你如何使用Ajax请求处理Rail的flash？

我对我提出的解决方案非常满意.基本上,我有一个帮助方法重新加载内联闪存,然后我有一个after_filter,如果请求是xhr,清除闪存.有人有比这更简单的解决方案吗？

更新:上面的解决方案已在Rails 1.x中写回,不再受支持.

您还可以使用after_filter块将Flash消息存储在响应头中,并使用javascript显示它们:

class ApplicationController < ActionController::Base
after_filter :flash_to_headers

def flash_to_headers
  return unless request.xhr?
  response.headers['X-Message'] = flash[:error]  unless flash[:error].blank?
  # repeat for other flash types...

  flash.discard  # don't want the flash to appear when you reload page
end

在application.js中添加一个全局的ajax处理程序.对于jquery做这样的事情:

$(document).ajaxError(function(event, request) {
  var msg = request.getResponseHeader('X-Message');
  if (msg) alert(msg);
});

用您自己的javascript flash函数替换alert()或尝试jGrowl.

这是我的基于@emzero的版本,修改了jQuery,在Rails 3.2上进行了测试

application_controller.rb

class ApplicationController < ActionController::Base
    protect_from_forgery

    after_filter :flash_to_headers

    def flash_to_headers
        return unless request.xhr?
        response.headers['X-Message'] = flash_message
        response.headers["X-Message-Type"] = flash_type.to_s

        flash.discard # don't want the flash to appear when you reload page
    end

    private

    def flash_message
        [:error, :warning, :notice].each do |type|
            return flash[type] unless flash[type].blank?
        end
    end

    def flash_type
        [:error, :warning, :notice].each do |type|
            return type unless flash[type].blank?
        end
    end
end

的application.js

// FLASH NOTICE ANIMATION
var fade_flash = function() {
    $("#flash_notice").delay(5000).fadeOut("slow");
    $("#flash_alert").delay(5000).fadeOut("slow");
    $("#flash_error").delay(5000).fadeOut("slow");
};
fade_flash();

var show_ajax_message = function(msg, type) {
    $("#flash-message").html('
'+msg+'
');
    fade_flash();
};

$(document).ajaxComplete(function(event, request) {
    var msg = request.getResponseHeader('X-Message');
    var type = request.getResponseHeader('X-Message-Type');
    show_ajax_message(msg, type); //use whatever popup, notification or whatever plugin you want
});

layout:application.html.haml

        #flash-message
            - flash.each do |name, msg|
                = content_tag :div, msg, :id => "flash_#{name}"

这在js响应中是必需的

如果您使用的是RSJ:

page.replace_html :notice, flash[:notice]
flash.discard

如果你使用jQuery:

$("#flash_notice").html(<%=escape_javascript(flash.delete(:notice)) %>');

我是这样做的..

控制器:

respond_to do |format|
    flash.now[:notice] = @msg / 'blah blah...'
    format.html 
    format.js
  end

视图:

    <%= render :partial => 'layouts/flash' , :locals => { :flash => flash } %>
        

布局/ _flash.html.erb

<% flash.each do |name, msg| %>
            
 
                x 
                
<%= msg %>
            
<% end %>

post.js.erb

$("#notice").html("<%= escape_javascript(render :partial => 'layouts/flash' , :locals => { :flash => flash }).html_safe %>");

建立在别人之上 -

(我们将完整的flash对象作为JSON传递,使我们能够在浏览器中重建完整的flash对象.这可以用来确保在Rails生成多个flash消息的情况下显示所有flash消息.)

#application_controller.rb
class ApplicationController < ActionController::Base
  after_filter :flash_to_headers

  def flash_to_headers
    if request.xhr?
      #avoiding XSS injections via flash
      flash_json = Hash[flash.map{|k,v| [k,ERB::Util.h(v)] }].to_json
      response.headers['X-Flash-Messages'] = flash_json
      flash.discard
    end
  end
end

//application.js
$(document).ajaxComplete(function(event, request){
  var flash = $.parseJSON(request.getResponseHeader('X-Flash-Messages'));
  if(!flash) return;
  if(flash.notice) { /* code to display the 'notice' flash */ $('.flash.notice').html(flash.notice); }
  if(flash.error) { /* code to display the 'error' flash */ alert(flash.error); }
  //so forth
}

  flash.now[:notice] = 'Your message'

  <%= yield %>
  alert('<%= escape_javascript(flash.now[:notice]) %>'); 

  <%= yield %>
  <% if flash.now[:notice] %>
    $.gritter.add({
      title: '--',
      text: '<%= escape_javascript(flash.now[:notice]) %>'
    });
  <% end %>