javascript - 使用 AngularJS 在对象属性为空时过滤 ng-repeat

Question

我有一个具有多个属性的对象数组。所有这些对象都有一个 object.comment 属性，但有些是用字符串填充的('comment' : 'comment text')，而其他的是空的( 'comment' : '').

我像这样用 ng-repeat 列出结果:

<div class="row msf-row" 
     ng-repeat="record in filteredRecords = (recordlist | filter:dateFilter | filter: search )" 
>

我想要完成的是添加一个复选框过滤器，以仅显示选中复选框时填充 object.comment 属性的结果，以及未选中时的所有结果。

到目前为止，这是我的过滤器的样子:

<form role="form">
            <div class="form-group col-md-3">
              <input type='daterange' 
              placeholder="Date range" 
              class="form-control"
              format="DD/MM/YYYY" 
              ng-model="dates"
              ranges="ranges" />
            </div>

            <div class="form-group col-md-1">
              <input class="form-control" placeholder="Time" ng-model="search.time">
            </div>

            <div class="form-group col-md-1">
              <input class="form-control" placeholder="Car" ng-model="search.car">
            </div>

            <div class="form-group col-md-2">
              <input class="form-control" placeholder="Driver" ng-model="search.driver">
            </div>

            <div class="form-group col-md-2">
              <input class="form-control" placeholder="From" ng-model="search.from">
            </div>

            <div class="form-group col-md-2">
              <input class="form-control" placeholder="Destination" ng-model="search.destination">
            </div>

            <div class="form-group col-md-1">
              <input class="form-control" placeholder="Pax" ng-model="search.pax">
            </div>

            <div class="col-md-1">
              <div class="checkbox">
                <label>
                  <input type="checkbox" 
                         ng-model="search.cancelled" 
                         ng-change="search.cancelled = search.cancelled ? true : undefined"
                  > Cancelled 
                </label>
              </div>
            </div> 

            <div class="col-md-2">
              <div class="checkbox">
                <label>
                  <input type="checkbox" 
                         ng-model="search.comment" 
                         ng-change="search.comment = search.comment ? true : undefined"
                  > Commented records
                </label>
              </div>
            </div>

</form>

如您所见，我已经有一个过滤器可以判断 object.cancelled 是真还是假，但我没能对 object 做同样的事情.comment 为空或有一个字符串。

有什么建议吗？

Answer 1

您可以创建自定义过滤器，请看下面的演示

app.filter('emptyString', [
  function() {
    return function(input, param) {
      if (!param) return input

      var ret = [];
      if (!angular.isDefined(param)) param = true;


      if (param) {
        angular.forEach(input, function(v) {
          if (angular.isDefined(v.comment) && v.comment) {
            v.comment = v.comment.replace(/^\s*/g, '');
            ret.push(v);
          }

        });
      }



      return ret;
    };
  }
])

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

app.controller('homeCtrl', function($scope) {

  $scope.recordlist = [{
      time: "10/11/2014",
      comment: "super"
    }, {
      time: "10/11/20004",
      comment: ""
    }, {
      time: "10/11/2005",
      comment: ""
    }, {
      time: "11/1/2014",
      comment: "that was ok"
    }


  ];


});

app.filter('emptyString', [
  function() {
    return function(input, param) {
      if (!param) return input

      var ret = [];
      if (!angular.isDefined(param)) param = true;


      if (param) {
        angular.forEach(input, function(v) {
          if (angular.isDefined(v.comment) && v.comment) {
            v.comment = v.comment.replace(/^\s*/g, '');
            ret.push(v);
          }

        });
      }



      return ret;
    };
  }
])

<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" type="text/css" />

<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.14/angular.min.js"></script>



<div ng-app="app">
  <div ng-controller="homeCtrl">
    <form role="form">
      <div class="form-group col-md-3">
        <input type='daterange' placeholder="Date range" class="form-control" format="DD/MM/YYYY" ng-model="dates" ranges="ranges" />
      </div>

      <div class="form-group col-md-1">
        <input class="form-control" placeholder="Time" ng-model="search.time">
      </div>

      <div class="form-group col-md-1">
        <input class="form-control" placeholder="Car" ng-model="search.car">
      </div>

      <div class="form-group col-md-2">
        <input class="form-control" placeholder="Driver" ng-model="search.driver">
      </div>

      <div class="form-group col-md-2">
        <input class="form-control" placeholder="From" ng-model="search.from">
      </div>

      <div class="form-group col-md-2">
        <input class="form-control" placeholder="Destination" ng-model="search.destination">
      </div>

      <div class="form-group col-md-1">
        <input class="form-control" placeholder="Pax" ng-model="search.pax">
      </div>

      <div class="col-md-1">
        <div class="checkbox">
          <label>
            <input type="checkbox" ng-model="search.cancelled" ng-change="search.cancelled = search.cancelled ? true : undefined">Cancelled
          </label>
        </div>
      </div>

      <div class="col-md-2">
        <div class="checkbox">
          <label>
            <input type="checkbox" ng-model="search.comment">Commented records
          </label>
        </div>
      </div>

    </form>
    <div class="container">
      <div class="row " ng-repeat="record in filteredRecords = (recordlist |  emptyString : search.comment   )">
        <div class="col-xs-12" <span class="label">{{record.time}} <span> <strong>{{record.comment}}</strong></p> </div>
    </div>
    </div>
  </div>