DZone Snippets: actionview code

Mask all but last 4 digits

jrm02t () — Tue, 28 Nov 2006 08:51:41 GMT

If you need to mask all but the last 4 digits of a nubmer - like a credit card number - this helper works nicely.

Just pass it a number or string.



def mask_number(number)

  number.to_s.size < 5 ? number.to_s : (('*' * number.to_s[0..-5].length) + number.to_s[-4..-1])

end

Helpers for placeholder messages

arjanvandergaag (Arjan van der Gaag) — Mon, 30 Oct 2006 20:27:58 GMT

When there are no results to display for a user you often want to tell so using a placeholder message, such as 'Sorry, no posts matched your criteria' or 'You have no recent purchases'.

I created these two helpers to make using placeholder a little bit easier.



def placeholder(message = 'Nothing to display', options = {}, &proc)

  # set default options

  o = { :class => 'placeholder', :tag => 'p' }.merge(options)



  # wrap the results of the supplied block, or

  # just print out the message

  if proc

    t = o.delete(:tag)

    concat tag(t, o, true), proc.binding

    yield

    concat "", proc.binding

  else

    content_tag o.delete(:tag), message, o

  end

end

  

def placeholder_unless(condition, *args, &proc)

  condition ? proc.call : concat(placeholder(args), proc.binding)

end

Now you can use it as follows:



<%= placeholder :message => 'Nothing found' %>



<% placeholder do %>

Nothing found.

<% end %>

Results in:



Nothing found

The second function allows the following usage:



<% placeholder_unless @posts.any?, 'No posts found' do %>

  <%= render :partial => @post %>

<% end %>

The point is it all results in a nice, painless message with consistent markup and styling and I find it makes my code a bit more readable.

I'm sure the code could be optimized but for now it works.

link_to_remote_unless_current

danger (Danger) — Wed, 14 Jun 2006 09:53:44 GMT

// Full discussion about this available at:
// http://6brand.com/articles/2006/06/07/link_to_remote_unless_current



# throw this in one of your controller helpers.

# it works just like a combination of link_to_unless_current and link_to_remote

def link_to_remote_unless_current(name, options = {}, html_options = {}, *parameters_for_method_reference, &block)

  if current_page?(options[:url])

    if block_given?

      block.arity <= 1 ? yield(name) : yield(name, remote_function(options), html_options, *parameters_for_method_reference)

    else

      name

    end

  else

    link_to_function(name, remote_function(options), html_options)

  end

end

Loading ActionView helpers

technoweenie (Rick Olson) — Fri, 08 Jul 2005 14:59:46 GMT

This lets you load ActionView helpers globally.

RAILS_ROOT/lib/action_view/helpers/widget_helper.rb:



module ActionView

  module Helpers

    module WidgetHelper

      # define helper methods

    end

  end

end

RAILS_ROOT/config/environment.rb:



require "#{RAILS_ROOT}/lib/action_view/helpers/widget_helper.rb"

ActionView::Base.class_eval do

  include ActionView::Helpers::WidgetHelper

end



Custom captures
mdaines (Michael Daines) — Fri, 17 Jun 2005 09:18:27 GMT
I made a layout with some slightly ugly code for making rounded boxes with CSS and HTML, and wanted a way to automate the boxes. I had thought of having two functions to print starting and ending code, but this seems nicer.



This goes with the other application helpers:





  def rounded_box(&block)

    concat '
' + capture(&block) + '
', block.binding

  end





This goes in a view:





<% rounded_box do %>



... stuff to put in the rounded box ...



<% end %>