AngularJS Update Service Variable Not Working

问题

I have a list of images. One next to the other. I'm trying to capture which image was clicked, populate a modal div and show it.

Markup

    <section class="portfolio-grid column small-12" ng-controller="PortfolioCtrl">
    <ul class="small-block-grid-2 medium-block-grid-4">
        <li ng-repeat="portfolio in portfolios">
            <a ng-click="showModal($index)" title="">
                <img ng-src="{{portfolio.thumb}}" alt="">
                <div class="details">
                    <h4>{{portfolio.name}}</h4>
                </div>
            </a>
        </li>
    </ul>
</section>
======== Some Other HTML ========
<div class="popup" ng-controller="ModalCtrl">{{info}}</div>

At first it shows {"name":"Test"}, which is alright. After I click it does not get updated even though I believe I am changing the variable inside the service when I click.

Controller

app.controller("PortfolioCtrl", function($scope, $rootScope, PortfolioService, ModalService){
    $scope.portfolios = PortfolioService.list();
    $scope.showModal = function(index){
        ModalService.setInfo($scope.portfolios[index]);
    }

});
app.controller("ModalCtrl", function($scope, ModalService){
    $scope.info = ModalService.getInfo();
});

Service

app.service('ModalService', function(){
    var modalInfo = {"name":"test"};

    this.setInfo = function(data){
        modalInfo = data;
    };
    this.getInfo = function(){
        return modalInfo;
    };

});

app.service('PortfolioService', function(){
    var portfolios = [
        {"name":"Project Name 1", "thumb":"http://placehold.it/480&text=1", "bigImg":"http://placehold.it/1000x500&text=1", "description":"Description text 1", "linkToLive": "#"},
        {"name":"Project Name 2", "thumb":"http://placehold.it/480&text=2", "bigImg":"http://placehold.it/1000x500&text=2", "description":"Description text 2", "linkToLive": "#"},
    ]

    this.list = function(){
        return portfolios;
    }

});

回答1:

Your ModalCtrl controller function is only called once, when the modal is encountered into the DOM. This means that $scope.info is set to the initial value returned by ModalService.getInfo() and never changed.

You could watch for changes of the value returned by getInfo:

app.controller("ModalCtrl", function($scope, ModalService){
    $scope.$watch(function() { return ModalService.getInfo(); }, function(){
        $scope.info = ModalService.getInfo();
    });    
});

回答2:

You didn't insert dependecy injection ModalService in PortfolioCtrl controller

app.controller("PortfolioCtrl", function($scope, $rootScope, PortfolioService,ModalService ){
    $scope.portfolios = PortfolioService.list();
    $scope.showModal = function(index){
        ModalService.setInfo($scope.portfolios[index]);
    }

});

来源：https://stackoverflow.com/questions/30272156/angularjs-update-service-variable-not-working

标签

javascript

jquery

angularjs

angular-services