This would seem stupid but i can't seem to understand the documentation.
I'm talking about This plugin for file upload.

Now according to the documentation there's an option :

formData

Additional form data to be sent along with the file uploads can be set using this
option, which accepts an array of objects with name and value properties, a function
returning such an array, a FormData object (for XHR file uploads), or a simple object.
The form of the first fileInput is given as parameter to the function.

Note: Additional form data is ignored when the multipart option is set to false.

Type: Array, Object, function or FormData Default: A function
returning the form fields as serialized Array:

function (form) {

    return form.serializeArray();

}

Example:

[
{
name: 'a',
value: 1
},
{
name: 'b',
value: 2
} ]

Which i fail to understand what i'm suppoused to do with that.

This is how i initialize the plugin :

$('#add_image_upload').fileupload({

            dataType: 'json',

    sequentialUploads: true,

    formData : getDate

});

And this is my attempt to the function :

 function getDate(){



//if user didn't selected a date

if(!selectedDate || selectedDate==undefined){

selectedDate = 1/1/+$('#timeline').html();

}

var date= new Array(selectedDate);

return date;

}