Send FormData and String Data Together Through JQuery AJAX?

Question

How can I post file and input string data with FormData()? For instance, I have many other hidden input data that I need them to be sent to the server,

html,

<form action="image.php" method="post" enctype="multipart/form-data">
<input type="file" name="file[]" multiple="" />
<input type="hidden" name="page_id" value="<?php echo $page_id;?>"/>
<input type="hidden" name="category_id" value="<?php echo $item_category->category_id;?>"/>
<input type="hidden" name="method" value="upload"/>
<input type="hidden" name="required[category_id]" value="Category ID"/>
</form>

With this code below I only manage to send the file data but not the hidden input data.

jquery,

// HTML5 form data object.
var fd = new FormData();

var file_data = object.get(0).files[i];
var other_data = $('form').serialize(); // page_id=&category_id=15&method=upload&required%5Bcategory_id%5D=Category+ID

fd.append("file", file_data);

$.ajax({
    url: 'add.php',
    data: fd,
    contentType: false,
    processData: false,
    type: 'POST',
    success: function(data){
        alert(data);
    }
});

server.php

print_r($_FILES);
print_r($_POST);

result,

Array
(
    [file] => Array
        (
            [name] => xxx.doc
            [type] => application/msword
            [tmp_name] => C:\wamp\tmp\php7C24.tmp
            [error] => 0
            [size] => 11776
        )

)

I would like to get this as my result though,

Array
(
    [file] => Array
        (
            [name] => xxx.doc
            [type] => application/msword
            [tmp_name] => C:\wamp\tmp\php7C24.tmp
            [error] => 0
            [size] => 11776
        )

)

Array
(
    [page_id] => 1000
    [category_id] => 12
    [method] => upload
    ...
)

Is it possible?

Answer 1

var fd = new FormData();
var file_data = $('input[type="file"]')[0].files; // for multiple files
for(var i = 0;i<file_data.length;i++){
    fd.append("file_"+i, file_data[i]);
}
var other_data = $('form').serializeArray();
$.each(other_data,function(key,input){
    fd.append(input.name,input.value);
});
$.ajax({
    url: 'test.php',
    data: fd,
    contentType: false,
    processData: false,
    type: 'POST',
    success: function(data){
        console.log(data);
    }
});

Added a for loop and changed .serialize() to .serializeArray() for object reference in a .each() to append to the FormData.