为什么我选择的ng-model无法反映我选择的ng-option? [英] Why does my select ng-model not reflect my selected ng-option?

问题描述

我正在尝试获取此代码以在我的 select ng-options 中提供一个值:

I'm trying to get this code to provide a value in my select ng-options:

<select ng-model="selectedMovieId" ng-if="movies.length>0" ng-options="movie.id as movie.title for movie in movies track by movie.id"></select>
  <div>
    {{selectedMovieId||'No movie selected'}}
  </div>

但是我从没看到 selectedMovieId 的值.我曾尝试在ng模型中添加一个点(类似于 foo.selectedMovieId )，但我一直收到错误消息.

But I never see a value for selectedMovieId. I've tried adding a dot to the ng model (something like foo.selectedMovieId) but I keep getting errors.

已经阅读了3-4个问题，我觉得这很简单，我很想念.

Having read 3-4 questions on this I feel like it has to be something simple I'm missing.

这是我的完整代码:

var app = angular.module("movieApp", []);

app.controller("movieCtrl", ["$scope", "$http", function($scope, $http) {
  $scope.apiKey = ''
  var baseUrl = 'https://api.themoviedb.org/3/'
  $scope.movies = []
  $scope.searchMovie = function() {
    var url = baseUrl + 'search/movie?api_key=' + $scope.apiKey + '&query=' + $scope.queryString;
    $http.get(url)
      .then(function(response) {
        $scope.movies = response.data.results;
      }, function() {
        console.log("some error");
      })
  }
  $scope.getCredits = function() {
    var url = baseUrl + 'movie/' + $scope.selectedMovieId + '/credits?api_key=' + $scope.apiKey
    console.log(url)
    console.log($scope.movies)
      /*$http.get(url)
          .then(function(response) {
              console.log(response.data)
              $scope.actors = response.data.results;
          }, function() {
              console.log("some error");
          })*/
  }
}]);

和html:

<div ng-app="movieApp" ng-controller="movieCtrl">
  <input type='text' ng-model='queryString' ng-submit="searchMovie()">
  <button ng-click="searchMovie()">
    Search
  </button>
  <hr/>
  <select ng-model="selectedMovieId" ng-if="movies.length>0" ng-options="movie.id as movie.title for movie in movies track by movie.id">
  </select>
  <div>
    {{selectedMovieId||'No movie selected'}}
  </div>
  <button ng-if="movies.length>0" ng-click="getCredits()">
    Get Credits
  </button>
</div>

还有我一直在工作的 jsfiddle .为什么 ng-model不会更新?

And the jsfiddle I've been working in. Why won't the ng-model update?

推荐答案

在没有提供某些数据的情况下，Demo无法工作，但是我怀疑您的问题打破了始终在 ng-model中使用对象的黄金法则

Demo doesn't work without some data provided however I suspect your problem is breaking the golden rule of always using an object in ng-model

ng-if 创建一个子作用域，并且该子作用域将像您当前正在使用的那样破坏原语上的2种方式绑定

ng-if creates a child scope and child scopes will break 2 way bindings on primitives like you are currently doing

在控制器中设置一个对象，以便继承可用于后续子作用域，然后在视图中将 ng-model 绑定到该对象

Set an object in controller so inheritance will work with subsequent child scopes and then in view bind ng-model to that object

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