AngularJS下拉问题

Question

我已经创建了 AngularJS 可靠的下拉菜单，它可以很好地处理来自脚本文件的静态数据。现在如何将数据从 URL 绑定到这些下拉列表。我没有用于下拉菜单的单独 url，只有一个 url 提供所有内容。

我应该如何解析数据以获得所需的输出？我对此很陌生，如果有人能提供帮助，将不胜感激！

Answer 1

这里是第一个工作的朋克：

http://plnkr.co/edit/okKOeQViflRseqrOYeOY?p=preview

问题是您的问题说明了一些内容，而您的演示显示了其他内容。

您可以使用 angular 直接解析 JSON 数据，然后您没有 ng-change 函数来检测选择了哪个下拉菜单。请参阅以下代码，了解我如何解析 html 本身中的数据。

                <div class="col-sm-4">
                    <am-multiselect class="input-lg"
                                    template-url="multiselect.tmpl.html"
                                    ng-model="selectedcountry" ms-header="Select country" style="width:200px;"
                                    options="c.CountryName for c in table"
                                    ng-change="setState(selectedcountry)"
                                    change="selected()"></am-multiselect>



                </div>
            </div>
            <div class="form-group">

                <div class="col-sm-4">
                    <am-multiselect class="input-lg" multiple="true" ms-selected="{{selectedState.length}} State(s) selected"
                                    ng-model="selectedState" ms-header="Select States"
                                    options="s.STATE for s in table"
                                    ng-change="setCity(selectedState)"
                                    template-url="multiselect.tmpl.html" style="width:500px;"
                                    change="selected()">
                    </am-multiselect>

                </div>
            </div>

            <div class="form-group">

                <div class="col-sm-4">
                    <am-multiselect class="input-lg" multiple="true" ms-selected="{{selectedCity.length}} City(ies) selected"
                                    ng-model="selectedCity" ms-header="Select City"
                                    options="m.CityName for m in table"
                                    template-url="multiselect.tmpl.html" style="width:500px;"
                                    change="selected()"></am-multiselect>

                </div>
            </div>

下一个下拉菜单 STATE 不会在更改时触发，即使范围发生更改。

所以使用$watch 来查看范围的更改，当它发生时将其应用到CITY

所以你的js：

angular.module('app', ['am.multiselect']);

angular.module('app')
  .controller('ctrl', function($scope, $http, $location, $filter,$window) {

    var tableData = {
      "Table": [{
        "CountryUid": 3,
        "CountryName": "INDIA",
        "STATE": "AndraPradesh",
        "CityId": 3,
        "CityName": "Vijayawada"
      }, {
        "CountryUid": 2,
        "CountryName": "USA",
        "STATE": "Florida",
        "CityId": 3,
        "CityName": "Tampa"
      }, {
        "CountryUid": 3,
        "CountryName": "INDIA",
        "STATE": "Assam",
        "CityId": 3,
        "CityName": "Jorhat"
      }]
    };

    var countries = [];
    var states = [];
    var cities = [];

    $scope.table = tableData.Table;
    $scope.countries = countries;
    $scope.states = states;
    $scope.cities = cities;
    $scope.selectedsite = null;
    $scope.selectedState = [];
    $scope.selectedCity = [];

    $scope.setState = function(country) {
      $scope.selectedStates = tableData.Table.filter(function(el) {
        return el.CountryName === country
      });
      $scope.selectedState = $scope.selectedStates.map(function(elm) {return elm.STATE;});
    }
    $scope.setCity = function(state) {
      selectedCity = tableData.Table.filter(function(el) {
        return el.STATE === state
      });
      $scope.selectedCity = selectedCity.map(function(elm) {return elm.CityName;});
    }
    $scope.$watch('selectedStates', function(newVal, oldVal, theScope) {
      $scope.selectedCity = newVal.map(function(elm) {return elm.CityName;});
      console.log(newVal,$scope.selectedCity);
    });

PS：上面的plunker不是很完美，你可能会遇到一些小问题，你应该能够解决。