Making ng-options dynamic in AngularJS

Question

I have an array as follows:

$scope.age = 2;
$scope.people = [{name:"Sam",age:2},{name:"Pam",age:3},{name:"Ham",age:4}]

I want the ng-options to be dynamic i.e., If the age is 2 then show all objects of people in ng-options. If the age is 1 then show object with name as "Sam".

$scope.age can have value either 1 or 2.

How can I do this in AngularJS without writing different block of select statements?

Answer 1

You could bind the select to the result of a function:

<select ng-options="person as person for person in getPersons()">
</select>

Then setup your scope like this:

$scope.age = 2;
$scope.people = [{name:"Sam",age:2},{name:"Pam",age:3},{name:"Ham",age:4}]
$scope.getPersons = function() {
    if ($scope.age = 1)
        return $scope.people.filter(function(item) {
            item.name == "Sam";
        });
    else
        return $scope.people;
};