Upload a file in couchdb with jQuery

gistfile1.js

$('#upload_file').submit(function(e){	
	e.preventDefault();
	var data = {};
	$("form :file").each(function() {
	    data[this.name] = this.value; // file inputs need special handling
	  });

	$(this).ajaxSubmit({
		url: database_url + '/' + $('#_id').val() ,
		dataType: 'json',
		success: function(responseText, statusText, xhr, $form) {
		}
	});
});