如何为集合字段设置占位符文本

Question

我希望占位符字段显示 "Click to select" 但默认占位符仍显示 "Select Some Options"

 <%= f.input :tag_ids, as: :select, collection: Tag.order(:name), label_method: :name, input_html: {multiple: true}, label: "Select Category:", placeholder: "Click to select", required: true %>

Answer 1

使用select的include_blank选项

select :object, :method, {:include_blank => ’-select-’}

有关详细信息，请参阅 the documentation

Answer 2

您可以使用prompt选项，查看simple-form的文档示例

f.input :age, collection: 18..60, prompt: "Select your age", selected: 21

https://github.com/plataformatec/simple_form#collections

不需要设置as: :select，select是渲染集合时的默认值。