Vulcan/packages/telescope-menu/README.md
2015-10-07 15:04:22 +09:00

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# Menu Component
This is a component for generating flexible, nestable menus. It can generates nested menus from a flat list with node `id`s and `parentId`s.
### Usage
Just include the `menuComponent` template while passing the necessary arguments:
```
{{> menuComponent menuItems=menuItems menuLabel="My Menu" menuClass="my-menu-class"}}
```
### Arguments
All arguments are optional unless specified otherwise.
##### `menuItems` (Array) [required]
An array containing the menu's contents (see below).
##### `menuName` (String)
The name of the menu. Used to set a `*name*-menu` CSS class on the menu.
##### `menuLabel` (String/Function)
The menu title label, or a function that returns a label.
##### `menuLabelTemplate` (String)
If provided, will replace the menu label with a custom template.
##### `menuClass` (String)
An optional CSS class given to the menu
##### `itemTemplate` (String)
A custom template used to display individual menu items (defaults to "defaultMenuItem")
### Menu Items Properties
Menu items can have the following properties:
##### `label` (String/Function)
The menu item's label, or a function that returns a label.
##### `description` (String/Function)
The menu item's description, or a function that returns a description.
##### `route` (String/Function)
Either the name of a route to which the menu item should point, or a function that returns a route.
If a route is provided, the class `item-active` will automatically be added to the menu item when its route is the currently active one.
##### `data` (Object)
The data context for the item.
##### `itemClass` (String)
The menu item's CSS class.
##### `template` (String)
An optional custom template. Overrides both the default template and the `itemTemplate` menu-level option.
##### `isHidden` (Function)
If this function returns `true`, the menu item will not be shown.
### Nested Menu Items Properties
Additionally, menu items take a few additional properties to generate nested menus.
##### `_id` (String)
A unique id used for arranging nodes in nested menus.
##### `parentId` (String)
The parent node's id.
##### `isExpanded` (Boolean)
Whether the item's sub-menu should be expanded
### The Menu Item Template
The menu item template is called with the following data context:
##### `menu` (Object)
A reference pointing back to the menu object.
##### `level` (Number)
The current nesting level.
##### `item` (Object)
The current item to display.
### Styling
Out of the box, the menu component accepts a few classes
#### No Class
If you pass no class to the menu, it will not receive any styling at all.
#### `menu-list`
A simple list. Serves as the base for the other styles.
#### `menu-dropdown`
A dropdown menu.
#### `menu-collapsible`
A collapsible menu.
### Events
The menu component includes a few events. Classes used for JS event targeting start with the `js-` prefix.
#### `click .js-menu-toggle`
Makes the current node's child menu expand and collapse.