javascript - angularjs:检查 ng-repeat 中过滤器的长度

Question

例如，我有这个重复列表:

<ul>
    <li class="suggestion-item" ng-repeat="item in suggestionList.items | filter: {id: 2} track by track(item)">{{item.text}}</li>
<ul>

我可以以某种方式(最好不改变 Controller ，因为它是一个指令)检查:如果过滤结果不为空 - 然后显示整个 ul，如果不是，则隐藏 ul.我的意思是:

<ul ng-if="(item in suggestionList.items | filter: {id: 2}).length > 0">
    <li class="suggestion-item" ng-repeat="item in suggestionList.items | filter: {id: 2} track by track(item)">{{item.text}}</li>
<ul>

Answer 1

您可以将过滤结果分配给变量

<ul ng-show="filterResult && filterResult.length">
    <li class="suggestion-item" ng-repeat="item in filterResult = (suggestionList.items | filter: {id: 2}) track by track(item)">{{item.text}}</li>
<ul>