How can I count the number of files that are in the file upload input using jQuery?

I have tried this but it always returns 1:

$(body).on(change, .create-album .custom-file-input .createAlbumFileUpload, function(){   



    var numFiles = $(input:file, this).length;

    alert(numFiles);

});

My HTML:

<form enctype=multipart/form-data class=createAlbumFileUpload>

    <input type=file name=uploadFile[] multiple=multiple/>

</form>

I found this jsFiddle on another question asking the same thing, however I can't see why mine isn't working?