Module: SimpleNavigation::Helpers

Defined in:
lib/simple_navigation/helpers.rb

Overview

View helpers to render the navigation.

Use render_navigation as following to render your navigation:

  • call render_navigation without :level option to render your complete navigation as nested tree.

  • call render_navigation(level: x) to render a specific navigation level (e.g. level: 1 to render your primary navigation, level: 2 to render the sub navigation and so forth)

  • call render_navigation(:level => 2..3) to render navigation levels 2 and 3).

For example, you could use render_navigation(level: 1) to render your primary navigation as tabs and render_navigation(level: 2..3) to render the rest of the navigation as a tree in a sidebar.

Examples (using Haml)

#primary_navigation= render_navigation(level: 1)

#sub_navigation= render_navigation(level: 2)

#nested_navigation= render_navigation

#top_navigation= render_navigation(level: 1..2)
#sidebar_navigation= render_navigation(level: 3)

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.apply_defaults(options) ⇒ Object 



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# File 'lib/simple_navigation/helpers.rb', line 43

def self.apply_defaults(options)
  options[:level] = options.delete(:levels) if options[:levels]
  { context: :default, level: :all }.merge(options)
end

.load_config(options, includer, &block) ⇒ Object 



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# File 'lib/simple_navigation/helpers.rb', line 27

def self.load_config(options, includer, &block)
  context = options.delete(:context)
  SimpleNavigation.init_adapter_from includer
  SimpleNavigation.load_config context
  SimpleNavigation::Configuration.eval_config context

  if block_given? || options[:items]
    SimpleNavigation.config.items(options[:items], &block)
  end

  unless SimpleNavigation.primary_navigation
    fail 'no primary navigation defined, either use a navigation config ' \
         'file or pass items directly to render_navigation'
  end
end

Instance Method Details

#active_navigation_item(options = {}, value_for_nil = nil) ⇒ Object

Returns the currently active navigation item belonging to the specified level.

The following options are supported:

  • :level - defaults to :all which returns the most specific/deepest selected item (the leaf). Specify a specific level to only look for the selected item in the specified level of navigation (e.g. level: 1 for primary_navigation, etc).

  • :context - specifies the context for which you would like to find the active navigation item. Defaults to :default which loads the default navigation.rb (i.e. config/navigation.rb). If you specify a context then the plugin tries to load the configuration file for that context, e.g. if you call active_navigation_item_name(context: :admin) the file config/admin_navigation.rb will be loaded and used for searching the active item.

  • :items - you can specify the items directly (e.g. if items are dynamically generated from database). See SimpleNavigation::ItemsProvider for documentation on what to provide as items.

Returns the supplied value_for_nil object (nil by default) if no active item can be found for the specified options



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# File 'lib/simple_navigation/helpers.rb', line 140

def active_navigation_item(options = {}, value_for_nil = nil)
  if options[:level].nil? || options[:level] == :all
    options[:level] = :leaves
  end
  container = active_navigation_item_container(options)
  if container && (item = container.selected_item)
    block_given? ? yield(item) : item
  else
    value_for_nil
  end
end

#active_navigation_item_container(options = {}, &block) ⇒ Object

Returns the currently active item container belonging to the specified level.

The following options are supported:

  • :level - defaults to :all which returns the least specific/shallowest selected item. Specify a specific level to only look for the selected item in the specified level of navigation (e.g. level: 1 for primary_navigation, etc).

  • :context - specifies the context for which you would like to find the active navigation item. Defaults to :default which loads the default navigation.rb (i.e. config/navigation.rb). If you specify a context then the plugin tries to load the configuration file for that context, e.g. if you call active_navigation_item_name(context: :admin) the file config/admin_navigation.rb will be loaded and used for searching the active item.

  • :items - you can specify the items directly (e.g. if items are dynamically generated from database). See SimpleNavigation::ItemsProvider for documentation on what to provide as items.

Returns nil if no active item container can be found



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# File 'lib/simple_navigation/helpers.rb', line 175

def active_navigation_item_container(options = {}, &block)
  options = SimpleNavigation::Helpers.apply_defaults(options)
  SimpleNavigation::Helpers.load_config(options, self, &block)
  SimpleNavigation.active_item_container_for(options[:level])
end

#active_navigation_item_key(options = {}) ⇒ Object

Returns the key of the currently active navigation item belonging to the specified level.

See Helpers#active_navigation_item for supported options.

Returns nil if no active item can be found for the specified options



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# File 'lib/simple_navigation/helpers.rb', line 111

def active_navigation_item_key(options = {})
  active_navigation_item(options, &:key)
end

#active_navigation_item_name(options = {}) ⇒ Object

Returns the name of the currently active navigation item belonging to the specified level.

See Helpers#active_navigation_item for supported options.

Returns an empty string if no active item can be found for the specified options



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# File 'lib/simple_navigation/helpers.rb', line 98

def active_navigation_item_name(options = {})
  active_navigation_item(options, '') do |item|
    item.name(apply_generator: false)
  end
end

#render_navigation(options = {}, &block) ⇒ Object

Renders the navigation according to the specified options-hash.

The following options are supported:

  • :level - defaults to :all which renders the the sub_navigation for an active primary_navigation inside that active primary_navigation item. Specify a specific level to only render that level of navigation (e.g. level: 1 for primary_navigation, etc). Specifiy a Range of levels to render only those specific levels (e.g. level: 1..2 to render both your first and second levels, maybe you want to render your third level somewhere else on the page)

  • :expand_all - defaults to false. If set to true the all specified levels will be rendered as a fully expanded tree (always open). This is useful for javascript menus like Superfish.

  • :context - specifies the context for which you would render the navigation. Defaults to :default which loads the default navigation.rb (i.e. config/navigation.rb). If you specify a context then the plugin tries to load the configuration file for that context, e.g. if you call render_navigation(context: :admin) the file config/admin_navigation.rb will be loaded and used for rendering the navigation.

  • :items - you can specify the items directly (e.g. if items are dynamically generated from database). See SimpleNavigation::ItemsProvider for documentation on what to provide as items.

  • :renderer - specify the renderer to be used for rendering the navigation. Either provide the Class or a symbol matching a registered renderer. Defaults to :list (html list renderer).

Instead of using the :items option, a block can be passed to specify the items dynamically

Examples

render_navigation do |menu|
  menu.item :posts, "Posts", posts_path
end



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# File 'lib/simple_navigation/helpers.rb', line 86

def render_navigation(options = {}, &block)
  container = active_navigation_item_container(options, &block)
  container && container.render(options)
end