AngularJS ng-repeat 处理空列表案例 [英] AngularJS ng-repeat handle empty list case

问题描述

我以为这是一件很常见的事情，但我找不到如何在 AngularJS 中处理它.假设我有一个事件列表并想用 AngularJS 输出它们，那么这很简单:

I thought this would be a very common thing, but I couldn't find how to handle it in AngularJS. Let's say I have a list of events and want to output them with AngularJS, then that's pretty easy:

<ul>
    <li ng-repeat="event in events">{{event.title}}</li>
</ul>

但是当列表为空时我该如何处理呢?我想在列表中放置一个消息框，其中包含无事件"或类似内容.唯一接近的是带有 events.length 的 ng-switch(当对象而不是数组时，我如何检查是否为空?)，但是真的是我唯一的选择吗?

But how do I handle the case when the list is empty? I want to have a message box in place where the list is with something like "No events" or similar. The only thing that would come close is the ng-switch with events.length (how do I check if empty when an object and not an array?), but is that really the only option I have?

推荐答案

您可以使用 ngShow.

<li ng-show="!events.length">No events</li>

参见示例.

或者你可以使用 ngHide

<li ng-hide="events.length">No events</li>

参见示例.

对于对象，您可以测试 Object.keys.

For object you can test Object.keys.

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