angularjs: using service to communicate between controllers

问题

I have a service that is injected in my controllers. The service defines a number of functions.

Now I would like to add a variable to that service that would hold the selectedItem in the application. I've done it this way:

angular.module('myservices', []).
factory('serviceA', function () {        

    var serviceA= {  
      selectedItem: selectedItem,      
      ... more functions here
    };
    return serviceA;

    var selectedItem;
    ... functions go here
});

In one of my controllers I set the selected item:

 serviceA.selectedItem = someItem;

and in another controller the view references the selected item like this:

<span>{{serviceA.selectedItem.value}}</span>

The span is never updated, even though the selectedItem is set correctly. What am I doing wrong ?

回答1:

To access the service in your view, you need to assign it to the scope:

$scope.serviceA = serviceA;

http://jsfiddle.net/MzJsZ/

回答2:

angular.module('myservices', []).factory('serviceA', function () {        
  return {

//// factory returns an object

     var serviceA= {  
      selectedItem: selectedItem,      
      ... more functions here
    };
    return serviceA;

    var selectedItem;
    ... functions go here

}

});

does this work? you were missing the return{} part,where everything goes there. if you would use service you would write just this.serviceA={...}

and your code in controller is missing $scope !

$scope.someItem= serviceA.selectedItem;

or (i dont really know what you want) $scope.serviceA.selectedItem= someItem;

then in your span

<span>{{someItem.value}}</span>

or (i dont really know what you want) <span>{{serviceA.selectedItem.value}}</span>

PS i dont like that your controllers name is the same as object's - serviceA;

回答3:

Ah ! I got it to work !

Doing :

<span>{{serviceA.selectedItem.value}}</span>

in the view wouldn't work because although the serviceA is injected in the view's controller, I did not assign it to the scope... So correct way is to do that in the controller:

angular.module('controllers').controller('someCtrl',
['$scope', 'directDebitService', function ($scope, serviceA) {
    $scope.serviceA= serviceA;
}]);

Works fine now.

来源：https://stackoverflow.com/questions/18482488/angularjs-using-service-to-communicate-between-controllers

标签

angularjs

angularjs-service