Progressive Dropdown Options - Multiple Paths

As a newcomer to AngularJS, I have come across various implementations of cascading dropdown lists that do not meet my requirements. I am unsure how to modify or extend them to achieve the functionality I desire.

I would appreciate it if you could provide guidance or an example that could benefit many others facing similar challenges.

Functionality Needed: Multiple Dropdown lists with relational data. On selection change, update all other dropdowns based on the selection.

For Example 1: Have 3 dropdowns - Colleges, Majors, and Degrees.

Typically, when a college is selected, the majors from that college are displayed, and when a major is chosen, the degrees associated with the major are shown. What I need is for the majors to filter colleges, or when selecting PHD in the third dropdown, remove any colleges without PHD programs or majors without a PHD degree.

Example 2: Brand (BMW, Audi, Mercedes), Style (Convertible, Sedan, Minivan), Price Range (10k-20k, 20k-30k, 30k-50k).

When selecting a brand, display its styles and price ranges. When choosing a style, show brands offering that style and eliminate price ranges that do not fall within that category. Finally, when picking a price range, show brands and styles falling within that specific range.

javascriptangularjsdrop-down-menufiltercascading

Answer №1

Do you find this link useful?

http://example.com/annavester/Zd6uX/

function AjaxCtrl($scope) {
    $scope.countries = ['usa', 'canada', 'mexico', 'france'];
    $scope.$watch('country', function(newVal) {
        if (newVal) $scope.cities = ['Los Angeles', 'San Francisco'];
    });
    $scope.$watch('city', function(newVal) {
        if (newVal) $scope.suburbs = ['SOMA', 'Richmond', 'Sunset'];
    });
}

function StaticCtrl($scope) {
    $scope.countries = {
        'usa': {
            'San Francisco': ['SOMA', 'Richmond', 'Sunset'],
            'Los Angeles': ['Burbank', 'Hollywood']
        },
        'canada': {
            'People dont live here': ['igloo', 'cave']
        }
    };
}

Alternatively, you can use the ng-change attribute:

https://example.com/a/14386972/3202657

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