javascript - FormData file, ajax doesn't post $_FILES in IE 11 -


i have following code (formdata) in javascript , it's working in mozilla , chrome. when tried in ie 11, doesn't post using ajax. success function called, $_files empty on server side.

file = _files[i][j]; if(j<_files[i].length){      if(file){     var data = new formdata();      data.append("uploadedimages", file);     console.log("formdata:"+data);     progresselement = $('#divimg_'+i+'_'+j);     progresselement.css('visibility','visible').hide().fadein('500');      $.ajax({         url: "<?php echo base_url();?>"+"upload/do_upload",         data: data,         cache: false,         contenttype: false,         processdata: false,         type: 'post',         success: function(data){             console.log(data);             j++;             if(j<_files[i].length){                 uploadmore(i,j);             }else{                 i++;                 uploadme(i,0);             }          },         xhr: function()         {             var xhr = new window.xmlhttprequest();             xhr.upload.addeventlistener( 'progress', function( e )             {                 if( e.lengthcomputable )                 {                     // append progress percentage.                     var progressvalue = ( e.loaded / e.total ) * 100;                     console.log( + ':' + progressvalue );                     progresselement.find( 'input' ).val( progressvalue ).change();                      // listen clicks on cancel icon.                     $('#stopupload').click( function()                     {                         if( progresselement.hasclass( 'working' ) )                         {                             xhr.abort();                             progresselement.fadeout(500);                         }                     });                      if( progressvalue == 100 )                     {                         progresselement.removeclass( 'working' );                     }                 }             }, false);             return xhr;         }     });       }      else{         console.log("file error!");         j++;         uploadmore(i,j);         } }


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