过滤基于一个子对象属性的NG-重复列表 [英] Filtering an ng-repeat list based on a sub-object property
问题描述
通过子对象我的意思是，我与显示对象NG-重复所有包含对象的列表内自己，我期待基于这些子对象之一的属性过滤。
By sub-object I mean that the objects I am displaying with ng-repeat all contain a list of objects within themselves, and I am looking to filter based on the property of one of those sub-objects.
仅这是很简单的事。我有日报的对象，每个都包含一个日期和项对象列表：
This alone was quite straightforward to do. I have an object of dailies, each containing a date and an entries list of objects:
function Ctrl($scope) {
$scope.dailies = [{date: new Date('07/07/2013'),
entries: [{category: 'A', note:'Lorem ipsum'},
{category: 'B', note: 'Lorem ipsum'}]},
{date: new Date('05/02/2013'),
entries: [{category: 'A', note: 'Lorem ipsum'}]}];
}
我显示出来，按类别过滤：
I display them, filtering by category:
<div ng-controller="Ctrl">
<div class="daily" ng-repeat="daily in dailies | orderBy:'-date' ">
{{ daily.date | date:'dd/MM/y' }}
<div class="entry" ng-repeat="entry in daily.entries | filter:{ category: 'B'} ">
<span>{{ entry.category }}</span>, <span>{{ entry.note }}</span>
</div>
</div>
</div>
在这里，我的问题是，现在根本不包含任何条目日常对象仍然显示。怎样实现的情况下，如果滤波使的每日清空项列表，即每日则不予显示？
My issue here is that the daily objects that now contain no entries at all are still displayed. How do I achieve a situation where, if the filtering makes the entries list of a daily empty, that daily is not displayed either?
推荐答案
您被允许创建前pressions内新成员的范围。
You are allowed to create new scope members inside the expressions.
这可以让你指定一个筛选的列表到一个新的变量，它可以在整个本地范围内使用。就这样，你可以通过过滤列表的长度NG-显示：
This lets you assign a filtered list to a new variable, which can be used throughout the local scope. With that, you can pass the length of the filtered list to ng-show:
<body ng-app>
<div ng-controller="Ctrl">
<div class="daily"
ng-repeat="daily in dailies | orderBy:'-date' "
ng-show="filteredEntries.length"
>
{{ daily.date | date:'dd/MM/y' }}
<div class="entry"
ng-repeat="entry in filteredEntries = (daily.entries | filter:{ category: 'B'})"
>
<span>{{ entry.category }}</span>, <span>{{ entry.note }}</span>
</div>
</div>
</div>
</body>
BTW，很好地把问题！
Btw, nicely put question!
这篇关于过滤基于一个子对象属性的NG-重复列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
