Question

我正在使用AngularJS ng-repeat来创建城市列表。该列表由用户在客户端动态构建。用户从页面左侧的列表中选择城市，单击“添加城市”按钮，城市将添加到右侧的列表中。 ng-repeat位于两个列表中，但是当城市添加到右侧列表中时，列表项的$ index值不会更新。 $ index值全为零。

以下是动态添加城市的ng-repeat列表：

<div ng-repeat="(key, value) in filter.selectedCities | groupBy:'country'" class="text-left">
    <div ng-repeat="(key2, value2) in value | groupBy:'state'" class="text-left">
        <span class="label label-default">{{key}}   </span>&nbsp;<span class="label label-danger" ng-show="key2.length">{{key2}}    </span>
        <ul class="nav nav-pills">
            <li class="selectedpill" ng-repeat="city in value2">
                <div class="pull-left">
                    <span class="indent8">{{ city.label | characters:24 :true}}</span>
                </div>
                <div class="pull-right">
                    <i class="fa fa-heart pointer" ng-click="addToCityFavs($index);" ng-class="{'maroonzheimer' : checkFavCity(city)}" ng-hide="savingCityFav" title="Add To Favorites"></i>
                    <i class="fa fa-spinner fa-spin" ng-show="savingCityFav"></i>
                    <i class="fa fa-times fa-lg pointer" ng-click="removeCity(city)" title="Remove City"></i>
                </div>
            </li>
        </ul>
    </div>
</div>

以下是用于将城市动态添加到列表中的JavaScript函数：

  $scope.addSelectedCity = function () {
    if ($scope.selectedCity && $scope.selectedCity.value) {
      $scope.addCity($scope.selectedCity);
      $scope.cityValidationError = false;

    } else { $scope.cityValidationError = true; }
    $scope.tempSelectedCity = null;
    $scope.selectedCity = null;
  }

  $scope.addCity = function (city) {
    if (city && city.city && !$scope.checkCityExists(city)) {
      $scope.filter.selectedCities.push(city);
    }    
  }

$scope.addToCityFavs = function (index) {
  var city = $scope.filter.selectedCities[index];
  var exists = false;

  for (var i = 0; i < $scope.filter.favs.CityList.length; i++) {
    if ($scope.filter.favs.CityList[i].city.value == city.value) {
      exists = true;
    }
  }

 if (!exists) {
   $scope.savingCityFav = true;
   var fav = { id: 0, active: true, ruser_id: 0, city: city };

我是否需要在HTML或JavaScript函数中添加内容以获取ng-repeat列表，以便在将城市添加到列表后更新$ index值？

我会感激任何人都能给予的帮助。

Answer 1

尝试将track by $index添加到ng-repeat。请参阅此链接以获取示例：https://egghead.io/lessons/angularjs-index-event-log

Answer 2

所以看起来索引只需要从数组filter.selectedCities获取城市。但是你不需要索引，因为你可以直接使用城市：

ng-click="addToCityFavs(city);"

$scope.addToCityFavs = function (city) {
  //no longer needed -> var city = $scope.filter.selectedCities[index];
  var exists = false;

动态构建AngularJS ng-repeat列表，$ index始终为零

2 个答案: