wagtailmenus 1.1.0

Gives you better control over the behaviour of your main menu, and allows you to define flat menus for output in templates.

# What is wagtailmenus?

It's an extension for Torchbox's [Wagtail CMS](https://github.com/torchbox/wagtail) to help you manage and render multi-level navigation and simple flat menus in a consistent, flexible way.

## What does it do?

### 1. Gives you independent control over your root-level main menu items

The `MainMenu` model lets you define the root-level items for your projects's main navigation (or one for each site, if it's a multi-site project) using an inline model `MainMenuItem`. These items can link to pages (you can append an optional hash or querystring to the URL, too) or custom URLs. The custom URL field won't force you to enter a valid URL either, so you can add things like "#request-callback" or "#signup" to link to areas on the active page (perhaps as JS modals).

<img alt="Screenshot of MainMenu edit page in Wagtail admin" src="https://raw.githubusercontent.com/rkhleics/wagtailmenus/master/screenshots/wagtailmenus-mainmenu-edit.png" />

The site's page tree powers everything past the root level, so you don't have to recreate it elsewhere. And as you'd expect, only links to published pages will appear when rendering.

Pages still need to have `show_in_menus` checked to appear in menus (if you really needed to hide a page for some reason, it would be frustrating if they didn't), but your project's main navigation (likely displayed in a way that is sensitive to change) will be protected from accidental additions.

### 2. Allows you to manage any number of 'flat menus' via the CMS

Have you ever hard-coded a menu into a footer at the start of a project, only for those pages never to come into existence? Or maybe the pages were created, but their URLs changed later on, breaking the hard-coded links? How about secondary navigation menus in headers? Flat menus allow you to manage these kind of menus via the CMS, instead of hard-coding them. This means that the page URLs dynamically update to reflect changes, and adding/removing items is possible without needing to change a line of code.

<img alt="Screenshot of FlatMenu list page in Wagtail admin" src="https://raw.githubusercontent.com/rkhleics/wagtailmenus/master/screenshots/wagtailmenus-flatmenu-list.png" />

As you'd expect, only links to published pages will appear when rendering, and just like main menu items, pages must have `show_in_menus` checked in order to appear in flat menus too.

Flat menus are designed for outputting simple, 'flat' lists of links, but they can be made to display multiple levels of pages too. See the instructions below for [using the `{% flat_menu %}` tag](#flat-menu-tag).

### 3. Offers a solution to the issue of key page links becoming 'toggles' in multi-level drop-down menus

Extend the `wagtailmenus.models.MenuPage` model instead of the usual `wagtail.wagtailcore.models.Page` to create your custom page types, and gain a couple of extra fields that will allow you to configure certain pages to appear again alongside their children in multi-level menus. Use the menu tags provided, and that behaviour will remain consistent in all menus throughout your site.

No more adding additional pages into the tree. No more hard-coding additional links into templates, or resorting to javascript hacks.

### 4. A set of powerful template tags to render your menus consistently

Output from the included templates is designed to be fully accessible and compatible with Bootstrap 3. You can easily use your own templates by passing a `template` variable to any of the tags, or you can override the included templates by putting customised versions in a system-preferred location.

<img alt="Screenshot from Sublime editor showing menu template code" src="https://raw.githubusercontent.com/rkhleics/wagtailmenus/master/screenshots/wagtailmenus-menu-templates.png" />

## How to install

1. Install the package using pip: `pip install wagtailmenus`.
2. Add `wagtailmenus` to `INSTALLED_APPS` in your project settings (after `wagtailmodeladmin` and before your `core` app).
3. Run `python manage.py migrate wagtailmenus` to set up the initial database tables.

**Optional steps, if you wish to use `MenuPage`**

**NOTE:** It is not necessary to extend `MenuPage` for all custom page types; Just ones you know will be used for pages that may have children, and will need the option to repeat themselves in sub-menus when listing those children.

1. In your `core` app and other apps (wherever you have defined a custom page/content model to use in your project), import `wagtailmenus.models.MenuPage` and extend that instead of `wagtail.wagtailcore.models.Page`.
2. Run `python manage.py makemigrations` to create migrations for the apps you've updated.
3. Run `python manage.py migrate` to add apply those migrations.

## How to use

**Skip to a section:**

1. [Defining root-level main menu items in the CMS](#defining-main-menu-items)
2. [Using the `{% main_menu %}` tag](#main_menu-tag)
3. [Defining flat menus in the CMS](#defining-flat-menus)
4. [Using the `{% flat_menu %}` tag](#flat_menu-tag)
5. [Using the `{% section_menu %}` tag](#section_menu-tag)
6. [Using the `{% children_menu %}` tag](#children_menu-tag)
7. [Using the `{% sub_menu %}` tag](#sub_menu-tag)
8. [Optional repetition of selected pages in menus using `MenuPage`](#using-menupage)
9. [Overriding default behaviour with settings](#app-settings)

### <a id="defining-main-menu-items"></a>1. Defining root-level main menu items in the CMS

1. Log into the Wagtail CMS for your project (as a superuser).
2. Click on `Settings` in the side menu to access the options in there, then select `Main menu`.
3. You'll be automatically redirected to the `Main menu` edit page for the current site (or the 'default' site, if the current site cannot be identified). For multi-site projects, a 'site switcher' will appear in the top right, allowing you to edit main menus for each site.
4. Use the **MENU ITEMS** inline panel to define the root-level items, and save your changes when finished.

### <a id="main_menu-tag"></a>2. Using the `{% main_menu %}` tag

The `{% main_menu %}` tag allows you to display the `MainMenu` defined for the current site in your Wagtail project, with CSS classes automatically applied to each item to indicate the current page or ancestors of the current page. It also does a few sensible things, like never adding the 'ancestor' class for a homepage link, or outputting children for it.

1. In whichever template you want your main menu to appear, load `menu_tags` using `{% load menu_tags %}`.
2. Use the `{% main_menu %}` tag where you want the menu to appear.

**Optional params for `{% main_menu %}`**

- **`max_levels`** (default: `2`): Provide an integer value to control how many levels of pages should be rendered. If you only want to display the root-level menu items defined as inlines in the CMS (whether the selected pages have children or not), add `max_levels=1` to the tag in your template. You can display additional levels by providing a higher value. You can also override the default value by adding a `WAGTAILMENUS_DEFAULT_MAIN_MENU_MAX_LEVELS` setting to your project's settings module.
- **`allow_multiple_levels`** (default: `True`): Adding `allow_multiple_levels=False` to the tag in your template essentially overrides `max_levels` to `1`. It's just a little more descriptive.
- **`allow_repeating_parents`** (default: `True`): Repetition-related settings on your pages are respected by default, but you can add `allow_repeating_parents=False` to ignore them, and not repeat any pages in sub-menus when rendering multiple levels.
- **`apply_active_classes`** (default: `True`): The tag will attempt to add 'active' and 'ancestor' CSS classes to the menu items (where applicable) to indicate the active page and ancestors of that page. To disable this behaviour, add `apply_active_classes=False` to the tag in your template. You can change the CSS classes used by adding `WAGTAILMENUS_ACTIVE_CLASS` and `WAGTAILMENUS_ACTIVE_ANCESTOR_CLASS` settings to your project's settings module.
- **`template`** (default: `'menus/main_menu.html'`): Lets you render the menu to a template of your choosing. You can also name an alternative template to be used by default, by adding a `WAGTAILMENUS_DEFAULT_MAIN_MENU_TEMPLATE` setting to your project's settings module.

### <a id="defining-flat-menus"></a>3. Defining flat menus in the CMS

1. Log into the Wagtail CMS for your project (as a superuser).
2. Click on `Settings` in the side menu to access the options in there, then select `Flat menus`.
3. Click the button at the top of the page to add a flat menu for your site (or one for each of your sites if you are running a multi-site setup). <img alt="Screenshot indicating the location of the add button on the FlatMenu list page" src="https://raw.githubusercontent.com/rkhleics/wagtailmenus/master/screenshots/wagtailmenus-flatmenu-add.png" />
4. Fill out the form, choosing a 'unique for site' `handle` to reference in your templates, and using the **MENU ITEMS** inline panel to define the links you want the menu to have. Save your changes when finished. <img alt="Screenshot showing the FlatMenu edit interface" src="https://raw.githubusercontent.com/rkhleics/wagtailmenus/master/screenshots/wagtailmenus-flatmenu-edit.png" />

### <a id="flat_menu-tag"></a>4. Using the `{% flat_menu %}` tag

1. In whichever template you want your menu to appear, load `menu_tags` using `{% load menu_tags %}`.
2. Use the `{% flat_menu 'menu-handle' %}` tag where you want the menu to appear, where 'menu-handle' is the unique handle for the menu you added.

**Optional params for `{% flat_menu %}`**

- **`show_menu_heading`** (default: `True`): Passed through to the template used for rendering, where it can be used to conditionally display a heading above the menu.
- **`allow_multiple_levels`** (default: `False`): Flat menus are designed for outputting simple, flat lists of links. But, if the need arises, you can add `allow_multiple_levels=True` to the tag in your template to output multiple page levels. If you haven't already, you may also need to check the **"Allow sub-menu for this item"** box for the menu items you wish to show further levels for.
- **`max_levels`** (default: `2`): If `allow_multiple_levels` is being provided to enable multiple levels, you can use this parameter to specify how many levels you'd like to display.
- **`apply_active_classes`** (default: `False`): Unlike `main_menu` and `section_menu`, `flat_menu` will NOT attempt to add 'active' and 'ancestor' classes to the menu items by default, as this is often not useful. You can override this by adding `apply_active_classes=true` to the tag in your template.
- **`template`** (default: `'menus/flat_menu.html'`): Lets you render the menu to a template of your choosing. You can also name an alternative template to be used by default, by adding a `WAGTAILMENUS_DEFAULT_FLAT_MENU_TEMPLATE` setting to your project's settings module.

### <a id="section_menu-tag"></a>5. Using the `{% section_menu %}` tag

The `{% section_menu %}` tag allows you to display a context-aware, page-driven menu in your project's templates, with CSS classes automatically applied to each item to indicate the active page or ancestors of the active page.

1. In whichever template you want the section menu to appear, load `menu_tags` using `{% load menu_tags %}`.
2. Add `{% section_menu %}` where you want the menu to appear.

**Optional params for `{% section_menu %}`**

- **`show_section_root`** (default: `True`): Passed through to the template used for rendering, where it can be used to conditionally display the root page of the current section.
- **`max_levels`** (default: `2`): Lets you control how many levels of pages should be rendered (the section root page does not count as a level, just the first set of pages below it). If you only want to display the first level of pages below the section root page (whether pages linked to have children or not), add `max_levels=1` to the tag in your template. You can display additional levels by providing a higher value.
- **`allow_repeating_parents`** (default: `True`): Repetition-related settings on your pages are respected by default, but you can add `allow_repeating_parents=False` to ignore them, and not repeat any pages in sub-menus when rendering.
- **`apply_active_classes`** (default: `True`): The tag will add 'active' and 'ancestor' classes to the menu items where applicable, to indicate the active page and ancestors of that page. To disable this behaviour, add `apply_active_classes=False` to the tag in your template.
- **`template`** (default: `'menus/section_menu.html'`): Lets you render the menu to a template of your choosing. You can also name an alternative template to be used by default, by adding a `WAGTAILMENUS_DEFAULT_SECTION_MENU_TEMPLATE` setting to your project's settings module.

### <a id="children_menu-tag"></a>6. Using the `{% children_menu %}` tag

The `{% children_menu %}` tag can be used in page templates to display children pages for the current page, or a different different page. You can also display additional levels as sub-menus, if desired.

1. In whichever template you want the menu to appear, load `menu_tags` using `{% load menu_tags %}`.
2. Use the `{% children_menu %}` tag where you want the menu to appear.

**Optional params for `{% children_menu %}`**

- **`parent_page`**: The tag will automatically pick up `self` from the context to render the children for the active page, but you render a children menu for a different page, if desired. To do so, add `parent_page=page_obj` to the tag in your template, where `page_obj` is the `Page` instance you wish to display children for.
- **`max_levels`** (default: `1`): Lets you control how many levels of pages should be rendered. For example, if you want to display the direct children pages and their children too, add `max_levels=2` to the tag in your template.
- **`allow_repeating_parents`** (default: `True`): Repetition-related settings on your pages are respected by default, but you can add `allow_repeating_parents=False` to ignore them, and not repeat any pages in sub-menus when rendering.
- **`apply_active_classes`** (default: `False`): Unlike `main_menu` and `section_menu`, `children_menu` will NOT attempt to add 'active' and 'ancestor' classes to the menu items by default, as this is often not useful. You can override this by adding `apply_active_classes=true` to the tag in your template.
- **`template`** (default: `'menus/children_menu.html'`): Lets you render the menu to a template of your choosing. You can also name an alternative template to be used by default, by adding a `WAGTAILMENUS_DEFAULT_CHILDREN_MENU_TEMPLATE` setting to your project's settings module.


### <a id="sub_menu-tag"></a>6. Using the `{% sub_menu %}` tag

The `{% sub_menu %}` tag is used within menu templates to render additional levels of pages within a menu. It's designed to pick up on variables added to the context by the other menu tags, and so can behaves inconsistently if called directly, without those context variables having been set. It requires only one parameter to work, which is `menuitem_or_page`, which can either be an instance of `MainMenuItem`, `FlatMenuItem`, or `Page`.

**Optional params for `{% sub_menu %}`**

- **`stop_at_this_level`**: By default, the tag will figure out whether further levels should be rendered or not, depending on what you supplied as `max_levels` to the original menu tag. However, you can override that behaviour by adding either `stop_at_this_level=True` or `stop_at_this_level=False` to the tag in your custom menu template.
- **`allow_repeating_parents`**: By default, the tag will inherit this behaviour from whatever was specified for the original menu tag. However, you can override that behaviour by adding either `allow_repeating_parents=True` or `allow_repeating_parents=False` to the tag in your custom menu template.
- **`apply_active_classes`**: By default, the tag will inherit this behaviour from whatever was specified for the original menu tag. However, you can override that behaviour by adding either `apply_active_classes=True` or `apply_active_classes=False` to the tag in your custom menu template.
- **`template`** (default: `'menus/sub_menu.html'`): Lets you render the menu to a template of your choosing. You can also name an alternative template to be used by default, by adding a `WAGTAILMENUS_DEFAULT_SUB_MENU_TEMPLATE` setting to your project's settings module.

### <a id="using-menupage"></a>8. Optional repetition of selected pages in menus using `MenuPage`

Let's say you have an 'About Us' section on your site. The top-level 'About Us' page has content on it that is just as important as the content on the more specific pages below it (e.g. 'Meet the team', 'Our mission and values', 'Staff vacancies'). So, want people to be able to access the 'About Us' page from your navigation as easily as those pages. But your site uses a drop-down menu, and the 'About Us' link no longer links to the page when clicked... it has simply become a toggle for hiding and showing the pages below it.

Presuming the 'About Us' page extends `wagtailmenus.models.MenuPage`:

1. Edit the 'About Us' page in the CMS, and click on the `Settings` tab.
2. Uncollapse the `ADVANCED MENU BEHAVIOUR` panel by clicking the downward-pointing arrow next to the panel's label. <img alt="Screenshot showing the collapsed 'advanced menu behaviour' panel" src="https://raw.githubusercontent.com/rkhleics/wagtailmenus/master/screenshots/wagtailmenus-menupage-settings-collapsed.png" />
4. Tick the **Repeat in sub-navigation** checkbox that appears, and publish your changes. <img alt="Screenshot show the expanded 'advanced menu behaviour' panel" src="https://github.com/rkhleics/wagtailmenus/blob/master/screenshots/wagtailmenus-menupage-settings-visible.png" />

Now, wherever the children of the `About Us` page are output (using one of the about menu tags), An additional link to the about us page will appear alongside them, allowing the page to be accessed more easily. In the example above, you'll see I've added the text **Section home** into the `Repeated item link text` field. That means that the repeated item will say 'Section home', instead of just repeating the page's title.

The menu tags do some extra work to make sure both links are never assigned the 'active' class. When on the 'About Us' page, the tags will treat the repeated item as the 'active' page, and just assign the 'ancestor' class to the original, so that the behaviour/styling is consistent with other page links rendered at that level.

### <a id="changing-settings"></a>9. Changing the default settings

You can override some of wagtailmenus' default behaviour by adding one of more of the following to your project's settings:

- **`WAGTAILMENUS_ACTIVE_CLASS`** (default: `'active'`): The class added to menu items for the currently active page (when using a menu template with `apply_active_classes=True`)
- **`WAGTAILMENUS_ACTIVE_ANCESTOR_CLASS`** (default: `'ancestor'`): The class added to any menu items for pages that are ancestors of the currently active page (when using a menu template with `apply_active_classes=True`)
- **`WAGTAILMENUS_MAINMENU_MENU_ICON`** (default: `'list-ol'`): Use this to change the icon used to represent `MainMenu` in the Wagtail admin area.
- **`WAGTAILMENUS_FLATMENU_MENU_ICON`** (default: `'list-ol'`): Use this to change the icon used to represent `FlatMenu` in the Wagtail admin area.
- **`WAGTAILMENUS_DEFAULT_MAIN_MENU_TEMPLATE`** (default: `'menus/main_menu.html'`): The name of the template used for rendering by the `{% main_menu %}` tag when a `template` parameter value isn't provided.
- **`WAGTAILMENUS_DEFAULT_FLAT_MENU_TEMPLATE`** (default: `'menus/flat_menu.html'`): The name of the template used for rendering by the `{% flat_menu %}` tag when a `template` parameter value isn't provided.
- **`WAGTAILMENUS_DEFAULT_SECTION_MENU_TEMPLATE`** (default: `'menus/section_menu.html'`): The name of the template used for rendering by the `{% section_menu %}` tag when a `template` parameter value isn't provided.
- **`WAGTAILMENUS_DEFAULT_CHILDREN_MENU_TEMPLATE`** (default: `'menus/children_menu.html'`): The name of the template used for rendering by the `{% children_menu %}` tag when a `template` parameter value isn't provided.
- **`WAGTAILMENUS_DEFAULT_SUB_MENU_TEMPLATE`** (default: `'menus/sub_menu.html'`): The name of the template used for rendering by the `{% sub_menu %}` tag when a `template` parameter value isn't provided.
- **`WAGTAILMENUS_DEFAULT_MAIN_MENU_MAX_LEVELS`** (default: `2`): The default number of maximum levels rendered by `{% main_menu %}` when a `max_levels` parameter value isn't provided.
- **`WAGTAILMENUS_DEFAULT_FLAT_MENU_MAX_LEVELS`** (default: `2`): The default number of maximum levels rendered by `{% flat_menu %}` when `allow_multiple_levels=True` and a `max_levels` parameter value isn't provided.
- **`WAGTAILMENUS_DEFAULT_SECTION_MENU_MAX_LEVELS`** (default: `2`): The default number of maximum levels rendered by `{% section_menu %}` when a `max_levels` parameter value isn't provided.
- **`WAGTAILMENUS_DEFAULT_CHILDREN_MENU_MAX_LEVELS`** (default: `1`): The default number of maximum levels rendered by `{% children_page_menu %}` when a `max_levels` parameter value isn't provided.