ruby-on-rails - Rails 选择标记选定值

Question

我的标签：

<%= select_tag(:option, options_for_select([['All', 1], ['Co', 2], ['Bought', 3], ['View', 4], ['Top API', 5], :selected => :option ])) %>

如何将选定的值设置为选择的选项。例如，如果我选择['Bought', 3]并提交，['All', 1]则选择了选项。提交表单后如何显示选定的值。

Answer 1

您做对了一切，只需关闭以下选项]之前的选项:selected => :option：

而不是...], selected: :option ])), 改为...]], selected: :option ))

所以，你的代码应该是：

<%= select_tag(:option, options_for_select([['All', 1], ['Co', 2], ['Bought', 3], ['View', 4], ['Top API', 5]], selected: :option )) %>

Answer 2

尝试这个：

<%= select_tag(:option, options_for_select([['All', 1], ['Co', 2], ['Bought', 3], ['View', 4], ['Top API', 5]], :selected => params[:option])) %>

这在 rails 4.2 中完美运行

Answer 3

如果您想向标签添加一个类：

<%= select_tag(:option, options_for_select([["Option 1",1],["Option 2",2],["Option 3",3]], params[:option] ), class:"select") %>

5.在轨道上工作。