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ActionView::Helpers::TextHelper

The TextHelper module provides a set of methods for filtering, formatting and transforming strings, which can reduce the amount of inline Ruby code in your views. These helper methods extend ActionView making them callable within your template files.

Constants

AUTO_EMAIL_RE
AUTO_LINK_CRE

regexps for determining context, used high-volume

AUTO_LINK_RE
BRACKETS

Public Instance Methods

concat(string, unused_binding = nil) click to toggle source

The preferred method of outputting text in your views is to use the <%= “text” %> eRuby syntax. The regular puts and print methods do not operate as expected in an eRuby code block. If you absolutely must output text within a non-output code block (i.e., <% %>), you can use the concat method.

Examples

<%
    concat "hello"
    # is the equivalent of <%= "hello" %>

    if (logged_in == true):
      concat "Logged in!"
    else
      concat link_to('login', :action => login)
    end
    # will either display "Logged in!" or a login link
%>
# File lib/action_view/helpers/text_helper.rb, line 27
def concat(string, unused_binding = nil)
  if unused_binding
    ActiveSupport::Deprecation.warn("The binding argument of #concat is no longer needed.  Please remove it from your views and helpers.", caller)
  end

  output_buffer.safe_concat(string)
end
current_cycle(name = "default") click to toggle source

Returns the current cycle string after a cycle has been started. Useful for complex table highlighing or any other design need which requires the current cycle string in more than one place.

Example

# Alternate background colors
@items = [1,2,3,4]
<% @items.each do |item| %>
  <div style="background-color:<%= cycle("red","white","blue") %>">
    <span style="background-color:<%= current_cycle %>"><%= item %></span>
  </div>
<% end %>
# File lib/action_view/helpers/text_helper.rb, line 454
def current_cycle(name = "default")
  cycle = get_cycle(name)
  cycle.current_value unless cycle.nil?
end
cycle(first_value, *values) click to toggle source

Creates a Cycle object whose to_s method cycles through elements of an array every time it is called. This can be used for example, to alternate classes for table rows. You can use named cycles to allow nesting in loops. Passing a Hash as the last parameter with a :name key will create a named cycle. The default name for a cycle without a :name key is "default". You can manually reset a cycle by calling reset_cycle and passing the name of the cycle. The current cycle string can be obtained anytime using the current_cycle method.

Examples

 # Alternate CSS classes for even and odd numbers...
 @items = [1,2,3,4]
 <table>
 <% @items.each do |item| %>
   <tr class="<%= cycle("even", "odd") -%>">
     <td>item</td>
   </tr>
 <% end %>
 </table>

 # Cycle CSS classes for rows, and text colors for values within each row
 @items = x = [{:first => 'Robert', :middle => 'Daniel', :last => 'James'},
              {:first => 'Emily', :middle => 'Shannon', :maiden => 'Pike', :last => 'Hicks'},
             {:first => 'June', :middle => 'Dae', :last => 'Jones'}]
 <% @items.each do |item| %>
   <tr class="<%= cycle("even", "odd", :name => "row_class") -%>">
     <td>
       <% item.values.each do |value| %>
         <%# Create a named cycle "colors" %>
         <span style="color:<%= cycle("red", "green", "blue", :name => "colors") -%>">
           <%= value %>
         </span>
       <% end %>
       <% reset_cycle("colors") %>
     </td>
  </tr>
<% end %>
# File lib/action_view/helpers/text_helper.rb, line 426
def cycle(first_value, *values)
  if (values.last.instance_of? Hash)
    params = values.pop
    name = params[:name]
  else
    name = "default"
  end
  values.unshift(first_value)

  cycle = get_cycle(name)
  if (cycle.nil? || cycle.values != values)
    cycle = set_cycle(name, Cycle.new(*values))
  end
  return cycle.to_s
end
excerpt(text, phrase, *args) click to toggle source

Extracts an excerpt from text that matches the first instance of phrase. The :radius option expands the excerpt on each side of the first occurrence of phrase by the number of characters defined in :radius (which defaults to 100). If the excerpt radius overflows the beginning or end of the text, then the :omission option (which defaults to “…”) will be prepended/appended accordingly. The resulting string will be stripped in any case. If the phrase isn’t found, nil is returned.

Examples

excerpt('This is an example', 'an', :radius => 5)
# => ...s is an exam...

excerpt('This is an example', 'is', :radius => 5)
# => This is a...

excerpt('This is an example', 'is')
# => This is an example

excerpt('This next thing is an example', 'ex', :radius => 2)
# => ...next...

excerpt('This is also an example', 'an', :radius => 8, :omission => '<chop> ')
# => <chop> is also an example

You can still use excerpt with the old API that accepts the radius as its optional third and the ellipsis as its optional forth parameter:

excerpt('This is an example', 'an', 5)                   # => ...s is an exam...
excerpt('This is also an example', 'an', 8, '<chop> ')   # => <chop> is also an example
# File lib/action_view/helpers/text_helper.rb, line 142
def excerpt(text, phrase, *args)
  options = args.extract_options!
  unless args.empty?
    options[:radius] = args[0] || 100
    options[:omission] = args[1] || "..."
  end
  options.reverse_merge!(:radius => 100, :omission => "...")

  if text && phrase
    phrase = Regexp.escape(phrase)

    if found_pos = text.mb_chars =~ /(#{phrase})/
      start_pos = [ found_pos - options[:radius], 0 ].max
      end_pos   = [ [ found_pos + phrase.mb_chars.length + options[:radius] - 1, 0].max, text.mb_chars.length ].min

      prefix  = start_pos > 0 ? options[:omission] : ""
      postfix = end_pos < text.mb_chars.length - 1 ? options[:omission] : ""

      prefix + text.mb_chars[start_pos..end_pos].strip + postfix
    else
      nil
    end
  end
end
highlight(text, phrases, *args) click to toggle source

Highlights one or more phrases everywhere in text by inserting it into a :highlighter string. The highlighter can be specialized by passing :highlighter as a single-quoted string with 1 where the phrase is to be inserted (defaults to ‘<strong class=“highlight”>1</strong>’)

Examples

highlight('You searched for: rails', 'rails')
# => You searched for: <strong class="highlight">rails</strong>

highlight('You searched for: ruby, rails, dhh', 'actionpack')
# => You searched for: ruby, rails, dhh

highlight('You searched for: rails', ['for', 'rails'], :highlighter => '<em>\1</em>')
# => You searched <em>for</em>: <em>rails</em>

highlight('You searched for: rails', 'rails', :highlighter => '<a href="search?q=\1">\1</a>')
# => You searched for: <a href="search?q=rails">rails</a>

You can still use highlight with the old API that accepts the highlighter as its optional third parameter:

highlight('You searched for: rails', 'rails', '<a href="search?q=\1">\1</a>')     # => You searched for: <a href="search?q=rails">rails</a>
# File lib/action_view/helpers/text_helper.rb, line 100
def highlight(text, phrases, *args)
  options = args.extract_options!
  unless args.empty?
    options[:highlighter] = args[0] || '<strong class="highlight">\1</strong>'
  end
  options.reverse_merge!(:highlighter => '<strong class="highlight">\1</strong>')

  if text.blank? || phrases.blank?
    text
  else
    match = Array(phrases).map { |p| Regexp.escape(p) }.join('|')
    text.gsub(/(#{match})(?!(?:[^<]*?)(?:["'])[^<>]*>)/, options[:highlighter])
  end
end
markdown(text) click to toggle source

Returns the text with all the Markdown codes turned into HTML tags. This method requires BlueCloth or another Markdown library to be installed..

Examples

markdown("We are using __Markdown__ now!")
# => "<p>We are using <strong>Markdown</strong> now!</p>"

markdown("We like to _write_ `code`, not just _read_ it!")
# => "<p>We like to <em>write</em> <code>code</code>, not just <em>read</em> it!</p>"

markdown("The [Markdown website](http://daringfireball.net/projects/markdown/) has more information.")
# => "<p>The <a href="http://daringfireball.net/projects/markdown/">Markdown website</a>
#     has more information.</p>"

markdown('![The ROR logo](http://rubyonrails.com/images/rails.png "Ruby on Rails")')
# => '<p><img src="http://rubyonrails.com/images/rails.png" alt="The ROR logo" title="Ruby on Rails" /></p>'
# File lib/action_view/helpers/text_helper.rb, line 299
def markdown(text)
  text.blank? ? "" : Markdown.new(text).to_html
end
pluralize(count, singular, plural = nil) click to toggle source

Attempts to pluralize the singular word unless count is 1. If plural is supplied, it will use that when count is > 1, otherwise it will use the Inflector to determine the plural form

Examples

pluralize(1, 'person')
# => 1 person

pluralize(2, 'person')
# => 2 people

pluralize(3, 'person', 'users')
# => 3 users

pluralize(0, 'person')
# => 0 people
# File lib/action_view/helpers/text_helper.rb, line 183
def pluralize(count, singular, plural = nil)
  "#{count || 0} " + ((count == 1 || count =~ /^1(\.0+)?$/) ? singular : (plural || singular.pluralize))
end
reset_cycle(name = "default") click to toggle source

Resets a cycle so that it starts from the first element the next time it is called. Pass in name to reset a named cycle.

Example

# Alternate CSS classes for even and odd numbers...
@items = [[1,2,3,4], [5,6,3], [3,4,5,6,7,4]]
<table>
<% @items.each do |item| %>
  <tr class="<%= cycle("even", "odd") -%>">
      <% item.each do |value| %>
        <span style="color:<%= cycle("#333", "#666", "#999", :name => "colors") -%>">
          <%= value %>
        </span>
      <% end %>

      <% reset_cycle("colors") %>
  </tr>
<% end %>
</table>
# File lib/action_view/helpers/text_helper.rb, line 478
def reset_cycle(name = "default")
  cycle = get_cycle(name)
  cycle.reset unless cycle.nil?
end
simple_format(text, html_options={}) click to toggle source

Returns text transformed into HTML using simple formatting rules. Two or more consecutive newlines(\n\n) are considered as a paragraph and wrapped in <p> tags. One newline (\n) is considered as a linebreak and a <br /> tag is appended. This method does not remove the newlines from the text.

You can pass any HTML attributes into html_options. These will be added to all created paragraphs.

Examples

my_text = "Here is some basic text...\n...with a line break."

simple_format(my_text)
# => "<p>Here is some basic text...\n<br />...with a line break.</p>"

more_text = "We want to put a paragraph...\n\n...right there."

simple_format(more_text)
# => "<p>We want to put a paragraph...</p>\n\n<p>...right there.</p>"

simple_format("Look ma! A class!", :class => 'description')
# => "<p class='description'>Look ma! A class!</p>"
# File lib/action_view/helpers/text_helper.rb, line 324
def simple_format(text, html_options={})
  start_tag = tag('p', html_options, true)
  text = text.to_s.dup
  text.gsub!(/\r\n?/, "\n")                    # \r\n and \r -> \n
  text.gsub!(/\n\n+/, "</p>\n\n#{start_tag}")  # 2+ newline  -> paragraph
  text.gsub!(/([^\n]\n)(?=[^\n])/, '\1<br />') # 1 newline   -> br
  text.insert 0, start_tag
  text.html_safe.safe_concat("</p>")
end
textilize(text, *options) click to toggle source

Returns the text with all the Textile codes turned into HTML tags.

You can learn more about Textile’s syntax at its website. This method is only available if RedCloth is available.

Examples

textilize("*This is Textile!*  Rejoice!")
# => "<p><strong>This is Textile!</strong>  Rejoice!</p>"

textilize("I _love_ ROR(Ruby on Rails)!")
# => "<p>I <em>love</em> <acronym title="Ruby on Rails">ROR</acronym>!</p>"

textilize("h2. Textile makes markup -easy- simple!")
# => "<h2>Textile makes markup <del>easy</del> simple!</h2>"

textilize("Visit the Rails website "here":http://www.rubyonrails.org/.)
# => "<p>Visit the Rails website <a href="http://www.rubyonrails.org/">here</a>.</p>"

textilize("This is worded <strong>strongly</strong>")
# => "<p>This is worded <strong>strongly</strong></p>"

textilize("This is worded <strong>strongly</strong>", :filter_html)
# => "<p>This is worded &lt;strong&gt;strongly&lt;/strong&gt;</p>"
# File lib/action_view/helpers/text_helper.rb, line 245
def textilize(text, *options)
  options ||= [:hard_breaks]

  if text.blank?
    ""
  else
    textilized = RedCloth.new(text, options)
    textilized.to_html
  end
end
textilize_without_paragraph(text) click to toggle source

Returns the text with all the Textile codes turned into HTML tags, but without the bounding <p> tag that RedCloth adds.

You can learn more about Textile’s syntax at its website. This method is requires RedCloth to be available.

Examples

textilize_without_paragraph("*This is Textile!*  Rejoice!")
# => "<strong>This is Textile!</strong>  Rejoice!"

textilize_without_paragraph("I _love_ ROR(Ruby on Rails)!")
# => "I <em>love</em> <acronym title="Ruby on Rails">ROR</acronym>!"

textilize_without_paragraph("h2. Textile makes markup -easy- simple!")
# => "<h2>Textile makes markup <del>easy</del> simple!</h2>"

textilize_without_paragraph("Visit the Rails website "here":http://www.rubyonrails.org/.)
# => "Visit the Rails website <a href="http://www.rubyonrails.org/">here</a>."
# File lib/action_view/helpers/text_helper.rb, line 275
def textilize_without_paragraph(text)
  textiled = textilize(text)
  if textiled[0..2] == "<p>" then textiled = textiled[3..-1] end
  if textiled[-4..-1] == "</p>" then textiled = textiled[0..-5] end
  return textiled
end
truncate(text, *args) click to toggle source

Truncates a given text after a given :length if text is longer than :length (defaults to 30). The last characters will be replaced with the :omission (defaults to “…”) for a total length not exceeding :length.

Examples

truncate("Once upon a time in a world far far away")
# => Once upon a time in a world...

truncate("Once upon a time in a world far far away", :length => 14)
# => Once upon a...

truncate("And they found that many people were sleeping better.", :length => 25, "(clipped)")
# => And they found t(clipped)

truncate("And they found that many people were sleeping better.", :omission => "... (continued)", :length => 25)
# => And they f... (continued)

You can still use truncate with the old API that accepts the length as its optional second and the ellipsis as its optional third parameter:

truncate("Once upon a time in a world far far away", 14)
# => Once upon a...

truncate("And they found that many people were sleeping better.", 25, "... (continued)")
# => And they f... (continued)
# File lib/action_view/helpers/text_helper.rb, line 61
def truncate(text, *args)
  options = args.extract_options!
  unless args.empty?
    ActiveSupport::Deprecation.warn('truncate takes an option hash instead of separate ' +
      'length and omission arguments', caller)

    options[:length] = args[0] || 30
    options[:omission] = args[1] || "..."
  end
  options.reverse_merge!(:length => 30, :omission => "...")

  if text
    l = options[:length] - options[:omission].mb_chars.length
    chars = text.mb_chars
    (chars.length > options[:length] ? chars[0...l] + options[:omission] : text).to_s
  end
end
word_wrap(text, *args) click to toggle source

Wraps the text into lines no longer than line_width width. This method breaks on the first whitespace character that does not exceed line_width (which is 80 by default).

Examples

word_wrap('Once upon a time')
# => Once upon a time

word_wrap('Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding a successor to the throne turned out to be more trouble than anyone could have imagined...')
# => Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding\n a successor to the throne turned out to be more trouble than anyone could have\n imagined...

word_wrap('Once upon a time', :line_width => 8)
# => Once upon\na time

word_wrap('Once upon a time', :line_width => 1)
# => Once\nupon\na\ntime

You can still use word_wrap with the old API that accepts the line_width as its optional second parameter:

word_wrap('Once upon a time', 8)     # => Once upon\na time
# File lib/action_view/helpers/text_helper.rb, line 208
def word_wrap(text, *args)
  options = args.extract_options!
  unless args.blank?
    options[:line_width] = args[0] || 80
  end
  options.reverse_merge!(:line_width => 80)

  text.split("\n").collect do |line|
    line.length > options[:line_width] ? line.gsub(/(.{1,#{options[:line_width]}})(\s+|$)/, "\\1\n").strip : line
  end * "\n"
end

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