Angularjs select 值未定义

Question

现在我试图从 select 下拉列表中获取值，但它 return 未定义。东西在 html 级别，它按预期工作，这是我的代码：

<div class='subcontent'>            
  <input id="me" type="radio" class='choosemethod' ng-model="paymentmethod" value="Y"><label for="me" class='choosemethod'>Me</label>
  <input id="company" type="radio"  ng-model="paymentmethod" value="N" class='choosemethod'><label for="company" class='choosemethod'>My Company</label><br/>
  <span class='helptext'>Who makes payments to this account?</span><span class='help' style='margin-left:20px;width:20px;height:20px;'>help</span>
</div>

<div class='paymentmethods subcontent' ng-switch on="paymentmethod">
  <select ng-model='selectedmethod' ng-init="selectedmethod=Memethods[0]" id='methods' ng-switch-when='Y'>
    <option ng-repeat="method in Memethods" value="{{method}}">{{method}}</option>
  </select>

  <select ng-model='selectedmethod' ng-init="selectedmethod=companies[0]" ng-switch-when='N' style='float:left'>
    <option ng-repeat='companyoption in companies' value="{{companyoption}}">{{companyoption}}</option>
  </select>

  <div class='clear'></div>
  <label for ='methods'>Payment Method</label><span class='help' style='margin-left:20px;width:20px;height:20px;'>help</span>
</div>

在 js 中：

$scope.Memethods = ['Same as Card/Account Name','American Express','American Express Corp','Cash','Checking','MasterCard','My Visa','VISA'];
$scope.companies = ['Company Paid','MyAMEX'];

它在页面中显示正常，但是当我尝试获取值时，它显示未定义。有什么想法吗？

Answer 1

可以参考这个简单的example

html代码：

<div ng-controller="Main" ng-app>
    <div>selections = {{selections}}</div>

    <div>
      <p>Model doesn't get updated when selecting:</p>
      <select ng-repeat="selection in selections" ng-model="selection" ng-options="i.id as i.name for i in items">
        <option value=""></option>
      </select>
    </div>

js代码：

function Main($scope) {

    $scope.selections = ["", "id-2", ""];

    $scope.reset = function() {
        $scope.selections = ["", "", ""];
    };

    $scope.sample = function() {
        $scope.selections = [ "id-1", "id-2", "id-3" ];
    }

    $scope.items = [{
        id: 'id-1',
        name: 'Name 1'},
    {
        id: 'id-2',
        name: 'Name 2'},
    {
        id: 'id-3',
        name: 'Name 3'}];
}

Answer 2

这是经典的 "angular dot notation" 问题。

Here is a working example

基本上，ng-switch 创建一个新范围，所以当 select 设置 selectedmethod 属性时，它是在新范围而不是控制器范围上这样做的如您所料。一种解决方案是为您的模型创建父对象。

angular.module('app',[])
.controller('main', function($scope){
  $scope.selection = {};
  $scope.Memethods = ['Same as Card/Account Name','American Express','American Express Corp','Cash','Checking','MasterCard','My Visa','VISA'];
  $scope.companies = ['Company Paid','MyAMEX'];
})

并注意它在 html:

中的不同引用方式

<select ng-model='selection.selectedmethod' ng-init="selection.selectedmethod=companies[0]" ng-switch-when='N' style='float:left'>
  <option ng-repeat='companyoption in companies' value="{{companyoption}}">{{companyoption}}</option>
</select>

另一种（也许更好）的方法是使用 "ControllerAs" 语法，它的效果是为您执行此操作。

angular.module('app',[])
    .controller('main', function($scope){

      this.Memethods = ['Same as Card/Account Name','American Express','American Express Corp','Cash','Checking','MasterCard','My Visa','VISA'];
      this.companies = ['Company Paid','MyAMEX'];
    })

<body ng-app="app" ng-controller="main as main">
  <div class='subcontent'>
    <input id="me" type="radio" class='choosemethod' ng-model="paymentmethod" value="Y">
    <label for="me" class='choosemethod'>Me</label>
    <input id="company" type="radio" ng-model="paymentmethod" value="N" class='choosemethod'>
    <label for="company" class='choosemethod'>My Company</label>
    <br/>
    <span class='helptext'>Who makes payments to this account?</span><span class='help' style='margin-left:20px;width:20px;height:20px;'>help</span>
  </div>

  <div class='paymentmethods subcontent' ng-switch on="paymentmethod">
    <select ng-model='main.selectedmethod' ng-init="main.selectedmethod=main.Memethods[0]" id='methods' ng-switch-when='Y'>
      <option ng-repeat="method in main.Memethods" value="{{method}}">{{method}}</option>
    </select>

    <select ng-model='main.selectedmethod' ng-init="main.selectedmethod=main.companies[0]" ng-switch-when='N' style='float:left'>
      <option ng-repeat='companyoption in main.companies' value="{{companyoption}}">{{companyoption}}</option>
    </select>

    <div class='clear'></div>
    <label for='methods'>Payment Method</label><span class='help' style='margin-left:20px;width:20px;height:20px;'>help</span>

  </div>
  <div>{{main.selectedmethod}}</div>
</body>

Answer 3

ng-model里面的值在表示前必须有Initialize。所以 ng-init 出现在 ng-model 之前。在选项 $first 中用于 select 第一个值。

<select ng-init= "selectedmethod=companies[0]" ng-model='selectedmethod' ng-switch-when='N' style='float:left'>
    <option ng-repeat='companyoption in companies' value="{{companyoption}}" ng-selected="$first">{{companyoption}} 
    </option>
</select>

Angularjs select 值未定义

Angularjs select value is undefined

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