Add checkbox as control in leaflet map

controllers.js

        // create the control
        var autoZoomCheckbox = L.control({position: 'topleft'});
        autoZoomCheckbox.onAdd = function (map) {
            var div = L.DomUtil.create('div', 'command');
            div.innerHTML = '<form><input id="command" type="checkbox"/>Automatic fit to bounds</form>';
            return div;
        };
        autoZoomCheckbox.addTo(map);