Build a Palindrome Checker Project - Build a Palindrome Checker

JavaScript
1

Tell us what’s happening:

I tried to run the code but nothing happen. Could anyone tell me what I have missed?

Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <link ref="stylesheet" href="styles.css" />
    <title>Palindrome Checker</title>
  </head>
  <body>
    <div class="container">
      <h1 class="title">Is it a Palindrome?</h1>
      <div class="palindrome-div">
        <label for="text-input">Enter in text to check for a palindrome:</label>
        <input id="text-input" class="palindrome-input"></input>
        <button id="check-btn" class="palindrome-btn">Check</button>
        <div id="result" class="palindrome-result">
          <p class="user-input"></p>
        </div>
      </div>
      <div class="palindrome-definition-div">
        <p class="palindrome-definition">A palindrome is a word or sentence that's spelled the same way both forward and backward, ignoring punctuation, case, and spacing.</p>
      </div>
    </div>
    <script src="script.js"></script>
  </body>
<html>

/* file: script.js */
const userInput = document.getElementById('text-input');
const checkButton = document.getElementById('check-btn');
const palindromeResult = document.getElementById('result');

const checkText = (userInput) => {
  if (userInput === '') {
    alert("Please Input a value");
    return;
  } else {
    const firsthalf = userInput.substring(0, Math.floor(userInput.length / 2));
    const secondhalf = userInput.substring(ceil(userInput.length / 2), userInput.length);
    if (firsthalf === secondhalf) {
      palindromeResult.innerText = `${userInput} is a palindrome`;
    };
    if (firsthalf != secondhalf) {
      palindromeResult.innerText = `${userInput} is not a palindrome`
    };
  };
};

checkButton.addEventListener("click", () => {
  checkText(userInput.value);
  userInput.value = '';
});

/* file: styles.css */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: #4747b3;
  color: #ffffff;
}

.container {
  width: 100%;
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.title {
  text-align: center;
  padding: 15px 0;
  font-size: 3rem;
  margin-bottom: 30px;
}

.palindrome-div {
  width: min(100vw, 450px);
  min-height: 200px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  padding: 20px;
  margin: 10px 0;
  background-color: white;
}

label {
  color: #0a0a23;
  margin-bottom: 20px
}

.palindrome-btn {
  width: 100px;
  border: none;
  padding: 15px;
  border-radius: 50px;
  background-color: #a7016d;
  color: #fff;
  cursor: pointer;
}

.palindrome-input {
  height: 30px;
  width: 250px;
  text-align: center;
  font-size: 1.2rem;
  margin: 10px;
  border: none;
  border-bottom: 3px solid #a7016d;
}

.palindrome-input:focus {
  border-bottom: 3px solid #a7016d;
}

.palindrome-input::placeholder {
  text-align: center;
}

.user-input {
  font-size: 1.4rem;
  margin-top: 10px;
  text-align: center;
}

.palindrome-result {
  overflow-y: auto;
  word-wrap: break-word;
  min-height: 50px;
  color: black;
}

.palindrome-result.hidden {
  display: none;
}

.palindrome-definition-div {
  width: min(100vw, 450px);
  font-size: 1rem;
  min-height: 150px;
  background-color: #5a596f;
  margin-top: 10px;
  padding: 30px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.palindrome-definition {
  vertical-align: middle;
  text-align: center;
}

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Safari/605.1.15

Challenge Information:

Build a Palindrome Checker Project - Build a Palindrome Checker

2

Can you say a bit more about what “nothing happened” means? I’m confused

3

Welcome to the forum @markt06

Did you take a look at the console?

Happy coding

4

There is a logic error in your code, as the original string should be compared with the entire string inverted, not just half.
My tip is:

  • make a copy of the string,
  • invert the copy.
  • compare it with the original
    This will reduce the risk of errors