Module: ActionView::Helpers::AssetTagHelper

Defined in:
lib/action_view/helpers/asset_tag_helper.rb

Overview

Provides methods for linking a HTML page together with other assets, such as javascripts, stylesheets, and feeds.

Instance Method Summary collapse

Instance Method Details

Returns a link tag that browsers and news readers can use to auto-detect a RSS or ATOM feed for this page. The type can either be :rss (default) or :atom and the options follow the url_for style of declaring a link target.

Examples:

auto_discovery_link_tag # =>
  <link rel="alternate" type="application/rss+xml" title="RSS" href="http://www.curenthost.com/controller/action" />
auto_discovery_link_tag(:atom) # =>
  <link rel="alternate" type="application/atom+xml" title="ATOM" href="http://www.curenthost.com/controller/action" />
auto_discovery_link_tag(:rss, :action => "feed") # =>
  <link rel="alternate" type="application/atom+xml" title="ATOM" href="http://www.curenthost.com/controller/feed" />



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# File 'lib/action_view/helpers/asset_tag_helper.rb', line 19

def auto_discovery_link_tag(type = :rss, options = {})
  tag(
    "link", "rel" => "alternate", "type" => "application/#{type}+xml", "title" => type.to_s.upcase,
    "href" => url_for(options.merge(:only_path => false))
  )
end

#image_tag(source, options = {}) ⇒ Object

Returns an image tag converting the options instead html options on the tag, but with these special cases:

  • :alt - If no alt text is given, the file name part of the src is used (capitalized and without the extension)

  • :size - Supplied as “XxY”, so “30x45” becomes width=“30” and height=“45”

The src can be supplied as a…

  • full path, like “/my_images/image.gif”

  • file name, like “rss.gif”, that gets expanded to “/images/rss.gif”

  • file name without extension, like “logo”, that gets expanded to “/images/logo.png”



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# File 'lib/action_view/helpers/asset_tag_helper.rb', line 65

def image_tag(source, options = {})
  options.symbolize_keys
          
  options[:src] = compute_public_path(source, 'images', 'png')
  options[:alt] ||= source.split("/").last.split(".").first.capitalize
  
  if options[:size]
    options[:width], options[:height] = options[:size].split("x")
    options.delete :size
  end

  tag("img", options)
end

#javascript_include_tag(*sources) ⇒ Object

Returns a script include tag per source given as argument. Examples:

javascript_include_tag "xmlhr" # =>
  <script language="JavaScript" type="text/javascript" src="/javascripts/xmlhr.js"></script>

javascript_include_tag "common.javascript", "/elsewhere/cools" # =>
  <script language="JavaScript" type="text/javascript" src="/javascripts/common.javascript"></script>
  <script language="JavaScript" type="text/javascript" src="/elsewhere/cools.js"></script>



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# File 'lib/action_view/helpers/asset_tag_helper.rb', line 34

def javascript_include_tag(*sources)
  sources.collect { |source|
    source = compute_public_path(source, 'javascripts', 'js')        
    content_tag("script", "", "language" => "JavaScript", "type" => "text/javascript", "src" => source)
  }.join("\n")
end

#stylesheet_link_tag(*sources) ⇒ Object

Returns a css link tag per source given as argument. Examples:

stylesheet_link_tag "style" # =>
  <link href="/stylesheets/style.css" media="screen" rel="Stylesheet" type="text/css" />

stylesheet_link_tag "random.styles", "/css/stylish" # =>
  <link href="/stylesheets/random.styles" media="screen" rel="Stylesheet" type="text/css" />
  <link href="/css/stylish.css" media="screen" rel="Stylesheet" type="text/css" />



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# File 'lib/action_view/helpers/asset_tag_helper.rb', line 49

def stylesheet_link_tag(*sources)
  sources.collect { |source|
    source = compute_public_path(source, 'stylesheets', 'css')
    tag("link", "rel" => "Stylesheet", "type" => "text/css", "media" => "screen", "href" => source)
  }.join("\n")
end