Palindrome Checker

Javascript

Palindrome Checker

HiroDaegu 2022. 11. 16. 15:37

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<html lang="ko">
<head>
    <title>Palindrome Checker</title>
    <!--Google Font-->
    <link rel="preconnect" href="https://fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500&display=swap" rel="stylesheet">
    <!--Stylesheet-->
    <link rel="stylesheet" href="style.css">
    <script defer src="main.js"></script>
</head>
<body>
    <div class="container">
        <input type="text" id="input-text" placeholder="Enter a word to check">
        <button id="btn">Check</button>
        <p id="result"></p>
    </div>
</body>
</html>

*,
*:before,
*:after{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    background-color: #b156fe;
}
.container{
    width: 35%;
    min-width: 450px;
    background-color: #ffffff;
    padding: 50px 30px;
    position: absolute;
    transform: translate(-50%,-50%);
    left: 50%;
    top: 50%;
    border-radius: 8px;
    box-shadow: 0 20px 25px rgba(0,0,0,0.18);
}
.container *{
    font-family: "DM Sans", sans-serif;
    outline: none;
    font-size: 16px;
}
input{
    width: 60%;
    border: none;
    border-bottom: 2px solid #d5d5d5;
    padding: 10px 5px;
    font-weight: 400;
}
input:focus{
    border-bottom: 2px solid #b156fe;
}
button{
    width: 25%;
    float: right;
    padding: 10px 20px;
    background-color: #b156fe;
    border: none;
    border-radius: 3px;
    color: #ffffff;
    font-weight: 400;
}
p{
    margin-top: 30px;
    text-align: center;
    color: #b156fe;
    font-weight: 500;
}

document.getElementById("btn").addEventListener("click", function () {
  let txt = document.getElementById("input-text").value;
  checkPalindrome(txt);
});

function checkPalindrome(txt) {
  let txt_new = txt.replace(/[^a-zA-Z0-9]/g, "").toLowerCase();
  let len = txt_new.length;
  let halfLen = Math.floor(len / 2);
  let result = document.getElementById("result");
  let i;

  for (i = 0; i < halfLen; i++) {
    if (txt_new[i] !== txt_new[len - 1 - i]) {
      result.textContent = "Nope! Not a palindrome";
      return;
    }
    result.textContent = "Yes! It's a palindrome";
  }
}

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