How to filter multiple values (OR operation) in angularJS

Question

I want to use the filter in angular and want to filter for multiple values, if it has either one of the values then it should be displayed.

I have for

Answer 1

Creating a custom filter might be overkill here, you can just pass in a custom comparator, if you have the multiples values like:

$scope.selectedGenres = "Action, Drama"; 

$scope.containsComparator = function(expected, actual){  
  return actual.indexOf(expected) > -1;
};

then in the filter:

filter:{name:selectedGenres}:containsComparator

Answer 2

Angular Or Filter Module

$filter('orFilter')([{..}, {..} ...], {arg1, arg2, ...}, false)

here is the link: https://github.com/webyonet/angular-or-filter

Answer 3

I wrote this for strings AND functionality (I know it's not the question but I searched for it and got here), maybe it can be expanded.

String.prototype.contains = function(str) {
  return this.indexOf(str) != -1;
};

String.prototype.containsAll = function(strArray) {
  for (var i = 0; i < strArray.length; i++) {
    if (!this.contains(strArray[i])) {
      return false;
    }
  }
  return true;
}

app.filter('filterMultiple', function() {
  return function(items, filterDict) {
    return items.filter(function(item) {
      for (filterKey in filterDict) {
        if (filterDict[filterKey] instanceof Array) {
          if (!item[filterKey].containsAll(filterDict[filterKey])) {
            return false;
          }
        } else {
          if (!item[filterKey].contains(filterDict[filterKey])) {
            return false;
          }
        }
      }
      return true;
    });  
  };
});

Usage:

<li ng-repeat="x in array | filterMultiple:{key1: value1, key2:[value21, value22]}">{{x.name}}</li>

Answer 4

The quickest solution that I've found is to use the filterBy filter from angular-filter, for example:

<input type="text" placeholder="Search by name or genre" ng-model="ctrl.search"/>   
<ul>
  <li ng-repeat="movie in ctrl.movies | filterBy: ['name', 'genre']: ctrl.search">
    {{movie.name}} ({{movie.genre}}) - {{movie.rating}}
  </li>
</ul>

The upside is that angular-filter is a fairly popular library (~2.6k stars on GitHub) which is still actively developed and maintained, so it should be fine to add it to your project as a dependency.

Answer 5

You can use a controller function to filter.

function MoviesCtrl($scope) {

    $scope.movies = [{name:'Shrek', genre:'Comedy'},
                     {name:'Die Hard', genre:'Action'},
                     {name:'The Godfather', genre:'Drama'}];

    $scope.selectedGenres = ['Action','Drama'];

    $scope.filterByGenres = function(movie) {
        return ($scope.selectedGenres.indexOf(movie.genre) !== -1);
    };

}

HTML:

<div ng-controller="MoviesCtrl">
    <ul>
        <li ng-repeat="movie in movies | filter:filterByGenres">
            {{ movie.name }} {{ movie.genre }}
        </li>
    </ul>
</div>

Answer 6

I've spent some time on it and thanks to @chrismarx, I saw that angular's default filterFilter allows you to pass your own comparator. Here's the edited comparator for multiple values:

  function hasCustomToString(obj) {
        return angular.isFunction(obj.toString) && obj.toString !== Object.prototype.toString;
  }
  var comparator = function (actual, expected) {
    if (angular.isUndefined(actual)) {
      // No substring matching against `undefined`
      return false;
    }
    if ((actual === null) || (expected === null)) {
      // No substring matching against `null`; only match against `null`
      return actual === expected;
    }
    // I edited this to check if not array
    if ((angular.isObject(expected) && !angular.isArray(expected)) || (angular.isObject(actual) && !hasCustomToString(actual))) {
      // Should not compare primitives against objects, unless they have custom `toString` method
      return false;
    }
    // This is where magic happens
    actual = angular.lowercase('' + actual);
    if (angular.isArray(expected)) {
      var match = false;
      expected.forEach(function (e) {
        e = angular.lowercase('' + e);
        if (actual.indexOf(e) !== -1) {
          match = true;
        }
      });
      return match;
    } else {
      expected = angular.lowercase('' + expected);
      return actual.indexOf(expected) !== -1;
    }
  };

And if we want to make a custom filter for DRY:

angular.module('myApp')
    .filter('filterWithOr', function ($filter) {
      var comparator = function (actual, expected) {
        if (angular.isUndefined(actual)) {
          // No substring matching against `undefined`
          return false;
        }
        if ((actual === null) || (expected === null)) {
          // No substring matching against `null`; only match against `null`
          return actual === expected;
        }
        if ((angular.isObject(expected) && !angular.isArray(expected)) || (angular.isObject(actual) && !hasCustomToString(actual))) {
          // Should not compare primitives against objects, unless they have custom `toString` method
          return false;
        }
        console.log('ACTUAL EXPECTED')
        console.log(actual)
        console.log(expected)

        actual = angular.lowercase('' + actual);
        if (angular.isArray(expected)) {
          var match = false;
          expected.forEach(function (e) {
            console.log('forEach')
            console.log(e)
            e = angular.lowercase('' + e);
            if (actual.indexOf(e) !== -1) {
              match = true;
            }
          });
          return match;
        } else {
          expected = angular.lowercase('' + expected);
          return actual.indexOf(expected) !== -1;
        }
      };
      return function (array, expression) {
        return $filter('filter')(array, expression, comparator);
      };
    });

And then we can use it anywhere we want:

$scope.list=[
  {name:'Jack Bauer'},
  {name:'Chuck Norris'},
  {name:'Superman'},
  {name:'Batman'},
  {name:'Spiderman'},
  {name:'Hulk'}
];


<ul>
  <li ng-repeat="item in list | filterWithOr:{name:['Jack','Chuck']}">
    {{item.name}}
  </li>
</ul>

Finally here's a plunkr.

Note: Expected array should only contain simple objects like String, Number etc.