function toggle_outlet(svg) {
	let sub_dev = get_object_from_svg(svg).parentElement;
	let params = {
		device_id: sub_dev.parentElement.parentElement.id,
		sub_dev_id: sub_dev.id
	};
	let query = Object.keys(params)
		.map(k => encodeURIComponent(k) + '=' + encodeURIComponent(params[k]))
		.join('&');
	fetch(window.location.href + 'toggle?' + query)
	.then(function(response) {
		if (!response.ok) {
			throw new Error('HTTP error, status = ' + response.status);
		}
		return response.json();
	})
	.then(function(json) {
		console.log(json);
	});
}

function get_object_from_svg(svg) {
	var all_objects = document.getElementsByTagName("object");
	for (var i=0; i < all_objects.length; i++) {
		if (svg === all_objects[i].getSVGDocument().firstElementChild) {
			return all_objects[i];
		}
	}
	return null;
}