在用户注册/登录Rails + Devise时执行JS代码 [英] Execute JS code on user sign up/sign in with Rails + Devise

问题描述

我正在查看Kissmetrics（分析应用）JS API文档，并且他们有一个识别方法，让您告诉Kissmetrics有关用户。以下是他们的文档说明：

我们建议您在两种情况下呼叫识别：

当用户成功注册
当用户成功登录时，通过cookie或通过登录页面

什么是最好的方式来实现呢？如何检测用户刚刚注册或登录的时间？

解决方案

将问题分成两部分：注册并登录。

您可以检测新用户何时在您的应用程序中注册，只需在用户模型中添加一个 after_create 钩子。类似于

  class User< ActiveRecord :: Base 
 after_create：register_hook 
 
 def register_hook 
＃你的代码在这里
 end 
 end 
  

检测用户登录时有点脏。 Devise修改用户登录时的 user.current_sign_in_at 属性，因此您可以添加一个 before_save hook在用户模型中，检查 current_sign_in_at 属性是否已更改。它应该是这样的：

  class User< ActiveRecord :: Base 
 before_save：login_hook，if => current_sign_in_at_changed？ 
 
 def login_hook 
＃你的代码在这里
结束
结束
  

一旦您有正确的回调来检测登录/注册，您可以创建一个带有该信息的cookie，并从javascript中读取或为用户编写一个帮助器方法模型，并在布局中写下如下内容：

 <％if current_user.just_signed_in％> ; 
< script type =text / javascript> 
 //您在此处登录统计代码
< / script> 
<％end％> 
 
<％if current_user.just_signed_up％> 
< script type =text / javascript> 
 //你在这里注册stats代码
< / script> 
<％end％> 
  

按照这种方式，完整的模型将是：

  class User< ActiveRecord :: Base 
 after_create：register_hook 
 before_save：login_hook，if => current_sign_in_at_changed？ 
 
 attr_accessor：just_singed_up，just_signed_in 
 
 def register_hook 
 @just_signed_up = true 
 end 
 
 def login_hook 
 @just_signed_in = true 
 end 
 end 
  

I'm looking at the Kissmetrics (analytics app) JS API docs, and they have an "identify" method that lets you tell Kissmetrics about a user. Here's what their docs say:

We recommend you call identify in two scenarios:

When a user successfully signs up When a user successfully logs in, either through cookies or through a login page

What would be the best way to achieve that? How can I detect when a user has just signed up or signed in?

解决方案

Lets divide the problem in two: register and log in.

You can detect when a new user has registered in you app just adding a after_create hook in you User model. Something like

class User < ActiveRecord::Base
  after_create :register_hook

  def register_hook
    # your code here
  end
end

Detecting when the user logs in is a little bit dirtier. Devise modify the user.current_sign_in_at attribute of the user when he/she logs in, so you could add a before_save hook in the user model and check if the current_sign_in_at attribute has changed. It should be something like:

class User < ActiveRecord::Base
  before_save :login_hook, :if => current_sign_in_at_changed?

  def login_hook
    # your code here
  end
end

Once you have the right callbacks for detecting sign in/sign up, you can just create a cookie with the info and read it from the javascript or write a helper method for the User model and write something like this in your layout:

<% if current_user.just_signed_in %>
  <script type="text/javascript">
    // Your sign in stats code here
  </script>
<% end %>

<% if current_user.just_signed_up %>
  <script type="text/javascript">
    // Your sign up stats code here
  </script>
<% end %>

Following this way, the complete model would be:

class User < ActiveRecord::Base
  after_create :register_hook
  before_save :login_hook, :if => current_sign_in_at_changed?

  attr_accessor :just_singed_up, :just_signed_in

  def register_hook
    @just_signed_up = true
  end

  def login_hook
    @just_signed_in = true
  end
end

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