<div class="recent" ng-repeat="reader in
(filteredItems = (book.reader | orderBy: 'created_at' | limitTo: 1))">
</div>
So the book comes from rest api and it has many readers attached. I want to get the 'recent' reader.
The created_at field has the value which identifies the user as recent. But the above code gives me the oldest reader. So the order needs to be inversed? Is there some way to have the sorting in descending order?
According to documentation you can use the reverse argument.
filter:orderBy(array, expression[, reverse]);
Change your filter to:
orderBy: 'created_at':true
You can prefix the argument in orderBy with a '-' to have descending order instead of ascending. I would write it like this:
<div class="recent"
ng-repeat="reader in book.reader | orderBy: '-created_at' | limitTo: 1">
</div>
This is also stated in the documentation for the filter orderBy.
Perhaps this can be useful for someone:
In my case, I was getting an array of objects, each containing a date set by Mongoose.
I used:
ng-repeat="comment in post.comments | orderBy : sortComment : true"
And defined the function:
$scope.sortComment = function(comment) {
var date = new Date(comment.created);
return date;
};
This worked for me.
And a code example:
<div ng-app>
<div ng-controller="FooController">
<ul ng-repeat="item in items | orderBy:'num':true">
<li>{{item.num}} :: {{item.desc}}</li>
</ul>
</div>
</div>
And the JavaScript:
function FooController($scope) {
$scope.items = [
{desc: 'a', num: 1},
{desc: 'b', num: 2},
{desc: 'c', num: 3},
];
}
Will give you:
3 :: c
2 :: b
1 :: a
On JSFiddle: http://jsfiddle.net/agjqN/
Descending Sort by date
It will help to filter records with date in descending order.
$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>
In my case, the orderBy is determined by a select box. I prefer Ludwig's response because you can set the sort direction in the select options as such:
$scope.options = [
{ label: 'Title', value: 'title' },
{ label: 'Newest', value: '-publish_date' },
{ label: 'Featured', value: '-featured' }
];
markup:
<select ng-model="orderProp" ng-options="opt as opt.label for opt in options"></select>
<ul>
<li ng-repeat="item in items | orderBy:orderProp.value"></li>
</ul>
see w3schools samples: https://www.w3schools.com/angular/angular_filters.asp https://www.w3schools.com/angular/tryit.asp?filename=try_ng_filters_orderby_click
then add the "reverse" flag:
<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
<body>
<p>Click the table headers to change the sorting order:</p>
<div ng-app="myApp" ng-controller="namesCtrl">
<table border="1" width="100%">
<tr>
<th ng-click="orderByMe('name')">Name</th>
<th ng-click="orderByMe('country')">Country</th>
</tr>
<tr ng-repeat="x in names | orderBy:myOrderBy:reverse">
<td>{{x.name}}</td>
<td>{{x.country}}</td>
</tr>
</table>
</div>
<script>
angular.module('myApp', []).controller('namesCtrl', function($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>
My advise use moment() is easy to manage dates if they are strings values
//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>