<div class="recent" ng-repeat="reader in
(filteredItems = (book.reader | orderBy: 'created_at' | limitTo: 1))">
</div>
所以这本书来自rest api,它有很多读者。我想获得“最近”的读者。
该created_at
字段具有将用户标识为最近的值。但是上面的代码给了我最老的读者。所以需要颠倒顺序吗?有没有办法按降序排序?
<div class="recent" ng-repeat="reader in
(filteredItems = (book.reader | orderBy: 'created_at' | limitTo: 1))">
</div>
所以这本书来自rest api,它有很多读者。我想获得“最近”的读者。
该created_at
字段具有将用户标识为最近的值。但是上面的代码给了我最老的读者。所以需要颠倒顺序吗?有没有办法按降序排序?
根据文档,您可以使用该reverse
参数。
filter:orderBy(array, expression[, reverse]);
将过滤器更改为:
orderBy: 'created_at':true
您可以在参数前面orderBy
加上“-”以降序而不是升序。我会这样写:
<div class="recent"
ng-repeat="reader in book.reader | orderBy: '-created_at' | limitTo: 1">
</div>
这也在过滤器orderBy的文档中进行了说明。
也许这对某人有用:
就我而言,我得到了一组对象,每个对象都包含 Mongoose 设置的日期。
我用了:
ng-repeat="comment in post.comments | orderBy : sortComment : true"
并定义了函数:
$scope.sortComment = function(comment) {
var date = new Date(comment.created);
return date;
};
这对我有用。
还有一个代码示例:
<div ng-app>
<div ng-controller="FooController">
<ul ng-repeat="item in items | orderBy:'num':true">
<li>{{item.num}} :: {{item.desc}}</li>
</ul>
</div>
</div>
和 JavaScript:
function FooController($scope) {
$scope.items = [
{desc: 'a', num: 1},
{desc: 'b', num: 2},
{desc: 'c', num: 3},
];
}
会给你:
3 :: c
2 :: b
1 :: a
在 JSFiddle:http: //jsfiddle.net/agjqN/
降序按日期排序
它将有助于按降序过滤日期的记录。
$scope.logData = [
{ event: 'Payment', created_at: '04/05/17 6:47 PM PST' },
{ event: 'Payment', created_at: '04/06/17 12:47 AM PST' },
{ event: 'Payment', created_at: '04/05/17 1:50 PM PST' }
];
<div ng-repeat="logs in logData | orderBy: '-created_at'" >
{{logs.event}}
</div>
在我的例子中,orderBy 是由一个选择框决定的。我更喜欢路德维希的回应,因为您可以在选择选项中设置排序方向,如下所示:
$scope.options = [
{ label: 'Title', value: 'title' },
{ label: 'Newest', value: '-publish_date' },
{ label: 'Featured', value: '-featured' }
];
标记:
<select ng-model="orderProp" ng-options="opt as opt.label for opt in options"></select>
<ul>
<li ng-repeat="item in items | orderBy:orderProp.value"></li>
</ul>
查看 w3schools 示例: https ://www.w3schools.com/angular/angular_filters.asp https://www.w3schools.com/angular/tryit.asp?filename=try_ng_filters_orderby_click
然后添加“反向”标志:
<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
<body>
<p>Click the table headers to change the sorting order:</p>
<div ng-app="myApp" ng-controller="namesCtrl">
<table border="1" width="100%">
<tr>
<th ng-click="orderByMe('name')">Name</th>
<th ng-click="orderByMe('country')">Country</th>
</tr>
<tr ng-repeat="x in names | orderBy:myOrderBy:reverse">
<td>{{x.name}}</td>
<td>{{x.country}}</td>
</tr>
</table>
</div>
<script>
angular.module('myApp', []).controller('namesCtrl', function($scope) {
$scope.names = [
{name:'Jani',country:'Norway'},
{name:'Carl',country:'Sweden'},
{name:'Margareth',country:'England'},
{name:'Hege',country:'Norway'},
{name:'Joe',country:'Denmark'},
{name:'Gustav',country:'Sweden'},
{name:'Birgit',country:'Denmark'},
{name:'Mary',country:'England'},
{name:'Kai',country:'Norway'}
];
$scope.reverse=false;
$scope.orderByMe = function(x) {
if($scope.myOrderBy == x) {
$scope.reverse=!$scope.reverse;
}
$scope.myOrderBy = x;
}
});
</script>
</body>
</html>
如果日期是字符串值,我的建议使用 moment() 很容易管理日期
//controller
$scope.sortBooks = function (reader) {
var date = moment(reader.endDate, 'DD-MM-YYYY');
return date;
};
//template
ng-repeat="reader in book.reader | orderBy : sortBooks : true"
var myApp = angular.module('myApp', []);
myApp.filter("toArray", function () {
return function (obj) {
var result = [];
angular.forEach(obj, function (val, key) {
result.push(val);
});
return result;
};
});
myApp.controller("mainCtrl", function ($scope) {
$scope.logData = [
{ event: 'Payment', created_at: '10/10/2019 6:47 PM PST' },
{ event: 'Payment', created_at: '20/10/2019 12:47 AM PST' },
{ event: 'Payment', created_at: '30/10/2019 1:50 PM PST' }
];
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script>
<div ng-app="myApp" ng-controller="mainCtrl">
<h4>Descending</h4>
<ul>
<li ng-repeat="logs in logData | toArray | orderBy:'created_at':true" >
{{logs.event}} - Date : {{logs.created_at}}
</li>
</ul>
<br>
<h4>Ascending</h4>
<ul>
<li ng-repeat="logs in logData | toArray | orderBy:'created_at':false" >
{{logs.event}} - Date : {{logs.created_at}}
</li>
</ul>
</div>