how to find the file inside input element html using jquery

i was trying to upload a file via $.ajax call using jQuery.. and formData

in order to append the file to the formData i did the following:

var fd = new formData();

that failed

then i tried :

var fd = new formData();

and again it failed then i tried:

var fd = new formData();

and that really worked and i could send my file to the server..

my question is:

why should I use the [0] next to the jquery object representing my file input element.. ?? notice that i didn't use the "multiple" attribute for the file input


$('selector') returns a jQuery object, and "files" attribute belongs to the DOM object, thus you will need to retrieve the DOM object via $('selector')[0] or $('selector').get(0).

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