使用当前选定的选项创建 if 语句

Question

我的 Angular JS 页面上有以下下拉列表：

<div class="col-md-4 fieldMargin">
                        <div class="dropdownIcon">
                            <select name="actions" id="actions"
                                    ng-init="Data.formStatus.Action=Data.Actions[0]"
                                    ng-options="option.Value for option in Data.Actions"
                                    ng-focus="ActionsLabel = true" ng-blur="ActionsLabel = false;"
                                    ng-model="Data.formStatus.Action"
                                  
                           ></select>
                            <label for="actions" class="labelColor"
                                   ng-class="{'dropdownLabelFloat' : (ActionsLabel || Data.formStatus.Action != null), 'dropdownLabel' : !ActionsLabel && !Data.formStatus.Action  }">
                                Action
                            </label>
                        </div>
                    </div>

这些是上述下拉菜单的选项：

                    Test1
                    Test12
                    Test14
                    Test18
                    Test25
                    
                    and so on

根据用户在上面的操作下拉列表中所做的任何选择，我想更改同一页面上另一个控件的 ng-model：

这是另一个控件：

<div class="col-md-12 inputEmailSection">
                            <input type="text" name="to" id="to"
                                   ng-focus="ToLabel = true" ng-blur="ToLabel = false;"
                                   ng-model="Data.EmailInput.To" />
                            <label for="to" class="labelColor"
                                   ng-class="{'inputLabelFloat' : (ToLabel || Data.EmailInput.To!= null), 'inputLabel' : !ToLabel && !Data.EmailInput.To}">
                                To
                            </label>
                        </div>
                    

在“操作”下拉列表中，如果用户选择“Test1”，那么我希望 ng-model 为：

Data.EmailInput.To

但是如果用户从“操作”下拉列表中选择“Test18”或“Test25”，那么我希望 ng-model 为：

Data.EmailInput.ToSpecialCase



 <div class="col-md-12 inputEmailSection">
                            <input type="text" name="to" id="to"
                                   ng-focus="ToLabel = true" ng-blur="ToLabel = false;"
                                   ng-model="Data.EmailInput.ToSpecialCase" />
                            <label for="to" class="labelColor"
                                   ng-class="{'inputLabelFloat' : (ToLabel || Data.EmailInput.To!= null), 'inputLabel' : !ToLabel && !Data.EmailInput.To}">
                                To
                            </label>
                        </div>

是否可以在 angularJs HTML 页面上做一些事情。我尝试做这样的事情：

<div ng-if={{Data.formStatus.Action}} = "Test1" >
                           
                      <div class="col-md-12 inputEmailSection">
                            <input type="text" name="to" id="to"
                                   ng-focus="ToLabel = true" ng-blur="ToLabel = false;"
                                   ng-model="Data.EmailInput.To" />
                            <label for="to" class="labelColor"
                                   ng-class="{'inputLabelFloat' : (ToLabel || Data.EmailInput.To!= null), 'inputLabel' : !ToLabel && !Data.EmailInput.To}">
                                To
                            </label>
                        </div>
                </div>
                        
                     <div ng-else-if="Test18" or "Test25">
                                  <div class="col-md-12 inputEmailSection">
                            <input type="text" name="to" id="to"
                                   ng-focus="ToLabel = true" ng-blur="ToLabel = false;"
                                   ng-model="Data.EmailInput.ToSpecialCase" />
                            <label for="to" class="labelColor"
                                   ng-class="{'inputLabelFloat' : (ToLabel || Data.EmailInput.To!= null), 'inputLabel' : !ToLabel && !Data.EmailInput.To}">
                                To
                            </label>
                        </div>

                      </div>

因此，如果用户从下拉列表中选择“Test1”，那么我想显示：

  <div class="col-md-12 inputEmailSection">
                            <input type="text" name="to" id="to"
                                   ng-focus="ToLabel = true" ng-blur="ToLabel = false;"
                                   ng-model="Data.EmailInput.To" />
                            <label for="to" class="labelColor"
                                   ng-class="{'inputLabelFloat' : (ToLabel || Data.EmailInput.To!= null), 'inputLabel' : !ToLabel && !Data.EmailInput.To}">
                                To
                            </label>
                        </div>
                </div>

否则，如果用户选择“test18”或“test25”，那么我想显示：

<div>       
      <div class="col-md-12 inputEmailSection">
                        <input type="text" name="to" id="to"
                               ng-focus="ToLabel = true" ng-blur="ToLabel = false;"
                               ng-model="Data.EmailInput.ToSpecialCase" />
                        <label for="to" class="labelColor"
                               ng-class="{'inputLabelFloat' : (ToLabel || Data.EmailInput.To!= null), 'inputLabel' : !ToLabel && !Data.EmailInput.To}">
                            To
                        </label>
                    </div>

我对 AngularJs 很陌生。对此的任何帮助将不胜感激。

Answer 1

你已经快到了，AngularJS 中没有“其他”。所以只需制作 2 个

ng-if

即可。此外，您不需要在任何

{{}}

语句（如

ng-

）中使用把手

ng-if

。

<div ng-if="Data.formStatus.Action == 'Test1'">
    <!-- first block using the ng-model="Data.EmailInput.To" -->
</div>

<div ng-if="Data.formStatus.Action == 'Test18' || Data.formStatus.Action == 'Test25'">
    <!-- second block using the ng-model="Data.EmailInput.ToSpecialCase" -->
</div>

Answer 2

我不太明白

Data

在这种情况下是什么，我希望它是控制器 $scope 的

as

语法，无论如何请找到下面的工作示例供您参考，我们可以对测试 1 值进行相等检查，然后我们可以使用数组

includes

方法来检查它是否是多个值之一，测试 18 和测试 25

function Channels($scope) {
  $scope.ActionsLabel = false;
  $scope.Actions = [{
      Value: 'Test1'
    },
    {
      Value: 'Test18'
    },
    {
      Value: 'Test25'
    },
  ];
  $scope.formStatus = {
    Action: '',
  };
  $scope.EmailInput = {
    To: '',
    ToSpecialCase: '',
  };
}

angular.module('app', [])
  .controller('Channels', Channels);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app ng-controller="Channels">
  <div class="col-md-4 fieldMargin">
    <div class="dropdownIcon">
      <select name="actions" id="actions" ng-init="formStatus.Action=Actions[0]" ng-options="option.Value for option in Actions" ng-focus="ActionsLabel = true" ng-model="formStatus.Action"></select>
      <label for="actions" class="labelColor">
        Action
      </label>
    </div>
  </div>

  <div ng-if="formStatus.Action.Value == 'Test1'">
    <div class="col-md-12 inputEmailSection">
      <input type="text" name="to" id="to" ng-focus="ToLabel = true" ng-blur="ToLabel = false;" ng-model="EmailInput.To" placeholder="to" />
      <label for="to" class="labelColor">
        To
      </label>
    </div>
  </div>

  <div ng-if="['Test18', 'Test25'].includes(formStatus.Action.Value)">
    <div class="col-md-12 inputEmailSection">
      <input type="text" name="to" id="to" ng-focus="ToLabel = true" ng-blur="ToLabel = false;" ng-model="EmailInput.ToSpecialCase" placeholder="ToSpecialCase" />
      <label for="to" class="labelColor">
        To
      </label>
    </div>

  </div>

</div>