How to configure phonegap error output?

Question

phonegap

There is an application created by phonegap. In the absence of the Internet, it displays
How to make it display a connection error.

var $$ = Dom7;

        var app_id = '9';
        var api_link = '/';
        // Theme
        var theme = 'auto';
        if (document.location.search.indexOf('theme=') >= 0) {
          theme = document.location.search.split('theme=')[1].split('&')[0];
        }
        var app = new Framework7({
          id: 'com.alstrapp.testapp',
          root: '#app',
          theme: theme,
          data: function () {
            return {
              project: {
                id: app_id,
                api_link: api_link,
              },
            };
          },
          methods: {
            helloWorld: function () {
              app.dialog.alert('Hello World!');
            },
          },
          routes: routes,
          vi: {
            placementId: '',
          },
        });
        // Init/Create main view

        // Add statistic
        var userToken = localStorage.getItem('usertoken');

        // Check device
        if (app.device.ios) {
          var device = 1;
        } else if (app.device.android) {
          var device = 2;
        } else {
          var device = 3;
        }

        app.request({
          beforeSend: function (xhr) {
            if (userToken) {
              xhr.setRequestHeader('authorization', userToken);
            }
          },
          url: api_link + 'api/app/add_statistic?app_id=' + app_id +'&device='+ device,
          crossDomain: true,
          method: 'GET',
          success: function(response) {

            var alertsNotify = JSON.parse(response);

            //console.log(alertsNotify.count);

            if (alertsNotify.event == 'success') {

              

            }

          },
          error: function (error) {

            var dialogs = app.dialog.create({
                title: 'Ошибка',
                text: 'Проверьте подключение к интернету',
            }).open();

          },
        });
        var opened = 0;
        function exitApp(){
          if (opened > 0) {
            return false;
          } else {
            app.dialog.confirm('Are you sure you want to exit?', 'Exit App', 
              function () {
              navigator.app.exitApp();
              },
              function () {
              opened = 0;  
              return false;
              }
            );
            opened = 1;
          }
        }

            
        function onBackKeyDown() {
          // Handle the back button
          if(app.views.main.history.length == 1){
            exitApp();
            e.preventDefault();
          } else {
            app.dialog.close();
            app.views.main.router.back();
            return false;
          }
        }

        document.addEventListener('backbutton', onBackKeyDown, false);
        window.open('мойсайт.ру', '_self ', 'location=no,zoom=no');