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require 'action_view/helpers/javascript_helper'
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require 'active_support/core_ext/array/access'
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require 'active_support/core_ext/hash/keys'
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require 'active_support/core_ext/string/output_safety'
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require 'action_dispatch'
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# = Action View URL Helpers
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module Helpers #:nodoc:
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# Provides a set of methods for making links and getting URLs that
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# depend on the routing subsystem (see ActionDispatch::Routing).
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# This allows you to use the same format for links in views
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# This helper may be included in any class that includes the
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# URL helpers of a routes (routes.url_helpers). Some methods
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# provided here will only work in the context of a request
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# (link_to_unless_current, for instance), which must be provided
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# as a method called #request on the context.
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extend ActiveSupport::Concern
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include ActionDispatch::Routing::UrlFor
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# Need to map default url options to controller one.
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# def default_url_options(*args) #:nodoc:
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# controller.send(:default_url_options, *args)
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return super unless controller.respond_to?(:url_options)
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controller.url_options
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# Returns the URL for the set of +options+ provided. This takes the
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# same options as +url_for+ in Action Controller (see the
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# documentation for <tt>ActionController::Base#url_for</tt>). Note that by default
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# <tt>:only_path</tt> is <tt>true</tt> so you'll get the relative "/controller/action"
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# instead of the fully qualified URL like "http://example.com/controller/action".
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# * <tt>:anchor</tt> - Specifies the anchor name to be appended to the path.
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# * <tt>:only_path</tt> - If true, returns the relative URL (omitting the protocol, host name, and port) (<tt>true</tt> by default unless <tt>:host</tt> is specified).
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# * <tt>:trailing_slash</tt> - If true, adds a trailing slash, as in "/archive/2005/". Note that this
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# is currently not recommended since it breaks caching.
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# * <tt>:host</tt> - Overrides the default (current) host if provided.
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# * <tt>:protocol</tt> - Overrides the default (current) protocol if provided.
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# * <tt>:user</tt> - Inline HTTP authentication (only plucked out if <tt>:password</tt> is also present).
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# * <tt>:password</tt> - Inline HTTP authentication (only plucked out if <tt>:user</tt> is also present).
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# ==== Relying on named routes
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# Passing a record (like an Active Record or Active Resource) instead of a Hash as the options parameter will
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# trigger the named route for that record. The lookup will happen on the name of the class. So passing a
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# Workshop object will attempt to use the +workshop_path+ route. If you have a nested route, such as
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# +admin_workshop_path+ you'll have to call that explicitly (it's impossible for +url_for+ to guess that route).
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# <%= url_for(:action => 'index') %>
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# <%= url_for(:action => 'find', :controller => 'books') %>
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# <%= url_for(:action => 'login', :controller => 'members', :only_path => false, :protocol => 'https') %>
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# # => https://www.example.com/members/login/
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# <%= url_for(:action => 'play', :anchor => 'player') %>
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# # => /messages/play/#player
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# <%= url_for(:action => 'jump', :anchor => 'tax&ship') %>
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# # => /testing/jump/#tax&ship
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# <%= url_for(Workshop.new) %>
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# # relies on Workshop answering a persisted? call (and in this case returning false)
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# <%= url_for(@workshop) %>
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# # calls @workshop.to_param which by default returns the id
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# # to_param can be re-defined in a model to provide different URL names:
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# # => /workshops/1-workshop-name
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# <%= url_for("http://www.example.com") %>
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# # => http://www.example.com
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# <%= url_for(:back) %>
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# # if request.env["HTTP_REFERER"] is set to "http://www.example.com"
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# # => http://www.example.com
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# <%= url_for(:back) %>
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# # if request.env["HTTP_REFERER"] is not set or is blank
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# # => javascript:history.back()
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def url_for(options = {})
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options = options.symbolize_keys.reverse_merge!(:only_path => options[:host].nil?)
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controller.request.env["HTTP_REFERER"] || 'javascript:history.back()'
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polymorphic_path(options)
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# Creates a link tag of the given +name+ using a URL created by the set of +options+.
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# See the valid options in the documentation for +url_for+. It's also possible to
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# pass a String instead of an options hash, which generates a link tag that uses the
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# value of the String as the href for the link. Using a <tt>:back</tt> Symbol instead
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# of an options hash will generate a link to the referrer (a JavaScript back link
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# will be used in place of a referrer if none exists). If +nil+ is passed as the name
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# the value of the link itself will become the name.
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# link_to(body, url, html_options = {})
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# # url is a String; you can use URL helpers like
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# link_to(body, url_options = {}, html_options = {})
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# # url_options, except :confirm or :method,
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# # is passed to url_for
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# link_to(options = {}, html_options = {}) do
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# link_to(url, html_options = {}) do
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# * <tt>:confirm => 'question?'</tt> - This will allow the unobtrusive JavaScript
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# driver to prompt with the question specified. If the user accepts, the link is
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# processed normally, otherwise no action is taken.
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# * <tt>:method => symbol of HTTP verb</tt> - This modifier will dynamically
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# create an HTML form and immediately submit the form for processing using
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# the HTTP verb specified. Useful for having links perform a POST operation
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# in dangerous actions like deleting a record (which search bots can follow
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# while spidering your site). Supported verbs are <tt>:post</tt>, <tt>:delete</tt> and <tt>:put</tt>.
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# Note that if the user has JavaScript disabled, the request will fall back
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# to using GET. If <tt>:href => '#'</tt> is used and the user has JavaScript
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# disabled clicking the link will have no effect. If you are relying on the
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# POST behavior, you should check for it in your controller's action by using
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# the request object's methods for <tt>post?</tt>, <tt>delete?</tt> or <tt>put?</tt>.
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# * <tt>:remote => true</tt> - This will allow the unobtrusive JavaScript
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# driver to make an Ajax request to the URL in question instead of following
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# the link. The drivers each provide mechanisms for listening for the
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# completion of the Ajax request and performing JavaScript operations once
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# Because it relies on +url_for+, +link_to+ supports both older-style controller/action/id arguments
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# and newer RESTful routes. Current Rails style favors RESTful routes whenever possible, so base
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# your application on resources and use
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# link_to "Profile", profile_path(@profile)
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# # => <a href="/profiles/1">Profile</a>
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# or the even pithier
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# link_to "Profile", @profile
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# # => <a href="/profiles/1">Profile</a>
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# in place of the older more verbose, non-resource-oriented
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# link_to "Profile", :controller => "profiles", :action => "show", :id => @profile
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# # => <a href="/profiles/show/1">Profile</a>
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# link_to "Profiles", profiles_path
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# # => <a href="/profiles">Profiles</a>
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# link_to "Profiles", :controller => "profiles"
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# # => <a href="/profiles">Profiles</a>
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# You can use a block as well if your link target is hard to fit into the name parameter. ERB example:
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# <%= link_to(@profile) do %>
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# <strong><%= @profile.name %></strong> -- <span>Check it out!</span>
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# # => <a href="/profiles/1">
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# <strong>David</strong> -- <span>Check it out!</span>
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# Classes and ids for CSS are easy to produce:
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# link_to "Articles", articles_path, :id => "news", :class => "article"
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# # => <a href="/articles" class="article" id="news">Articles</a>
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# Be careful when using the older argument style, as an extra literal hash is needed:
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# link_to "Articles", { :controller => "articles" }, :id => "news", :class => "article"
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# # => <a href="/articles" class="article" id="news">Articles</a>
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# Leaving the hash off gives the wrong link:
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# link_to "WRONG!", :controller => "articles", :id => "news", :class => "article"
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# # => <a href="/articles/index/news?class=article">WRONG!</a>
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# +link_to+ can also produce links with anchors or query strings:
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# link_to "Comment wall", profile_path(@profile, :anchor => "wall")
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# # => <a href="/profiles/1#wall">Comment wall</a>
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# link_to "Ruby on Rails search", :controller => "searches", :query => "ruby on rails"
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# # => <a href="/searches?query=ruby+on+rails">Ruby on Rails search</a>
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# link_to "Nonsense search", searches_path(:foo => "bar", :baz => "quux")
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# # => <a href="/searches?foo=bar&baz=quux">Nonsense search</a>
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# The two options specific to +link_to+ (<tt>:confirm</tt> and <tt>:method</tt>) are used as follows:
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# link_to "Visit Other Site", "http://www.rubyonrails.org/", :confirm => "Are you sure?"
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# # => <a href="http://www.rubyonrails.org/" data-confirm="Are you sure?"">Visit Other Site</a>
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# link_to("Destroy", "http://www.example.com", :method => :delete, :confirm => "Are you sure?")
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# # => <a href='http://www.example.com' rel="nofollow" data-method="delete" data-confirm="Are you sure?">Destroy</a>
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def link_to(*args, &block)
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options = args.first || {}
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html_options = args.second
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link_to(capture(&block), options, html_options)
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options = args[1] || {}
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html_options = args[2]
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html_options = convert_options_to_data_attributes(options, html_options)
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url = url_for(options)
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href = html_options['href']
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tag_options = tag_options(html_options)
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href_attr = "href=\"#{ERB::Util.html_escape(url)}\"" unless href
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"<a #{href_attr}#{tag_options}>#{ERB::Util.html_escape(name || url)}</a>".html_safe
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# Generates a form containing a single button that submits to the URL created
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# by the set of +options+. This is the safest method to ensure links that
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# cause changes to your data are not triggered by search bots or accelerators.
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# If the HTML button does not work with your layout, you can also consider
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# using the +link_to+ method with the <tt>:method</tt> modifier as described in
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# the +link_to+ documentation.
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# By default, the generated form element has a class name of <tt>button_to</tt>
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# to allow styling of the form itself and its children. This can be changed
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# using the <tt>:form_class</tt> modifier within +html_options+. You can control
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# the form submission and input element behavior using +html_options+.
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# This method accepts the <tt>:method</tt> and <tt>:confirm</tt> modifiers
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# described in the +link_to+ documentation. If no <tt>:method</tt> modifier
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# is given, it will default to performing a POST operation. You can also
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# disable the button by passing <tt>:disabled => true</tt> in +html_options+.
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# If you are using RESTful routes, you can pass the <tt>:method</tt>
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# to change the HTTP verb used to submit the form.
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# The +options+ hash accepts the same options as +url_for+.
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# There are a few special +html_options+:
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# * <tt>:method</tt> - Symbol of HTTP verb. Supported verbs are <tt>:post</tt>, <tt>:get</tt>,
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# <tt>:delete</tt> and <tt>:put</tt>. By default it will be <tt>:post</tt>.
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# * <tt>:disabled</tt> - If set to true, it will generate a disabled button.
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# * <tt>:confirm</tt> - This will use the unobtrusive JavaScript driver to
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# prompt with the question specified. If the user accepts, the link is
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# processed normally, otherwise no action is taken.
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# * <tt>:remote</tt> - If set to true, will allow the Unobtrusive JavaScript drivers to control the
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# submit behavior. By default this behavior is an ajax submit.
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# * <tt>:form</tt> - This hash will be form attributes
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# * <tt>:form_class</tt> - This controls the class of the form within which the submit button will
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# <%= button_to "New", :action => "new" %>
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# # => "<form method="post" action="/controller/new" class="button_to">
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# # <div><input value="New" type="submit" /></div>
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# <%= button_to "New", :action => "new", :form_class => "new-thing" %>
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# # => "<form method="post" action="/controller/new" class="new-thing">
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# # <div><input value="New" type="submit" /></div>
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# <%= button_to "Create", :action => "create", :remote => true, :form => { "data-type" => "json" } %>
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# # => "<form method="post" action="/images/create" class="button_to" data-remote="true" data-type="json">
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# # <div><input value="Create" type="submit" /></div>
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# <%= button_to "Delete Image", { :action => "delete", :id => @image.id },
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# :confirm => "Are you sure?", :method => :delete %>
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# # => "<form method="post" action="/images/delete/1" class="button_to">
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# # <input type="hidden" name="_method" value="delete" />
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# # <input data-confirm='Are you sure?' value="Delete" type="submit" />
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# <%= button_to('Destroy', 'http://www.example.com', :confirm => 'Are you sure?',
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# :method => "delete", :remote => true, :disable_with => 'loading...') %>
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# # => "<form class='button_to' method='post' action='http://www.example.com' data-remote='true'>
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# # <input name='_method' value='delete' type='hidden' />
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# # <input value='Destroy' type='submit' disable_with='loading...' data-confirm='Are you sure?' />
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def button_to(name, options = {}, html_options = {})
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html_options = html_options.stringify_keys
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convert_boolean_attributes!(html_options, %w( disabled ))
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if (method = html_options.delete('method')) && %w{put delete}.include?(method.to_s)
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method_tag = tag('input', :type => 'hidden', :name => '_method', :value => method.to_s)
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form_method = method.to_s == 'get' ? 'get' : 'post'
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form_options = html_options.delete('form') || {}
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form_options[:class] ||= html_options.delete('form_class') || 'button_to'
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remote = html_options.delete('remote')
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request_token_tag = ''
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if form_method == 'post' && protect_against_forgery?
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request_token_tag = tag(:input, :type => "hidden", :name => request_forgery_protection_token.to_s, :value => form_authenticity_token)
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url = options.is_a?(String) ? options : self.url_for(options)
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html_options = convert_options_to_data_attributes(options, html_options)
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html_options.merge!("type" => "submit", "value" => name)
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form_options.merge!(:method => form_method, :action => url)
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form_options.merge!("data-remote" => "true") if remote
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"#{tag(:form, form_options, true)}<div>#{method_tag}#{tag("input", html_options)}#{request_token_tag}</div></form>".html_safe
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# Creates a link tag of the given +name+ using a URL created by the set of
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# +options+ unless the current request URI is the same as the links, in
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# which case only the name is returned (or the given block is yielded, if
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# one exists). You can give +link_to_unless_current+ a block which will
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# specialize the default behavior (e.g., show a "Start Here" link rather
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# than the link's text).
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# Let's say you have a navigation menu...
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# <li><%= link_to_unless_current("Home", { :action => "index" }) %></li>
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# <li><%= link_to_unless_current("About Us", { :action => "about" }) %></li>
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# If in the "about" action, it will render...
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# <li><a href="/controller/index">Home</a></li>
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# ...but if in the "index" action, it will render:
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# <li><a href="/controller/about">About Us</a></li>
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# The implicit block given to +link_to_unless_current+ is evaluated if the current
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# action is the action given. So, if we had a comments page and wanted to render a
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# "Go Back" link instead of a link to the comments page, we could do something like this...
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# link_to_unless_current("Comment", { :controller => "comments", :action => "new" }) do
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# link_to("Go back", { :controller => "posts", :action => "index" })
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def link_to_unless_current(name, options = {}, html_options = {}, &block)
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link_to_unless current_page?(options), name, options, html_options, &block
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# Creates a link tag of the given +name+ using a URL created by the set of
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# +options+ unless +condition+ is true, in which case only the name is
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# returned. To specialize the default behavior (i.e., show a login link rather
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# than just the plaintext link text), you can pass a block that
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# accepts the name or the full argument list for +link_to_unless+.
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# <%= link_to_unless(@current_user.nil?, "Reply", { :action => "reply" }) %>
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# # If the user is logged in...
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# # => <a href="/controller/reply/">Reply</a>
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# link_to_unless(@current_user.nil?, "Reply", { :action => "reply" }) do |name|
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# link_to(name, { :controller => "accounts", :action => "signup" })
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# # If the user is logged in...
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# # => <a href="/controller/reply/">Reply</a>
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# # => <a href="/accounts/signup">Reply</a>
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def link_to_unless(condition, name, options = {}, html_options = {}, &block)
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block.arity <= 1 ? capture(name, &block) : capture(name, options, html_options, &block)
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link_to(name, options, html_options)
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# Creates a link tag of the given +name+ using a URL created by the set of
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# +options+ if +condition+ is true, otherwise only the name is
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# returned. To specialize the default behavior, you can pass a block that
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# accepts the name or the full argument list for +link_to_unless+ (see the examples
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# in +link_to_unless+).
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# <%= link_to_if(@current_user.nil?, "Login", { :controller => "sessions", :action => "new" }) %>
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# # If the user isn't logged in...
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# # => <a href="/sessions/new/">Login</a>
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# link_to_if(@current_user.nil?, "Login", { :controller => "sessions", :action => "new" }) do
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# link_to(@current_user.login, { :controller => "accounts", :action => "show", :id => @current_user })
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# # If the user isn't logged in...
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# # => <a href="/sessions/new/">Login</a>
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# # If they are logged in...
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# # => <a href="/accounts/show/3">my_username</a>
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def link_to_if(condition, name, options = {}, html_options = {}, &block)
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link_to_unless !condition, name, options, html_options, &block
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# Creates a mailto link tag to the specified +email_address+, which is
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# also used as the name of the link unless +name+ is specified. Additional
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# HTML attributes for the link can be passed in +html_options+.
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# +mail_to+ has several methods for hindering email harvesters and customizing
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# the email itself by passing special keys to +html_options+.
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# * <tt>:encode</tt> - This key will accept the strings "javascript" or "hex".
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# Passing "javascript" will dynamically create and encode the mailto link then
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# eval it into the DOM of the page. This method will not show the link on
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# the page if the user has JavaScript disabled. Passing "hex" will hex
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# encode the +email_address+ before outputting the mailto link.
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# * <tt>:replace_at</tt> - When the link +name+ isn't provided, the
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# +email_address+ is used for the link label. You can use this option to
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# obfuscate the +email_address+ by substituting the @ sign with the string
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# given as the value.
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# * <tt>:replace_dot</tt> - When the link +name+ isn't provided, the
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# +email_address+ is used for the link label. You can use this option to
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# obfuscate the +email_address+ by substituting the . in the email with the
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# string given as the value.
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# * <tt>:subject</tt> - Preset the subject line of the email.
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# * <tt>:body</tt> - Preset the body of the email.
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# * <tt>:cc</tt> - Carbon Copy additional recipients on the email.
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# * <tt>:bcc</tt> - Blind Carbon Copy additional recipients on the email.
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# mail_to "me@domain.com"
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# # => <a href="mailto:me@domain.com">me@domain.com</a>
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# mail_to "me@domain.com", "My email", :encode => "javascript"
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# # => <script type="text/javascript">eval(decodeURIComponent('%64%6f%63...%27%29%3b'))</script>
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# mail_to "me@domain.com", "My email", :encode => "hex"
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# # => <a href="mailto:%6d%65@%64%6f%6d%61%69%6e.%63%6f%6d">My email</a>
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# mail_to "me@domain.com", nil, :replace_at => "_at_", :replace_dot => "_dot_", :class => "email"
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# # => <a href="mailto:me@domain.com" class="email">me_at_domain_dot_com</a>
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# mail_to "me@domain.com", "My email", :cc => "ccaddress@domain.com",
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# :subject => "This is an example email"
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# # => <a href="mailto:me@domain.com?cc=ccaddress@domain.com&subject=This%20is%20an%20example%20email">My email</a>
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def mail_to(email_address, name = nil, html_options = {})
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email_address = ERB::Util.html_escape(email_address)
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html_options = html_options.stringify_keys
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encode = html_options.delete("encode").to_s
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extras = %w{ cc bcc body subject }.map { |item|
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option = html_options.delete(item) || next
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"#{item}=#{Rack::Utils.escape(option).gsub("+", "%20")}"
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extras = extras.empty? ? '' : '?' + ERB::Util.html_escape(extras.join('&'))
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email_address_obfuscated = email_address.to_str
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email_address_obfuscated.gsub!(/@/, html_options.delete("replace_at")) if html_options.key?("replace_at")
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email_address_obfuscated.gsub!(/\./, html_options.delete("replace_dot")) if html_options.key?("replace_dot")
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html = content_tag("a", name || email_address_obfuscated.html_safe, html_options.merge("href" => "mailto:#{email_address}#{extras}".html_safe))
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html = escape_javascript(html.to_str)
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"document.write('#{html}');".each_byte do |c|
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string << sprintf("%%%x", c)
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"<script type=\"#{Mime::JS}\">eval(decodeURIComponent('#{string}'))</script>".html_safe
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email_address_encoded = email_address_obfuscated.unpack('C*').map {|c|
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string = 'mailto:'.unpack('C*').map { |c|
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}.join + email_address.unpack('C*').map { |c|
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char =~ /\w/ ? sprintf("%%%x", c) : char
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content_tag "a", name || email_address_encoded.html_safe, html_options.merge("href" => "#{string}#{extras}".html_safe)
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content_tag "a", name || email_address_obfuscated.html_safe, html_options.merge("href" => "mailto:#{email_address}#{extras}".html_safe)
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# True if the current request URI was generated by the given +options+.
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# Let's say we're in the <tt>/shop/checkout?order=desc</tt> action.
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# current_page?(:action => 'process')
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# current_page?(:controller => 'shop', :action => 'checkout')
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# current_page?(:controller => 'shop', :action => 'checkout', :order => 'asc')
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# current_page?(:action => 'checkout')
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# current_page?(:controller => 'library', :action => 'checkout')
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# Let's say we're in the <tt>/shop/checkout?order=desc&page=1</tt> action.
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# current_page?(:action => 'process')
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# current_page?(:controller => 'shop', :action => 'checkout')
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# current_page?(:controller => 'shop', :action => 'checkout', :order => 'desc', :page => '1')
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# current_page?(:controller => 'shop', :action => 'checkout', :order => 'desc', :page => '2')
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# current_page?(:controller => 'shop', :action => 'checkout', :order => 'desc')
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# current_page?(:action => 'checkout')
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# current_page?(:controller => 'library', :action => 'checkout')
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# Let's say we're in the <tt>/products</tt> action with method POST in case of invalid product.
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# current_page?(:controller => 'product', :action => 'index')
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def current_page?(options)
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raise "You cannot use helpers that need to determine the current " \
591
"page unless your view context provides a Request object " \
592
"in a #request method"
595
return false unless request.get?
597
url_string = url_for(options)
599
# We ignore any extra parameters in the request_uri if the
600
# submitted url doesn't have any either. This lets the function
601
# work with things like ?order=asc
602
if url_string.index("?")
603
request_uri = request.fullpath
605
request_uri = request.path
608
if url_string =~ /^\w+:\/\//
609
url_string == "#{request.protocol}#{request.host_with_port}#{request_uri}"
611
url_string == request_uri
616
def convert_options_to_data_attributes(options, html_options)
618
html_options = html_options.stringify_keys
619
html_options['data-remote'] = 'true' if link_to_remote_options?(options) || link_to_remote_options?(html_options)
621
disable_with = html_options.delete("disable_with")
622
confirm = html_options.delete('confirm')
623
method = html_options.delete('method')
625
html_options["data-disable-with"] = disable_with if disable_with
626
html_options["data-confirm"] = confirm if confirm
627
add_method_to_attributes!(html_options, method) if method
631
link_to_remote_options?(options) ? {'data-remote' => 'true'} : {}
635
def link_to_remote_options?(options)
636
options.is_a?(Hash) && options.key?('remote') && options.delete('remote')
639
def add_method_to_attributes!(html_options, method)
640
if method && method.to_s.downcase != "get" && html_options["rel"] !~ /nofollow/
641
html_options["rel"] = "#{html_options["rel"]} nofollow".strip
643
html_options["data-method"] = method
646
def options_for_javascript(options)
650
"{#{options.keys.map { |k| "#{k}:#{options[k]}" }.sort.join(', ')}}"
654
def array_or_string_for_javascript(option)
655
if option.kind_of?(Array)
656
"['#{option.join('\',\'')}']"
662
# Processes the +html_options+ hash, converting the boolean
663
# attributes from true/false form into the form required by
664
# HTML/XHTML. (An attribute is considered to be boolean if
665
# its name is listed in the given +bool_attrs+ array.)
667
# More specifically, for each boolean attribute in +html_options+
670
# "attr" => bool_value
672
# if the associated +bool_value+ evaluates to true, it is
673
# replaced with the attribute's name; otherwise the attribute is
674
# removed from the +html_options+ hash. (See the XHTML 1.0 spec,
675
# section 4.5 "Attribute Minimization" for more:
676
# http://www.w3.org/TR/xhtml1/#h-4.5)
678
# Returns the updated +html_options+ hash, which is also modified
683
# convert_boolean_attributes!( html_options,
684
# %w( checked disabled readonly ) )
685
def convert_boolean_attributes!(html_options, bool_attrs)
686
bool_attrs.each { |x| html_options[x] = x if html_options.delete(x) }
added
removed
lib/action_view/helpers/url_helper.rb
