Question

我正在尝试在Rails应用程序的表单元素下方内联显示错误消息。

我做了以下事情。

控制器

def create
    @faculty = Faculty.new(faculty_params)
    respond_to do |format|
        if @faculty.save
            format.html { redirect_to admin_faculties_path, notice: 'Faculty was successfully created.'}
            format.json {render json: @faculty, status: :created, location: @faculty}
        else
            format.html {render '_form'}
            format.json {render json: @faculty.errors, status: :unprocessable_entity }
        end
    end
end

表格

    <% form_with(model: [:admin, @faculty]) do |f| %>
<div class="card-title">Add Faculty</div>
    <div class="form-group">
        <%= f.label :faculty_name, class: "form-label" do %>
        Faculty Name <span class="form-required">*</span>
        <% end %>
        <%= f.text_field :faculty_name, class: "form-control", placeholder: "Faculty Name", required: true %>
    </div>
<%= f.submit class: "btn btn-primary" %>

由于我在Model中有一些验证规则，因此它会检查验证，并在验证发生时阻止表单提交。因此，这是form_with表单，所有请求均由Ajax处理。因此，我希望在每个表单元素下方显示验证错误。请通过示例向我提出建议，以便我可以完成此任务。

Answer 1

您可以在表单字段中检查每个属性的errors，如果该属性有任何错误，只需显示它们

<% form_with(model: [:admin, @faculty]) do |f| %>
  <div class="card-title">Add Faculty</div>
  <div class="form-group">
    <%= f.label :faculty_name, class: "form-label" do %>
      Faculty Name <span class="form-required">*</span>
    <% end %>
    <%= f.text_field :faculty_name, class: "form-control", placeholder: "Faculty Name", required: true %>
    <% if @faculty.errors[:name].any? %>
      <ul>
        <% @faculty.errors[:name].each do |message| %>
          <li><%= message %></li>
        <% end %>
      </ul>
    <% end %>
  </div>
<%= f.submit class: "btn btn-primary" %>

一个更好的解决方案可以重构为helper：

助手

module FacultyHelper

  def inline_errors(model, model_attribute)
    result = ""
    if model.errors[model_attribute].any?
         model.errors[model_attribute].each do |message|
            result += "<li>#{message}</li>"
        end
    end
    return "<ul>#{result}</ul>".html_safe
  end
end

查看 [更新：名称错误的包装器]

<% form_with(model: [:admin, @faculty]) do |f| %>
  <div class="card-title">Add Faculty</div>
  <div class="form-group">
    <%= f.label :faculty_name, class: "form-label" do %>
      Faculty Name <span class="form-required">*</span>
    <% end %>
    <%= f.text_field :faculty_name, class: "form-control", placeholder: "Faculty Name", required: true %>
    <div id="user_name_errors">
       <%= inline_errors(@faculty, :name) %>
    </div>
  </div>
<%= f.submit class: "btn btn-primary" %>

对于远程：true，您需要在控制器上定义format.js

控制器

def create
    @faculty = Faculty.new(faculty_params)
    respond_to do |format|
        if @faculty.save
            format.html { redirect_to admin_faculties_path, notice: 'Faculty was successfully created.'}
            format.json {render json: @faculty, status: :created, location: @faculty}
            format.js
        else
            format.html {render '_form'}
            format.json {render json: @faculty.errors, status: :unprocessable_entity }
            format.js
        end
    end
end

创建相应的js.erb视图

create.js.erb

$("#user_name_errors").html("<%= inline_errors(@faculty, :name) %>");

Rails Form_with显示内联错误消息

1 个答案: