javascript - 如何在 ng-repeat 中对 JSON 数据进行排序？

Question

我正在获取服务器响应并绑定(bind)这些数据以使用 ng-repeat 查看。现在我想按 priceList 和 name 对这些数据进行排序。我可以使用 orderBy 对名称进行排序，但不能使用 priceList。我想根据 priceList 对产品进行排序。按名称排序会改变列表的顺序，而按 priceList 排序只会影响每个 category 的 products 的顺序。它会影响显示类别的顺序。请帮我解决这个问题。
我的代码:

<div ng-controller="Ctrl">
    <pre>Sorting predicate = {{predicate}};</pre>
    <hr/>
    <table class="friend">
        <tr>
            <th><a href="" ng-click="predicate = 'name'; reverse=false">Name</a>
            </th>
            <th><a href="" ng-click="predicate = 'priceList'>price</a></th>
        </tr>

    </table>


<div ng-repeat="data in _JSON[0].categories | orderBy:predicate">
       <div ng-repeat="vals in data.itemTypeResults |orderBy:'partTerminologyName'" id="{{vals.partTerminologyName}}">
`<h4 style="background-color: gray">{{vals.partTerminologyName}} : Position :{{vals.position}}</h4>`<br>


<div ng-repeat="val in vals.products">
    <b> Quantity:{{val[0].perCarQty}}</b><br>
    <b> part:{{val[0].partNo}}</b><br>
    <b>sku:{{val[0].sku}}</b><br>
    <b> qtyInStock:{{val[0].qtyInStock}}</b><br>
    <b> priceList:{{val[0].priceList}}</b><br>
    <b>priceSave:{{val[0].priceSave}}</b><br>
    <b> qtyDC:{{val[0].qtyDC}}</b><br>
    <b> qtyNetwork:{{val[0].qtyNetwork}}</b><br>
    <b> priceCore:{{val[0].priceCore}}</b><br>
        </div>
</div>      
    </div>

JS:

$scope._JSON = [
        {"categories":
            [
                {"id":14061,"name":"Drive Belts",
                    "itemTypeResults":[
                        {"partTerminologyName":"Serp. Belt",
                            "position":"Main Drive",
                            "products":{
                                "5060635":[
                                    {"perCarQty":2,"partNo":"5060635",
                                    "sku":"20060904","qtyInStock":2,"qtyNetwork":4,
                                    "qtyDC":6,"priceList":19.15,"priceSave":3.29,
                                    "priceCore":10.0}
                                ],
                                "635K6":[
                                    {"perCarQty":9,"partNo":"635K6",
                                        "sku":"10062449","qtyInStock":2,"qtyNetwork":4,
                                        "qtyDC":6,"priceList":18.15,"priceSave":3.21,"priceCore":10.0}
                                ]
                            }
                        }
                    ]
                },
                {"id":2610,"name":"Drive Belt Tensioners, Idlers, Pulleys & Components",
                    "itemTypeResults":[
                        {"partTerminologyName":"Drive Belt Tensioner Assembly",
                        "position":"N/A",
                            "products":{
                                "950489A":[
                                    {"perCarQty":4,"partNo":"950489A",
                                        "sku":"10150833","qtyInStock":2,"qtyNetwork":4,
                                        "qtyDC":6,"priceList":18.15,"priceSave":3.21,"priceCore":10.0
                                    }
                                ]
                            }},
                        {"partTerminologyName":"Drive Belt Idler Pulley","position":"N/A",
                            "products":{
                                "89161":[
                                    {"perCarQty":1,"partNo":"89161",
                                    "sku":"99995959","qtyInStock":2,"qtyNetwork":4,
                                    "qtyDC":6,"priceList":17.15,"priceSave":3.21,"priceCore":10.0}
                                ],
                                "951373A":[
                                    {"perCarQty":2,"partNo":"951373A","pla":"LTN",
                                    "plaName":"Litens",
                                    "sku":"10150926","qtyInStock":2,"qtyNetwork":4,
                                        "qtyDC":6,"priceList":18.15,"priceSave":3.21,"priceCore":10.0}
                                ]
                            }
                        }
                    ]
                }
            ]
        }
    ];
    $scope.predicate = '';

fiddle :Fiddle

Answer 1

您可能需要定义一个非常好的排序器函数，或者在它们被 ng-repeat 解释之前对您的 products 进行排序。我使用 underscore.js(或 lodash)创建了排序函数。

您可以查看 demo (或更新的 demo )。产品首先按类别排序，然后在每个类别中按价格排序。

<!-- in html -->
<button ng-click="sortFn=sortByPrice">Sort By Price</button>
<button ng-click="sortFn=doNotSort">Do not Sort</button>
...
<div ng-repeat="val in sortFn(vals.products)">
  ...

// in js
$scope.sortByPrice = function(products) {
  return _.sortBy(products, function(product) {
    return product.length > 0 ? product[0].priceList : 0;
  });
};

$scope.doNotSort = function(products) {
  return products;
};

$scope.sortFn = $scope.doNotSort; // do not sort by default

顺便说一句:您正在直接调用 val[0]，这是非常危险的，如果产品不包含任何元素，您的代码将会中断。我的代码不会 ;-)

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更新 1

作者向我求更纯Angular方式的解决方案。

这是我的答案:我认为我的解决方案完全是 Angular 的方式。通常你可以实现一个过滤器(类似于 orderBy)来包装我的 sortByPrice。为什么我不这样做，因为你有 ng-click 来切换你的订单过滤器。我宁愿将控制逻辑放入 Controller 中，而不是作为 View 的一部分。当您的项目不断增长时，这将更难维护。

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更新 2

好的，为了使 +50 值得，这是您想要的过滤器版本，(用我的大脑编译器输入)请检查 fiddle