WB 2.08.x

show_menu2, version 4.8

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

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 different 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. 

COMMON QUESTIONS

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

Q:  I'm not a programmer. Do you have simpler documentation? 

A:  Nup. This is it. Go hard. Gambarre.

Q:  How do I create a drop-down menu?

A:  This is unrelated to show_menu2. You need to change the template CSS code 

    to display the menu as a drop-down. Try the "allcss2" template from the WB

    addon repository. http://addons.websitebaker.org/pages/templates.php

Q:  Why does the menu disappear after I do a search on my multilingual WB site?

A:  You're missing some required lines in your template.

    1.  Log into WB administration, and go to Settings -> Show advanced settings 

        -> Search Settings -> Header Code and add the following input field 

        after the <form> open tag: 

        <input type="hidden" name="referrer" value="[REFERRER_ID]" />

    2.  In the index.php of your template, add the following input field 

        immediately following the search <form> open tag.

        <input type="hidden" name="referrer" value="<?php echo defined('REFERRER_ID')?REFERRER_ID:PAGE_ID;?>" />

Q:  Multilingual? That sounds cool. How do I do that?

A:  http://help.websitebaker.org/pages/en/advanced-docu.php

Q:  SM2 is generating a warning every time the page is accessed:

    "show_menu2 error: $aOptions is invalid. No flags from group 1 supplied!"

A:  You are passing the wrong values to the function. Have a closer look at the 

    parameters that you are passing. See the PARAMETERS section below for the 

    correct flag values to pass for the $aOptions parameter.

Q:  How do I use a different class/picture/color/widget for each entry in a menu?

A:  Use the [page_id] format string in the $aItemOpen string. Create a unique 

    class or id for each menu item, then reference that item in your CSS or Javascript

    to do whatever you want.

    To add a unique class for each menu item (or similar):

        "<li><a href="[url]" target="[target]" class="[class] p[page_id]">[menu_title]</a>"

        ... creating menu items like ...

        <li><a href="/pages/foo/bar.php" target="_top" class="menu-top p45">Top Menu</a>

        Reference this in your CSS like:

        a.p45 { color: red; }

    To add a unique ID for each menu item (or similar):

        "<li><a id="p[page_id]" href="[url]" target="[target]" class="[class]">[menu_title]</a>"

        ... creating menu items like ...

        <li><a id="p45" href="/pages/foo/bar.php" target="_top" class="menu-top">Top Menu</a>

        Reference this in your CSS like:

        a#p45 { color: red; }

        Note that the ID can only be used if that menu is generated and displayed one time

        only on the page (because HTML ID's must be unique within a page). 

FUNCTION

========

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

    show_menu2(

        $aMenu          = 0,

        $aStart         = SM2_ROOT,

        $aMaxLevel      = SM2_CURR+1,

        $aOptions       = 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.

Ensure that you use each parameter correctly. Use the following rules:

    $aMenu will be 0 for most people.

    $aStart must be either a page ID or a value starting with "SM2_".

    $aMaxLevel must be only values that start with "SM2_".

    $aOptions must be only values that start with "SM2_" (unless you are 

    in a very small minority of users).

    All other parameters are the HTML tag templates that will be 

    output for menus and menu items.

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

the default value.

HTML 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.

$aOptions  

    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.                    

    This parameter also has an extended mode where an associative array of 

    options is supplied. See the EXTENDED OPTIONS section for details. 

    Most users will NOT need to use this.

$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.

EXTENDED OPTIONS

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

The $aOptions parameter is a dual mode parameter. For most users, only the

SM2_* flags will be sufficient. However, to access the extra options, it 

must be supplied as an associative array. Note that the SM2_* flags are

still required and must be supplied as 'flags'.

    'flags'     **REQUIRED** These are the flags described in PARAMETERS

                above for the $aOptions parameter. 

    'notrim'    Specify a number of levels relative to the menu level of 

                $aStart that will always be displayed. This will cause the

                SM2_TRIM flag to be ignored for these levels.

To supply one of these options in addition to the flags, the option array 

should be created and passed as the $aOptions parameter:

    $options = array('flags' => (SM2_TRIM|...), 'notrim' => 1);

    show_menu2(0, SM2_ROOT, SM2_CURR+1, $options);

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() { }

};