AngularJS ng-options Directive

Last Updated : 01 Aug, 2022

The ng-options Directive in AngularJS is used to build and bind HTML elements with options to a model property. It is used to specify <options> in a <select> list. It is designed specifically to populate the items on a dropdown list. This directive implements an array, in order to fill the dropdown list. It is supported by the <select> element.

Syntax:

<element ng-options="expression"> 
    Content ... 
</element>

Parameter value:

expression: It selects the particular portion of an array to fill the selected element.

Example 1: This example implements the ng-options Directive to display the option element in AngularJS.

HTML

<!DOCTYPE html>
<html>
 
<head>
    <title>ng-options Directive</title>
    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
    </script>
</head>
 
<body ng-app="app" style="text-align: center">
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
   
    <h3>ng-options Directive</h3>
     
      <div ng-controller="geek"
         ng-init="StudentId=1"> Sorting Algorithms:
        <select ng-model="Sorting" ng-options="sort.name as
            sort.name for sort in sorting"></select>
        <br><br><br> Selected sorting algorithm:
        <input type="text" ng-model="Sorting" /> 
    </div>
   
    <script>
        var app = angular.module("app", []);
        app.controller('geek', ['$scope', function($scope) {
            $scope.sorting = [{
                name: 'Merge sort',
                id: 1
            }, {
                name: 'Quick sort',
                id: 2
            }, {
                name: 'Bubble sort',
                id: 3
            }];
        }]);
    </script>
</body>
</html>

Output:

Example 2: This example implements the ng-options Directive to hide or display the element in AngularJS.

HTML

<!DOCTYPE html>
<html>
 
<head>
    <title>ng-options Directive</title>
    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
    </script>
</head>
 
<body ng-app="app"
      style="text-align: center">
    <h1 style="color:green">GeeksforGeeks</h1>
    <h3>ng-options Directive</h3>
    <div ng-controller="geek" ng-init="Id=1"> Choose:
        <select ng-model="hide" ng-options="show.hide
            as show.name for show in HideShow">
        </select>
        <br><br>
        <span ng-hide="hide">
            Check to hide 
            <input type="checkbox"
                    ng-model="hide" />
        </span>
    </div>
    <script>
        var app = angular.module("app", []);
        app.controller('geek', ['$scope', function($scope) {
            $scope.HideShow = [{
                name: 'Hide',
                hide: true,
            }, {
                name: 'Show',
                hide: false
            }];
        }]);
    </script>
</body>
</html>