Rails 3.2.3和json中的Flash消息

Question

There is an action in a controller. It can be called only with json format via ajax .

def update
    @article = Article.find_by_id params[:id]
    respond_to do |format|
      if @article.update_attributes(params[:article])
        flash[:message] = "good"       
      else
        flash[:error] = @article.errors.full_messages.join(", ")
      end
          format.json { render :json => flash}
  end

end

the part of a page

<% unless flash[:error].blank? %>
   <%= flash[:error] %>
<% end %>

<% unless flash[:message].blank? %>
  <%= flash[:notice] %>
<% end %>
<!-- page content goes -->

Of course, a page contains a button_to with :remote=>true that calls the method update .

The bottom line is that it shows nothing after updating. JSON object definitely returns, I can see it in fireBug.

The question is, am I using flash correctly? And how do I use it to show a message on a page? Please don't forget about ajax.

Answer 1

Why do you have an if/else statement in your respond_to block?

def update
  @article = Article.find_by_id params[:id]
  if @article.update_attributes(params[:article])
    flash[:notice] = "Good"
  else
    flash.now[:notice] = "Bad"
    render "edit"
  end
  respond_to do |format|
    format.html {redirect_to @article}
    format.js
  end
end

Then create update.js.erb

$("#notice").text("<%= escape_javascript(flash[:notice]) %>")
$("#notice").show()

Code above might not be 100% correct.

For flash, I'd have something like:

<div id="notice">
  <% flash.each do |key, value| %>
    <%= content_tag(:div, value, :class => "flash #{key}") %>
  <% end %>
</div>

Answer 2

This posting has all the code you'll need. It saved my hide:

https://gist.github.com/linjunpop/3410235

Here's a fork of it that makes a few minor modifications:

https://gist.github.com/timothythehuman/5506787

Answer 3

我认为你必须绑定ajax:success回调，它将通过替换消息或将消息发送到dom来显示flash消息。