ruby-on-rails - 在 simpleform + Rails 中的 bootstrap 中左对齐 "remember me"复选框

Question

我希望“记住我”复选框像普通复选框一样向左对齐。

但目前，由于 .form-control 类，它非常宽且居中。

Bootstrap docs表明输出的html需要是

<form role="form">
  ...
  <div class="checkbox">
    <label>
      <input type="checkbox"> Check me out
    </label>
  </div>
  ...
</form>

但是输出是

我调整了我的 simpleform 初始值设定项，但我不确定需要进一步调整哪一个来获得所需的行为。

输出html

<form id="new_user" class="simple_form new_user" novalidate="novalidate" method="post" action="/login" accept-charset="UTF-8">

<div class="form-group boolean optional user_remember_me">
    <label class="boolean optional control-label" for="user_remember_me">

        Remember me

    </label>
    <input type="hidden" value="0" name="user[remember_me]"></input>
    <label class="">
        <input id="user_remember_me" class="boolean optional" type="checkbox" value="1" name="user[remember_me]"></input>
    </label>
    <div class="controls"></div>
</div>

以下是实际文件:

设计new.html.slim

h2 Sign in
= simple_form_for(resource, as: resource_name, url: session_path(resource_name)) do |f|
  .form-inputs
    = f.input :remember_me, as: :boolean if devise_mapping.rememberable?
  .form-actions
    = f.button :submit, "Sign in"
= render "devise/shared/links"

simple_form.rb

# 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 the native HTML5 validations (novalidate form option).
  # These validations are enabled in SimpleForm's internal config but disabled by default
  # in this configuration, which is recommended due to some quirks from different browsers.
  # To stop SimpleForm from generating the novalidate option, enabling the HTML5 validations,
  # change this configuration to true.
  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

  # 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?

  # Default class for inputs
  # config.input_class = nil

#

  # Default class for inputs
  config.input_class = 'form-control'
end

simple_form.bootstrap.rb

# Use this setup block to configure all options available in SimpleForm.
SimpleForm.setup do |config|
  config.wrappers :bootstrap, tag: 'div', class: 'form-group', error_class: 'error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.wrapper tag: 'div', class: 'controls' do |ba|
      ba.use :input
      ba.use :error, wrap_with: { tag: 'span', class: 'help-inline' }
      ba.use :hint,  wrap_with: { tag: 'p', class: 'help-block' }
    end
  end


  # Wrappers for forms and inputs using the Twitter Bootstrap toolkit.
  # Check the Bootstrap docs (http://twitter.github.com/bootstrap)
  # to learn about the different styles for forms and inputs,
  # buttons and other elements.
  config.default_wrapper = :bootstrap
end

更新:

已将 simple_form gem 版本更新为 3.1.0.rc1，如已接受的答案所指出的。运行rails g simple_form:install和rails g simple_Form:install --bootstrap`后，新的配置初始值设定项文件将被更新。我的 html 输出要好得多，但复选框的小细节是垂直的，而不是内联的。输出如下:

<div class="form-group boolean optional user_remember_me">

    <label class="boolean optional control-label" for="user_remember_me">

        Remember me

    </label>
    <div>
        <input type="hidden" value="0" name="user[remember_me]"></input>
        <label>
            <input id="user_remember_me" class="boolean optional" type="checkbox" value="1" name="user[remember_me]"></input>
        </label>
    </div>

</div>

Answer 1

直到 simple_form 3.1.0.rc1 为止，simple_form 不支持 bootstrap 3 标记。因此生成的 HTML 包含混合的 bootstrap 2 和 3 类。 Bootstrap 3 的正确标记应如下所示

<div class='form-group'>
    <div class="boolean input optional checkbox" id="user_remember_me_input">
        <input name="user[remember_me]" type="hidden" value="0" />
        <label class=" control-label" for="user_remember_me">
            <input id="user_remember_me" name="user[remember_me]" type="checkbox" value="1" />
            Remember me
        </label>
    </div>
</div>