Struct NavDropdown 

pub struct NavDropdown { /* private fields */ }

Collapsible dropdown menu for grouping navigation links.

Keyboard & accessibility

Implements the WAI-ARIA disclosure-navigation pattern: the toggle carries aria-expanded (plus aria-controls when id is set) and the menu stays a plain list of links in the normal tab order — no menu/menuitem roles, which the APG reserves for application menus rather than site navigation.

Arrow-key support is layered on top as the optional enhancement the APG describes: opening the menu focuses the first item (ArrowUp on a closed toggle opens it and focuses the last), ArrowDown/ArrowUp (wrapping) and Home/End move focus over the menu’s links, Escape closes the menu and returns focus to the toggle, and moving focus out of the dropdown (tabbing away or clicking elsewhere) dismisses it.

CSS Classes

• nav-dropdown - Container <li> element
• nav-dropdown-toggle - Toggle button
• nav-dropdown-menu - Inner <ul> menu
• nav-dropdown-caret - Caret indicator

Trait Implementations

impl BaseComponent for NavDropdown

where Self: 'static,

type Message = ()

The Component’s Message.

type Properties = NavDropdownProps

The Component’s Properties.

fn create(ctx: &Context<Self>) -> Self

Creates a component.

fn update(&mut self, _ctx: &Context<Self>, _msg: Self::Message) -> bool

Updates component’s internal state.

fn changed( &mut self, _ctx: &Context<Self>, _old_props: &Self::Properties, ) -> bool

React to changes of component properties.

fn view(&self, ctx: &Context<Self>) -> HtmlResult

Returns a component layout to be rendered.

fn rendered(&mut self, _ctx: &Context<Self>, _first_render: bool)

Notified after a layout is rendered.

fn destroy(&mut self, _ctx: &Context<Self>)

Notified before a component is destroyed.

fn prepare_state(&self) -> Option<String>

Prepares the server-side state.

impl Debug for NavDropdown

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl FunctionProvider for NavDropdown

type Properties = NavDropdownProps

Properties for the Function Component.

fn run(ctx: &mut HookContext, props: &Self::Properties) -> HtmlResult

Render the component. This function returns the Html to be rendered for the component.