rails3 simple captcha

安装：

ruby script/plugin install git://github.com/kares/simple_captcha.git

 安装之后，跟随下面的步骤配置插件：

#### STEP 1

rails generate simple_captcha

#### STEP 2

rake db:migrate

#### STEP 3
   将下面的代码添加到 config/routes.rb :
 

 Keditor::Application.routes.draw do
      match '/simple_captcha/:action', :controller => 'simple_captcha', :as => :simple_captcha
 end

 
#### STEP 4
 配置simple_captcha e.g. in `app/config/initializers/simple_captcha.rb`

前提条件是系统安装了rmagick和相关的gem 安装rmagick
 

SimpleCaptcha.backend =  :RMagick
    SimpleCaptcha.image_options = {
        :image_color => 'white',
        :image_size => '110x30',
        :text_color => 'black',
        :text_font => 'arial',
        :text_size => 22
    } # these are the defaults

 
 添加代码到app/controllers/application.rb 

ApplicationController < ActionController::Base
     include SimpleCaptcha::ControllerValidation
end

 

添加代码到model,以user为例子，注册时要求验证码

 

class User < ActiveRecord::Base
      include SimpleCaptcha::ModelValidation
      validates_captcha :on => :create, :message => 'invalid captcha'
end

 

 

singup.html.erb注册页面加入show_simple_captcha：

 

<%=form_for @user,:as=>:user, :url=>users_path, :method=>"put",:html=>{:name=>"regform",:id=>"regform"} do%>
 <li style="display:block;" class="captchadiv">
	<div class="reg_formlabel">验 证 码：</div>
	<div class="reg_element ">
	  <span class="inp_box">
	    <div class="field" id="div_simple_captcha">
<%= show_simple_captcha :object=>"user",:label=>"请输入图片中的文字",:distortion=>:high%></div>
	  </span>
	  <%if @user.errors.on(:captcha)%>
		<div style="display:block" class="reg_tips form-valid-tip-err">
			<div style="display:block;" class="error l">
			  <span class="form-valid-err-content"><%=@user.errors.on(:captcha)%></span>
			</div>
		</div>
		<%end%>
	</div>
</li>
<%end%>

 

 

默认插件不支持切换验证码，需手动添加   

 

config/routes.rb :

resources :users do 
   collection do
       get 'update_captcha'
    end
end

  users  controller:

def update_captcha
    respond_to do |format|
      format.js
    end		
end

 users view:update_captcha.rjs

page.replace_html "div_simple_captcha",show_simple_captcha(:object=>"user",:label=>"请输入图片中的文字",:distortion=>:high)

 

修改插件view的代码，加入一个链接：#{Rails.root.to_s}/vendor/plugins/simple_captcha/app/views/simple_captcha/_simple_captcha,前提要载入jquery

<div id='simple_captcha'>
  <div class='simple_captcha_image'>
    <%= @simple_captcha_options[:image] %>
  </div>
  
  <div class='simple_captcha_field'>
    <%= @simple_captcha_options[:field] %>
  </div>
  
  <div class='simple_captcha_label'>
    <%= @simple_captcha_options[:label] %>
    <a onclick="jQuery.ajax({data:'', dataType:'script', type:'post', url:'/users/update_captcha'}); return false;" href="#">换一张</a>
  </div>
</div>