forms - Coffeescript dropdown value

Question

I'm trying to show province/state field if country dropdown equals "Canada" or "United States" through Coffeescript.

So far I have (but looks over complex)

canada = "Canada"
usa = "United States"
$('#order_shipping_address_attributes_country').change ->
  selected = $('#order_shipping_address_attributes_country :value').text()
  $('#shipping_province').show() if selected is canada

Answer 1

以下作品：

$('#order_shipping_address_attributes_country').change ->
  selected = $('#order_shipping_address_attributes_country option').filter(':selected').text()
  if selected is "Canada" or selected is "United States"
    $('#shipping_province').show()
  else
    $('#shipping_province').hide()

Answer 2

你可以做

selected = $('#order_shipping_address_attributes_country option:selected').text()

但是，根据http://api.jquery.com/selected-selector/，事情会表现得更好

selected = $('#order_shipping_address_attributes_country option')
           .filter(':selected').text()