# module ActionView::Helpers::SanitizeHelper

The SanitizeHelper module provides a set of methods for scrubbing text of undesired HTML elements. These helper methods extend Action View making them callable within your template files.

### Public Instance Methods

sanitize(html, options = {}) click to toggle source

This `sanitize` helper will html encode all tags and strip all attributes that aren’t specifically allowed.

It also strips href/src tags with invalid protocols, like javascript: especially. It does its best to counter any tricks that hackers may use, like throwing in unicode/ascii/hex values to get past the javascript: filters. Check out the extensive test suite.

    <%= sanitize @article.body %>

You can add or remove tags/attributes if you want to customize it a bit. See ActionView::Base for full docs on the available options. You can add tags/attributes for single uses of `sanitize` by passing either the `:attributes` or `:tags` options:

Normal Use

    <%= sanitize @article.body %>

Custom Use (only the mentioned tags and attributes are allowed, nothing else)

    <%= sanitize @article.body, :tags => %w(table tr td), :attributes => %w(id class style) %>

Add table tags to the default allowed tags

    class Application < Rails::Application
      config.action_view.sanitized_allowed_tags = 'table', 'tr', 'td'
    end

Remove tags to the default allowed tags

    class Application < Rails::Application
      config.after_initialize do
        ActionView::Base.sanitized_allowed_tags.delete 'div'
      end
    end

Change allowed default attributes

    class Application < Rails::Application
      config.action_view.sanitized_allowed_attributes = 'id', 'class', 'style'
    end

Please note that sanitizing user-provided text does not guarantee that the resulting markup is valid (conforming to a document type) or even well-formed. The output may still contain e.g. unescaped ‘<’, ‘>’, ‘&’ characters and confuse browsers.

    # File lib/action_view/helpers/sanitize_helper.rb, line 59
    def sanitize(html, options = {})
      self.class.white_list_sanitizer.sanitize(html, options).try(:html_safe)
    end

sanitize_css(style) click to toggle source

Sanitizes a block of CSS code. Used by `sanitize` when it comes across a style attribute.

    # File lib/action_view/helpers/sanitize_helper.rb, line 64
    def sanitize_css(style)
      self.class.white_list_sanitizer.sanitize_css(style)
    end

strip_links(html) click to toggle source

Strips all link tags from `text` leaving just the link text.

#### Examples¶ ↑

    strip_links('<a href="http://www.rubyonrails.org">Ruby on Rails</a>')
    # => Ruby on Rails

    strip_links('Please e-mail me at <a href="mailto:me@email.com">me@email.com</a>.')
    # => Please e-mail me at me@email.com.

    strip_links('Blog: <a href="http://www.myblog.com/" class="nav" target=\"_blank\">Visit</a>.')
    # => Blog: Visit.

    # File lib/action_view/helpers/sanitize_helper.rb, line 97
    def strip_links(html)
      self.class.link_sanitizer.sanitize(html)
    end

strip_tags(html) click to toggle source

Strips all HTML tags from the `html`, including comments. This uses the html-scanner tokenizer and so its HTML parsing ability is limited by that of html-scanner.

#### Examples¶ ↑

    strip_tags("Strip <i>these</i> tags!")
    # => Strip these tags!

    strip_tags("<b>Bold</b> no more!  <a href='more.html'>See more here</a>...")
    # => Bold no more!  See more here...

    strip_tags("<div id='top-bar'>Welcome to my website!</div>")
    # => Welcome to my website!

    # File lib/action_view/helpers/sanitize_helper.rb, line 82
    def strip_tags(html)
      self.class.full_sanitizer.sanitize(html)
    end