javascript - Append data to formData object -

i seem not additionally data added "formdata".

first add input file:

var form = $('#uploadform')[0]; var formdata = new formdata(form);  var input = $("#uploadphoto")[0]; //add input file data formdata formdata.append(input.name, input.files[0]); 

this works fine.
, php var_dump after "ajax call" results:

array(1) {   ["uploadphoto"]=>   array(5) {     ["name"]=>     string(5) "1.xls"     ["type"]=>     string(24) "application/vnd.ms-excel"     ["tmp_name"]=>     string(40) "..../tmp/phpmyn3e1"     ["error"]=>     int(0)     ["size"]=>     int(42799)   } } 

now i'd add data passing on php script:

formdata.append('usr', selectedusr); formdata.append(input.name, selectedusr); formdata.append('usr', 'usr: '+ selectedusr); 

when check php var_dump, there no "usr" data in array.
why?

i think checking $_files , check post data print_r($_post)