Helpers in Java

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Helpers
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1116 RecordTagHelper
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This module is closely related to RecordIdentificationHelper in that it assists in creation of HTML markup code that follows good, clean naming conventions
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content tag for(tag name, record, *args, & block)
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This helper method creates an HTML element with id and class parameters that relate to the specified Active Record object For instance, assuming @person is an instance of a Person class, with an id value of 123 then the following template code
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= content_tag_for(:tr, @person) do %td= @personfirst_name %td= @personlast_name
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11: All About Helpers
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will produce the following HTML
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<tr id="person_123" class="person"> </tr>
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If you require the HTML id attribute to have a prefix, you can specify it as a third argument:
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>> content_tag_for(:tr, @person, :foo) do => "<tr id=\"foo_person_123\" class=\"person\">"
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The content_tag_for helper also accepts a hash of options, which will be converted to additional HTML attributes on the tag If you specify a :class value, it will be combined with the default class name for your object instead of replacing it (since replacing it would defeat the purpose of the method!)
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>> content_tag_for(:tr, @person, :foo, :class => 'highlight') do => "<tr id=\"foo_person_123\" class=\"person highlight\">"
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div for(record, *args, & block)
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Produces a wrapper div element with id and class parameters that relate to the specified Active Record object This method is exactly like content_tag_for except that it s hard-coded to output div elements
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1117 SanitizeHelper
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The SanitizeHelper module provides a set of methods for scrubbing text of undesired HTML elements Rails 3 sanitizes and escapes html content by default, so this helper is really intended to assist with the inclusion of dynamic content into your views
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sanitize(html, options = {})
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Encodes all tags and strip all attributes (not specifically allowed) from the html string passed to it Also strips href and src tags with invalid protocols, particularly in an effort to to prevent abuse of javascript: attribute values
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= sanitize @articlebody
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With its default settings, the sanitize method does its best to counter known hacker tricks such as using unicode/ascii/hex values to get past the JavaScript filters You can customize the behavior of sanitize by adding or removing allowable tags and attributes using the :attributes or :tags options
= sanitize @articlebody, :tags => %w(table tr td), :attributes => %w(id class style)
1117 SanitizeHelper
It s possible to add tags to the default allowed tags in your application by altering the value of configaction_viewsanitized_allowed_tags in an initializer For instance, the following code adds support for basic HTML tables
Rails::Initializerrun do |config| configaction_viewsanitized_allowed_tags = 'table', 'tr', 'td' end
You can also remove some of the tags that are allowed by default
Rails::Initializerrun do |config| configafter_initialize do ActionView::Basesanitized_allowed_tagsdelete 'div' end end
Or change them altogether
Rails::Initializerrun do |config| configaction_viewsanitized_allowed_attributes = 'id', 'class', 'style' end
Sanitizing user-provided text does not guarantee that the resulting markup will be valid (conforming to a document type) or even well-formed The output may still contain unescaped <, >, & characters that confuse browsers and adversely affect rendering
sanitize css(style)
Sanitizes a block of CSS code Used by sanitize when it comes across a style attribute in HTML being sanitized
Helpers
strip links(html)
Strips all link tags from text leaving just the link text
strip_links('<a href="http://wwwrubyonrailsorg">Ruby on Rails</a>') => Ruby on Rails strip_links('Please email me at <a href="mailto:me@emailcom">me@emailcom</a>') => Please email me at me@emailcom strip_links('Blog: <a href="http://wwwmyblogcom/" class="nav" target=\"_blank\">Visit</a>') => Blog: Visit
11: All About Helpers
strip tags(html)
Strips all tags from the html string, including comments Its HTML parsing ability is limited by that of the html-scanner tokenizer built into Rails 7
strip_tags("Strip <i>these</i> tags!") => Strip these tags! strip_tags("<b>Bold</b> no more! <a href='morehtml'>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!
1118 TagHelper
This module provides helper methods for generating HTML tags programmatically
cdata section(content)
Returns a CDATA section wrapping the given content CDATA sections are used to escape blocks of text containing characters that would otherwise be recognized as markup CDATA sections begin with the string <![CDATA[ and end with (and may not contain) the string ]]>
content tag(name, content = nil, options = nil, & block)
Returns an HTML block tag of type name surrounding the content Add HTML attributes by passing an attributes hash as options Instead of passing the content as an argument, you can also use a block to hold additional markup (and/or additional calls to content_tag) in which case, you pass your options as the second parameter Here are some simple examples of using content_tag without a block:
>> content_tag(:p, "Hello world!") => <p>Hello world!</p> >> content_tag(:div, content_tag(:p, "Hello!"), :class => "message") => <div class="message"><p>Hello!</p></div> >> content_tag("select", options, :multiple => true) => <select multiple="multiple">options</select>
7 You can examine the source code of the html-scanner yourself by opening up actionpack/lib/