Angular filtering arrays of data

$scope.currentEvent = Object { item_id: "10535", name: "johnny", user_type: "1",category_id: "5"}, Object { item_id: "10534", name: "smith", user_type: "1",category_id: "6"}, Object { item_id: "10536", name: "Greg", user_type: "1",category_id: "7"};


$scope.users = Object { item_id: "11355", name: "mathew", user_type: "1",category_id: "7"}, Object { item_id: "10336", name: "Greg", user_type: "2",category_id: "7"}, Object { item_id: "10545", name: "powell", user_type: "1",category_id: "7"}, Object { item_id: "10456", name: "micheal", user_type: "3",category_id: "7"};

Require filtering based on user_type

Expected outcome = $scope.validUser = Object { item_id: "11355", name: "mathew", user_type: "1",category_id: "7"},  Object { item_id: "10545", name: "powell", user_type: "1",category_id: "7"};

My attempt: I attempted to use the code below, but it did not work for me 

$scope.validUser = $scope.validUser.filter(function($scope.currentEvent){
    return $scope.validUser.user_type === $scope.currentEvent.user_type;
});

Seeking guidance: How can we resolve this issue?

Furthermore, explain the process of filtering data in AngularJS.

javascriptangularjs

Answer №1

const matchingUsers = users.filter(function(user){
    return user.user_type === currentEvent.user_type;
});
  • Make sure to filter on the users array, not validUser.
  • The callback function argument represents the object for the current iteration, so avoid using $scope within it.

Answer №2

You made a mistake in the code within the .filter function. The correct way to do it is shown below. Make sure to iterate over the $scope.users object to filter out the matching user_type property.

$scope.validUser = $scope.users.filter(function(item){ //<- don't use `$scope` here
    return $scope.validUser.user_type === item.user_type;
});

To achieve this using the angular $filter API:

$scope.validUser = $filter('filter')( $scope.users, {
   user_type: $scope.currentEvent.user_type 
}, true);

Answer №3

Check out this filter creation example:

.filter('customSearchFilter', function() {
    return function(input, searchItem) {
        var result = [];
        if (searchItem) {
            angular.forEach(input, function(item) {
                if (item.title.toLowerCase().indexOf(searchItem.toLowerCase()) !== -1) {
                    result.push(item);
                }
            });
        } else {
            result = input;
        }
        return result;
    };
})

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