Attempting to craft a multi-filter feature using AngularJS that will allow for the precise filtering of JSON data based on both month and year identifiers

I have integrated AngularJS into the RoR framework and am working on creating a multi-filter for the "ng-repeat" function to filter JSON data based on "month_id" and "year_id".

Here is the current code:

JSON:

[
  {  "date":"October 4, 2015",
     "month_id":"10",
     "year_id":"2015",
     "name":"Chris",
     "title":"Painter",
     "company":"Freelancer",
     "description":"Lorem ipsum dolor sit amet, consectetur adipiscing elit." },

    { "date":"October 3, 2015",
      "month_id":"10",
      "year_id":"2015",
      "name":"Rebecca",
      "title":"Writer",
      "company":"John H. Hickenloop",
      "description":"Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium." },

    { "date":"October 22, 2014",
      "month_id":"10",
      "year_id":"2014",
      "name":"Josh",
      "title":"Riddler",
      "company":"Florida Museum",
      "description":"At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi." }
]

Controller:

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

myApp.controller("MyController", function MyController($scope, $http){
    $http.get("/assets/data.json").success(function(data){
    $scope.artists = data;

      String.prototype.trunc = String.prototype.trunc ||
      function(n){
      
      return this.length >n ? this.substr(0,n-1)+'...' : this;
    };
    $scope.myFilter = function(){
      var currentDate = new Date;
      return year_id === currentDate.getFullYear() && month_id === (currentDate.getMonth() + 1);
      };
    });
  });

HTML:

<div ng-controller="MyController">
  <ul>
   <li ng-repeat="item in artists | filter: myFilter">
     <h1>{{item.date}}</h1>
     <p>{{ item.description.trunc(100) }}</p>
   </li>
  </ul>
</div>

Answer №1

One of the key issues you are facing is the comparison of numbers with strings and the use of the strict comparison operator (remember, '2' !== 2). Consider utilizing the .toString() method in your filter function when working with currentDate.getFullYear() and currentDate.getMonth(). Alternatively, you can opt for the less strict comparison operator, ==.

'2' == 2; // true
'2' === 2; // false

An Angular approach to solving this problem would involve creating a custom filter separate from your controller, ensuring reusability across your application. Detailed documentation on writing custom filters can be found at https://docs.angularjs.org/guide/filter. Here's an example implementation:

myApp
.controller('MyController', function MyController($scope, $http) {
    /** YOUR CODE HERE */
})
.filter('thisMonth', [function() {
    return function(array) {
        var results = [],
            today   = new Date(),
            month   = (today.getMonth() + 1).toString(),
            year    = today.getFullYear().toString();

        angular.forEach(array, function(item, index) {
           if (item.month_id === month && item.year_id === year) {
               this.push(item);
           } 
        }, results);

        return results;
    };
}]);

You can then easily utilize this filter in your ng-repeat like so:

<ul>
    <li ng-repeat="item in items|thisMonth">{{ item.date }}</li>
</ul>

Alternatively, in your controller, you could apply the filter using:

$scope.sortedItems = $filter('thisMonth')($scope.items);

EDIT: If you choose the latter option, remember to include $filter as a dependency.

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