ng-repeat with track by and filter and orderBy not

问题:

I have this code.

http://jsfiddle.net/0tgL7u6e/

JavaScript

var myApp = angular.module('myApp',[]);

function MyCtrl($scope) {
    $scope.nameFilter = '';
    $scope.contacts = [
        {name: 'GHI'},
        {name: 'DEF'},
        {name: 'ABC'},
        {name: 'JKL'}
    ];
}

View

<div ng-controller="MyCtrl">
    <div><input type="text" ng-model="nameFilter" placeholder="Search..." /></div>
    <p ng-repeat="contact in contacts track by $index | filter: nameFilter | orderBy: name">{{ contact.name }}</p>
</div>

I don't know why the order is not working and why the filter is not working.

At another question, I've read about something that objects can't be filtered or ordered. But I have an array of the objects above. Also, it should work!?

What's the problem?

回答1:

To use tracking with filters, the track by expression has to be added after the filter.

<p ng-repeat="contact in contacts | orderBy: 'name' | filter: nameFilter  track by $index">{{ contact.name }}</p>

Here is the working fiddle

回答2:

you have to change the code to the following one

<div ng-controller="MyCtrl">
    <div><input type="text" ng-model="nameFilter" placeholder="Search..." /></div>
    <p ng-repeat="contact in contacts  | orderBy: name | filter: nameFilter track by $index ">{{ contact.name }}</p>
</div>