AssetTagHelper in Java

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112 AssetTagHelper
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stylesheet path(source)
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Computes the path to a stylesheet asset in the public/stylesheets directory If the source filename has no extension, css will be appended Full paths from the document root will be passed through Used internally by stylesheet_link_tag to build the stylesheet path
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1122 Asset Helpers
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This module also contains a series of helper methods that generate asset-related markup It s important to generate asset tags dynamically, because often assets are either packaged together or served up from a different server source than your regular content Asset helper methods also timestamp your asset source urls to prevent browser caching problems Courtenay says
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The image_tag method makes use of the image_path method that we just covered earlier in the chapter This helpful method determines the path to use in the tag You can call a controller image and have it work as a resource, despite the seemingly conflicting name, because for its internal use, ActionView aliases the method to path_to_image
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audio path(source)
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Computes the path to an audio asset in the public/audios directory, which you would have to add yourself to your Rails project since it s not generated by default Full paths from the document root will be passed through Used internally by audio_tag to build the audio path
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audio tag(source, options = {})
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Returns an HTML 5 audio tag based on the source argument
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audio_tag("sound") # => <audio src="/audios/sound" /> audio_tag("soundwav") # => <audio src="/audios/soundwav" /> audio_tag("soundwav", :autoplay => true, :controls => true) # => <audio autoplay="autoplay" controls="controls" src="/audios/soundwav" />
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11: All About Helpers
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image path(source)
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Computes the path to an image asset in the public/images directory Full paths from the document root (beginning with a / ) will be passed through This method is used internally by image_tag to build the image path
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image_path("editpng") # => /images/editpng image_path("icons/editpng") # => /images/icons/editpng image_path("/icons/editpng") # => /icons/editpng
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image tag(source, options = {})
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Returns an img tag for use in a template The source parameter can be a full path or a file that exists in your public images directory You can add additional arbitrary attributes to the img tag using the options parameter The following two options are treated specially:
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:alt If no alternate text is given, the filename part of the source is used, after being
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capitalized and stripping off the extension
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:size Supplied as widthxheight so "30x45" becomes the attributes width="30"
and height="45" The :size option will fail silently if the value is not in the correct format
image_tag("iconpng") # => <img src="/images/iconpng" alt="Icon" /> image_tag("iconpng", :size => "16x10", :alt => "Edit Entry") # => <img src="/images/iconpng" width="16" height="10" alt="Edit Entry" /> image_tag("/photos/dogjpg", :class => 'icon') # => <img src="/photos/icongif" alt="Dog" class="icon"/>
video path
Computes the path to an audio asset in the public/videos directory, which you would have to add yourself to your Rails project since it s not generated by default Full paths from the document root will be passed through Used internally by video_tag to build the video src path
video tag(sources, options = {})
Returns an HTML 5 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
112 AssetTagHelper
You can add normal HTML video element attributes using the options hash The
options supports two additional keys for convenience and conformance:
:poster Set an image (like a screenshot) to be shown before the video loads The path
is calculated using image_path
:size Supplied as widthxheight in the same manner as image_tag
video_tag("trailer") # => <video src="/videos/trailer" /> video_tag("trailerogg") # => <video src="/videos/trailerogg" /> video_tag("trailogg", :controls => true, :autobuffer => true) <video autobuffer="autobuffer" controls="controls" src="/videos/trailogg" /> # =>
video_tag("trailm4v", :size => "16x10", :poster => "screenshotpng") # => <video src="/videos/trailerm4v" width="16" height="10" poster="/images/screenshotpng" /> video_tag(["trailerogg", "trailerflv"]) # => <video> <source src="trailerogg"/> <source src="trailerflv"/> </video>
1123 Using Asset Hosts
By default, Rails links to assets on the current host in the public folder, but you can direct Rails to link to assets from a dedicated asset server by setting ActionController::Baseasset_host in a configuration file, typically in config/environments/productionrb so that it doesn t affect your development environment For example, you d define assetsexamplecom to be your asset host this way:
configaction_controllerasset_host = "assetsexamplecom"