AngularJS | ng-options Directive

The ng-options Directive in AngularJS is used to build and bind HTML element with options to a model property. It is used to specify <options> in a <select> list. It is designed specifically to populate the items of a dropdown list. It is supported by <supported> element.

Syntax:

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

Example 1: This example uses ng-options Directive to display the option element.

<!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> 
    <h2>ng-options Directive</h2>                              
      
    <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><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:
Before selecting the element:
ngoptions
After selecting the element:

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

<!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> 
    <h2>ng-options Directive</h2>                                
      
    <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><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> 

Output:
Before selecting hide element:
ngoptions
After selecting hide element:

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