WB 2.08.x

// $Id$

show_menu2, version 4.5

=======================

A code snippet for the Website Baker CMS software. It provides a complete

replacement for the builtin menu functions. All menu data is retrieved using

a single database query, all types of menu styles (lists, breadcrums, sitemaps)

can be generated with extensive customisation of the resulting HTML.

INSTALLATION

============

1. Download the latest version from http://code.jellycan.com/show_menu2/

2. Log into your WebsiteBaker installation

3. Go to Addons -> Modules

4. If a previous version of show_menu2 is already installed, select it from

   the "Uninstall Module" list and choose the "Uninstall" button.

5. In the "Install Module" section, enter the path to the show_menu2 zip file

   that you downloaded in step 1, and choose the "Install" button.

USING SHOW_MENU2

================

You need to modify the PHP files of your template to call show_menu2 where you

wish to have the menu displayed. Remember when you replace calls to the old

menu functions to use the new parameters that show_menu2 requires.

Often times the default menu generated by show_menu2 is all that you need.

This menu shows the current page and children of the current page. It is

generated by just calling show_menu2 with no parameters. For example:

    show_menu2();

Note that the call to show_menu2 is PHP, so you usually need to wrap it in the

PHP code brackets so that it will execute. Like this:

    <?php show_menu2(); ?>

This default menu generates a complete list based menu with many classes that

allow easy CSS styling. For example, the current menu item will have the

"menu-current" class added to the <li> tag. Additionally, every menu item with

a sub-menu will have the "menu-expand" class added to the <li> tag. This allows

you to create CSS rules to style those menu items differently. For example:

    li.menu-expand  { font-weight: bold; }

    li.menu-current { background: red; }

See the "Output" section for details of exactly what classes are added to each

element. More elaborate and different menu structures are able to be created by

supplying parameters to the show_menu2 function call. For example, to show only

menu items from the top level of the menu you use:

    show_menu2(0, SM2_ROOT, SM2_START);

Alternatively, to show up to two levels of the child menus of the current page:

    show_menu2(0, SM2_CURR+1, SM2_CURR+2);

There are many more possible menus that can be generated by show_menu2. See the

demonstration website at http://code.jellycan.com/sm2test/ for more examples.

FUNCTION

========

The complete call signature and default parameter value for show_menu2 is:

    show_menu2(

        $aMenu          = 0,

        $aStart         = SM2_ROOT,

        $aMaxLevel      = SM2_CURR+1,

        $aFlags         = SM2_TRIM,

        $aItemOpen      = '[li][a][menu_title]</a>',

        $aItemClose     = '</li>',

        $aMenuOpen      = '[ul]',

        $aMenuClose     = '</ul>',

        $aTopItemOpen   = false,

        $aTopMenuOpen   = false

        )

See the "Parameters" section for detailed descriptions of each parameter.

Note that every parameter from $aItemOpen onwards can be supplied as false

in order to get the default value, this allows (for example) a numbered list

to be used while still using the the default menu parameters for the items.

Note that all parameters up to $aFlags need to be explicitly supplied.

For example:

show_menu2(0, SM2_ROOT, SM2_ALL, SM2_ALL, false, false, '<ol>', '</ol>');

OUTPUT

======

The menu is output differently depending on what parameters have been

supplied to the function, however in general the following classes are used

for each menu. Note that items will have multiple classes when relevant.

    CLASS           ATTACHED TO

    ------------    -------------------------------------------------------

    menu-top        First menu tag only

    menu-parent     Every parent menu item of the current page.

    menu-current    Only the menu item for the current page.

    menu-sibling    Every sibling of the current page.

    menu-child      Every sub-menu of the current page.

    menu-expand     Every menu item with children.

    menu-first      First item in any menu or sub-menu.

    menu-last       Last item in any menu or sub-menu.

    The following classes are added only if SM2_NUMCLASS flag has been used.

    menu-N          Every menu item. The N is replaced with the ABSOLUTE

                    menu depth of the item starting with 0. The root level

                    menu is always menu-0, the next level is menu-1, etc.

    menu-child-N    Every sub-menu of the current page, the N is replaced

                    with the relative depth of the submenu starting at 0.

<ul class="menu-top menu-0">

  <li class="menu-0 menu-first">  ... </li>

  <li class="menu-0 menu-expand menu-parent">  ...

  <ul class="menu-1">

    <li class="menu-1 menu-expand menu-first">  ...

    <ul class="menu-2">

      <li class="menu-2 menu-first">  ...

      <li class="menu-2 menu-last">  ...

    </ul>

    </li>

    <li class="menu-1 menu-expand menu-parent">  ...

    <ul class="menu-2">

      <li class="menu-2 menu-expand menu-current menu-first">  ...      ** CURRENT PAGE **

      <ul class="menu-3">

        <li class="menu-3 menu-child menu-child-0 menu-first">  ...

        <ul class="menu-4">

          <li class="menu-4 menu-child menu-child-1 menu-first">  ... </li>

          <li class="menu-4 menu-child menu-child-1 menu-last">  ... </li>

        </ul>

        </li>

        <li class="menu-3 menu-child menu-child-0 menu-last">  ... </li>

      </ul>

      </li>

      <li class="menu-2 menu-sibling menu-last">  ... </li>

    </ul>

    </li>

    <li class="menu-1">  ... </li>

    <li class="menu-1 menu-expand menu-last">  ...

    <ul class="menu-2">

      <li class="menu-2 menu-first menu-last">  ... </li>

    </ul>

    </li>

  </ul>

  </li>

  <li class="menu-0 menu-last">  ... </li>

</ul>

PARAMETERS

==========

$aMenu

    Menu number to use. This is useful when you are using multiple menus.

    Supplying a menu number of 0 will use the default menu for the current

    page. Supplying SM2_ALLMENU will return all menus in the system.

$aStart

    Specify where the menu generation should start from. This is most

    times the parent item of the menu to display. It must be one of the

    following values:

        SM2_ROOT+N  Start N levels down from the root. e.g.

                      SM2_ROOT      Starting at the root menu

                      SM2_ROOT+1    Start 1 level below the root

                      SM2_ROOT+2    Start 2 levels below the root

        SM2_CURR+N  Start N levels down from the current page level. e.g.

                      SM2_CURR      Starts at the current page level. All

                                    sibling menus to the current page.

                      SM2_CURR+1    Starts 1 level down from the current

                                    page with the children menus.

        page_id     Display using the specific page as the parent. All

                    child menus of that page will be displayed. The

                    page_id can be found by editing the page in WB admin

                    interface. The page_id is included in the URL like:

                        http://SITE/admin/pages/modify.php?page_id=35

$aMaxLevel

    Maximum menu level to display. Menus are displayed from the start

    level down to this level.

        SM2_ALL     No limit, all levels are displayed

        SM2_CURR+N  Always show to the current page + N levels.

                      SM2_CURR      Current (no children)

                      SM2_CURR+3    All parents + current + 3 children

        SM2_START+N Always show from the starting level + N levels. The

                    levels of menu will always be displayed regardless of

                    what level the current page is.

                      SM2_START     Single level of menus from starting level

                      SM2_START+1   Starting level and 1 level down

        SM2_MAX+N   Show at most N levels from the starting level. Levels

                    won't be shown if they are below the current level.

                      SM2_MAX       Starting level only (same as SM2_START)

                      SM2_MAX+1     Maximum of starting level and 1 level.

$aFlags

    Specify flags for different generation options for the menu. The flags

    may be combined together using bitwise OR (|). For example, to specify

    both TRIM and PRETTY you should use, SM2_TRIM|SM2_PRETTY.

    GROUP 1

    -------

    Exactly one flag from this group must always be supplied. These flags

    affect how the siblings in the tree are removed from the output.

    SM2_ALL         Show all branches of the menu tree

                        A-1 -> B-1

                            -> B-2 -> C-1

                                   -> C-2 (CURRENT)

                                          -> D-1

                                          -> D-2

                                   -> C-3

                        A-2 -> B-3

                            -> B-4

    SM2_TRIM        Show all sibling menus of pages on the current path.

                    All sub-menus of elements that are not on the path

                    are removed.

                        A-1 -> B-1

                            -> B-2 -> C-1

                                   -> C-2 (CURRENT)

                                          -> D-1

                                          -> D-2

                                   -> C-3

                        A-2

    SM2_CRUMB       Show only the breadcrumb trail, i.e. the current

                    menu and all of it's ancestor menus.

                        A-1 -> B-2 -> C-2 (CURRENT)

    SM2_SIBLING     The same as SM2_TRIM however only sibling menus of

                    the current page are displayed. All other menus are

                    trimmed to show only the path.

                        A-1 -> B-2 -> C-1

                                   -> C-2 (CURRENT)

                                          -> D-1

                                          -> D-2

                                   -> C-3

    GROUP 2

    -------

    All of these flags are optional. Any number of them may be combined.

    SM2_NUMCLASS    Add the numbered menu classes to the menu. If this

                    flag is supplied, the "menu-N" and "menu-child-N"

                    classes will be added.

    SM2_ALLINFO     Load all fields from the page table of the database.

                    This will result in quite a lot of memory being used

                    and is not recommended, however it will make keywords,

                    descriptions, and other fields available. This data

                    is not loaded by default.

                    NOTE: This flag must be used on the *FIRST* call to

                    show_menu2 *for this menu ID*, or in combination with

                    SM2_NOCACHE otherwise it will have no effect.

    SM2_NOCACHE     Do not reuse or store the data read from the database

                    between calls to show_menu2.

    SM2_PRETTY      Pretty print the menu HTML with spacing and newlines

                    for debugging purposes.

    SM2_BUFFER      Do not output the menu HTML but instead buffer it

                    internally and return it as a string from show_menu2.

    SM2_CURRTREE    Exclude all other top level menus from being considered.

                    Only items in the current menu tree will be output.

                    This can be combined with any of the Group 1 flags as

                    necessary.

    SM2_ESCAPE      Call htmlspecialchars on the menu strings. This may be

                    required with older installations of WB. By escaping the

                    raw database strings, it permits menus to have HTML

                    formatting in them that would cause otherwise cause

                    pages to fail validation.

    SM2_NOESCAPE    Default behaviour. Exists only for backwards compatibility.

$aItemOpen

    Format string to use for creating each individual menu item entry.

    A different format string may be used for the very first entry by

    supplying a different format string for $aTopItemOpen. When set to

    false, it uses the default of '[li][a][menu_title]</a>' to maintain

    compatibility with show_menu(). Note however that CSS formatting is

    often easier if the classes are added to the <a> tag. Use the format

    string of '<li>[ac][menu_title]</a>' for this style of tag.

    This parameter may also be specified as an instance of a formatting

    class for the menu. See the section "Formatter" below for details of

    the API this class must expose. When a formatter is supplied, all

    arguments after $aItemOpen are ignored.

$aItemClose

    String used to close each item. Note that this is not a format

    string and no keywords will be replaced. When set to false, it uses

    the default of '</li>'.

$aMenuOpen

    Format string to use for opening a list of menu item entries. A

    different format string may be used for the very first menu by

    supplying a different format string for $aTopMenuOpen. When set to

    false, it uses the default of '[ul]'.

$aMenuClose

    String used to close each menu. Note that this is not a format

    string and no keywords will be replaced. When set to false, it uses

    the default of '</ul>'.

$aTopItemOpen

    Format string for the first item. When set to false, it uses the same

    format as $aItemOpen.

$aTopMenuOpen

    Format string for the first menu. When set to false, it uses the same

    format as $aMenuOpen.

FORMAT STRINGS

==============

The following tags may be included in the format strings for $aItemOpen and

$aMenuOpen and will be replaced with the appropriate text.

[a]             <a> tag (no class):         '<a href="[url]" target="[target]">'

[ac]            <a> tag including class:    '<a href="[url]" target="[target]" class="[class]">'

[li]            <li> tag including class:   '<li class="[class]">'

[ul]            <ul> tag including class:   '<ul class="[class]">'

[class]         List of classes for that page

[menu_title]    Menu title text (HTML entity escaped unless SM2_NOESCAPE flag is used)

[page_title]    Page title text (HTML entity escaped unless SM2_NOESCAPE flag is used)

[url]           Page URL for the <a> tag

[target]        Page target for the <a> tag

[page_id]       Page ID of the current menu item

[parent]        Page ID of the parent menu item

[level]         Page level, the same number as is used for the "menu-N" CSS tag.

[sib]           Current menu sibling number

[sibCount]      Total number of siblings in this menu

[if]            Conditional test (see section CONDITIONAL FORMATTING)

The following tags are only available when the SM2_ALLINFO flag is used.

[description]   Page description

[keywords]      Page keywords

CONDITIONAL FORMATTING

======================

The conditional formatting directive takes one of the following forms:

    [if(A){B}]

    [if(A){B}else{C}]

    A   Conditional test. See below for more details.

    B   Expression emitted when the if-test is true. This may be any string

        that does NOT include the '}' character. It may include any of the

        format strings described in the section FORMAT STRINGS with the

        exception of the conditional test (because '}' is not permitted).

    C   Expression emitted when the if-test is false. This may be any string

        that does NOT include the '}' character. It may include any of the

        format strings described in the section FORMAT STRINGS with the

        exception of the conditional test (because '}' is not permitted).

The conditional test is a combination of one or more boolean tests.

If more than one test is supplied, it must be combined with other tests

using either || (boolean OR) or && (boolean AND).

A single test is made up of the left operand, operator and right operand.

e.g. X == Y where X is the left operand, == is the operator and Y is the

right operand.

    Left operand. It must be one of the following keywords:

        class       Test for existence of one of the classes. Only the

                    "==" and "!=" operators are permitted. In this case

                    these operators have the meaning of "includes"

                    instead of "equals".

        level       Test against the page level.

        sib         Test against the current page sibling number.

        sibCount    Test against the number of siblings in the menu.

        id          Test against the page id.

    Operator. It must be one of the following:

        <           Less Than

        <=          Less Than Equals

        ==          Equals

        !=          Not Equal

        >=          Greater Than Equals

        >           Greater Than

    Right operand. The type of this operand depends on the keyword used

    for the left operand:

        class       One of the "menu-*" class names as listed in the

                    section "OUTPUT".

        level       Test the page level against the following values:

                      <number>  absolute page level

                      root      the root page level

                      granny    the grand-parent page level

                      parent    the parent page level

                      current   the current page level

                      child     the child page level

        id          Test the page id against the following values:

                      <number>  absolute page id

                      parent    the parent page id

                      current   the current page id

        sib         A positive integer, or "sibCount" to test against

                    the count of siblings in this menu.

        sibCount    A positive integer.

For example, valid tests are expression "exp" is emitted only when the menu item:

    [if(class==menu-expand){exp}]   has a sub-menu

    [if(class==menu-first){exp}]    is first item in a menu

    [if(class!=menu-first){exp}]    is NOT first item in a menu

    [if(class==menu-last){exp}]     is last item in a menu

    [if(level==0){exp}]             is at the root

    [if(level>0){exp}]              is not at the root

    [if(sib==2){exp}]               is the second item in a menu

    [if(sibCount>1){exp}]           is in a menu with more than 1 entry

    [if(sibCount!=2){exp}]          is in a menu which doesn't have exactly

    [if(level>parent){exp}]         is in a sibling menu or child of a sibling

    [if(id==parent){exp}]           is the parent of the current page

If an else-clause was added, then the expression for the else would be

emitted in all other cases. For example the expression "foo" is emitted

whenever the if-test is false, so therefore:

    [if(sib==2){exp}else{foo}]          is NOT the second item in a menu

    [if(sibCount>2){exp}else{foo}]      is NOT in a menu with more than 2 entries

For multiple tests, the expression "exp" is emitted only when the menu item:

    [if(sib == 1 || sib > 3){exp}]

        [is the first item] OR [is the 4th or larger item] in the menu

    [if(id == current && class == menu-expand){exp}

        [is the current item] AND [it has children]

Note that all tests are evaluated in the order listed because:

 * there is no short-circuit evaluation (all individual tests are always evaluated)

 * there is no grouping of tests (i.e. no support for parenthesis)

 * both || and && are considered the same level

FORMATTER

=========

Note: This is an advanced and rarely needed feature!

If you are capable of extensive PHP programming, it is possible to replace the

predefined menu formatter that show_menu2 is uses with a custom module. See the

include.php file of show_menu2 for an example of how the menu formatter must be

written. The API it must use is:

class SM2_Formatter

{

    // called once before any menu is processed to allow object initialization

    function initialize() { }

    // called to open the menu list

    function startList($aPage, $aUrl) { }

    // called to open the menu item

    function startItem($aPage, $aUrl, $aCurrSib, $aSibCount) { }

    // called to close the menu item

    function finishItem() { }

    // called to close the menu list

    function finishList() { }

    // called once after all menu has been processed to allow object finalization

    function finalize() { }

    // called once after finalize() if the SM2_NOOUTPUT flag is used

    function getOutput() { }

};