Question

<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，并附有许多读者。我想得到'最近'的读者。

created_at字段具有将用户标识为最近的值。但上面的代码给了我最老的读者。所以订单需要反转？有没有办法按降序排序？

Answer 1

根据documentation，您可以使用reverse参数。

filter:orderBy(array, expression[, reverse]);

将过滤器更改为：

orderBy: 'created_at':true

Answer 2

您可以在orderBy中使用' - '作为参数的前缀，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>

过滤器orderBy的文档中也说明了这一点。

Answer 3

也许这对某人有用：

就我而言，我得到了一个对象数组，每个对象都包含一个由Mongoose设置的日期。

我用过：

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。

Answer 4

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>

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上：http://jsfiddle.net/agjqN/

Answer 5

降序按日期排序

这将有助于按日期降序过滤记录。

$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>

Answer 6

在我的情况下，orderBy由选择框决定。我更喜欢Ludwig的回复，因为您可以在选择选项中设置排序方向：

        $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>

Answer 7

参见w3schools样本： 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>

Answer 8

我的建议使用moment（）如果它们是字符串值，则易于管理日期

//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"

Answer 9

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>

AngularJs中按日期降序排序

9 个答案: