Build a Roman Numeral Converter Project - Build a Roman Numeral Converter

JavaScript
1

Tell us what’s happening:

how do I get the results to show on the output div?

Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
    <link
      href="https://fonts.googleapis.com/css2?family=Castoro+Titling&display=swap"
      rel="stylesheet"
    />
    <link rel="stylesheet" type="text/css" href="styles.css" />
    <title>Roman Numeral Converter</title>
  </head>
  <body>
    <main>
      <h1>Roman Numeral Converter</h1>
      <form id="form" class="form">
        <fieldset>
          <label for="number">Enter a Number:</label><br />
          <input type="number" id="number" required />
          <button type="button" id="convert-btn">Convert</button>
        </fieldset>
      </form>
      <div id="output" class="output hidden"></div>
    </main>
    <script src="script.js"></script>
  </body>
</html>


/* file: styles.css */
:root {
  --gray-00: #ffffff;
  --gray-05: #f5f6f7;
  --gray-15: #d0d0d5;
  --gray-75: #3b3b4f;
  --gray-85: #1b1b32;
  --gray-90: #0a0a23;
  --blue-50: #198eee;
  --error: #a94442;
  --danger-color: #850000;
  --danger-background: #ffadad;
}

*,
::before,
::after {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  padding: 50px 20px;
  font-family: 'Lato', Helvetica, Arial, sans-serif;
  font-size: 18px;
  background-color: var(--gray-85);
  color: var(--gray-05);
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

h1 {
  text-align: center;
  margin: 20px auto;
  max-width: 350px;
  font-family: 'Castoro Titling', cursive;
}

form {
  color: var(--gray-05);
  margin: auto 25px;
  padding: 15px auto;
  border: 3px solid var(--gray-05);
  text-align: center;
  width: 90%;
  max-width: 500px;
  background-color: var(--gray-75);
}

fieldset {
  border: 0 none;
  height: 100%;
  padding: 25px;
  margin: 10px 20px;
}

label {
  display: inline-block;
  font-size: 1.5rem;
  margin-bottom: 10px;
  font-weight: bold;
}

input:focus-visible,
button:focus-visible {
  outline: 3px solid var(--blue-50);
}

input {
  display: block;
  font-size: 2.5rem;
  width: 100%;
  height: 60px;
  padding: 6px 12px;
  margin: 10px 0;
  line-height: 1.4;
  color: white;
  background-color: var(--gray-90);
  border: 1px solid var(--gray-05);
}

button {
  cursor: pointer;
  margin-top: 15px;
  text-decoration: none;
  background-image: linear-gradient(#fecc4c, #ffac33);
  border: 3px solid #feac32;
  padding: 10px 16px;
  font-size: 23px;
  width: 100%;
}

.output {
  color: white;
  background-color: var(--gray-75);
  border: 3px solid var(--gray-05);
  font-size: 2.5rem;
  width: 90%;
  max-width: 500px;
  min-height: 55px;
  margin-top: 25px;
  padding: 15px;
  overflow-wrap: break-word;
  text-align: center;
}

.alert {
  font-size: 2rem;
  background-color: var(--danger-background);
  border: 3px solid var(--danger-color);
  color: var(--danger-color);
}

.hidden {
  display: none;
}


/* file: script.js */
const button = document.getElementById("convert-btn");
const numberInput = document.getElementById("number");
const outputDiv = document.getElementById("output");

function checkForValue() {
    const num = numberInput.value
    if (num === "") {
        outputDiv.textContent = "Please enter a valid number";
    } else if (num < 1) {
        outputDiv.textContent = "Please enter a number greater than or equal to 1";
    } else if (num >= 4000) {
        outputDiv.textContent = "Please enter a number less than or equal to 3999";
    } else {
        outputDiv.textContent = toRomanNumber(num);
    }
};

function toRomanNumber(num) {
    const romanNumerals = [
        { value: 1000, numeral: 'M' },
        { value: 900, numeral: 'CM' },
        { value: 500, numeral: 'D' },
        { value: 400, numeral: 'CD' },
        { value: 100, numeral: 'C' },
        { value: 90, numeral: 'XC' },
        { value: 50, numeral: 'L' },
        { value: 40, numeral: 'XL' },
        { value: 10, numeral: 'X' },
        { value: 9, numeral: 'IX' },
        { value: 5, numeral: 'V' },
        { value: 4, numeral: 'IV' },
        { value: 1, numeral: 'I' }
      ];

    let roman = '';
    for (let i = 0; i < romanNumerals.length; i++) {
        while (num >= romanNumerals[i].value) {
            roman += romanNumerals[i].numeral;
            num -= romanNumerals[i].value;
        }
    }
    return roman;
}

button.addEventListener("click", checkForValue);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Challenge Information:

Build a Roman Numeral Converter Project - Build a Roman Numeral Converter

2

for the div to appear it should not have the hidden class
image

3

Thankyou!, but how do i make the appear only after a user has entered a value?

4

you need to use JavaScript to remove the class

5

Got it, thanks again ^^

6

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