Checking for offline status in a Cordova app using Angular

I have implemented the following code to determine whether my Cordova application is online or offline.

var networkState = navigator.connection.type;

var states = {};
states[Connection.UNKNOWN]  = 'Unknown';
states[Connection.ETHERNET] = 'Ethernet';
states[Connection.WIFI]     = 'WiFi';
states[Connection.CELL_2G]  = 'Cell2G';
states[Connection.CELL_3G]  = 'Cell3G';
states[Connection.CELL_4G]  = 'Cell4G';
states[Connection.CELL]     = 'Cellgeneric';
states[Connection.NONE]     = 'Nonetwork';
alert(states[networkState]);
if(states[networkState]!='Nonetwork'){
online=true;
}else{
online=false;
}

Below is an example of how my Angular controller is structured:

 .controller('MainCtrl',['$scope','$http','$localStorage','$state',function($scope, $http, $localStorage, $state){ 

  if(online==true){

    //code for online
  }else{
    // code for offline
   } 

}])

I have called this check within the 'deviceready' event, but I am encountering an issue where deviceready is triggered after the controller has started execution. Is there a way to verify the network status before the Angular controller begins running?

javascriptangularjscordova

Answer №1

When working with Angular, controllers are executed during the running phase of your application. However, you also have the option to execute code before this phase, known as the configuration phase.

I recommend taking a look at the module documentation from Angular for more information.

  • During configuration blocks, code is executed when providers are registered and configured. Only providers and constants can be injected into these blocks to prevent premature instantiation of services.

  • On the other hand, run blocks are executed after the injector is created to kickstart the application. Only instances and constants can be injected here to avoid further system configuration during runtime.

To implement this in your code, consider following this structure:

angular.module('myModule', []).
config(function(injectables) { // provider-injector
  // Sample config block where only Providers can be injected.
}).
run(function(injectables) { // instance-injector
  // Sample run block where only instances can be injected.
});

This approach should enable you to execute code before running your controller effectively.

Keep in mind that the configuration will only occur once, so if there are changes in connection (e.g., switching from 4G to 3G), you may need to check regularly or within your controller function. Consider implementing a function that activates upon the controller's activation for optimal performance.

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