Comparing version 15 and version 14

h2. Introduction
Global tags are Radius rags like  that work on all pages and do not require specifying a Behavior for the page. 

If you have deployed Radiant with the --unpack switch, you can edit app/models/page_context.rb directly. 

Alternatively you can write an extension, as covered in [[Creating Radiant Extensions]].

h2. Examples

h3. If Children Exist
To create a new tag that only renders its content when the current page has children, use this code

{{{
tag "if_children" do |tag|
  tag.expand if tag.locals.page.has_children?
end
}}}


Then in your page write

{{{


  
  

  


}}}


This will create a unordered list of links to the children of the page, sorted by ascending title, if any exist. 

h3. Random Child Page

{{{
tag "children:random" do |tag|
  children = tag.locals.children
  if children.size > 0
    index = rand(children.size)
    tag.locals.page = children[index]
    tag.expand
  end
end
}}}


Then in your page, write

{{{

}}}


Or just

{{{

}}}


Note that this will only select one child page, and needs modification to select more than one.

h3. Refer to the Parent Page

{{{
tag "parent" do |tag|
  tag.locals.page = tag.locals.page.parent
  tag.expand if tag.locals.page.has_parent?
end

tag "if_parent" do |tag|
  tag.expand if tag.locals.page.has_parent?
end

tag "unless_parent" do |tag|
  tag.expand unless tag.locals.page.has_parent?
end
}}}


In your page, write this:

{{{
Go up
}}}

This will create a link to the parent page that says "Go up".

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