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Why does AngularJS include an empty option in select ?

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  • Last Updated : 01 Aug, 2022

AngularJS is a Javascript framework containing several built-in functionalities, that intend to make the development easier and more efficient for the developers. The dropdown is one of them. A dropdown is a GUI element that enables the user to choose one value from a list of values. When a drop-down is active, a list of values gets displayed to the user, out of which one value can be selected at a time. After a value is selected, the drop-down gets back to its default state. However, while working with the AngularJS dropdown, it was observed that the first option in the select dropdown is always empty. Have a look at the following example for a better understanding. 

Example 1: The below example illustrates an empty option in the select menu in AngularJS.

HTML




<!DOCTYPE html>
<html>
  
<head>
    <script src=
            integrity=
"sha256-ZYJ4XH6kZrqD1MlZWZZmQj6MBe/TvysMc33LPchVuo8=" 
            crossorigin="anonymous">
    </script>
</head>
  
<body>
    <h1 style="color:green;">
        GeeksforGeeks
    </h1>
    <h3>
        Dropdown of Programming Languages
    </h3>
    <div ng-App="myApp" ng-controller="MyCtrl">
        <select ng-model='form.type'
             ng-options='name.val as name.label for name in allNames'>
        </select>
    </div>
    <p> Notice that the first option in the dropdown in empty. </p>
    <script>
        var myApp = angular.module('myApp', []);
        function MyCtrl($scope) {
            $scope.allNames = [{
                label: 'C',
                val: 'C Language'
            }, {
                label: 'C++',
                val: 'C++ Language'
            }, {
                label: 'Java',
                val: 'Java Language'
            }, {
                label: 'Python',
                val: 'Python Language'
            }, {
                label: 'JavaScript',
                val: 'JavaScript Language'
            }];
        }
    </script>
</body>
  
</html>

Output:  

 

Explanation and Correction: Generally, a list of options are transferred to ng-option directive. Those options are then displayed to the user in GUI format. However, when some value referenced by the ng-model directive doesn’t exist in the list transferred to the ng-option, then an empty option gets created in the GUI list, which can be seen above example. The easiest way to correct this error is to reference a valid value from the ng-option list. The value referenced must be available on the list. We can reference a valid value using the below code. Here, i will be the index of the value that we want to reference. 

$scope.form = {type : $scope.allNames[i].val}; 

Just add this code below the list to remove the empty option from the select. In the example given below, we are modifying the above example, in such a way that the empty option gets removed from the drop-down. We will set the value of i to 1. After doing this, the empty option will disappear and the default selected value will be set to C++. 

Example 2: This example illustrates removing the empty option by selecting an initial value in the controller in AngularJS.

HTML




<!DOCTYPE html>
<html>
  
<head>
    <script src=
            integrity=
"sha256-ZYJ4XH6kZrqD1MlZWZZmQj6MBe/TvysMc33LPchVuo8=" 
            crossorigin="anonymous">
    </script>
</head>
  
<body>
    <h1 style="color:green;">
        GeeksforGeeks
    </h1>
    <h3>
        Dropdown of Programming Languages
    </h3>
    <div ng-App="myApp"
         ng-controller="MyCtrl">
        <select ng-model='form.type' 
             ng-options='name.val as name.label for name in allNames'>
        </select>
    </div>
    <p>Empty option gets removed</p>
    <script>
        var myApp = angular.module('myApp', []);
      
        function MyCtrl($scope) {
            $scope.allNames = [{
                label: 'C',
                val: 'C Language'
            }, {
                label: 'C++',
                val: 'C++ Language'
            }, {
                label: 'Java',
                val: 'Java Language'
            }, {
                label: 'Python',
                val: 'Python Language'
            }, {
                label: 'JavaScript',
                val: 'JavaScript Language'
            }];
            $scope.form = {
                type: $scope.allNames[1].val
            };
        }
    </script>
</body>
</html>

Output:

 


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