Ajax file upload in Wordpress - can't pass FormData

Question

I\'ve made a script which uses $.ajax and FormData to pass two form objects to PHP. One form object is a text and the other is a file. It worked well as a stand-alone script

Answer 1

here some modified code in case you have multiple data and multiple files

var fd = new FormData();
var data = jQuery('#yourformID').serializeArray();
jQuery.each(data,function(key,input){
    fd.append(input.name,input.value);
});
var file = jQuery(document).find('input[type="file"]');
jQuery.each(jQuery(file), function(i, obj) {
    jQuery.each(obj.files,function(j,file){
        fd.append('files[' + j + ']', file);
    })
});
fd.append('action', 'fiu_upload_file');