JQuery-validation and the Bootstrap

https://jqueryvalidation.org/files/demo/bootstrap/index.html

by Eugene Manager

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.16.0/jquery.validate.min.js"></script>
<div class="container">
    <div class="row">
        <div class="col-sm-8 col-sm-offset-2">
            <div class="page-header">
                <div class="alert alert-info" role="alert">
                    <h4>This demo shows how to integrate JQuery-validation and the Bootstrap framework.</h4>
                    <ul>
                        <li><a href="https://getbootstrap.com/" class="alert-link">Bootstrap home project</a>.</li>
                    </ul>
                </div>
            </div>
            <div class="panel panel-default">
                <div class="panel-heading">
                    <h3 class="panel-title">Simple Form</h3>
                </div>
                <div class="panel-body">
                    <form id="signupForm" method="post" class="form-horizontal" action="">
                        <div class="form-group">
                            <label class="col-sm-4 control-label" for="firstname">First name</label>
                            <div class="col-sm-5">
                                <input type="text" class="form-control" id="firstname" name="firstname" placeholder="First name" />
                            </div>
                        </div>
                        <div class="form-group">
                            <label class="col-sm-4 control-label" for="lastname">Last name</label>
                            <div class="col-sm-5">
                                <input type="text" class="form-control" id="lastname" name="lastname" placeholder="Last name" />
                            </div>
                        </div>
                        <div class="form-group">
                            <label...

JavaScript

$.validator.setDefaults( {
			submitHandler: function () {
				alert( "submitted!" );
			}
		} );

		$( document ).ready( function () {
			$( "#signupForm" ).validate( {
				rules: {
					firstname: "required",
					lastname: "required",
					username: {
						required: true,
						minlength: 2
					},
					password: {
						required: true,
						minlength: 5
					},
					confirm_password: {
						required: true,
						minlength: 5,
						equalTo: "#password"
					},
					email: {
						required: true,
						email: true
					},
					agree: "required"
				},
				messages: {
					firstname: "Please enter your firstname",
					lastname: "Please enter your lastname",
					username: {
						required: "Please enter a username",
						minlength: "Your username must consist of at least 2 characters"
					},
					password: {
						required: "Please provide a password",
						minlength: "Your password must be at least 5 characters long"
					},
					confirm_password: {
						required: "Please provide a password",
						minlength: "Your password must be at least 5 characters long",
						equalTo: "Please enter the same password as above"
					},
					email: "Please enter a valid email address",
					agree: "Please accept our policy"
				},
				errorElement: "em",
				errorPlacement: function ( error, element ) {
					// Add the `help-block` class to the error element
					error.addClass( "help-block" );

					if ( element.prop( "type" ) === "checkbox" ) {
						error.insertAfter( element.parent( "label" ) );
					} else {
						error.insertAfter( element );
					}
				},
				highlight: function ( element, errorClass, validClass ) {
					$( element ).parents( ".col-sm-5" ).addClass( "has-error" ).removeClass( "has-success" );
				},
				unhighlight: function (element, errorClass, validClass) {
					$( element ).parents( ".col-sm-5" ).addClass( "has-success" ).removeClass( "has-error" );
				}
			} );

			$( "#signupForm1" ).validate( {
				rules: {
					firstname1:...