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javascriptangularjsarraysangular-filters

How to filter ng-repeat with values NOT IN another array in Angular?

Is there any way to use an Angular filter to compare value with every value from an array?

Categories: <span ng-repeat="c in i.categories | filter: '!'+'myArray' ">{{c}}</span>

I would like to display values from i.categories that are not in myArray:

$scope.i = {
  categories: [
    "Europe & Eurasia",
    "Featured",
    "Headlines",
    "Middle East",
    "News",
    "NEWS BY TOPIC",
    "News Categories",
    "REGIONAL NEWS"
  ]
};

$scope.myArray = ['Featured', 'Headlines', 'News'];

I want to get everything from c which is not contained in the myArray.

I've tried with writing some functions, but I get my app really slow, because of a lot requests.

So, can I just somehow pass my array, and let Angular goes through every single item in that array and compare it with the current value?

Solution

  • You can try to use a custom filter, like the following:

    angular.module('myApp', []).filter('notInArray', function($filter) {
    return function(list, arrayFilter) {
        if(arrayFilter) {
            return $filter("filter")(list, function(listItem) {
                return arrayFilter.indexOf(listItem) == -1;
            });
        }
    };
});

    Use it like this:

    <div ng-repeat='c in i.categories | notInArray:myArray'>{{c}}</div>

    JSFiddle demo

    angular.module('Test', []).filter('notInArray', function($filter) {
    return function(list, arrayFilter) {
        if(arrayFilter) {
            return $filter("filter")(list, function(listItem) {
                return arrayFilter.indexOf(listItem) == -1;
            });
        }
    };
});

function Ctrl($scope) {
  $scope.i = {categories: [
      "Europe & Eurasia",
      "Featured",
      "Headlines",
      "Middle East",
      "News",
      "NEWS BY TOPIC",
      "News Categories",
      "REGIONAL NEWS"
  ]};
  
  $scope.myArray = ['Featured', 'Headlines', 'News'];
}
    <!DOCTYPE html>
<html ng-app='Test'>
<head>
  <script src="http://code.angularjs.org/1.1.1/angular.min.js"></script>
  <meta charset=utf-8 />
</head>
<body ng-controller='Ctrl'>
  <div ng-repeat='c in i.categories | notInArray:myArray'>{{c}}</div>
</body>
</html>