angularjs ng-required

The ng-required is use to validate required fields with the help of

 pwd: {
         required: true
 }

The example in detail as given below The AngularJs code sample

var app = angular.module("pwdApp", []);
        app.controller('pwdCtrl', function ($scope) {
            $scope.password = {
                pwd: {
                    required: true,
                    minlength: 6,
                    maxlength: 15
                }
            }
        });

The HTML code sample

<div ng-app="pwdApp" ng-controller="pwdCtrl">
    <div>
        <h3>Use of ng-minlength and ng-maxlength in AngularJs</h3>
    </div>
    <form name="myForm">
        Password *
        <input type="password" name="myPassword" ng-model="myPassword" ng-minlength='{{password.pwd.minlength}}' ng-maxlength="{{password.pwd.maxlength}}" ng-required='password.pwd.required' />
        <span ng-show="myForm.myPassword.$dirty && myForm.myPassword.$error.required">Password is required!</span>
        <span ng-show="myForm.myPassword.$error.minlength">Input is too short!</span>
        <span ng-show="myForm.myPassword.$error.maxlength">Input is too long!</span>
    </form>
</div>

The Full live example code

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" href="style.css">
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
    <script>
        var app = angular.module("pwdApp", []);
        app.controller('pwdCtrl', function ($scope) {
            $scope.password = {
                pwd: {
                    required: true,
                    minlength: 6,
                    maxlength: 15
                }
            }
        });
    </script>
</head>
<body ng-app="pwdApp" ng-controller="pwdCtrl">
    <div>
        <h3>Use of ng-minlength and ng-maxlength in AngularJs</h3>
    </div>
    <form name="myForm">
        Password *
        <input type="password" name="myPassword" ng-model="myPassword" ng-minlength='{{password.pwd.minlength}}' ng-maxlength="{{password.pwd.maxlength}}" ng-required='password.pwd.required' />
        <span ng-show="myForm.myPassword.$dirty && myForm.myPassword.$error.required">Password is required!</span>
        <span ng-show="myForm.myPassword.$error.minlength">Input is too short!</span>
        <span ng-show="myForm.myPassword.$error.maxlength">Input is too long!</span>
    </form>
</body>
</html>

The output:

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