Question

我一直在寻找这个问题的答案;我不介意，但实际上它工作得更早。如果在localStorage中没有存储用户访问令牌，我正试图在加载应用程序时在Ionic App中打开一个模态。

这是我正在使用的代码：

JS

.controller('LeagueCtrl', function($scope, $ionicModal, $ionicPlatform, $cordovaOauth, Spotify, Favourites) {
  $scope.favourites = Favourites.all();

  $ionicModal.fromTemplateUrl('templates/login.html', {
    scope: $scope,
    animation: 'slide-in-up'
  }).then(function (modal) {
    $scope.modal = modal;
    console.log($scope.modal);
  });

  $scope.openModal = function() {
    $scope.modal.show();
  };

  $scope.closeModal = function() {
    $scope.modal.hide();
  };

...

  $scope.loginSpotify = function () {
    $cordovaOauth.spotify('583ac6ce144e4fcb9ae9c29bf9cad5ef', ['user-read-private']).then(function(result) {
        window.localStorage.setItem('spotify-token', result.access_token);
        Spotify.setAuthToken(result.access_token);
        $scope.updateInfo();
        //$scope.closeModal();
    }, function(error) {
      console.log("Error -> " + error);
    });
  };

  $scope.updateInfo = function() {
    Spotify.getCurrentUser().then(function(data) {
      $scope.getUserPlaylists(data.id);
    }, function(error) {
      $scope.loginSpotify();
    });
  };

  $ionicPlatform.ready(function() {
    var storedToken = window.localStorage.getItem('spotify-token');
    if (storedToken !== null) {
      Spotify.setAuthToken(storedToken);
      $scope.updateInfo();
    } else {
      $scope.openModal();
      alert('ionicPlatform ready');
    }
  });

})

HTML

<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">
    <title></title>


    <link href="css/ionic.app.css" rel="stylesheet">

    <script src="lib/ionic/js/ionic.bundle.js"></script>

    <script src="lib/ngCordova/dist/ng-cordova.js"></script>
    <script src="lib/ng-cordova-oauth/dist/ng-cordova-oauth.min.js"></script>
    <script src="lib/angular-spotify/dist/angular-spotify.min.js"></script>
    <script src="cordova.js"></script>


    <script src="js/controllers.js"></script>
    <script src="js/services.js"></script>
    <script src="js/app.js"></script>
  </head>
  <body ng-app="share">

    <ion-nav-bar class="bar-assertive">
      <ion-nav-back-button>
      </ion-nav-back-button>
    </ion-nav-bar>

    <ion-nav-view></ion-nav-view>
  </body>
</html>

正如我之前说的那样，它实际上正在工作，按预期在启动时打开模态。然后它就停止了工作，产生了我之前遇到的错误，没有明显的原因。错误如下：

ypeError: Cannot read property 'show' of undefined
at Scope.$scope.openModal (http://localhost:8100/js/controllers.js:24:17)
at http://localhost:8100/js/controllers.js:60:14
at http://localhost:8100/lib/ionic/js/ionic.bundle.js:53329:19
at Object.ionic.Platform.ready (http://localhost:8100/lib/ionic/js/ionic.bundle.js:2135:9)
at Object.self.ready (http://localhost:8100/lib/ionic/js/ionic.bundle.js:53327:26)
at new <anonymous> (http://localhost:8100/js/controllers.js:54:18)
at invoke (http://localhost:8100/lib/ionic/js/ionic.bundle.js:17762:17)
at Object.instantiate (http://localhost:8100/lib/ionic/js/ionic.bundle.js:17770:27)
at http://localhost:8100/lib/ionic/js/ionic.bundle.js:22326:28
at self.appendViewElement (http://localhost:8100/lib/ionic/js/ionic.bundle.js:56883:24) <ion-nav-view name="tab-league" class="view-container tab-content" nav-view="active" nav-view-transition="ios">

任何帮助都会被大量赞赏，我无法理解问题所在。

Answer 1

尝试在$ionicPlatform.ready()的回调函数中创建模态。

检查此代码：

$scope.createModal = function(){
    if($scope.modal){
        $scope.openModal();
    }
    else{
        $ionicModal.fromTemplateUrl('templates/login.html', {
            scope: $scope,
            animation: 'slide-in-up'
        }).then(function (modal) {
            $scope.modal = modal;
            $scope.modal.show();
        });

        $scope.openModal = function() {
            $scope.modal.show();
        };

        $scope.closeModal = function() {
            $scope.modal.hide();
        };
    }
}

在$scope.openModal()

中调用上述功能代替$ionicPlatform.ready()

$ionicPlatform.ready(function(){
    ...
    ...
    $scope.createModal();
    ...
    ...
})

Answer 2

请尝试打包代码，以便更新$scope $scope.$apply()中的$scope.$apply(function () { <your codes that update $scope.<your variables>> });个变量：

$ionicPlatform.ready()

这是因为$scope中的代码将在另一个JavaScript转弯中运行。 AngularJS不知道$scope.$apply()变量已更新，因此不会更新任何HTML元素。

在$scope.$digest中包含您的代码会致电$scope以将您的@Html.DropDownListFor(m => m.State, new SelectList(ViewBag.StateList, "StateId", "StateName"), "Select state", new { @class = "form-control", @onchange="FillCity()" }) function FillCity() { var stateId = $('#State').val(); $.ajax({ url: '/Employees/FillCity', type: "GET", dataType: "JSON", data: { State: stateId}, success: function (cities) { $("#City").html(""); // clear before appending new list $.each(cities, function (i, city) { $("#City").append( $('<option></option>').val(city.CityId).html(city.CityName)); }); } }); }变量更改应用于HTML。

在$ ionicPlatform.ready

2 个答案: