require 'action_view/helpers/javascript_helper'
module ActionView
module Helpers #:nodoc:
# Provides a set of methods for making easy links and getting urls that
# depend on the controller and action. This means that you can use the
# same format for links in the views that you do in the controller.
module UrlHelper
include JavaScriptHelper
# Returns the URL for the set of +options+ provided. This takes the
# same options as url_for in action controller. For a list, see the
# documentation for ActionController::Base#url_for. Note that it'll
# set :only_path => true so you'll get the relative /controller/action
# instead of the fully qualified http://example.com/controller/action.
#
# When called from a view, url_for returns an HTML escaped url. If you
# need an unescaped url, pass :escape => false in the +options+.
def url_for(options = {}, *parameters_for_method_reference)
if options.kind_of? Hash
options = { :only_path => true }.update(options.symbolize_keys)
escape = options.key?(:escape) ? options.delete(:escape) : true
else
escape = true
end
url = @controller.send(:url_for, options, *parameters_for_method_reference)
escape ? html_escape(url) : url
end
# Creates a link tag of the given +name+ using a URL created by the set
# of +options+. See the valid options in the documentation for
# ActionController::Base#url_for. It's also possible to pass a string instead
# of an options hash to get a link tag that uses the value of the string as the
# href for the link. If nil is passed as a name, the link itself will become
# the name.
#
# The +html_options+ will accept a hash of html attributes for the link tag.
# It also accepts 3 modifiers that specialize the link behavior.
#
# * <tt>:confirm => 'question?'</tt>: This will add a JavaScript confirm
# prompt with the question specified. If the user accepts, the link is
# processed normally, otherwise no action is taken.
# * <tt>:popup => true || array of window options</tt>: This will force the
# link to open in a popup window. By passing true, a default browser window
# will be opened with the URL. You can also specify an array of options
# that are passed-thru to JavaScripts window.open method.
# * <tt>:method => symbol of HTTP verb</tt>: This modifier will dynamically
# create an HTML form and immediately submit the form for processing using
# the HTTP verb specified. Useful for having links perform a POST operation
# in dangerous actions like deleting a record (which search bots can follow
# while spidering your site). Supported verbs are :post, :delete and :put.
# Note that if the user has JavaScript disabled, the request will fall back
# to using GET. If you are relying on the POST behavior, your should check
# for it in your controllers action by using the request objects methods
# for post?, delete? or put?.
#
# You can mix and match the +html_options+ with the exception of
# :popup and :method which will raise an ActionView::ActionViewError
# exception.
#
# link_to "Visit Other Site", "http://www.rubyonrails.org/", :confirm => "Are you sure?"
# link_to "Help", { :action => "help" }, :popup => true
# link_to "View Image", { :action => "view" }, :popup => ['new_window_name', 'height=300,width=600']
# link_to "Delete Image", { :action => "delete", :id => @image.id }, :confirm => "Are you sure?", :method => :delete
def link_to(name, options = {}, html_options = nil, *parameters_for_method_reference)
if html_options
html_options = html_options.stringify_keys
convert_options_to_javascript!(html_options)
tag_options = tag_options(html_options)
else
tag_options = nil
end
url = options.is_a?(String) ? options : self.url_for(options, *parameters_for_method_reference)
"<a href=\"#{url}\"#{tag_options}>#{name || url}</a>"
end
# Generates a form containing a single button that submits to the URL created
# by the set of +options+. This is the safest method to ensure links that
# cause changes to your data are not triggered by search bots or accelerators.
# If the HTML button does not work with your layout, you can also consider
# using the link_to method with the <tt>:method</tt> modifier as described in
# the link_to documentation.
#
# The generated FORM element has a class name of <tt>button-to</tt>
# to allow styling of the form itself and its children. You can control
# the form submission and input element behavior using +html_options+.
# This method accepts the <tt>:method</tt> and <tt>:confirm</tt> modifiers
# described in the link_to documentation. If no <tt>:method</tt> modifier
# is given, it will default to performing a POST operation. You can also
# disable the button by passing <tt>:disabled => true</tt> in +html_options+.
#
# button_to "New", :action => "new"
#
# Generates the following HTML:
#
# <form method="post" action="/controller/new" class="button-to">
# <div><input value="New" type="submit" /></div>
# </form>
#
# If you are using RESTful routes, you can pass the <tt>:method</tt>
# to change the HTTP verb used to submit the form.
#
# button_to "Delete Image", { :action => "delete", :id => @image.id },
# :confirm => "Are you sure?", :method => :delete
#
# Which generates the following HTML:
#
# <form method="post" action="/images/delete/1" class="button-to">
# <div>
# <input type="hidden" name="_method" value="delete" />
# <input onclick="return confirm('Are you sure?');"
# value="Delete" type="submit" />
# </div>
# </form>
def button_to(name, options = {}, html_options = {})
html_options = html_options.stringify_keys
convert_boolean_attributes!(html_options, %w( disabled ))
method_tag = ''
if (method = html_options.delete('method')) && %w{put delete}.include?(method.to_s)
method_tag = tag('input', :type => 'hidden', :name => '_method', :value => method.to_s)
end
form_method = method.to_s == 'get' ? 'get' : 'post'
if confirm = html_options.delete("confirm")
html_options["onclick"] = "return #{confirm_javascript_function(confirm)};"
end
url = options.is_a?(String) ? options : self.url_for(options)
name ||= url
html_options.merge!("type" => "submit", "value" => name)
"<form method=\"#{form_method}\" action=\"#{escape_once url}\" class=\"button-to\"><div>" +
method_tag + tag("input", html_options) + "</div></form>"
end
# Creates a link tag of the given +name+ using a URL created by the set of
# +options+ unless the current request uri is the same as the links, in
# which case only the name is returned (or the given block is yielded, if
# one exists). Refer to the documentation for link_to_unless for block usage.
#
# <ul id="navbar">
# <li><%= link_to_unless_current("Home", { :action => "index" }) %></li>
# <li><%= link_to_unless_current("About Us", { :action => "about" }) %></li>
# </ul>
#
# This will render the following HTML when on the about us page:
#
# <ul id="navbar">
# <li><a href="/controller/index">Home</a></li>
# <li>About Us</li>
# </ul>
def link_to_unless_current(name, options = {}, html_options = {}, *parameters_for_method_reference, &block)
link_to_unless current_page?(options), name, options, html_options, *parameters_for_method_reference, &block
end
# Creates a link tag of the given +name+ using a URL created by the set of
# +options+ unless +condition+ is true, in which case only the name is
# returned. To specialize the default behavior, you can pass a block that
# accepts the name or the full argument list for link_to_unless (see the example).
#
# <%= link_to_unless(@current_user.nil?, "Reply", { :action => "reply" }) %>
#
# This example uses a block to modify the link if the condition isn't met.
#
# <%= link_to_unless(@current_user.nil?, "Reply", { :action => "reply" }) do |name|
# link_to(name, { :controller => "accounts", :action => "signup" })
# end %>
def link_to_unless(condition, name, options = {}, html_options = {}, *parameters_for_method_reference, &block)
if condition
if block_given?
block.arity <= 1 ? yield(name) : yield(name, options, html_options, *parameters_for_method_reference)
else
name
end
else
link_to(name, options, html_options, *parameters_for_method_reference)
end
end
# Creates a link tag of the given +name+ using a URL created by the set of
# +options+ if +condition+ is true, in which case only the name is
# returned. To specialize the default behavior, you can pass a block that
# accepts the name or the full argument list for link_to_unless (see the examples
# in link_to_unless).
def link_to_if(condition, name, options = {}, html_options = {}, *parameters_for_method_reference, &block)
link_to_unless !condition, name, options, html_options, *parameters_for_method_reference, &block
end
# Creates a mailto link tag to the specified +email_address+, which is
# also used as the name of the link unless +name+ is specified. Additional
# html attributes for the link can be passed in +html_options+.
#
# mail_to has several methods for hindering email harvestors and customizing
# the email itself by passing special keys to +html_options+.
#
# Special HTML Options:
#
# * <tt>:encode</tt> - This key will accept the strings "javascript" or "hex".
# Passing "javascript" will dynamically create and encode the mailto: link then
# eval it into the DOM of the page. This method will not show the link on
# the page if the user has JavaScript disabled. Passing "hex" will hex
# encode the +email_address+ before outputting the mailto: link.
# * <tt>:replace_at</tt> - When the link +name+ isn't provided, the
# +email_address+ is used for the link label. You can use this option to
# obfuscate the +email_address+ by substituting the @ sign with the string
# given as the value.
# * <tt>:replace_dot</tt> - When the link +name+ isn't provided, the
# +email_address+ is used for the link label. You can use this option to
# obfuscate the +email_address+ by substituting the . in the email with the
# string given as the value.
# * <tt>:subject</tt> - Preset the subject line of the email.
# * <tt>:body</tt> - Preset the body of the email.
# * <tt>:cc</tt> - Carbon Copy addition recipients on the email.
# * <tt>:bcc</tt> - Blind Carbon Copy additional recipients on the email.
#
# Examples:
# mail_to "me@domain.com" # => <a href="mailto:me@domain.com">me@domain.com</a>
# mail_to "me@domain.com", "My email", :encode => "javascript" # =>
# <script type="text/javascript">eval(unescape('%64%6f%63...%6d%65%6e'))</script>
#
# mail_to "me@domain.com", "My email", :encode => "hex" # =>
# <a href="mailto:%6d%65@%64%6f%6d%61%69%6e.%63%6f%6d">My email</a>
#
# mail_to "me@domain.com", nil, :replace_at => "_at_", :replace_dot => "_dot_", :class => "email" # =>
# <a href="mailto:me@domain.com" class="email">me_at_domain_dot_com</a>
#
# mail_to "me@domain.com", "My email", :cc => "ccaddress@domain.com",
# :subject => "This is an example email" # =>
# <a href="mailto:me@domain.com?cc=ccaddress@domain.com&subject=This%20is%20an%20example%20email">My email</a>
def mail_to(email_address, name = nil, html_options = {})
html_options = html_options.stringify_keys
encode = html_options.delete("encode").to_s
cc, bcc, subject, body = html_options.delete("cc"), html_options.delete("bcc"), html_options.delete("subject"), html_options.delete("body")
string = ''
extras = ''
extras << "cc=#{CGI.escape(cc).gsub("+", "%20")}&" unless cc.nil?
extras << "bcc=#{CGI.escape(bcc).gsub("+", "%20")}&" unless bcc.nil?
extras << "body=#{CGI.escape(body).gsub("+", "%20")}&" unless body.nil?
extras << "subject=#{CGI.escape(subject).gsub("+", "%20")}&" unless subject.nil?
extras = "?" << extras.gsub!(/&?$/,"") unless extras.empty?
email_address = email_address.to_s
email_address_obfuscated = email_address.dup
email_address_obfuscated.gsub!(/@/, html_options.delete("replace_at")) if html_options.has_key?("replace_at")
email_address_obfuscated.gsub!(/\./, html_options.delete("replace_dot")) if html_options.has_key?("replace_dot")
if encode == "javascript"
tmp = "document.write('#{content_tag("a", name || email_address, html_options.merge({ "href" => "mailto:"+email_address+extras }))}');"
for i in 0...tmp.length
string << sprintf("%%%x",tmp[i])
end
"<script type=\"#{Mime::JS}\">eval(unescape('#{string}'))</script>"
elsif encode == "hex"
email_address_encoded = ''
email_address_obfuscated.each_byte do |c|
email_address_encoded << sprintf("&#%d;", c)
end
protocol = 'mailto:'
protocol.each_byte { |c| string << sprintf("&#%d;", c) }
for i in 0...email_address.length
if email_address[i,1] =~ /\w/
string << sprintf("%%%x",email_address[i])
else
string << email_address[i,1]
end
end
content_tag "a", name || email_address_encoded, html_options.merge({ "href" => "#{string}#{extras}" })
else
content_tag "a", name || email_address_obfuscated, html_options.merge({ "href" => "mailto:#{email_address}#{extras}" })
end
end
# True if the current request uri was generated by the given +options+.
def current_page?(options)
url_string = CGI.escapeHTML(url_for(options))
request = @controller.request
if url_string =~ /^\w+:\/\//
url_string == "#{request.protocol}#{request.host_with_port}#{request.request_uri}"
else
url_string == request.request_uri
end
end
private
def convert_options_to_javascript!(html_options)
confirm, popup = html_options.delete("confirm"), html_options.delete("popup")
method = html_options.delete("method")
html_options["onclick"] = case
when popup && method
raise ActionView::ActionViewError, "You can't use :popup and :method in the same link"
when confirm && popup
"if (#{confirm_javascript_function(confirm)}) { #{popup_javascript_function(popup)} };return false;"
when confirm && method
"if (#{confirm_javascript_function(confirm)}) { #{method_javascript_function(method)} };return false;"
when confirm
"return #{confirm_javascript_function(confirm)};"
when method
"#{method_javascript_function(method)}return false;"
when popup
popup_javascript_function(popup) + 'return false;'
else
html_options["onclick"]
end
end
def confirm_javascript_function(confirm)
"confirm('#{escape_javascript(confirm)}')"
end
def popup_javascript_function(popup)
popup.is_a?(Array) ? "window.open(this.href,'#{popup.first}','#{popup.last}');" : "window.open(this.href);"
end
def method_javascript_function(method)
submit_function =
"var f = document.createElement('form'); f.style.display = 'none'; " +
"this.parentNode.appendChild(f); f.method = 'POST'; f.action = this.href;"
unless method == :post
submit_function << "var m = document.createElement('input'); m.setAttribute('type', 'hidden'); "
submit_function << "m.setAttribute('name', '_method'); m.setAttribute('value', '#{method}'); f.appendChild(m);"
end
submit_function << "f.submit();"
end
# Processes the _html_options_ hash, converting the boolean
# attributes from true/false form into the form required by
# HTML/XHTML. (An attribute is considered to be boolean if
# its name is listed in the given _bool_attrs_ array.)
#
# More specifically, for each boolean attribute in _html_options_
# given as:
#
# "attr" => bool_value
#
# if the associated _bool_value_ evaluates to true, it is
# replaced with the attribute's name; otherwise the attribute is
# removed from the _html_options_ hash. (See the XHTML 1.0 spec,
# section 4.5 "Attribute Minimization" for more:
# http://www.w3.org/TR/xhtml1/#h-4.5)
#
# Returns the updated _html_options_ hash, which is also modified
# in place.
#
# Example:
#
# convert_boolean_attributes!( html_options,
# %w( checked disabled readonly ) )
def convert_boolean_attributes!(html_options, bool_attrs)
bool_attrs.each { |x| html_options[x] = x if html_options.delete(x) }
html_options
end
end
end
end
