Module | ActionView::Helpers::UrlHelper |
In: |
lib/action_view/helpers/url_helper.rb
|
Provides a set of methods for making easy links and getting urls that depend on the controller and action. This means that you can use the same format for links in the views that you do in the controller.
Generates a form containing a single button that submits to the URL created by the set of options. This is the safest method to ensure links that cause changes to your data are not triggered by search bots or accelerators. If the HTML button does not work with your layout, you can also consider using the link_to method with the :method modifier as described in the link_to documentation.
The generated FORM element has a class name of button-to to allow styling of the form itself and its children. You can control the form submission and input element behavior using html_options. This method accepts the :method and :confirm modifiers described in the link_to documentation. If no :method modifier is given, it will default to performing a POST operation. You can also disable the button by passing :disabled => true in html_options.
button_to "New", :action => "new"
Generates the following HTML:
<form method="post" action="/controller/new" class="button-to"> <div><input value="New" type="submit" /></div> </form>
If you are using RESTful routes, you can pass the :method to change the HTTP verb used to submit the form.
button_to "Delete Image", { :action => "delete", :id => @image.id }, :confirm => "Are you sure?", :method => :delete
Which generates the following HTML:
<form method="post" action="/images/delete/1" class="button-to"> <div> <input type="hidden" name="_method" value="delete" /> <input onclick="return confirm('Are you sure?');" value="Delete" type="submit" /> </div> </form>
DEPRECATED. It is reccommended to use the AssetTagHelper::image_tag within a link_to method to generate a linked image.
link_to(image_tag("rss", :size => "30x45", :border => 0), "http://www.example.com")
Creates a link tag of the given name using a URL created by the set of options. See the valid options in the documentation for ActionController::Base#url_for. It‘s also possible to pass a string instead of an options hash to get a link tag that uses the value of the string as the href for the link. If nil is passed as a name, the link itself will become the name.
The html_options will accept a hash of html attributes for the link tag. It also accepts 3 modifiers that specialize the link behavior.
You can mix and match the html_options with the exception of :popup and :method which will raise an ActionView::ActionViewError exception.
link_to "Visit Other Site", "http://www.rubyonrails.org/", :confirm => "Are you sure?" link_to "Help", { :action => "help" }, :popup => true link_to "View Image", { :action => "view" }, :popup => ['new_window_name', 'height=300,width=600'] link_to "Delete Image", { :action => "delete", :id => @image.id }, :confirm => "Are you sure?", :method => :delete
Creates a link tag of the given name using a URL created by the set of options if condition is true, in which case only the name is returned. To specialize the default behavior, you can pass a block that accepts the name or the full argument list for link_to_unless (see the examples in link_to_unless).
Alias for link_image_to
Creates a link tag of the given name using a URL created by the set of options unless condition is true, in which case only the name is returned. To specialize the default behavior, you can pass a block that accepts the name or the full argument list for link_to_unless (see the example).
<%= link_to_unless(@current_user.nil?, "Reply", { :action => "reply" }) %>
This example uses a block to modify the link if the condition isn‘t met.
<%= link_to_unless(@current_user.nil?, "Reply", { :action => "reply" }) do |name| link_to(name, { :controller => "accounts", :action => "signup" }) end %>
Creates a link tag of the given name using a URL created by the set of options unless the current request uri is the same as the links, in which case only the name is returned (or the given block is yielded, if one exists). Refer to the documentation for link_to_unless for block usage.
<ul id="navbar"> <li><%= link_to_unless_current("Home", { :action => "index" }) %></li> <li><%= link_to_unless_current("About Us", { :action => "about" }) %></li> </ul>
This will render the following HTML when on the about us page:
<ul id="navbar"> <li><a href="/controller/index">Home</a></li> <li>About Us</li> </ul>
Creates a mailto link tag to the specified email_address, which is also used as the name of the link unless name is specified. Additional html attributes for the link can be passed in html_options.
mail_to has several methods for hindering email harvestors and customizing the email itself by passing special keys to html_options.
Special HTML Options:
Examples:
mail_to "me@domain.com" # => <a href="mailto:me@domain.com">me@domain.com</a> mail_to "me@domain.com", "My email", :encode => "javascript" # => <script type="text/javascript">eval(unescape('%64%6f%63...%6d%65%6e'))</script> mail_to "me@domain.com", "My email", :encode => "hex" # => <a href="mailto:%6d%65@%64%6f%6d%61%69%6e.%63%6f%6d">My email</a> mail_to "me@domain.com", nil, :replace_at => "_at_", :replace_dot => "_dot_", :class => "email" # => <a href="mailto:me@domain.com" class="email">me_at_domain_dot_com</a> mail_to "me@domain.com", "My email", :cc => "ccaddress@domain.com", :subject => "This is an example email" # => <a href="mailto:me@domain.com?cc=ccaddress@domain.com&subject=This%20is%20an%20example%20email">My email</a>
Returns the URL for the set of options provided. This takes the same options as url_for in action controller. For a list, see the documentation for ActionController::Base#url_for. Note that it‘ll set :only_path => true so you‘ll get the relative /controller/action instead of the fully qualified example.com/controller/action.
When called from a view, url_for returns an HTML escaped url. If you need an unescaped url, pass :escape => false in the options.