Remove first option from a selectbox
by dcardoso
HTML
<select>
<option data-placeholder="true">Seleccionar Conta</option>
<option>123</option>
<option>456</option>
</select>
JavaScript
$('select').change(function () {
if ($("select option:selected").attr('data-placeholder') != 'true' && $("select option:first").attr('data-placeholder') == 'true') {
$(this).children(':first').hide();
}
});