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<form id="meyveForm" action="#" method="post"> <p>En az bir meyve seçiniz:</p> <input type="checkbox" id="elma" name="meyveler[]" value="elma"> <label for="elma">Elma</label><br> <input type="checkbox" id="armut" name="meyveler[]" value="armut"> <label for="armut">Armut</label><br> <input type="checkbox" id="çilek" name="meyveler[]" value="çilek"> <label for="çilek">Çilek</label><br><br> <input type="submit" value="Gönder"> </form> <script> document.getElementById("meyveForm").addEventListener("submit", function(event) { var checkboxes = document.querySelectorAll('input[type="checkbox"]:checked'); if (checkboxes.length < 1) { alert("En az bir meyve seçmelisiniz."); event.preventDefault(); } }); </script>
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