Auto html
Rails plugin for transforming urls to appropriate resource (image, link, YouTube, Vimeo video,…). Check out the live demo.
Synopsis
auto_html plugin is the perfect choice if you don’t want to bother visitors with rich HTML editor or markup code, but you still want to allow them to embed video, images, links and more on your site, purely by pasting URL.
Let’s say you have model Comment with attribute body. Create another column in table Comments called body_html. Now have something like this:
class Comment < ActiveRecord::Base
auto_html_for :body do
html_escape
image
youtube :width => 400, :height => 250
link :target => "_blank", :rel => "nofollow"
simple_format
end
end
… and you’ll have this behaviour:
Comment.create(:body => 'Hey check out this cool video: http://www.youtube.com/watch?v=WdsGihou8J4')
=> #<Comment id: 123, body: 'Hey check out this cool video: http://www.youtube.com/watch?v=WdsGihou8J4', body_html: '<p>Hey check out this cool video: <object height="250" width="400"><param name="movie" value="http://www.youtube.com/v/WdsGihou8J4" /><param name="wmode" value="transparent" /><embed src="http://www.youtube.com/v/WdsGihou8J4" type="application/x-shockwave-flash" height="250" wmode="transparent" width="400"></embed></object></p>'>
Note that order of invoking filters is important, ie. you want html_escape as first and link amongst last, so that it doesn’t transform youtube URL to plain link.
Now all you have to do is to display it in template without escaping, since plugin took care of that:
<% for comment in @comments %>
<li><%= comment.body_html %></li>
<% end %>
If you need to display preview, no problem. Have something like this as action in your controller:
def preview
comment = Comment.new(params[:comment])
comment.auto_html_prepare
render :text => comment.body_html
end
Plugin is highly customizable, and you can easily create new filters that will transform user input any way you like. For instance, this is the image filter that comes bundled with plugin:
AutoHtml.add_filter(:image) do |text|
text.gsub(/http:\/\/.+\.(jpg|jpeg|bmp|gif|png)(\?\S+)?/i) do |match|
%|<img src="#{match}" alt=""/>|
end
end
Bundled filters
-
Big words - take big words in special tags
big_words :length => 80, :tag => “span”
-
Dailymotion
dailymotion :width => 480, :height => 360
-
Google video
google_video :width => 650, :height => 391
-
HTML escaping
html_escape
-
Image - replace image url to url with <a>
image
-
Link - replace url to url with <a>
link :target => “_blank”, :rel => “nofollow”
-
HTML White List Sanitizer
sanitize
-
Simple format
simple_format
-
Vimeo
vimeo :width => 440, :height => 248, :show_title => false, :fullscreen => true, :show_byline => false, :show_portrait => false
-
Youtube
youtube :width => 390, :height => 250
youtube_js_api :width => 390, :height => 250
Install
gem 'auto_html', :git => 'git://github.com/galetahub/auto_html.git'
Links:
Credits
- Author
- Contributor