@asphalt-react/appbar

Appbar

Appbar component is the main navigation bar for the whole application. Use this component at the root of your application as the top navigation bar. It contains a list of links that can either take the user to another page or to another section on the same page. Appbar is responsive and adapts to small, medium & large screens. You can also create a custom Appbar through a family of unit components exported by Appbar.

Usage

import { Appbar, Nav, NavItem, NavLink } from "@asphalt-react/appbar"

function App () {

  return (
    <Appbar>
      <Nav>
        <NavItem>
          <NavLink asProps={{ href: "/" }}>Home</NavLink>
        </NavItem>
        <NavItem>
          <NavLink asProps={{ href: "/Dashboard" }}>Dashboard</NavLink>
        </NavItem>
      </Nav>
    </Appbar>
  );
}

export default App;

Anatomy

Appbar has 3 sections:

1. Head: Add items in the head section such as Logo using the head prop.
2. Body: Contains the list of items for navigation. This is the children.
3. Tail: Add items in the tail section such as user Avatar or logout button using the tail prop.

The styles required for the Appbar to stick to the top of the screen needs to be added while implementation.

Navigation items

Appbar exports a family of unit components to create the nav items:

1. Nav
2. NavItem
3. NavLink
4. NavItemCaption
5. NavItemIcon
6. NavItemAction

Using these components, you can compose a variety of nav items.

Screen size adaptability

Appbar adapts to smaller screens (below 600px). The Appbar renders at the top of its container with the head and tail section visible. The body section is hidden under a hamburger button that appears in the head section.

Activating the hamburger button shows the hidden sections in a container (or drawer) that covers the complete screen. The hamburger button is replaced by a cross button to close the drawer. Appbar also exposes a close() function that to close the drawer. It can be useful if you want to close the drawer on selecting a nav item. For example:

import { Appbar, Nav, NavItem, NavLink } from "@asphalt-react/appbar"

function App () {
  const close = () => Appbar.close

  return (
    <Appbar>
      <Nav>
        <NavItem>
          <NavLink onClick={close} asProps={{ href: "example.com" }}>Dashboard</NavLink>
        </NavItem>
      </Nav>
    </Appbar>
  )
}

Accessibility

1. Appbar accepts Esc to close the drawer.
2. Appbar also traps focus in the drawer. Press Tab or Shift + Tab to toggle through the focusable elements.

Creating a custom Appbar

Appbar exports layout unit components using which you can create a custom implementation of Appbar:

1. BaseAppbar
2. AppbarHead
3. AppbarBody
4. AppbarTail
5. useAppbar

You would need to add the responsive styles as they are not screen responsive by default. These layout components do not respond to different screen sizes. You can wrap them in containers with media queries for the custom Appbar to adapt to screen sizes. For example:

@media only screen and (max-width: 600px) {
  .container {
    /* some styles */
  }

  .content {
    /* some styles */
  }
}

const CustomAppbar = () => {
  return (
    <div className="container">
      <BaseAppbar>
        <div className="content">
          <AppbarBody>
            // NavItems
          </AppbarBody>
        </div>
      </BaseAppbar>
    </div>
  )
}

Hooks

Appbar exports a useAppbar hook to help you create custom functionality.

useAppbar

React hook to implement the ability to open/close the Appbar in smaller screens. Use this hook when you are implementing your custom Appbar using the unit layout components. Let's look at the usage:

import { Appbar, useAppbar } from "@asphalt-react/appbar"

const CustomAppbar = () => {
  const { visible, open, close } = useAppbar({ defaultOpen: true })

  return (
      <Appbar>
        <div className={visible ? "show" : "hide"}>
          {visible ? (
            <Button onClick={close}>close</Button>
          ) : (
            <Button onClick={open}>open</Button>
          )}
        </div>
      </Appbar>
  )
}

1. visible: A stateful boolean value to control the (open/close) state.
2. open: A function to open the Appbar.
3. close: A function to close the Appbar.

useAppbar accepts the defaultVisible prop as the argument.

Props

children

React node to render in the Appbar content.

type	required	default
node	false	N/A

head

Content to display in the Appbar head.

type	required	default
node	false	null

tail

Content to display in the Appbar tail.

type	required	default
node	false	null

dismissLabel

"aria-label" for the button to close Appbar in smaller screens.

type	required	default
string	false	"close appbar navigation"

menuLabel

"aria-label" for the button to open Appbar in smaller screens.

type	required	default
string	false	"open appbar navigation"

defaultVisible

Appbar shows the body section in the initial state.

type	required	default
bool	false	false

Nav

Props

children

React nodes to render in the Nav content.

type	required	default
node	true	N/A

NavItem

Using NavItem component, links can be added to the Appbar. By default, it renders an <a> tag but you can pass your custom element or React component using as prop. All the props related to the link should be passed in asProps element.

Props

children

Content for a nav item.

type	required	default
node	true	N/A

NavItemCaption

Props

children

React node to render the caption of the nav item.

type	required	default
node	false	N/A

NavItemIcon

Icon for the NavItem. Accepts SVG.

Props

children

Icon to enhance the nav item's caption. Accepts SVG.

type	required	default
node	false	N/A

NavItemAction

Accepts elements for custom actions in a NavItem.

Props

children

React node to render action elements for a nav item.

type	required	default
node	false	N/A

propagateEvent

Allow events to propagate to the parent element.

type	required	default
bool	false	false

NavLink

Renders the link element for a NavItem.

Props

children

React node to render link content.

type	required	default
node	false	N/A

as

Html element/React component to replace the default element. Using this prop, you can use your router's link element, such as "react-router-dom"'s Link element.

type	required	default
elementType	false	"a"

asProps

Pass the props such as "href", "id" for the custom link element passed in as prop.

type	required	default
object	false	{}

active

Marks the nav link as active.

type	required	default
bool	false	false

prominent

An active style. Adds an indicator to accent the active nav link.

type	required	default
bool	false	false

highlight

A subtle active style. Highlights the surface of the nav item.

type	required	default
bool	false	false

icon

An icon only nav link.

type	required	default
bool	false	false

bezel

Adds padding.

type	required	default
bool	false	true

BaseAppbar

The base container unit component.

Props

children

Container for the BaseAppbar content.

type	required	default
node	true	N/A

bezel

Adds padding.

type	required	default
bool	false	true

AppbarHead

The unit component for rendering the head elements.

Props

children

Container for the AppbarHead content.

type	required	default
node	false	N/A

bezel

Adds padding.

type	required	default
bool	false	true

AppbarBody

The unit component to render the main content.

Props

children

Container for the AppbarBody content.

type	required	default
node	true	N/A

AppbarTail

React node to render content in the tail section.

Props

children

Container for the AppbarTail content.

type	required	default
node	true	N/A

bezel

Adds padding.

type	required	default
bool	false	true