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config options:
## Description
The menu tag is used for building customizable menus using the [node finder] extension to select the
to-be-used nodes.
## Usage
The menu is constructed using unordered HTML lists by default. However, this can be changed by
specifying (and creating) another menu generation template via the [] configuration
By using the CSS class configuration options (see above), creating a custom template is not
necessary in most cases.
The [] configuration option allows one to specify whether a nested (value "nested") or
a non-nested (value "flat") menu is generated. Non-nested menus are useful if one wants to generate,
for example, a horizontal menu, i.e. a menu that has one horizontal bar for each menu level.
The HTML list item tags have special CSS classes applied to them for styling. These CSS class names
are as follows (changeable via the specified configuration options):
webgen-menu-level*NUMBER* ([])
: This class is set on all items and can be used to style specific menu levels only. `NUMBER` is
replaced with the actual menu level, so the first level menu entries will get a
`webgen-menu-level1` class.
webgen-menu-submenu ([])
: This class is set if the menu item contains sub menu items.
webgen-menu-submenu-inhierarchy ([])
: This class is set if the menu item is an ancestor of the rendered destination node.
webgen-menu-item-selected ([])
: This class is set if the menu item is equal to to the rendered destination node.
### Custom Menu template
The [] configuration option allows one to customize the generated output. Its value
needs to be the (a)(l)cn of a template or page node and this node needs to have a block called
''. This allows one, for example, to add such a block to the default website template (no
need to create a separate template).
There are some special objects for use in a menu template:
: Contains the menu nodes, i.e. the [node finder] extension search result.
: This utility method can be used to return the needed list item "class" attribute and the link to
the menu item. See its API documentation for more information!
## Examples
Since the menu tag uses the [node finder] extension to select the nodes that should be in the menu,
almost anything is possible. If the node selection for the menu can't be accomplished with the
built-in filters, one just needs to write a custom filter.
### Selecting Nodes for a Main Menu
A standard technique for selecting nodes for the main menu is to select all nodes which have a
certain meta information key set.
Most website templates (e.g. the templates in the official [webgen-templates-bundle][1]) use the
custom 'in_menu' meta information to select the nodes and the default sorting mechanism (based on
the [sort_info][sort_info meta information] and/or [title][title meta information] meta
information). To generate the menu using these criterias one can use the following menu tag:
\{menu: {options: {mi: {in_menu: true}, sort: true}}}
`\{menu: {options: {mi: {in_menu: true}, sort: true, lang: node}}}`
: The node finder option 'lang' ensure that the menu only uses nodes in the language of the
destination node.
`\{menu: {options: {mi: {in_menu: true}, sort: true, siblings: [0, -1]}}}`
: The additional 'siblings' option ensures that not all nodes with 'in_menu: true' are shown in the
menu but only those that are siblings of the destination node or one of its parents.
This is probably what most people want to use in a sidebar menu.
`\{menu: {options: {mi: {in_menu: true}, sort: true, absolute_levels: 1}}}`
: This variant makes sure that only the top level menu items are included which is useful, for
example, for a horizontal navigation bar at the top of a website.
`\{menu: {options: {mi: {in_menu: true}, sort: true, absolute_levels: [2,3], and: {absolute_levels: [2,-1]}}}}`
: This variant is a bit (but just a bit) more complex. The first occurence of the 'absolute_levels'
option ensures that only nodes with an absolute level of 2 or 3 are used at most. The second
occurence ensures that no level 3 sub nodes are used for level 2 nodes.
Such a construct can be used, for example, on a side menu to define a maximum number of node
levels that should be shown.
### Selecting Page Fragment Nodes
One often wants to include a menu for the sections (i.e. headings) of the current page node. This can
be achieved by making sure that fragment nodes are created for all headings by using the [content
processor fragments] in the rendering pipeline of the page. Then the following menu tag shows the
\{menu: {options: {descendants: true, levels: [2,100]}}}
The 'descendants' filter selects the node itself and all descendant nodes, the 'levels' filter makes
sure that only the fragment nodes (the node itself would have level 1) are displayed.