rails 4 radio_button_tag 默认不选

Question

我正在使用 Rails 4，但无法使用 radio_button_tag 将第一个选项设置为默认值。

.field
  =radio_button_tag :type, "order", checked:"true", class: "rfi_radio"
  =label_tag :type_order, "Information pertaining to an order"
  br
  =radio_button_tag :type, "quote", class: "rfi_radio"
  =label_tag :type_quote, "Information pertaining to a quote"
  br
  =radio_button_tag :type, "customer", class: "rfi_radio"
  =label_tag :type_customer, "Information pertaining to a customer"
  br
  =radio_button_tag :type, "general", class: "rfi_radio"
  =label_tag :type_general, "General information"

Answer 1

看看doc for the radio_button_tag。

这应该有效：

.field
    =radio_button_tag :type, "order", true, class: "rfi_radio"

Answer 2

根据 http://apidock.com/rails/ActionView/Helpers/FormTagHelper/radio_button_tag，您应该只传递布尔值而不是散列值。

=radio_button_tag :type, "order", true, class: "rfi_radio"

Answer 3

Rails 将默认单选按钮设置为默认选中。在它正常工作之前，我必须将所有替代项设置为 false。

.field
  =radio_button_tag "type", "order", true,  class: "rfi_radio"
  =label_tag :type_order, "Information pertaining to an order"
  br
  =radio_button_tag "type", "quote", false, class: "rfi_radio"
  =label_tag :type_quote, "Information pertaining to a quote"
  br
  =radio_button_tag "type", "customer", false, class: "rfi_radio"
  =label_tag :type_customer, "Information pertaining to a customer"
  br
  =radio_button_tag "type", "general", false, class: "rfi_radio"
  =label_tag :type_general, "General information"

Answer 4

我刚花了一个小时弄清楚这个问题，所以想分享一下，以防对其他人有帮助：

radio_button_tag's checked parameter will show the radio button as checked no matter what it's provided as the argument (unless nil or false) since most everything else is "truthy".
我必须向 提供 checked 参数，正好是一组中的一个 单选按钮（组是那些单选按钮同名按钮）。

希望这些提示对您有所帮助！

rails 4 radio_button_tag 默认不选

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