Javascript angularjs：检查过滤器的长度，单位为ng重复

例如，我有一个重复列表：

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

---

可以将筛选结果指定给变量

<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>

{{item.text}

使用$parent您可以实现它

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

{{item.text}

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