Angularjs 如何在ng repeat angular中过滤后聚合对象属性
我正在使用Angular 1.2.16并过滤如下对象列表:Angularjs 如何在ng repeat angular中过滤后聚合对象属性,angularjs,Angularjs,我正在使用Angular 1.2.16并过滤如下对象列表: <li ng-repeat="item in filteredItems = (items | filter:query)"> {{item.title}} </li> 使用“b”过滤后,angular将“filteredItems”设置为 我要做的是计算每种优先级类型、后过滤器的出现次数,并将它们打印出来。例如,上述场景的输出将打印priority-1=2,priority-2=1,然后在应用过滤器“b”
<li ng-repeat="item in filteredItems = (items | filter:query)">
{{item.title}}
</li>
使用“b”过滤后,angular将“filteredItems”设置为
我要做的是计算每种优先级类型、后过滤器的出现次数,并将它们打印出来。例如,上述场景的输出将打印priority-1=2,priority-2=1
,然后在应用过滤器“b”后变为priority-1=1,priority-2=1
我应该怎么做呢
我尝试创建一个新的控制器,然后使用$scope.$parent.filteredItems
,但是filteredItems块不会动态更新
这里有一个plunkr最接近于回答我的问题,它添加了一个自定义指令,在ng repeat完成后触发一个事件。然而,它比我想要的要复杂一点
我的最后一个方法是向控制器添加一个自定义的$filter,当输入发生变化时会触发它,并最终创建一个可以打印出来的摘要对象。我们可以找到那个劫掠者
HTML:
更简单的方法,但仍然不理想: html:
选中
$watch
,您不需要另外两个控制器。
var items = [ { title: "foo", priority: 1 },
{ title: "bar", priority: 2 },
{ title: "bla", priority: 1 } ];
filteredItems == [ { title: "bar", priority: 2 },
{ title: "bla", priority: 1 } ];
<input ng-model="query" type="text" ng-change="myFilter(query)" />
<ul>
<li ng-repeat="item in items">
<pre>{{item}}</pre></li>
</ul>
<h3>Summary of items</h3>
<p >
Priority-1: {{summary.p1}}<br>
Priority-2: {{summary.p2}}
</p>
</body>
var app = angular.module('app', []);
app.controller('ParentCtrl', ['$scope', '$filter',
function($scope, $filter) {
$scope.originalItems = [{
title: "foo",
priority: 1
}, {
title: "bar",
priority: 2
}, {
title: "bla",
priority: 1
}];
$scope.items = $scope.originalItems;
var summarize = function(items) {
var summary = {
p1: 0,
p2: 0
};
for (var i in items) {
switch (items[i].priority) {
case 1:
summary.p1++;
break;
case 2:
summary.p2++;
break;
}
}
return summary;
};
$scope.myFilter = function(query) {
$scope.items = $filter('myFilter')($scope.originalItems, query);
$scope.summary = summarize($scope.items);
}
$scope.summary = summarize($scope.items);
}
]);
app.filter('myFilter', ['$filter',
function($filter) {
return function(items, query) {
return $filter('filter')(items, query);
};
}
]);
<body ng-controller="ParentCtrl">
<input ng-model="query" type="text"/>
<ul>
<li ng-repeat="item in items | filter : query">
<pre>{{item}}</pre></li>
</ul>
<h3>Summary of items</h3>
<p >
Priority-1: {{items | filter : query | sumFilter: '1'}}<br>
Priority-2: {{items | filter : query | sumFilter: '2'}}
</p>
</body>
app.filter('sumFilter', function() {
return function(items, value) {
var summary = 0;
for (var i in items) {
if (items[i].priority == value) {
summary++;
}
}
return summary;
}
});