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JavaScript EventListeners

registration.html
<html>
    <head>
        <title>Registration</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <link href="css/mystyle.css" rel="stylesheet" >

    </head>
    <body>
        <div class="main">
            <div class="header">

            </div> 
            <div class="leftNavBar">
                <ul>
                    <li><a href="index.html">Home</a></li>
                    <li><a href="registration.html" class="active">Registration</a></li>
                    <li><a href="about.html">About us</a></li>
                    <li><a href="contact.html">Contact us</a></li>
                    <li><a href="feedback.html">Feedback</a></li>

                </ul>

            </div>
            <div class="content">
                <h1 id="regdiv">Registration</h1>
                <button id="btn">Click</button>
                <form action="some.asp" method="POST" id="form" >
                    <label for="first_name">First Name</label>
                    <input type="text" name="first_name" id="first_name" value="" placeholder="Enter First name" class="textInput">
                    <label for="user_name">Username</label>
                    <input type="text" name="user_name" id="user_name" placeholder="Enter Username" class="textInput">
                    <label for="password">Password</label>
                    <input type="password" name="password" id="password" value="" placeholder="Enter Password" class="textInput">
                    <label>Gender</label>
                    <label>Male</label>
                    <input type="radio" name="gender" id="male" value="male"  >
                    <label>Female</label>
                    <input type="radio" name="gender" id="female" value="female">
                    <label>Subscribe</label>
                    <label>SMS</label>
                    <input type="checkbox" name="sms" id="sms" onchange="smsSelected(this)">
                    <label>Email</label>
                    <input type="checkbox" name="email" id="email">
                    <label>Telephone</label>
                    <input type="checkbox" name="phone" id="phone">
                    <label for="city">City</label>
                    <select class="textInput" id="city" name="city">
                        <option value="1">Chennai</option>
                        <option value="2">Mumbai</option>
                        <option value="3">Kolkata</option>
                        <option value="4">New Delhi</option>
                    </select>
                    <label></label>
                    <input type="submit" value="Save">
                </form>
            </div>
            <div class="rightNavBar"></div>
            <div class="footer"></div>
        </div>
        <script>
            document.getElementById("regdiv").innerHTML = "Page Loaded";
            //
            var items = []; // Array
            var item = {}; // Object
            item.itemName = "Apple";
            item.itemQty = 12;
            item.itemCost = "15 INR";
            item.itemType = [];

            //console.log(item);

            items.push(item);

            item = {}; // Object
            item.itemName = "Orange";
            item.itemQty = 10;
            item.itemCost = "100 INR";

            items.push(item);

            var obj = items[1];
            console.log(obj.itemQty);

            console.log(items);

            var st = "some text";
            var n = 12;
            var b = true;
            var btn = document.getElementById("btn");
            var form = document.getElementById("form");
            var firstName = document.getElementById("first_name");
            var male = document.getElementById("male");
            btn.addEventListener("click", function (event) {
                console.log("button clicked");
            });

            form.addEventListener("submit", function (e) {
                console.log("Form Submited");
                e.preventDefault();
            });

            firstName.addEventListener("keyup", function (ev) {
                console.log(ev.target.value);
            });

            male.addEventListener("change", function (ev) {

                if (ev.target.checked) {
                    //checked 
                } else {
                    //unchecked
                }

                console.log(ev.target.value);
            });

            function smsSelected(ev) {
                //
            }

        </script>
    </body>
</html>

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