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| <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-sRIl4kxILFvY47J16cr9ZwB07vP4J8+LH7qKQnuqkuIAvNWLzeN8tE5YBujZqJLB" crossorigin="anonymous"> | |
| <meta charset="utf-8"> | |
| <div class="container-fluid"> | |
| <div class="row mt-5"> | |
| <div class="col"> | |
| <select class="form-control mb-2"> | |
| <option selected>IVXLCDM</option> | |
| <option>🐶🦍🫎🦄🐽🐏🐬</option> | |
| </select> | |
| <input type="number" class=form-control max="3999" min=0> | |
| <h2 class="mt-5 text-center"> | |
| <code></code> | |
| </h2> | |
| </div> | |
| </div> | |
| </div> | |
| <script> | |
| const letterSet = document.querySelector('select'); | |
| const input = document.querySelector('input'); | |
| const code = document.querySelector('code'); | |
| function calculate() { | |
| const number = parseInt(input.value); | |
| if (number > 3_999 || number < 0) { | |
| code.innerText = "☃️"; | |
| return; | |
| } | |
| const alphabet = letterSet.value; | |
| const romanNumerals = Array | |
| .from({ length: Math.ceil([...alphabet].length / 2) }) | |
| .map((_, i) => [...alphabet].slice(i*2, i*2+3)); | |
| const result = romanNumerals.map(([I, V, X], i) => { | |
| const pow = Math.pow(10, i); | |
| const digit = Math.floor(number % (pow * 10) / pow); | |
| return { | |
| 1: `${I}`, | |
| 2: `${I}${I}`, | |
| 3: `${I}${I}${I}`, | |
| 4: `${I}${V}`, | |
| 5: `${V}`, | |
| 6: `${V}${I}`, | |
| 7: `${V}${I}${I}`, | |
| 8: `${V}${I}${I}${I}`, | |
| 9: `${I}${X}`, | |
| 0: "", | |
| }[digit]; | |
| }).reverse().join(""); | |
| code.innerText = result; | |
| }; | |
| input.addEventListener('keyup', calculate); | |
| letterSet.addEventListener('change', calculate); | |
| </script> |
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