Event Listeners

 <!DOCTYPE html>

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="listners.css">
    <title>Document</title>
</head>
<body>

    <div class="container">

        <h2>Enter Your Name</h2>
        <input id="name" type="text" placeholder="Enter Name" onkeyup="register()" >
        <!-- <button class="btn" onclick="register()">Enter Button</button> -->
        <div id="data"></div>



    </div>


   

    <script src="listners.js"></script>
</body>
</html>

// java script file

function register(){
    let name=document.getElementById("name")
    let data=name.value
    let count=data.length

    if(count<=3){
        name.classList.add('input-danger')
        name.classList.remove('input-focus')
        document.getElementById('data').innerText="Enter atleast 4 characters"
       

    }
    else{
        name.classList.add('input-focus')
        name.classList.remove('input-danger')
        document.getElementById('data').innerText="Good to go"

    }



}


// CSS File

body{
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;

}

.container{
    width: 400px;
    margin: 150px auto;


}

input{

    padding: 16px 32px;
    border-radius: 10px;
    width: 100%;
    border: 1.5px solid rgb(170, 170, 170);
}
input:focus{
    outline: none;
    border-color: royalblue;




}
.btn{

    padding: 16px 32px;
    font-size: 16px;
    border-radius: 10px;
    background-color: black;
    color: white;
    border: none;
    margin-top: 20px;
}

#data{

    color: red;
    margin-top: 20px;
}

.input-focus{
    border: 1px solid green;

}

.input-danger{
    border: 1px solid red;

}

Output:-



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