"     },     {         "number" : "37",         "promoimage_title" : "title here item 4"     },     {         "number" : "4",         "promoimage_title" : "title here item 5"     },     {         "number" : "8",         "promoimage_title" : "title here item 6"     },     {         "number" : "23",          "promoimage_title" : "title here item 7"     },     {         "number" : "88",         "promoimage_title" : "title here item 8"     },     {         "number" : "27",         "promoimage_title" : "title here item 9"     },     {         "number" : "67",         "promoimage_title" : "title here item 10"     }  ];           $.each(mydata, function(index, value) {                 $('#content').append("<div class='box'><p class='number'>"+value.number+"</p><p class='box-title'>"+value.promoimage_title+"</p></div>");         });          var $container = $('#content');                             $container.isotope({             itemselector: '.box',             layoutmode: 'masonry',             getsortdata: {               number: '.number parseint'             }           });            $('#sorts').on( 'click', 'button', function() {             $container.isotope({ sortby: 'number' });         });       </script> </body>


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