How to avoid backspace validation in textbox

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C#

Javascript

C#4.0

Hi,
I have a textbox and done the validation in that without entering any fields I won't be able to enter the second textbox. But now the requirement is if I'm pressing backspace and entering the tab button means field level validation is not working i.e it moves to the second textbox.


The code I used

<script type="text/javascript" src="../assets/global/plugins/jquery-validation/js/jquery.validate.min.js"></script>
<script type="text/javascript" src="../assets/global/plugins/jquery-validation/js/additional-methods.min.js"></script>
<script src="../assets/admin/pages/scripts/form-wizard.js"></script>
<script type="text/javascript">
$().ready(function () {
    $('#PageContent_txt_Propertytypename').focus(function () {
        name_propertytype = document.getElementById('PageContent_txt_Propertytypename').value;
        if (name_propertytype== '') {
            $('.fld1-error').html('This field is required');
            $('#PageContent_txt_Propertytypename').css('border-color', 'red');
            document.getElementById('PageContent_txt_Propertytypename').focus();
            return false;
        } else {
            $('.fld1-error').html('');
            $('#PageContent_txt_Propertytypename').css('border-color', 'green');
        }
});
});
 
</script>

Thanks and Regards
M.G.Balamurugan