---
state: needs-love
---
# TabNav

`<TabNav />` renders a list of items as linked tabs (there is also an option
to use labels vs anchors for links for radio button based tabs).

Each item in the list should be a hash of `label`, `href` and `selected`.

- `label`: The text to show
- `href`: a href, probably generated via `href-to`
- `selected`: whether the item is in the selected state or not, probably
  of the state to transition to.

There are two similar event handlers, `@onclick` and `@onTabClick`.

When using `@onclick`, the `item.label` is passed to the handler. When using
`@onTabClick` the entire 'item' is passed instead, therefore you can add
arbitrary properties to the 'item' to be used in the handler.


**Please note:** This component should probably be rebuilt using contextual
components, and real events. Alternatively this could be hand built with native
HTML using the same `nav/ul/li/a` pattern and you could just use the CSS
component to style it. Unless there is a reason to do this, this component
should be used pending a refactor (please remove this note once refactored into
contextual components)

```hbs preview-template
<figure>
  <figcaption>A TabNav with a conditional button using `compact` which removes empty values from arrays</figcaption>
<TabNav @items={{
  compact
      (array
          (hash label="Health Checks" href="#" selected=true)
          (hash label="Service Instances" href="#" selected=(is-href "docs.something"))
(if false (hash label="Don't show me" href="#" selected=false) '')
          (hash label="Lock Sessions" href="#" selected=false)
          (hash label="Metadata" href="#" selected=false)
      )
}}/>
</figure>
```

A TabNav with using a `StateMachine.dispatch`

```hbs
<figure>
  <figcaption>A TabNav with using a StateMachine.dispatch</figcaption>
  <TabNav @items={{
    compact
      (array
        (hash
          label="1"
          selected=(state-matches fsm.state 'one')
          state="ONE"
        )
        (hash
          label="2"
          selected=(state-matches fsm.state 'two')
          state="TWO"
        )
      )
    }}
    @onTabClicked={{pick 'state' fsm.dispatch}}
  />
</figure>
```

```css
.tab-nav {
  @extend %tab-nav;
}
```