Rails - Jun 2008 - display "..." for text LONER than a certain length...

I am working on an app that has user generated content. What I''d like
to do, is display X characters of, say, a title and put "..." for the
rest. This sounds like something you see in soc networking type app
and wondering if there is some code out there to do this. thanks.
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<%= h truncate( model.property, X ) %>

On Mon, Jun 9, 2008 at 5:16 AM, nahabed
<roupenn-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> I am working on an app that has user generated content. What I''d
like
> to do, is display X characters of, say, a title and put "..." for
the
> rest. This sounds like something you see in soc networking type app
> and wondering if there is some code out there to do this. thanks.
> >
>

-- 
xucros.com

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Nahabed,
Just in case you didn''t follow Lucas''s explanation the
''X'' is the
length you wish to display on the form.
Kathleen

On Jun 9, 2:28 am, Lucas
<lucas.uy...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> <%= h truncate( model.property, X ) %>
>
> On Mon, Jun 9, 2008 at 5:16 AM, nahabed
<roup...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > I am working on an app that has user generated content. What
I''d like
> > to do, is display X characters of, say, a title and put
"..." for the
> > rest. This sounds like something you see in soc networking type app
> > and wondering if there is some code out there to do this. thanks.
>
> --
> xucros.com
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Lucas wrote:
> <%= h truncate( model.property, X ) %>
Hey, I''ve just got a quick question on this (I''ve run into
needing this
same thing, but I''ve done it a different way).  Say I want to limit 
something to 50 characters before cutting it off and adding the "...".
If it turns out that whatever I want to limit ends up only being 30 
characters, will it still add the "..."?  I''d assume it
wouldn''t,
because Rails is usually smarter than that, but its good to check before 
I go changing my app to use this method (which is way better than how 
I''ve been doing it) :)
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@Dan, in short, rails is smart enough. See
http://api.rubyonrails.org/classes/ActionView/Helpers/TextHelper.html#M001049

On Jun 9, 8:34 am, Dan __
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Lucas wrote:
> > <%= h truncate( model.property, X ) %>
>
> Hey, I''ve just got a quick question on this (I''ve run
into needing this
> same thing, but I''ve done it a different way).  Say I want to
limit
> something to 50 characters before cutting it off and adding the
"...".
> If it turns out that whatever I want to limit ends up only being 30
> characters, will it still add the "..."?  I''d assume it
wouldn''t,
> because Rails is usually smarter than that, but its good to check before
> I go changing my app to use this method (which is way better than how
> I''ve been doing it) :)
> --
> Posted viahttp://www.ruby-forum.com/.
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Dan __ wrote:
> Lucas wrote:
>> <%= h truncate( model.property, X ) %>
> 
> Hey, I''ve just got a quick question on this (I''ve run
into needing this
> same thing, but I''ve done it a different way).  Say I want to
limit
> something to 50 characters before cutting it off and adding the
"...".
> If it turns out that whatever I want to limit ends up only being 30 
> characters, will it still add the "..."?  I''d assume it
wouldn''t,
> because Rails is usually smarter than that, but its good to check before 
> I go changing my app to use this method (which is way better than how 
> I''ve been doing it) :)
(model.property.length > X ? truncate(model.property,
X-3)+''...'' :
model.property)

or something like that...
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DyingToLearn wrote:
> @Dan, in short, rails is smart enough. See
>
http://api.rubyonrails.org/classes/ActionView/Helpers/TextHelper.html#M001049
Beautiful!  Simplifies my code a decent amount (gets rid of the if 
statements I had before to do the same job).  Thanks a bunch :)
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> (model.property.length > X ? truncate(model.property,
X-3)+''...'' :
> model.property)
Doh! Ignore that... truncate... Nice.
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Quoting nahabed
<roupenn-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> 
> I am working on an app that has user generated content. What I''d
like
> to do, is display X characters of, say, a title and put "..." for
the
> rest. This sounds like something you see in soc networking type app
> and wondering if there is some code out there to do this. thanks.
  # truncate a string to N characters, add elipsis if over
  def short_desc(s, n=80)
    if s.nil?
      ''''
    elsif s.length <= n
      s
    else
      i = n - 4		# 4 characters in ellipsis
      while i > 0 && " \t".include?(s[i])	# is whitespace?
	i = i - 1
      end
      if i <= 0
	s
      else
	s.slice(0, i) + '' ...''
      end
    end
  end


HTH,
  Jeffrey

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I was under the impression that''s what truncate did, Jeffrey.

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hi

I guess u want to do something like this

some text upto say 30 char and after that ... so u can restrict just by 
doing

 <%= t.content[0..30]%>...

Thanks

Dhaval Parikh
Software Engineer
www.railshouse.com
sales(AT)railshouse(DOT)com
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My bad.  Made an improvement without verifying the result.  Corrected line
below uncommented.

Sorry,
  Jeffrey

Quoting Jeffrey L. Taylor
<ror-f/t7CGFWhwGcvWdFBKKxig@public.gmane.org>:
> Quoting nahabed <roupenn-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> > 
> > I am working on an app that has user generated content. What
I''d like
> > to do, is display X characters of, say, a title and put
"..." for the
> > rest. This sounds like something you see in soc networking type app
> > and wondering if there is some code out there to do this. thanks.
> 
>   # truncate a string to N characters, add elipsis if over
>   def short_desc(s, n=80)
>     if s.nil?
>       ''''
>     elsif s.length <= n
>       s
>     else
>       i = n - 4		# 4 characters in ellipsis
>       while i > 0 && " \t".include?(s[i])	# is
whitespace?
       while i > 0 && !" \t".include?(s[i])	# is not
whitespace?
> 	i = i - 1
>       end
>       if i <= 0
> 	s
>       else
> 	s.slice(0, i) + '' ...''
>       end
>     end
>   end
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Quoting Ryan Bigg (Radar)
<radarlistener-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> I was under the impression that''s what truncate did, Jeffrey.
> 
No, truncate just chops it off at N characters, possibly in mid-word.  My code
truncates at whitespace, i.e., between words.  (Or at least it does after the
correction I just posted.)

Jeffrey

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On Jun 13, 2008, at 12:36 PM, Jeffrey L. Taylor wrote:
> Quoting Ryan Bigg (Radar)
<radarlistener-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
>> I was under the impression that''s what truncate did, Jeffrey.
>
> No, truncate just chops it off at N characters, possibly in mid- 
> word.  My code
> truncates at whitespace, i.e., between words.  (Or at least it does  
> after the
> correction I just posted.)
>
> Jeffrey

You really, REALLY ought to have tests for this:

class TruncateTest < Test::Unit::TestCase
   def test_fits
     str = "short"
     assert_equal str, truncate(str, 10)
   end

   def test_backs_up_to_space
     str = "short filibuster"
     exp = "short ..."
     assert_equal exp, truncate(str, 10)
   end

   def test_breaks_word_if_no_space
     str = "antidisestablishmentarianism"
     exp = "antidis..."
     assert_equal exp, truncate(str, 10)
   end

end

I didn''t look back at your code so these tests might not actually be  
the results that you want, but this ought to give you the right idea.

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org



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Shorter, faster version

  # truncate a string to N characters, add elipsis if over
  def short_desc(s, n=80)
    if s.nil?
      ''''
    elsif s.length <= n
      s
    else
      # find last break character (space, tab, hyphen, slash, underscore)
      i = s.rindex(/[ \t-\/_]/, n)
      i = n - 4 if i.nil?	# none, just truncate()
      s.slice(0, i+1) + ''...''
    end
  end

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Quoting Rob Biedenharn
<Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org>:
> 
> On Jun 13, 2008, at 12:36 PM, Jeffrey L. Taylor wrote:
> > Quoting Ryan Bigg (Radar)
<radarlistener-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> >> I was under the impression that''s what truncate did,
Jeffrey.
> >
> > No, truncate just chops it off at N characters, possibly in mid- 
> > word.  My code
> > truncates at whitespace, i.e., between words.  (Or at least it does  
> > after the
> > correction I just posted.)
> >
> > Jeffrey
> 
> 
> You really, REALLY ought to have tests for this:
> 
> class TruncateTest < Test::Unit::TestCase
>    def test_fits
>      str = "short"
>      assert_equal str, truncate(str, 10)
>    end
> 
>    def test_backs_up_to_space
>      str = "short filibuster"
>      exp = "short ..."
>      assert_equal exp, truncate(str, 10)
>    end
> 
>    def test_breaks_word_if_no_space
>      str = "antidisestablishmentarianism"
>      exp = "antidis..."
>      assert_equal exp, truncate(str, 10)
>    end
> 
> end
> 
> I didn''t look back at your code so these tests might not actually
be
> the results that you want, but this ought to give you the right idea.
> 
It''s added to the TODO list.  I''ll start with your examples.

Thanks,
  Jeffrey

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Quoting Jeffrey L. Taylor <ror-f/t7CGFWhwGcvWdFBKKxig@public.gmane.org>:
[snip]
> It''s added to the TODO list.  I''ll start with your
examples.
> 

Done.

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