我们可以在 angular js 中使用自定义过滤器过滤嵌套的 json 数据吗

Question

我是 angular js 的新手，正在尝试在 angular js 中过滤嵌套的 json 数据（基本上我想根据用户输入显示过去几天的日期）使用自定义过滤器。基本上我正在尝试使用自定义 filter.I 过滤 json 中的日期对象我不确定我们是否可以使用我当前的代码过滤日期对象之类的嵌套对象，或者我可能需要更改我当前的实现。

我之前在日期为字符串格式时就这样工作了，而且工作正常 http://plnkr.co/edit/5IhJYSXvqa5nwd87y8kD?p=preview

但是当我尝试嵌套 json 日期格式时它不起作用，或者其他 json 格式的读数我无法使其工作。我正在尝试找出一种使用自定义 filter.Any 帮助过滤嵌套 json 对象（数据中的日期或其他参数）的方法，我们将不胜感激。这是一个 plunker link http://plnkr.co/edit/en36loBKQ2DAnOcbwe8v?p=preview`

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

app.controller('MainCtrl', function($scope) {
  $scope.sensordata = [{
    id: 'id:1',
    name: 'Rob',
    "ValidationDate": {
      "$date": "2015-02-20 18:00:05-0400"
    },
    "Temp": 42
    
    
    
    app.filter('tempo', function() {
  return function(items, field, value) {
    var filtered = [];

    var newdate = new Date().setDate(new Date().getDate() - value);

    angular.forEach(items, function(item) {
      if (new Date(item[field]) > newdate) {
        filtered.push(item);
      }
    });
    return filtered;
  };
});

<body ng-controller="MainCtrl">
  Number of days before today
  <input type="number" ng-model="filter.value">
  <p id="demo">Showing data for last {{ filter.value }} days</p>
  Filtered list:
  <ul>
    <li ng-repeat="s in sensordata | tempo:'ValidationDate.$date':filter.value">{{s.id}} {{s.ValidationDate.$date|date}} {{s.name}} {{s.Temp}}
  </ul>
</body>

`

Answer 1

您的日期类型是String，您最好将它们更改为JavaScript中的时间戳或日期对象。

有一些示例代码：

<span ng-non-bindable>{{1288323623006 | date:'medium'}}</span>:
<span>{{1288323623006 | date:'medium'}}</span><br>
<span ng-non-bindable>{{1288323623006 | date:'yyyy-MM-dd HH:mm:ss Z'}}</span>:
<span>{{1288323623006 | date:'yyyy-MM-dd HH:mm:ss Z'}}</span><br>
<span ng-non-bindable>{{1288323623006 | date:'MM/dd/yyyy @ h:mma'}}</span>:
<span>{{'1288323623006' | date:'MM/dd/yyyy @ h:mma'}}</span><br>
<span ng-non-bindable>{{1288323623006 | date:"MM/dd/yyyy 'at' h:mma"}}</span>:
<span>{{'1288323623006' | date:"MM/dd/yyyy 'at' h:mma"}}</span><br>

Answer 2

发现我的问题被搁置了很长时间。一个简单的更改是 javascript 就可以解决问题，嵌套的 json 数据可以使用 .在 plunker.

下面的示例中的符号，如 item.ValidationDate.$date

http://plnkr.co/edit/NEBYrQeaLX84sCSNDCzV?p=preview

// Code goes here

// Code goes here
//

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

app.controller('MainCtrl', function($scope) {
  $scope.sensordata = [
    {id:'id:1',name:'Rob',"ValidationDate": {"$date":"2015-04-12 18:00:05-0400"},"readings" : [ {"Temp" : 20 }]},
    {id:'id:2',name:'Rob',"ValidationDate": {"$date":"2015-04-13 18:00:05-0400"},"readings" : [ {"Temp" : 25 }]},
    {id:'id:3',name:'Rob',"ValidationDate": {"$date":"2015-04-11 18:00:05-0400"},"readings" : [ {"Temp" : 26 }]}
   
  ];
  
  $scope.filter = { value:100};
    
});

app.filter('tempo', function() {
    return function( items, field, value) {
      var filtered = [];
      
var newdate=new Date().setDate(new Date().getDate()-value);
//var tempp=26-value;

      angular.forEach(items, function(item) {
        //if (new Date(item[field]) > newdate){
        //new logic of accessing value by function
        //if (item.readings[0].Temp >tempp ){
        if (new Date(item.ValidationDate.$date) >newdate ){
          
          filtered.push(item);
        }
      });
      return filtered;
    };
});

<!DOCTYPE html>
<html ng-app="tempfilter">
  
  <head lang="en">
    <meta charset="utf-8">
    <title>DateFilter</title>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js"></script>
    <script>
      document.write('<base href="' + document.location + '" />');
    </script>
    <script src="script.js"></script>
 
</head>
  
<body ng-controller="MainCtrl">
Number of days before today<input type="number"  ng-model="filter.value">
  <p id="demo">Showing data for last {{ filter.value }} days</p>
  Filtered list:
 <ul>
    <li ng-repeat="s in sensordata | tempo:'Date':filter.value">{{s.id}}
     {{s.ValidationDate.$date|date}}
    {{s.name}}
    {{s.readings[0].Temp}}
  </ul>
 
 Full List:
 <ul>
    <li ng-repeat="s in sensordata ">{{s.id}}
      {{s.ValidationDate.$date|date}}
      {{s.name}}
     {{s.readings[0].Temp}}
    </li>
  </ul>
</body>

</html>

我们可以在 angular js 中使用自定义过滤器过滤嵌套的 json 数据吗

Can we filter nested json data using custom filter in angular js

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angularjs-filter