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document.getElementById('userForm').addEventListener('submit', function(event) { var form = event.target; var errorContainer = document.getElementById('error_message'); var hasError = false; // Verificar campos obligatorios var requiredFields = form.querySelectorAll('[required]'); for (var i = 0; i < requiredFields.length; i++) { if (!requiredFields[i].value.trim()) { hasError = true; break; } } // Mostrar mensaje de error si es necesario if (hasError) { errorContainer.style.display = 'block'; event.preventDefault(); // Detener el envío del formulario } else { errorContainer.style.display = 'none'; } });