first commit

script.js

@@ -0,0 +1,34 @@
+function validateTAJ(taj) {
+  taj = taj.replace(/[^0-9]/g, '');
+
+  if (taj.length != 9) {
+    return false;
+  }
+
+  let sum = 0;
+  let num = '';
+
+  for (let i = 0; i < taj.length; i++) {
+    if (i < 8) {
+      sum += i % 2 == 0 ? parseInt(taj[i]) * 7 : parseInt(taj[i]) * 3;
+      num += taj[i];
+    }
+  }
+
+  num += sum % 10;
+  return taj == num;
+}
+
+function checkTAJ() {
+  const tajInput = document.querySelector('#taj');
+  const resultElement = document.querySelector('#result');
+  const taj = tajInput.value;
+
+  if (validateTAJ(taj)) {
+    resultElement.textContent = 'A TAJ szám érvényes.';
+    resultElement.style.color = '#4CAF50';
+  } else {
+    resultElement.textContent = 'A TAJ szám érvénytelen.';
+    resultElement.style.color = '#FF5733';
+  }
+}