Rails 3：“redirect_to”在 Ajax 调用后无法正常工作

Question

In my Rails 3 application user adds a new message to forum using Ajax:

<%= form_tag("/forum/add_new_message", :remote => true) do %>
  <%= text_area_tag("new_message_area") %>
<% end %>

Here is my controller's code:

def index
  @messages = Message.all
end

def add_new_message
  Message.create(:text => params[:new_message_area], ...)                 
  redirect_to(:action => 'index')
end

The problem is that after user adds a new message, redirect_to(:action => 'index') executed, but the page is not refreshed, ie I don't see the new message.

Why?

Answer 1

The web browser is expecting some javascript to be executed after the ajax has been called. Your code should work when javascript is disabled in the browser.

In the add_new_message method you should add:

respond_to do |format|
  format.html { redirect_to(:action => 'index') }
  format.js
end

Then some javascript in add_new_message.js.erb will be executed, so to redirect to the index, the code in add_new_message.js.erb should look like:

window.location = '<%= forums_path %>'; //or whatever other path

Although both the HTML and javascript do the same thing. Why is the ajax needed in the first place?

Answer 2

I'd be tempted to go for something like this in the controller:

def index
  @messages = Message.all
end

def add_new_message
  Message.create(:text => params[:new_message_area], ...)                 
  render js: %(window.location.pathname='#{messages_path}')
end