如何在字段旁边显示错误消息

Question

我有一个带有输入字段/标签等的表单.如何在字段旁边显示错误消息？而不是在顶部聚集在一起？

我正在使用设计,导轨3

我把它放在表格的顶部:

 = form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f|
- if resource.errors.any?
  #errorExplanation
    %h2
      = pluralize(resource.errors.count, "error")
      prevented this user from being saved:
    %ul
      - resource.errors.full_messages.each do |msg|
        %li
          = msg

Answer 1

你可以用它

- if @resource.errors[:field_name]
  ...

也有用的链接:

http://guides.rubyonrails.org/active_record_validations.html#working-with-validation-errors

Answer 2

只需在初始化文件夹中创建一个文件即可.

配置/初始化/ inline_errors.rb

将此代码放入其中:

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
  unless html_tag =~ /^<label/
    %{<div class="has-error">#{html_tag}<span class="help-block">#{instance.error_message.first}</span></div>}.html_safe
  else
    %{#{html_tag}}.html_safe
  end
end

PD:抱歉我的英文.

Answer 3

这个怎么样

如果您想将错误消息放在文本字段下方，您可以这样做

.row.spacer20top
  .col-sm-6.form-group
    = f.label :first_name, "*Your First Name:"
    = f.text_field :first_name, :required => true, class: "form-control"
    = f.error_message_for(:first_name)

什么是error_message_for？
--> 嗯，这是一个做一些很酷的事情的漂亮技巧

# Author Shiva Bhusal
# Aug 2016
# in config/initializers/modify_rails_form_builder.rb
# This will add a new method in the `f` object available in Rails forms
class ActionView::Helpers::FormBuilder
  def error_message_for(field_name)
    if self.object.errors[field_name].present?
      model_name              = self.object.class.name.downcase
      id_of_element           = "error_#{model_name}_#{field_name}"
      target_elem_id          = "#{model_name}_#{field_name}"
      class_name              = 'signup-error alert alert-danger'
      error_declaration_class = 'has-signup-error'

      "<div id=\"#{id_of_element}\" for=\"#{target_elem_id}\" class=\"#{class_name}\">"\
      "#{self.object.errors[field_name].join(', ')}"\
      "</div>"\
      "<!-- Later JavaScript to add class to the parent element -->"\
      "<script>"\
          "document.onreadystatechange = function(){"\
            "$('##{id_of_element}').parent()"\
            ".addClass('#{error_declaration_class}');"\
          "}"\
      "</script>".html_safe
    end
  rescue
    nil
  end
end

结果

错误后生成的标记

<div id="error_user_first_name" for="user_first_name" class="signup-error alert alert-danger">This field is required.</div>
<script>document.onreadystatechange = function(){$('#error_user_first_name').parent().addClass('has-signup-error');}</script>

对应的 SCSS

  .has-signup-error{
    .signup-error{
      background: transparent;
      color: $brand-danger;
      border: none;
    }

    input, select{
      background-color: $bg-danger;
      border-color: $brand-danger;
      color: $gray-base;
      font-weight: 500;
    }

    &.checkbox{
      label{
        &:before{
          background-color: $bg-danger;
          border-color: $brand-danger;
        }
      }
    }

注意：这里使用的引导程序变量，不要忘记现在和在对配置目录中的文件进行任何修改后重新启动服务器。