/
asset_tag_helper.rb
329 lines (310 loc) · 15.5 KB
/
asset_tag_helper.rb
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require 'active_support/core_ext/array/extract_options'
require 'active_support/core_ext/hash/keys'
require 'action_view/helpers/asset_url_helper'
require 'action_view/helpers/tag_helper'
module ActionView
# = Action View Asset Tag Helpers
module Helpers #:nodoc:
# This module provides methods for generating HTML that links views to assets such
# as images, JavaScripts, stylesheets, and feeds. These methods do not verify
# the assets exist before linking to them:
#
# image_tag("rails.png")
# # => <img alt="Rails" src="/assets/rails.png" />
# stylesheet_link_tag("application")
# # => <link href="/assets/application.css?body=1" media="screen" rel="stylesheet" />
module AssetTagHelper
extend ActiveSupport::Concern
include AssetUrlHelper
include TagHelper
# Returns an HTML script tag for each of the +sources+ provided.
#
# Sources may be paths to JavaScript files. Relative paths are assumed to be relative
# to <tt>assets/javascripts</tt>, full paths are assumed to be relative to the document
# root. Relative paths are idiomatic, use absolute paths only when needed.
#
# When passing paths, the ".js" extension is optional. If you do not want ".js"
# appended to the path <tt>extname: false</tt> can be set on the options.
#
# You can modify the HTML attributes of the script tag by passing a hash as the
# last argument.
#
# When the Asset Pipeline is enabled, you can pass the name of your manifest as
# source, and include other JavaScript or CoffeeScript files inside the manifest.
#
# javascript_include_tag "xmlhr"
# # => <script src="/assets/xmlhr.js?1284139606"></script>
#
# javascript_include_tag "template.jst", extname: false
# # => <script src="/assets/template.jst?1284139606"></script>
#
# javascript_include_tag "xmlhr.js"
# # => <script src="/assets/xmlhr.js?1284139606"></script>
#
# javascript_include_tag "common.javascript", "/elsewhere/cools"
# # => <script src="/assets/common.javascript?1284139606"></script>
# # <script src="/elsewhere/cools.js?1423139606"></script>
#
# javascript_include_tag "http://www.example.com/xmlhr"
# # => <script src="http://www.example.com/xmlhr"></script>
#
# javascript_include_tag "http://www.example.com/xmlhr.js"
# # => <script src="http://www.example.com/xmlhr.js"></script>
def javascript_include_tag(*sources)
options = sources.extract_options!.stringify_keys
path_options = options.extract!('protocol', 'extname').symbolize_keys
sources.uniq.map { |source|
tag_options = {
"src" => path_to_javascript(source, path_options)
}.merge!(options)
content_tag(:script, "", tag_options)
}.join("\n").html_safe
end
# Returns a stylesheet link tag for the sources specified as arguments. If
# you don't specify an extension, <tt>.css</tt> will be appended automatically.
# You can modify the link attributes by passing a hash as the last argument.
# For historical reasons, the 'media' attribute will always be present and defaults
# to "screen", so you must explicitly set it to "all" for the stylesheet(s) to
# apply to all media types.
#
# stylesheet_link_tag "style"
# # => <link href="/assets/style.css" media="screen" rel="stylesheet" />
#
# stylesheet_link_tag "style.css"
# # => <link href="/assets/style.css" media="screen" rel="stylesheet" />
#
# stylesheet_link_tag "http://www.example.com/style.css"
# # => <link href="http://www.example.com/style.css" media="screen" rel="stylesheet" />
#
# stylesheet_link_tag "style", media: "all"
# # => <link href="/assets/style.css" media="all" rel="stylesheet" />
#
# stylesheet_link_tag "style", media: "print"
# # => <link href="/assets/style.css" media="print" rel="stylesheet" />
#
# stylesheet_link_tag "random.styles", "/css/stylish"
# # => <link href="/assets/random.styles" media="screen" rel="stylesheet" />
# # <link href="/css/stylish.css" media="screen" rel="stylesheet" />
def stylesheet_link_tag(*sources)
options = sources.extract_options!.stringify_keys
path_options = options.extract!('protocol').symbolize_keys
sources.uniq.map { |source|
tag_options = {
"rel" => "stylesheet",
"media" => "screen",
"href" => path_to_stylesheet(source, path_options)
}.merge!(options)
tag(:link, tag_options)
}.join("\n").html_safe
end
# Returns a link tag that browsers and feed readers can use to auto-detect
# an RSS or Atom feed. The +type+ can either be <tt>:rss</tt> (default) or
# <tt>:atom</tt>. Control the link options in url_for format using the
# +url_options+. You can modify the LINK tag itself in +tag_options+.
#
# ==== Options
#
# * <tt>:rel</tt> - Specify the relation of this link, defaults to "alternate"
# * <tt>:type</tt> - Override the auto-generated mime type
# * <tt>:title</tt> - Specify the title of the link, defaults to the +type+
#
# ==== Examples
#
# auto_discovery_link_tag
# # => <link rel="alternate" type="application/rss+xml" title="RSS" href="http://www.currenthost.com/controller/action" />
# auto_discovery_link_tag(:atom)
# # => <link rel="alternate" type="application/atom+xml" title="ATOM" href="http://www.currenthost.com/controller/action" />
# auto_discovery_link_tag(:rss, {action: "feed"})
# # => <link rel="alternate" type="application/rss+xml" title="RSS" href="http://www.currenthost.com/controller/feed" />
# auto_discovery_link_tag(:rss, {action: "feed"}, {title: "My RSS"})
# # => <link rel="alternate" type="application/rss+xml" title="My RSS" href="http://www.currenthost.com/controller/feed" />
# auto_discovery_link_tag(:rss, {controller: "news", action: "feed"})
# # => <link rel="alternate" type="application/rss+xml" title="RSS" href="http://www.currenthost.com/news/feed" />
# auto_discovery_link_tag(:rss, "http://www.example.com/feed.rss", {title: "Example RSS"})
# # => <link rel="alternate" type="application/rss+xml" title="Example RSS" href="http://www.example.com/feed.rss" />
def auto_discovery_link_tag(type = :rss, url_options = {}, tag_options = {})
if !(type == :rss || type == :atom) && tag_options[:type].blank?
raise ArgumentError.new("You should pass :type tag_option key explicitly, because you have passed #{type} type other than :rss or :atom.")
end
tag(
"link",
"rel" => tag_options[:rel] || "alternate",
"type" => tag_options[:type] || Mime::Type.lookup_by_extension(type.to_s).to_s,
"title" => tag_options[:title] || type.to_s.upcase,
"href" => url_options.is_a?(Hash) ? url_for(url_options.merge(:only_path => false)) : url_options
)
end
# Returns a link tag for a favicon managed by the asset pipeline.
#
# If a page has no link like the one generated by this helper, browsers
# ask for <tt>/favicon.ico</tt> automatically, and cache the file if the
# request succeeds. If the favicon changes it is hard to get it updated.
#
# To have better control applications may let the asset pipeline manage
# their favicon storing the file under <tt>app/assets/images</tt>, and
# using this helper to generate its corresponding link tag.
#
# The helper gets the name of the favicon file as first argument, which
# defaults to "favicon.ico", and also supports +:rel+ and +:type+ options
# to override their defaults, "shortcut icon" and "image/x-icon"
# respectively:
#
# favicon_link_tag
# # => <link href="/assets/favicon.ico" rel="shortcut icon" type="image/x-icon" />
#
# favicon_link_tag 'myicon.ico'
# # => <link href="/assets/myicon.ico" rel="shortcut icon" type="image/x-icon" />
#
# Mobile Safari looks for a different link tag, pointing to an image that
# will be used if you add the page to the home screen of an iOS device.
# The following call would generate such a tag:
#
# favicon_link_tag 'mb-icon.png', rel: 'apple-touch-icon', type: 'image/png'
# # => <link href="/assets/mb-icon.png" rel="apple-touch-icon" type="image/png" />
def favicon_link_tag(source='favicon.ico', options={})
tag('link', {
:rel => 'shortcut icon',
:type => 'image/x-icon',
:href => path_to_image(source)
}.merge!(options.symbolize_keys))
end
# Returns an HTML image tag for the +source+. The +source+ can be a full
# path or a file.
#
# ==== Options
#
# You can add HTML attributes using the +options+. The +options+ supports
# two additional keys for convenience and conformance:
#
# * <tt>:alt</tt> - If no alt text is given, the file name part of the
# +source+ is used (capitalized and without the extension)
# * <tt>:size</tt> - Supplied as "{Width}x{Height}" or "{Number}", so "30x45" becomes
# width="30" and height="45", and "50" becomes width="50" and height="50".
# <tt>:size</tt> will be ignored if the value is not in the correct format.
#
# ==== Examples
#
# image_tag("icon")
# # => <img alt="Icon" src="/assets/icon" />
# image_tag("icon.png")
# # => <img alt="Icon" src="/assets/icon.png" />
# image_tag("icon.png", size: "16x10", alt: "Edit Entry")
# # => <img src="/assets/icon.png" width="16" height="10" alt="Edit Entry" />
# image_tag("/icons/icon.gif", size: "16")
# # => <img src="/icons/icon.gif" width="16" height="16" alt="Icon" />
# image_tag("/icons/icon.gif", height: '32', width: '32')
# # => <img alt="Icon" height="32" src="/icons/icon.gif" width="32" />
# image_tag("/icons/icon.gif", class: "menu_icon")
# # => <img alt="Icon" class="menu_icon" src="/icons/icon.gif" />
def image_tag(source, options={})
options = options.symbolize_keys
src = options[:src] = path_to_image(source)
unless src =~ /^(?:cid|data):/ || src.blank?
options[:alt] = options.fetch(:alt){ image_alt(src) }
end
options[:width], options[:height] = extract_dimensions(options.delete(:size)) if options[:size]
tag("img", options)
end
# Returns a string suitable for an HTML image tag alt attribute.
# The +src+ argument is meant to be an image file path.
# The method removes the basename of the file path and the digest,
# if any. It also removes hyphens and underscores from file names and
# replaces them with spaces, returning a space-separated, titleized
# string.
#
# ==== Examples
#
# image_alt('rails.png')
# # => Rails
#
# image_alt('hyphenated-file-name.png')
# # => Hyphenated file name
#
# image_alt('underscored_file_name.png')
# # => Underscored file name
def image_alt(src)
File.basename(src, '.*').sub(/-[[:xdigit:]]{32,64}\z/, '').tr('-_', ' ').capitalize
end
# Returns an HTML video tag for the +sources+. If +sources+ is a string,
# a single video tag will be returned. If +sources+ is an array, a video
# tag with nested source tags for each source will be returned. The
# +sources+ can be full paths or files that exists in your public videos
# directory.
#
# ==== Options
# You can add HTML attributes using the +options+. The +options+ supports
# two additional keys for convenience and conformance:
#
# * <tt>:poster</tt> - Set an image (like a screenshot) to be shown
# before the video loads. The path is calculated like the +src+ of +image_tag+.
# * <tt>:size</tt> - Supplied as "{Width}x{Height}" or "{Number}", so "30x45" becomes
# width="30" and height="45", and "50" becomes width="50" and height="50".
# <tt>:size</tt> will be ignored if the value is not in the correct format.
#
# ==== Examples
#
# video_tag("trailer")
# # => <video src="/videos/trailer"></video>
# video_tag("trailer.ogg")
# # => <video src="/videos/trailer.ogg"></video>
# video_tag("trailer.ogg", controls: true, autobuffer: true)
# # => <video autobuffer="autobuffer" controls="controls" src="/videos/trailer.ogg" ></video>
# video_tag("trailer.m4v", size: "16x10", poster: "screenshot.png")
# # => <video src="/videos/trailer.m4v" width="16" height="10" poster="/assets/screenshot.png"></video>
# video_tag("/trailers/hd.avi", size: "16x16")
# # => <video src="/trailers/hd.avi" width="16" height="16"></video>
# video_tag("/trailers/hd.avi", size: "16")
# # => <video height="16" src="/trailers/hd.avi" width="16"></video>
# video_tag("/trailers/hd.avi", height: '32', width: '32')
# # => <video height="32" src="/trailers/hd.avi" width="32"></video>
# video_tag("trailer.ogg", "trailer.flv")
# # => <video><source src="/videos/trailer.ogg" /><source src="/videos/trailer.flv" /></video>
# video_tag(["trailer.ogg", "trailer.flv"])
# # => <video><source src="/videos/trailer.ogg" /><source src="/videos/trailer.flv" /></video>
# video_tag(["trailer.ogg", "trailer.flv"], size: "160x120")
# # => <video height="120" width="160"><source src="/videos/trailer.ogg" /><source src="/videos/trailer.flv" /></video>
def video_tag(*sources)
multiple_sources_tag('video', sources) do |options|
options[:poster] = path_to_image(options[:poster]) if options[:poster]
options[:width], options[:height] = extract_dimensions(options.delete(:size)) if options[:size]
end
end
# Returns an HTML audio tag for the +source+.
# The +source+ can be full path or file that exists in
# your public audios directory.
#
# audio_tag("sound")
# # => <audio src="/audios/sound"></audio>
# audio_tag("sound.wav")
# # => <audio src="/audios/sound.wav"></audio>
# audio_tag("sound.wav", autoplay: true, controls: true)
# # => <audio autoplay="autoplay" controls="controls" src="/audios/sound.wav"></audio>
# audio_tag("sound.wav", "sound.mid")
# # => <audio><source src="/audios/sound.wav" /><source src="/audios/sound.mid" /></audio>
def audio_tag(*sources)
multiple_sources_tag('audio', sources)
end
private
def multiple_sources_tag(type, sources)
options = sources.extract_options!.symbolize_keys
sources.flatten!
yield options if block_given?
if sources.size > 1
content_tag(type, options) do
safe_join sources.map { |source| tag("source", :src => send("path_to_#{type}", source)) }
end
else
options[:src] = send("path_to_#{type}", sources.first)
content_tag(type, nil, options)
end
end
def extract_dimensions(size)
if size =~ %r{\A\d+x\d+\z}
size.split('x')
elsif size =~ %r{\A\d+\z}
[size, size]
end
end
end
end
end