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AngularJS ng-required Directive

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  • Last Updated : 01 Aug, 2022
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The ng-required Directive in AngularJS is used to specify the required attribute of an HTML element. The input field in the form is required only if the expression inside the ng-required directive returns true. It is supported by <input>, <select> and <textarea> tags. 

Syntax:

<element ng-required="expression"> 
    Contents... 
</element> 

Example 1: This example uses the ng-required Directive to set the input text field of the form tag to required. 

HTML




<!DOCTYPE html>
<html>
  
<head>
    <title>ng-required Directive</title>
    <script src=
    </script>
  
    <style>
        .req {
            font-size: 90%;
            font-style: italic;
            color: red;
        }
    </style>
</head>
  
<body style="text-align:center">
    <h1 style="color:green;">
          GeeksforGeeks
      </h1>
      
      <h3>ng-required Directive</h3>
      
      <div ng-app="app" ng-controller="myCtrl">
        <form name="myForm">
            <p>Enter Your Name: <br />
                <span>
                    <input type="text" 
                           name="gfg" 
                           ng-model="Name" 
                           ng-required="true" />
                </span>
            </p>
            <span ng-show="myForm.gfg.$invalid" class="req">
                This is the required field.
            </span>
        </form>
    </div>
  
    <script>
        var app = angular.module("app", []);
        app.controller("myCtrl", function ($scope) {
            $scope.Name = "";
        });
    </script>
</body>
</html>

Output:

 

 Example 2: This example uses the ng-required Directive to create the required field after checking the checkbox. 

HTML




<!DOCTYPE html>
<html>
  
<head>
    <title>ng-required Directive</title>
  
    <script src=
    </script>
</head>
  
<body ng-app="app" style="text-align:center">
    <h1 style="color:green">
          GeeksforGeeks
      </h1>
    
    <h2>ng-required Directive</h2>
    
    <div ng-controller="geek" style="font-family:arial;">
        <form name="myform">
            <label for="requiredValue">
                Is Required:
            </label>
            <input type="checkbox" 
                   ng-model="requiredValue" 
                   id="required" />
            <br><br>
            <label for="input">Enter Name: </label>
            <input type="text" 
                   ng-model="model" 
                   id="input" 
                   name="input" 
                   ng-required="requiredValue" />
            <br>
            <p style="color:red;" 
                   ng-show='myform.input.$error.required'>
                Name is required
            </p>
        </form>
    </div>
  
    <script>
        var app = angular.module('app', [])
        app.controller('geek', ['$scope', function ($scope) {
            $scope.requiredValue = true;
        }]);
    </script>
</body>
</html>

Output:

 


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