将内联ng重复过滤器转换为自定义过滤器 - angularjs

Question

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp" ng-controller="myCtrl as vm">
  <form class="col2">
    <label for="filter-online">
    Filter by Online 
  </label>
    <div class="select">
      <select id="filter-online" ng-model="vm.online" class="form-control" ng-options="online for online in vm.onlines">
        <option value="">All</option>
      </select>
    </div>
  </form>
  <form class="col2">
    <label for="filter-productType">
    Filter by Product Type
  </label>
    <div class="select">
      <select id="filter-productType" ng-model="vm.productType" class="form-control" ng-options="productType for productType in vm.productTypes">
      <option value="">All</option>
    </select>
    </div>
  </form>
  <table style="margin-top: 30px">
    <tr ng-repeat="lim in vm.stockLimits | filter:{online:vm.online || undefined, productType: vm.productType || undefined}">
      <td>{{lim.online}}</td>
      <td>{{lim.productType}}</td>
    </tr>
  </table>
</div>
angular.module("myApp", [])
  .controller("myCtrl", function($scope) {
    var vm = this;
    vm.onlines = ["Men", "Kids", "Ladies"];
    vm.productTypes = ["Shirt", "Shoe", "Belt", "Top"];
    vm.stockLimits = [{
      id: 1,
      online: "Men",
      productType: "Shirt"
    }, {
      id: 2,
      online: "Men",
      productType: "Shoe"
    }, {
      id: 3,
      online: "Kids",
      productType: "Belt"
    }, {
      id: 4,
      online: "Ladies",
      productType: "Top"
    },
    {
      id: 5,
      online: "Kids",
      productType: null
    }]
  })

我想声明自定义过滤器以过滤在线和产品类型，并从角度 html 模板调用自定义过滤器。上面的内联过滤器工作正常，但我期待将内联过滤器转换为自定义过滤器。实际上想从html页面移动过滤功能。注意：产品类型可以为空。

Answer 1

您可以

按照以下方式定义自定义过滤器

angular.module("myApp").filter('productFilter', function() {
    return function(items, filterOptions) {
        if (!items) {
            return []
        }
        return items.filter(function(item) {
            var isOnlinePassed = filterOptions.online ? (item.online === filterOptions.online) : true,
                isProductTypePassed = filterOptions.productType ? (item.productType === filterOptions.productType) : true;
            return isOnlinePassed && isProductTypePassed;
        })
    }
})

然后在模板中使用过滤器，例如：

  <table style="margin-top: 30px">
    <tr ng-repeat="lim in vm.stockLimits | productFilter:{online:vm.online , productType: vm.productType}">
      <td>{{lim.online}}</td>
      <td>{{lim.productType}}</td>
    </tr>
  </table>