Helpers in Java

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Helpers
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Many people have suggested that it would have been a much better default solution to simply add a field_with_errors CSS class to the input tag itself, instead of wrapping it with an extra div tag Indeed, that would have made many of our lives easier, since an extra div often breaks pixel-perfect layouts However, since html_tag is already constructed at the time when the field_error_proc is invoked, it is not trivial to modify its contents There are some solutions out there that use regular expressions and modify the html_tag string, for instance this one, found at http://snippetsdzonecom/tag/ field_error_proc:
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ActionView::Basefield_error_proc = Procnew do |html_tag, instance| error_style = "background-color: #ffff80" if html_tag =~ /<(input|textarea|select)[^>]+style=/
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11: All About Helpers
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style_attribute = html_tag =~ /style=['"]/ html_taginsert(style_attribute + 7, "#{error_style}; ") elsif html_tag =~ /<(input|textarea|select)/ first_whitespace = html_tag =~ /\s/ html_tag[first_whitespace] = " style='#{error_style}' " end html_tag end
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Ugly! This is certainly an area of Action View that could use improvement
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112 AssetTagHelper
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According to the Rails API docs, this module
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Provides methods for linking an HTML page together with other assets such as images, javascripts, stylesheets, and feeds You can direct Rails to link to assets from a dedicated assets server by setting ActionController::Baseasset_host in your environmentrb These methods do not verify the assets exist before linking to them
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The AssetTagHelper module includes some methods that you will use on a daily basis during active Rails development, particularly image_tag
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1121 Head Helpers
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Some of the helper methods in this module help you add content to the head element of your HTML document
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auto discovery link tag(type = :rss, url options = {}, tag options = {})
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Returns a link tag that browsers and newsreaders can use to autodetect an RSS or ATOM feed The type can either be :rss (default) or :atom Control the link options in url_for format using the url_options You can modify the link tag itself using the tag_options parameter:
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:rel Specify the relation of this link; defaults to "alternate" :type Override MIME type (such as "application/atom+xml") that Rails would
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otherwise generate automatically for you
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:title Specify the title of the link; defaults to a capitalized type
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112 AssetTagHelper
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Here are examples of usages of auto_discovery_link_tag as shown in the Rails API docs:
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auto_discovery_link_tag # => <link rel="alternate" type="application/rss+xml" title="RSS" href="http://wwwcurenthostcom/controller/action" /> auto_discovery_link_tag(:atom) # => <link rel="alternate" type="application/atom+xml" title="ATOM" href="http://wwwcurenthostcom/controller/action" /> auto_discovery_link_tag(:rss, {:action => "feed"}) # => <link rel="alternate" type="application/rss+xml" title="RSS" href="http://wwwcurenthostcom/controller/feed" /> auto_discovery_link_tag(:rss, {:action => "feed"}, {:title => "My RSS"}) # => <link rel="alternate" type="application/rss+xml" title="My RSS" href="http://wwwcurenthostcom/controller/feed" />
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The Lesson of the Favorite Icon Because of the options provided, you could theoretically use auto_discovery_ link_tag to generate a link tag for a favorite icon, the little image that displays in the browser s address bar and bookmarks:
auto_discovery_link_tag('image/x-icon', 'faviconico', :rel => 'shortcut icon', :title => '') # => <link rel="shortcut icon" href="faviconico" type="image/x-icon" title="">
Helpers
That said, there is very little reason, if any, to use the auto_discovery_link_tag to generate a favorite icon link in this way, because the Rails incantation is longer and more complicated than typing the HTML code! Neither is there anything dynamic about the construction of this tag that requires helper logic I made a point of including this example to reinforce the lesson that it is not necessarily the Rails way to use helpers to generate static markup that you could otherwise go ahead and write yourself
javascript include tag(*sources)
Returns a script tag for each of the sources provided You can pass in the filename (the js extension is optional) of JavaScript files that exist in your public/javascripts directory for inclusion into the current page, or you can pass their full path, relative to your document root To include the Prototype and Scriptaculous JavaScript libraries in your application, pass :defaults as the source When you re using :defaults, if an applicationjs
11: All About Helpers
file exists in your public/javascripts directory, it will be included as well You can modify the attributes of the script tag by passing a hash as the last argument
javascript_include_tag "xmlhr", :defer => 'defer' # => <script type="text/javascript" src="/javascripts/xmlhrjs" defer="defer"></script> javascript_include_tag "commonjavascript", "/elsewhere/cools" # => <script type="text/javascript" src="/javascripts/commonjavascript"></script> <script type="text/javascript" src="/elsewhere/coolsjs"></script> javascript_include_tag :defaults # => <script type="text/javascript" src="/javascripts/prototypejs"></script> <script type="text/javascript" src="/javascripts/effectsjs"></script> <script type="text/javascript" src="/javascripts/applicationjs"></script>
javascript path(source)
Computes the path to a JavaScript asset in the public/javascripts directory If the source filename has no extension, js will be appended Full paths from the document root will be passed through Used internally by javascript_include_tag to build the script path
stylesheet link tag(*sources)
Returns a stylesheet link tag for the sources specified as arguments If you don t specify an extension, css will be appended automatically Just like other helper methods that take a variable number of arguments plus options, you can pass a hash of options as the last argument and they will be added as attributes to the tag
stylesheet_link_tag "style" # => <link href="/stylesheets/stylecss" media="screen" rel="Stylesheet" type="text/css" /> stylesheet_link_tag "style", :media => "all" # => <link href="/stylesheets/stylecss" media="all" rel="Stylesheet" type="text/css" /> stylesheet_link_tag "randomstyles", "/css/stylish" # => <link href="/stylesheets/randomstyles" media="screen" rel="Stylesheet" type="text/css" /> <link href="/css/stylishcss" media="screen" rel="Stylesheet" type="text/css" />