Coffeescript下拉值

Question

我試圖顯示省/州字段，如果國家下拉等於「加拿大」或「美國」通過Coffeescript。

到目前爲止，我有（但看起來反覆復）

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

的以下作品：

$('#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() 

然而，根據http://api.jquery.com/selected-selector/，事情就會有更好的表現與

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