如何在simple_form中使用占位符而不是标签？

I want to use placeholders everywhere in my application instead of labels. I am using simple_form and Rails (3.2.14). How can I specify in simple_form config file to use placeholders instead of labels.

我想在我的应用程序中使用占位符而不是标签。我使用的是simple_form和Rails（3.2.14）。如何在simple_form配置文件中指定使用占位符而不是标签。

In Initializers there is a file simple_form.rb ie

在Initializers中有一个文件simple_form.rb即

# Use this setup block to configure all options available in SimpleForm.
SimpleForm.setup do |config|
  # Wrappers are used by the form builder to generate a
  # complete input. You can remove any component from the
  # wrapper, change the order or even add your own to the
  # stack. The options given below are used to wrap the
  # whole input.
  config.wrappers :default, :class => :input, :hint_class => :field_with_hint, :error_class => :field_with_errors do |b|
    ## Extensions enabled by default
    # Any of these extensions can be disabled for a
    # given input by passing: `f.input EXTENSION_NAME => false`.
    # You can make any of these extensions optional by
    # renaming `b.use` to `b.optional`.

    # Determines whether to use HTML5 (:email, :url, ...)
    # and required attributes
    b.use :html5

    # Calculates placeholders automatically from I18n
    # You can also pass a string as f.input :placeholder => "Placeholder"
    b.use :placeholder

    ## Optional extensions
    # They are disabled unless you pass `f.input EXTENSION_NAME => :lookup`
    # to the input. If so, they will retrieve the values from the model
    # if any exists. If you want to enable the lookup for any of those
    # extensions by default, you can change `b.optional` to `b.use`.

    # Calculates maxlength from length validations for string inputs
    b.optional :maxlength

    # Calculates pattern from format validations for string inputs
    b.optional :pattern

    # Calculates min and max from length validations for numeric inputs
    b.optional :min_max

    # Calculates readonly automatically from readonly attributes
    b.optional :readonly

    ## Inputs
    b.use :label_input
    b.use :hint,  :wrap_with => { :tag => :span, :class => :hint }
    b.use :error, :wrap_with => { :tag => :span, :class => :error }
  end

  # The default wrapper to be used by the FormBuilder.
  config.default_wrapper = :default

  # Define the way to render check boxes / radio buttons with labels.
  # Defaults to :nested for bootstrap config.
  #   :inline => input + label
  #   :nested => label > input
  config.boolean_style = :nested

  # Default class for buttons
  config.button_class = 'btn'

  # Method used to tidy up errors. Specify any Rails Array method.
  # :first lists the first message for each field.
  # Use :to_sentence to list all errors for each field.
  # config.error_method = :first

  # Default tag used for error notification helper.
  config.error_notification_tag = :div

  # CSS class to add for error notification helper.
  config.error_notification_class = 'alert alert-error'

  # ID to add for error notification helper.
  # config.error_notification_id = nil

  # Series of attempts to detect a default label method for collection.
  # config.collection_label_methods = [ :to_label, :name, :title, :to_s ]

  # Series of attempts to detect a default value method for collection.
  # config.collection_value_methods = [ :id, :to_s ]

  # You can wrap a collection of radio/check boxes in a pre-defined tag, defaulting to none.
  # config.collection_wrapper_tag = nil

  # You can define the class to use on all collection wrappers. Defaulting to none.
  # config.collection_wrapper_class = nil

  # You can wrap each item in a collection of radio/check boxes with a tag,
  # defaulting to :span. Please note that when using :boolean_style = :nested,
  # SimpleForm will force this option to be a label.
  # config.item_wrapper_tag = :span

  # You can define a class to use in all item wrappers. Defaulting to none.
  # config.item_wrapper_class = nil

  # How the label text should be generated altogether with the required text.
  # config.label_text = lambda { |label, required| "#{required} #{label}" }

  # You can define the class to use on all labels. Default is nil.
  config.label_class = 'control-label'

  # You can define the class to use on all forms. Default is simple_form.
  # config.form_class = :simple_form

  # You can define which elements should obtain additional classes
  # config.generate_additional_classes_for = [:wrapper, :label, :input]

  # Whether attributes are required by default (or not). Default is true.
  # config.required_by_default = true

  # Tell browsers whether to use default HTML5 validations (novalidate option).
  # Default is enabled.
  config.browser_validations = false

  # Collection of methods to detect if a file type was given.
  # config.file_methods = [ :mounted_as, :file?, :public_filename ]

  # Custom mappings for input types. This should be a hash containing a regexp
  # to match as key, and the input type that will be used when the field name
  # matches the regexp as value.
  # config.input_mappings = { /count/ => :integer }

  # Custom wrappers for input types. This should be a hash containing an input
  # type as key and the wrapper that will be used for all inputs with specified type.
  # config.wrapper_mappings = { :string => :prepend }

  # Default priority for time_zone inputs.
  # config.time_zone_priority = nil

  # Default priority for country inputs.
  # config.country_priority = nil

  # Default size for text inputs.
  # config.default_input_size = 50

  # When false, do not use translations for labels.
  # config.translate_labels = true

  # Automatically discover new inputs in Rails' autoload path.
  # config.inputs_discovery = true

  # Cache SimpleForm inputs discovery
  # config.cache_discovery = !Rails.env.development?
end

4 个解决方案

#1

You need 3 steps to enable showing placeholders instead of labels automatically and need to do more configurations.

您需要3个步骤才能自动显示占位符而不是标签，并且需要执行更多配置。

1. make sure b.use :placeholder in simple_form.rb

   确保b.use：占位符在simple_form.rb中

2. make sure b.use :input instead of b.use :label_input

   确保b.use：输入而不是b.use：label_input

3. most important, modify your simple_form.en.yml:

   最重要的是，修改你的simple_form.en.yml：

en:
simple_form:
"yes": 'Yes'
"no": 'No'
required:
text: 'required'
mark: '*'
placeholders:
user:
name: 'name'

in your page:

在您的页面中：

<%= simple_form_for @user do |f|%>
  <%= f.input :name%>
<% end%>

Every placeholder needs to be defined here, or it will not display.

每个占位符都需要在此处定义，否则将无法显示。

#2

simple_form lets you hide an individual label by passing in label:false to each input. For example: <%= f.input :email, placeholder: 'Email', label:false %> will hide the label for your email input in a form.

simple_form允许您通过将label：false传递给每个输入来隐藏单个标签。例如：<％= f.input：email，占位符：'Email'，label：false％>将隐藏表单中电子邮件输入的标签。

#3

You just alter, at initializers/simple_form.rb:

您只需在initializers / simple_form.rb中更改：

## Inputs
b.use :label_input

to

至

## Inputs
b.use :input

and, at your views just use attribute :placeholder instead of :label

并且，在您的视图中，只需使用attribute：placeholder而不是：label

#4

Solution for bootstrap-enabled forms

In order to get this to work with Bootstrap I had to update simple_form_bootstrap.rb and comment out the b.use :label entries in the config for both vertical_form and horizontal_form:

为了使这与Bootstrap一起使用，我必须更新simple_form_bootstrap.rb并注释掉配置中的b.use：label条目，包括vertical_form和horizo​​ntal_form：

#b.use :label, class: 'control-label'
b.use :placeholder

Then as @Bigxiang correctly mentioned the placeholders then all need to have a value defined in your simple_form.{LANG}.yml.

然后，当@Bigxiang正确提到占位符时，所有人都需要在simple_form中定义一个值。{LANG} .yml。

en:
  placeholders:
    defaults:
      first_name: First name
      last_name: Last name
    user:
      email: Email

Note that you don't have to specify the model when you use generic defaults translations, like first_name, last_name in my example.

请注意，在使用通用默认值转换时，您不必指定模型，例如我的示例中的first_name，last_name。