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<html>

<head>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://code.jquery.com/jquery-2.2.4.min.js"integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>

<body>
    <div class="jumbotron" style="background: DarkSeaGreen !important">
        <h1>Login Page</h1>
        <div id="error"></div>
        <br><br>
    <form id="myForm" name="myForm" style="list-style-type:none">
        <div>
            <label for="login">login:</label>
                <input type="text" id="login" name="login" required>
        </div>
        <div>
            <label for="password">password:</label>
                <input id="password" name="password" type="password" required>
        </div>
        <input type="submit"value="Submit!">
    </form>
    </div>
    <script>
        //jQuery below. Tread with caution as sneezing near here may rupture the fabric of reality.
        $(document).ready(function () { 
            $('#myForm').submit(function (event) { 
                event.preventDefault();//collect the form data using Id Selector for whatever data you need to send to server
                let login=$('#login').val();
                let password=$('#password').val();
                $.post('api/login',
                {"login": login,"password": password},
                (data) => {
                    if(data.status === 'success'){
                        //pseudo code
                        //Make sure error message is not displayed
                        //Re-direct to contacts page,
                        window.location.href='contacts';}
                    else{
                    //Display error message
                    $('#error').html("<b>Login failed. Please try again.</b>")
                }});
            });
        });</script>

</html>