3 ways-to-create-sprites-in-rails

3 Ways to Create CSS Sprites With Rails

What Are Image Sprites?

A great way to save HTTP requests.

In other words: Something that makes your website faster. awes om e!

Rails 3.1 > Integrated Spriting CSS_Sprite > better <img> Lemonade > Full CSS sprites

Finding Information http://www.drdobbs.com/blog/archives/2010/06/preparing_for_r.html

Few Information http://blog.endpoint.com/2010/06/rails-3-at-railsconf-2010-code-goodness.html

A Piece of Code http://twitter.com/jsiarto/status/15861245321

Finally! http://www.rubyinside.com/dhhs-railsconf-2010-keynote-video-a-justification-of-rails-3-0-3325.html

Generation Sprites <%= sprite_css("icons") %> ★ Combines all images of a folder ★ Generates CSS

Using Images <%= sprite_tag("icons/trash") %> ★ Adds a HTML tag with the class (I guess it works this way.)

Questions ★ Is it possible to pack CSS files? ★ Why “icons/trash” if image_tag requires “icons/trash.png”? ★ When will it be available?

Rails 3.1 > Integrated Spriting CSS_Sprite > better <img> Lemonade > Full CSS sprites

gem install css_sprite

Features ★ Creates sprite images ★ Creates classes for each file ★ Sass compatible ★ Rake Task for generation

From Image to CCS images under css_sprite directory class name in css_sprite css twitter_icon.png .twitter_icon facebook_icon.png .facebook_icon hotmail-logo.png .hotmail-logo gmail-logo.png .gmail-logo icons/twitter_icon.png .icons .twitter_icon widget/icons/twitter_icon.png .widget .icons .twitter_icon twitter_icon_hover.png .twitter_icon:hover twitter-icon-hover.png .twitter-icon:hover logos_hover/gmail_logo.png .logos:hover .gmail_logo logos-hover/gmail-logo.png .logos:hover .gmail-logo … … full table at http://github.com/flyerhzm/css_sprite

Built Sprites (1) rake css_sprite:build

Built Sprites (2) rake css_sprite:start

Pros ★ Easy for HTML developers ★ Easy if you’re handling <img> tag

Cons ★ A lot of CSS generated (sizes, …) ★ Additional non-semantic tags ★ Additional classes ★ Positioned background images difficult ★ RMagick ★ Rake task

Alternatives ★ http://github.com/gistinc/sprite based on css_sprite ★ http://github.com/sblackstone/auto_sprite image_tag extention + CSS classes ★ http://github.com/setepo/css-sprites image_tag extention + inline CSS

Rails 3.1 > Integrated Spriting CSS_Sprite > better <img> Lemonade > Easy Sprites

gem install lemonade

Simple Sprites .add { background: sprite-image("icons/pl.png"); } .remove { background: sprite-image("icons/rm.png"); } all icons by p.yusukekamiyamane.com (CC by 3.0)

Output .add { background: url("icons.png"); } .remove { background: url("icons.png") 0 -16px; }

Right Aligned .something { background: sprite-image("i/wide.png"); } a.next { background: yellow no-repeat sprite-image("i/n.png", 100%); padding-right: 20px; }

Result .something { background: url("i.png"); } Example link a.next { background: yellow no-repeat url("i.png") 100% -20px; padding-right: 20px; }

Empty Space .add { background: sprite-image("icons/pl.png"); } .remove { background: yellow no-repeat sprite-image("icons/rm.png"); padding: 20px; }

Could be Better .add { background: url("icons.png"); } .remove { Example link background: url("icons.png") 0 -16px; padding: 20px; }

Empty Space .add { background: sprite-image("icons/pl.png"); } .remove { background: yellow no-repeat sprite-image("icons/rm.png", 0, 0, 20px); padding: 20px; }

Just Perfect .add { background: url("icons.png"); } .remove { Example link background: url("icons.png") 0 -36px; padding: 20px; }

Sprite Generation ★ Sprite image named by directory: “icons/*.png” > “icons.png” ★ Background position added only if needed ★ Add “no-repeat” by yourself: background: sprite-image("…") no-repeat;

Any questions?

Happy forking: http://github.com/flyerhzm/css_sprite http://github.com/hagenburger/lemonade

last name first name nico@hagenburger.net e-mail twitter blog

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3 ways-to-create-sprites-in-rails

by Nico Hagenburger

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