King of JavaScript Online HTML Editor

<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- bootstrap 5.0.2 css for design -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

<!-- font awesome css for icons -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
</head>
<body>
<div class="container-fluid">
  <div class="container">
    <div class="mx-auto mt-5" style="max-width: 700px;">
      <div class="input-group mb-3">
        <input type="text" class="form-control" placeholder="Enter Your Name" aria-label="Recipient's username" id="username" aria-describedby="button-addon2">
        <button class="btn text-white btn-info" type="button" id="addUser">Add User</button>
      </div>
      <div class="display">
        <table class="table">
          <thead>
            <tr>
              <th scope="col">#</th>
              <th scope="col">Your Name</th>
              <th scope="col">Actions</th>
            </tr>
          </thead>
          <tbody id="records">
          </tbody>
        </table>
      </div>
    </div>
  </div>
</div>
<script>
const addUserBtn = document.getElementById('addUser');
const btnText = addUserBtn.innerText;
const usernameTextField = document.getElementById('username');
const recordsDisplay = document.getElementById('records');
let userArray = [];
let edit_id = null;

let objStr = localStorage.getItem('users');

if (objStr != null) {
   userArray = JSON.parse(objStr);
}

DisplayInfo();
addUserBtn.onclick = () => {
   //get user's name from text field
   const name = usernameTextField.value;
   if (edit_id != null) {
      //edit action
      userArray.splice(edit_id, 1, {
         'name': name
      });
      edit_id = null;
   } else {
      //insert action
      userArray.push({
         'name': name
      });
   }

   SaveInfo(userArray);
   usernameTextField.value = '';
   addUserBtn.innerText = btnText;
}

// store user's name in local storage
function SaveInfo(userArray) {
   let str = JSON.stringify(userArray);
   localStorage.setItem('users', str);
   DisplayInfo();
}

// display user's name
function DisplayInfo() {
   let statement = '';
   userArray.forEach((user, i) => {
      statement += `<tr>
           <th scope="row">${i+1}</th>
           <td>${user.name}</td>
           <td><i class="btn text-white fa fa-edit btn-info mx-2" onclick='EditInfo(${i})'></i> <i class="btn btn-danger text-white fa fa-trash" onclick='DeleteInfo(${i})'></i></td>
         </tr>`;
   });
   recordsDisplay.innerHTML = statement;
}

// edit user's name
function EditInfo(id) {
   edit_id = id;
   usernameTextField.value = userArray[id].name;
   addUserBtn.innerText = 'Save Changes';
}

//delete user's name
function DeleteInfo(id) {
   userArray.splice(id, 1);
   SaveInfo(userArray);

}
</script>
</body>
</html>