openfoodnetwork/app/views/layouts/_shopfront_script.html.haml

:javascript
  $(document).ready(function() {
    var in_iframe = function(){
      try {
        return window.self !== window.top;
      } catch (e) {
        return true;
      }
    };

    var embedded_styles_active = $('body.off-canvas').hasClass('embedded');

    var set_shopfront_styles = function(state) {
      $.ajax({
        url: '/embedded_shopfront/'+state,
        type: 'POST'
      });
    };

    if (in_iframe() && !embedded_styles_active){
      $('body.off-canvas').addClass('embedded');
      set_shopfront_styles('enable');
    }

    if (!in_iframe() && embedded_styles_active) {
      $('body.off-canvas').removeClass('embedded');
      set_shopfront_styles('disable');
    }
  });