toDoList.html

<!doctype html>
<html lang="en">

<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
    <title>Saroj's ToDoList</title>
</head>

<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
        <a class="navbar-brand" href="#">Saroj's ToDo Lists</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
    </nav>
    <div class='container my-4'>
        <h2 class="text-center">ToDos Lists</h2>
        <div class="form-group">
            <label for="title">Title</label>
            <input type="text" class="form-control" id="title" aria-describedby="emailHelp">
        </div>
        <div class="form-group">
            <label for="description">Description</label>
            <textarea class="form-control" id="description" rows="3"></textarea>
        </div>
        <button type="submit" id="add" class="btn btn-primary">Add to List</button>
        <button type="submit" id="clear" class="btn btn-primary" onclick="cleared()">Clear List</button>
        <div id="items" class="my-4">
            <h2>Your Items are</h2>
            <table class="table">
                <thead>
                    <tr>
                        <th scope="col">Sl. No.</th>
                        <th scope="col">Title</th>
                        <th scope="col">Description</th>
                        <th scope="col">Action</th>
                    </tr>
                </thead>
                <tbody id="tableId">
                </tbody>
            </table>
        </div>
    </div>
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>
    <script>
    function getAndUpdate() {
        console.log("updating");
        tit = document.getElementById("title").value;
        desc = document.getElementById("description").value;
        if (localStorage.getItem('itemsJson') == null) {
            itemJsonArray = [];
            itemJsonArray.push([tit, desc]);
            localStorage.setItem('itemsJson', JSON.stringify(itemJsonArray));
        } else {
            itemJsonArray = JSON.parse(localStorage.getItem('itemsJson'));
            itemJsonArray.push([tit, desc]);
            localStorage.setItem('itemsJson', JSON.stringify(itemJsonArray));
        }
        update();
    }

    function update() {
        if (localStorage.getItem('itemsJson') == null) {
            itemJsonArray = [];
            localStorage.setItem('itemsJson', JSON.stringify(itemJsonArray));
        } else {
            itemJsonArray = JSON.parse(localStorage.getItem('itemsJson'));
        }
        let tableId = document.getElementById('tableId');
        let str = "";
        itemJsonArray.forEach((element, index) => {
            str += `<tr>
                        <th scope="row">${index + 1}</th>
                        <td>${element[0]}</td>
                        <td>${element[1]}</td>
                        <td><button class="btn btn-sm btn-primary" onclick="deleted(${index})">Delete</button></td>
                    </tr>`;
        });
        tableId.innerHTML = str;
    }
    add = document.getElementById("add");
    add.addEventListener("click", getAndUpdate);
    update();

    function deleted(itemIndex) {
        console.log("Delete", itemIndex);
        itemJsonArrayStr = localStorage.getItem('itemsJson');
        itemJsonArray = JSON.parse(itemJsonArrayStr);
        itemJsonArray.splice(itemIndex, 1);
        localStorage.setItem('itemsJson', JSON.stringify(itemJsonArray));
        update();
    }

    function cleared() {
        if (confirm("Do you really want to clear?")) {
            localStorage.clear();
            update();
        }
    }
    </script>
</body>

</html>