searchbar2.html

<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <title>RAAR</title>
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
  
  
      <link rel="stylesheet" href="./style2.css">

  
</head>

<body>

  <h1>SEARCH FOR STUDENT</h1>
        <div class="searchBox">

            <input class="searchInput"type="text" id="search" name="" placeholder="Search">
            <button class="searchButton" onclick="search()" href="#">
                <i class="material-icons">
                    search
                </i>
            </button>
        </div>

        <script>
          function search(){
            var input = document.getElementById("search").value ;
            if(input=="21BCS8637" || input=="Rudra Sharma"){
                window.location.assign("index.html") ;
                alert("Looks good") ;
            }
            else{
                alert("INVALID INFORMATION!!") ;
                return ;
            }
        }
        </script>
</body>

</html>