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November 16, 2008 - (>= v2.1.0)
11 thanks

Application Helper for Fading Flash Messages

A simple helper method for showing the flash message. Includes optional fade in seconds (view needs javascript_include_tag defaults if you desire fade effect):

def show_flash_message(options={})
  html = content_tag(:div, flash.collect{ |key,msg| content_tag(:div, msg, :class => key) }, :id => 'flash-message')
  if options.key?(:fade)
    html << content_tag(:script, "setTimeout(\"new Effect.Fade('flash-message');\",#{options[:fade]*1000})", :type => 'text/javascript')

simply call in your views then using:

<%= show_flash_message(:fade => 4) %>
June 11, 2009
4 thanks

Keeping the flash object on multiple redirects

If your controllers are redirecting more than once, the flash contents will be lost. To avoid it, execute flash.keep before each redirection.

Check ActionController::Flash::FlashHash for more handy methods (discard, now, …)

March 20, 2009
2 thanks

Broadened Flash helper

Building on the below excellent example, you can create something with default options for how long it’s displayed and how long the fade is, and highlight:

def show_flash(options={})
  options = {:fade => 3, :display => 3, :highlight => true}.merge(options)
  html = content_tag(:div, flash.collect{ |key,msg| content_tag(:div, msg, :class => key, :attributes => "style = display: none;") }, :id => 'flash-message')
  html << content_tag(:script, "new Effect.Highlight('flash-message');") if options[:highlight]
  html << content_tag(:script, "$('flash-message').appear();")
  html << content_tag(:script, "setTimeout(\"$('flash-message').fade({duration: #{options[:fade]}});\", #{options[:display]*1000});")
August 5, 2014
0 thanks

Handling flash for ajax calls

This is helper method which can be easily used to handle flash for ajax calls

##call it in your js.erb
def flash_display
response = ""
flash.each do |name, msg|
	msg=msg+"<button type='button' class='close' title='hide' data- dismiss='alert'><i class='fa-times-circle-o fa pull-right'></i></button>".html_safe
  response = response + 
  content_tag(:div, msg, :id => "flash_# {name}",:class=>"alert alert-danger") do 

so in your controller,

def get_data_and_update_div
 if @user_details.nil?
   flash.now[:error]="Add your details and then submit"
   format.js { render   'shared/error_messages'}

in error_messages.js.erb

$('#flash_messages').html("<%= escape_javascript raw(flash_display) %>");

in view file

<div id="flash_messages">
  <% if flash[:error] %>
   <%= content_tag :div, flash['value'], :id =>"flash_error" %>
 <% end %>