AngularJS | ng-required Directive

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 ng-required directive returns true. It is Supported by <input>, <select> and <textarea>.

Syntax:

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

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



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<!DOCTYPE html>
<html>
  
<head>
    <title>ng-required Directive</title>
      
    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js">
    </script>
  
    <style>
        .req {
            font-size: 90%;
            font-style: italic;
            color: red;
        }
    </style>
</head>
  
<body style="text-align:center">
      
    <h1 style="color:green">GeeksforGeeks</h1>
    <h2>ng-required Directive</h2>
      
    <div ng-app="app" ng-controller="myCtrl">                 
        <form name="myForm">
            <p>Enter Your Name: <br/>
                <span>
                    <input type="text" name="name"
                    ng-model="Name" ng-required ="true" />
                </span>
            </p>
              
            <span ng-show="myForm.name.$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>                    

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Output:

Before Input the name: 

ngrequired

After Input the name:

ngrequired


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











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<!DOCTYPE html> 


<html> 


  


<head> 


    <title>ng-required Directive</title> 


      


    <script src= 


"https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"> 


    </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>                     



















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Output:

Before checked the checkbox: 

ngrequired

After checked the checkbox:

ngrequired



          
          
          

          

    

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