I'm just wondering why this alert method in Click Event always firing when I'm selecting my select element.

Code:
        $('#Register').click(function () {

            if ($('#account_type').val() == "def") {
                alert('Please select an account type.');
                return;
            }
        });

Code:
<select id="account_type" class="form-control login-type" onchange="AccountType()">
</select>