How to filter multiple values (OR operation) in an

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 example this structure:

An object movie which has the property genres and I want to filter for Action and Comedy.

I know I can do filter:({genres: 'Action'} || {genres: 'Comedy'}), but what to do if I want to filter it dynamically. E.g. filter: variableX

How do I set variableX in the $scope, when I have an array of the genres I have to filter?

I could construct it as a string and then do an eval() but I don't want to use eval()...

Answer 1

I would just create a custom filter. They are not that hard.

angular.module('myFilters', []).
  filter('bygenre', function() {
    return function(movies,genres) {
      var out = [];
      // Filter logic here, adding matches to the out var.
      return out;
    }
  });

template:

<h1>Movies</h1>

<div ng-init="movies = [
          {title:'Man on the Moon', genre:'action'},
          {title:'Meet the Robinsons', genre:'family'},
          {title:'Sphere', genre:'action'}
       ];" />
<input type="checkbox" ng-model="genrefilters.action" />Action
<br />
<input type="checkbox" ng-model="genrefilters.family" />Family
<br />{{genrefilters.action}}::{{genrefilters.family}}
<ul>
    <li ng-repeat="movie in movies | bygenre:genrefilters">{{movie.title}}: {{movie.genre}}</li>
</ul>

Edit here is the link: Creating Angular Filters

UPDATE: Here is a fiddle that has an exact demo of my suggestion.

Answer 2

OPTION 1: Using Angular providered filter comparator parameter

// declaring a comparator method
$scope.filterBy = function(actual, expected) {
    return _.contains(expected, actual); // uses underscore library contains method
};

var employees = [{name: 'a'}, {name: 'b'}, {name: 'c'}, {name: 'd'}];

// filter employees with name matching with either 'a' or 'c'
var filteredEmployees = $filter('filter')(employees, {name: ['a','c']}, $scope.filterBy);

OPTION 2: Using Angular providered filter negation

var employees = [{name: 'a'}, {name: 'b'}, {name: 'c'}, {name: 'd'}];

// filter employees with name matching with either 'a' or 'c'
var filteredEmployees = $filter('filter')($filter('filter')(employees, {name: '!d'}), {name: '!b'});

Answer 3

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.

Answer 4

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 5

you can use searchField filter of angular.filter

JS:

$scope.users = [
 { first_name: 'Sharon', last_name: 'Melendez' },
 { first_name: 'Edmundo', last_name: 'Hepler' },
 { first_name: 'Marsha', last_name: 'Letourneau' }
];

HTML:

<input ng-model="search" placeholder="search by full name"/> 
<th ng-repeat="user in users | searchField: 'first_name': 'last_name' | filter: search">
  {{ user.first_name }} {{ user.last_name }}
</th>
<!-- so now you can search by full name -->

Answer 6

Please try this

var m = angular.module('yourModuleName');
m.filter('advancefilter', ['$filter', function($filter){
    return function(data, text){
        var textArr = text.split(' ');
        angular.forEach(textArr, function(test){
            if(test){
                  data = $filter('filter')(data, test);
            }
        });
        return data;
    }
}]);