fine uploader - Fineuploader validate first time second time skips validation -

i have given ajax call check duplicatefile name in database wan each file name unique , on return returning false if there duplicate file name.

this works first time when try upload same file again uploads without calling validation event. not using validationbatch event.

 onvalidate: function(data, btnname) {                 var filename = data.name;                 //duplicate file name check                 var result = $.ajax({                     type: "get",                     url: '../referredfieldselector/checkduplicatefilename?filename=' + filename,                     async: false,                     cache:false                 }).responsetext;                 if (result == 'true') {                     showduplidatefilepopup(filename);                     return false;                 }             } 

anything wrong ?

also using itemlimit option in validation restrict no of files getting alert 2 times each time when item exceeds itemlimit.