javascript - 如果在 ng-repeat 中与 ng-switch 一起工作，如何使用？

Question

http://plnkr.co/edit/GQ40yelDbLMpRyZqYpNB?p=preview

或任何其他 ng

在上面的示例中，我有一个包含一些比特币交易的模型，一些是传入的，一些是传出的，两者都有不同的图标。

vm.transactions = [
  {
    type: 'incoming',
    comment: 'Recieved from multiple addresses',
    time: '10 hours ago',
    amount: 0.00498623
  },
  {
    type: 'incoming',
    comment: 'Recieve from 1MgZLyz6d8djEqe68XoPpsjx9BFQyVAtXN',
    time: '12 hours ago',
    amount: 0.003
  },
  {
    type: 'outgoing',
    comment: 'Sent to 17dPAMzZiosQYVty6ES4KSWN8R8XFcxShH',
    time: 'Jan 15th 2015',
    amount: 0.01
  },
  {
    type: 'incoming',
    comment: 'Recieved from multiple addresses',
    time: 'Jan 14th 2015',
    amount: 0.02874
  },
  {
    type: 'outgoing',
    comment: 'Sent to 1GS9E86Y3mhK7Qwm1vqvgCmpE5u6MMxPML',
    time: 'Jan 12th 2015',
    amount: 0.064904
  }
];

我找到了这些关于ng-switch 的文档

用法

<ANY ng-switch="expression">
  <ANY ng-switch-when="matchValue1">...</ANY>
  <ANY ng-switch-when="matchValue2">...</ANY>
  <ANY ng-switch-default>...</ANY>
</ANY>

所以这就是我目前正在尝试的，但图标没有出现：

<tr class="row_body"
    ng-repeat="trans in transactions">

    <td class="td_icon" ng-switch="{{trans.type}}">
        <div ng-switch-when="incoming" class="icon-download">↓&lt;/div>
        <div ng-switch-when="outgoing" class="icon-upload">↑&lt;/div>
    </td>
    <td class="td_comment">
        {{ trans.comment }}
        <p class="date">{{ trans.time }}</p>
    </td>
    <td class="td_amount green">{{ trans.amount }}</td>
</tr>

你知道我哪里错了吗？还是ng我需要使用另一个？

Answer 1

改变

<td class="td_icon" ng-switch="{{trans.type}}">

到

<td class="td_icon" ng-switch="trans.type">

该术语expression有时会在 Angular 文档中令人困惑

工作小插曲

Answer 2

您想删除此行上的大括号（角度将为ng-switch您评估 an 的值）：

<!-- before -->
<td class="td_icon" ng-switch="{{trans.type}}">

<!-- after -->
<td class="td_icon" ng-switch="trans.type">