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Handling HTML in Templates with Action Pack

In this seventeenth part of an eighteen-part series on the Action Pack library for Rails, you'll learn how and why to escape HTML in templates, and more. This article is excerpted from chapter six of the book Beginning Rails: From Novice to Professional, written by Jeffery Allan Hardy, Cloves Carneiro Jr. and Hampton Catlin (Apress; ISBN: 1590596862).

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By: Apress Publishing
Rating: 5 stars5 stars5 stars5 stars5 stars / 2
August 04, 2011
  1. · Handling HTML in Templates with Action Pack
  2. · Adding Custom Helpers

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Handling HTML in Templates with Action Pack - Adding Custom Helpers
(Page 2 of 2 )

Our events application is looking pretty good, but we would like to make it a bit more user-friendly. One thing we can do is add helpful cancel links beside each of the submit buttons on the forms, so that itís possible for users to back out of editing. We could do this by adding link_to helpers beside each button, but then we would need to do this for every form. Since weíll probably want to repeat this pattern throughout the application, this could end up being a lot of duplication. Why donít we create our own custom helper to do this for us? Listing 6-29 shows the method submit_tag_or_cancel added to the application_helper .

Listing 6-29. The app/helpers/application_helper.rb File

module ApplicationHelper # Creates a submit button with the given name with a cancel link # Accepts a hash of options in url_for format to create the cancel link def submit_tag_or_cancel(name, options={})

options = 'javascript:history.go(-1);' if options.empty? "#{submit_tag(name)} or #{link_to 'Cancel', options, :class => 'cancel' }" end end

Now letís use this helper on our forms. Open both the new and edit templates and update them so they look like Listings 6-30 and 6-31.

Listing 6-30. Updated app/views/events/new.rhtml

<h1>New event</h1>

<% form_tag :action => 'create' do %> <%= render :partial => 'form' %> <%= submit_tag_or_cancel "Create" %>

<% end %>

Listing 6-31. Updated app/views/events/edit.rhtml

<h1>Editing event</h1>

<% form_tag :action => 'update', :id => @event do %> <%= render :partial => 'form' %> <%= submit_tag_or_cancel 'Save Changes' %>

<% end %>

Please check back for the conclusion to this series.

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