How do I encode decode HTML entities in Ruby

Question

I am trying to decode some HTML entities  such as   amp amp lt   becoming   lt     I have an old gem  html helpers  but it seems to have been abandoned twice   Any recommendations  I will need to use it in a model

User · Answer

I think Nokogiri gem is also a good choice. It is very stable and has a huge contributing community.

Samples:

a = Nokogiri::HTML.parse "foo&nbsp;b&auml;r"    
a.text 
=> "foo bär"

or

a = Nokogiri::HTML.parse "&iexcl;I&#39;m highly&nbsp;annoyed with character references!"
a.text
=> "¡I'm highly annoyed with character references!"

User · Answer

To encode the characters  you can use CGI escapeHTML   string   CGI escapeHTML  test  escaping   lt characters gt      To decode them  there is CGI unescapeHTML   CGI unescapeHTML  test  amp quot unescaping amp quot   amp lt characters amp gt      Of course  before that you need to include the CGI library   require  cgi    And if you re in Rails  you don t need to use CGI to encode the string  There s the h method    lt    h  escaping  lt html gt     gt

User · Answer

lt   str   lt h1 gt  Test  lt  h1 gt     gt   result   amp lt  h1  amp gt  Test  amp lt   h1  amp gt    lt    CGI unescapeHTML str  html safe   gt

User · Answer

HTMLEntities can do it     jmglov laurana  sudo gem install htmlentities Successfully installed htmlentities-4 2 4   jmglov laurana   irb irb main  001 0 gt  require  htmlentities    gt     irb main  002 0 gt  HTMLEntities new decode   amp iexcl I amp  39 m highly amp nbsp annoyed with character references     gt     I m highly  annoyed with character references

User · Answer

To decode characters in Rails use    lt    raw   lt html gt     gt    So     lt    raw   amp lt br amp gt     gt    would output   lt br gt

User · Answer

You can use htmlascii gem   Htmlascii convert string

User · Answer

If you don t want to add a new dependency just to do this  like HTMLEntities  and you re already using Hpricot  it can both escape and unescape for you  It handles much more than CGI   Hpricot uxs  foo amp nbsp b amp auml r    gt   foo  b  r

[html] How do I encode/decode HTML entities in Ruby?

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