Angular JS Magazine

vineri, 26 septembrie 2014

Build Custom Filter on Existing Filter

In Custom and Built-in Filters, you saw how to crop the ATP single ranking list using a custom filter and a built-in filter. This tip has exactly the same effect, but it uses two custom filters. The first custom filter will jump over a number a players and the second custom filter will use the result returned by the first custom filter to apply the built-in limitTo filter:

<!DOCTYPE html>
<html ng-app="atpModule">
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <script src="../angular/angular.min.js"></script>
    <link href="../bootstrap/css/bootstrap.css" rel="stylesheet"/>
    <link href="../bootstrap/css/bootstrap-theme.css" rel="stylesheet"/>
    <script>
        angular.module("atpModule", [])
                .controller("atpCtrl", function ($scope) {
                })
               .filter('jumpRanks', function () {
                    return function (players, ranking) {
                        if (angular.isArray(players) && angular.isNumber(ranking)) {
                            if (ranking > players.length || ranking < 1) {
                                return players;
                            } else {
                                return players.slice(ranking);
                            }
                        }
                    };
                }).filter('cropATPList', function ($filter) {
                    return function (players, ranking, limit) {
                        if (angular.isNumber(limit)) {
                            var skippedRanks = $filter("jumpRanks")(players, ranking);
                            return $filter("limitTo")(skippedRanks, limit);
                        } else {
                            return players;
                        }
                    };
                });
    </script>
</head>
<body>
<div ng-controller="atpCtrl" ng-init="atp=[
     { name: 'Nadal, Rafael (ESP)', rank: 1, age: '28', prizemoney: 66149345 },
     { name: 'Djokovic, Novak (SRB)', rank: 2, age: '27', prizemoney: 70704129 },
     { name: 'Federer, Roger (SUI)', rank: 3, age: '33', prizemoney: 84827704 },
     { name: 'Wawrinka, Stan (SUI)', rank: 4, age: '29', prizemoney: 13155060 },
     { name: 'Ferrer, David (ESP)', rank: 5, age: '32',  prizemoney: 24034072 },
     { name: 'Tsonga, Jo-Wilfried (FRA)', rank: 6, age: '29', prizemoney: 1708240 },
     { name: 'Simon, Gilles (FRA)', rank: 7, age: '29', prizemoney: 760469 },
     { name: 'Lopez, Feliciano (ESP)', rank: 8, age: '33', prizemoney: 1100579 },
     { name: 'Benneteau, Julien (FRA)', rank: 9, age: '32', prizemoney: 617688 },
     { name: 'Verdasco, Fernando (ESP)', rank: 10, age: '30', prizemoney: 689219 }]">

    <div id="atpPanel" class="panel">
        <h3 class="panel-header">ATP SINGLES RANKINGS</h3>
        <table class="table">
            <thead>
            <tr>
                <th>Rank</th>
                <th>Name</th>
                <th>Age</th>
                <th>Prize Money</th>
            </tr>
            </thead>
            <tbody>
            <tr ng-repeat="item in atp | cropATPList:7:3">
                <td>{{item.rank}}</td>
                <td>{{item.name}}</td>
                <td>{{item.age}}</td>
                <td>{{item.prizemoney | currency:"$"}}</td>
            </tr>
            </tbody>
        </table>
    </div>
</div>
</body>
</html>