Provides methods to generate HTML tags programmatically when you can’t use a Builder. By default, they output XHTML compliant tags.
Returns a CDATA section with the given content
. CDATA
sections are used to escape blocks of text containing characters which
would otherwise be recognized as markup. CDATA sections begin with the
string <![CDATA[
and end with (and may not contain) the
string ]]>
.
cdata_section("<hello world>") # => <![CDATA[<hello world>]]> cdata_section(File.read("hello_world.txt")) # => <![CDATA[<hello from a text file]]>
# File lib/action_view/helpers/tag_helper.rb, line 94 def cdata_section(content) "<![CDATA[#{content}]]>".html_safe end
Returns an HTML block tag of type
name
surrounding the content
. Add HTML attributes by passing an attributes hash to
options
. Instead of passing the content as an argument, you
can also use a block in which case, you pass your options
as
the second parameter. Set escape to false to disable attribute value
escaping.
The options
hash is used with attributes with no value like
(disabled
and readonly
), which you can give a
value of true in the options
hash. You can use symbols or
strings for the attribute names.
content_tag(:p, "Hello world!") # => <p>Hello world!</p> content_tag(:div, content_tag(:p, "Hello world!"), :class => "strong") # => <div class="strong"><p>Hello world!</p></div> content_tag("select", options, :multiple => true) # => <select multiple="multiple">...options...</select> <%= content_tag :div, :class => "strong" do -%> Hello world! <% end -%> # => <div class="strong">Hello world!</div>
# File lib/action_view/helpers/tag_helper.rb, line 74 def content_tag(name, content_or_options_with_block = nil, options = nil, escape = true, &block) if block_given? options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash) content_tag_string(name, capture(&block), options, escape) else content_tag_string(name, content_or_options_with_block, options, escape) end end
Returns an escaped version of html
without affecting existing
escaped entities.
escape_once("1 < 2 & 3") # => "1 < 2 & 3" escape_once("<< Accept & Checkout") # => "<< Accept & Checkout"
# File lib/action_view/helpers/tag_helper.rb, line 106 def escape_once(html) ActiveSupport::Multibyte.clean(html.to_s).gsub(%r[\"><]|&(?!([a-zA-Z]+|(#\d+));)/) { |special| ERB::Util::HTML_ESCAPE[special] } end
Returns an empty HTML tag of type
name
which by default is XHTML compliant. Set
open
to true to create an open tag compatible with HTML 4.0 and below. Add HTML attributes by passing an attributes hash to
options
. Set escape
to false to disable attribute
value escaping.
The options
hash is used with attributes with no value like
(disabled
and readonly
), which you can give a
value of true in the options
hash. You can use symbols or
strings for the attribute names.
tag("br") # => <br /> tag("br", nil, true) # => <br> tag("input", { :type => 'text', :disabled => true }) # => <input type="text" disabled="disabled" /> tag("img", { :src => "open & shut.png" }) # => <img src="open & shut.png" /> tag("img", { :src => "open & shut.png" }, false, false) # => <img src="open & shut.png" />
# File lib/action_view/helpers/tag_helper.rb, line 47 def tag(name, options = nil, open = false, escape = true) "<#{name}#{tag_options(options, escape) if options}#{open ? ">" : " />"}".html_safe end