AngularJS Dropdown的问题 [英] Issue with AngularJS Dropdown

问题描述

我创建了AngularJS可靠的下拉菜单，它可以很好地处理脚本文件中的静态数据.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网址，有一个网址可以提供所有内容.

I have created AngularJS dependable dropdowns, its working fine with static data from script file. Now how can I bind data to these dropdowns from an URL. I don't have a separate url for dropdowns, there is one url delivering everything.

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

How should I parse the data to get the required output? Iam very new to this, Will be grateful if anyone can help!!

推荐答案

第一个在这里工作的朋克:

First working Punker here:

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

问题在于您的问题陈述了某些内容，而您的演示则显示了其他内容.

The problem is your question states something and your demo shows something else.

您可以直接使用angular即时解析JSON数据，然后没有ng-change函数来检测选择了哪个下拉列表.有关我如何解析html本身中的数据的信息，请参考下面的代码.

You can directly parse the JSON data on fly using angular then you don't have ng-change function to detect which dropdown was selected. Refer to the below code on how I'm parsing the data in html itself.

                <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>

接下来的第二个下拉列表是 STATE ，即使范围发生了变化，它也不会触发更改.

next your second dropdown which is STATE doesn't trigger on change even if the scope is changed.

因此，当$watch发生作用域变化时，将其应用于 CITY

So use a $watch to see the changes to scope when it happens apply it to the CITY

所以您的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:上面的插件并不是很完美，您可能会解决一些小问题.

PS: The above plunker isn't very perfect you may some some minor issues which you should be able to solve.

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