<div id="app">
	<h1>Vue Router Focus</h1>
	<ul class="nav">
		<li>
			<router-link to="/">Home</router-link>
		</li>
		<li>
			<router-link to="/cat">Cat Ipsum</router-link>
		</li>
		<li>
			<router-link to="/hipster">Hipster Ipsum</router-link>	
		</li>
  <li>
			<router-link to="/cupcake">Cupcake Ipsum</router-link>	
		</li>
	</ul>
	<hr />
	<router-view ref="routerView"></router-view>
</div>

/* Outline for non-interactive elements with focus for debugging */

*:focus {
 outline: 1px solid red;
}

.nav {
 list-style: none;
}

.nav li {
	float: left;
}

.content {
	min-height: 300px;
}

#app {
 margin: auto;
 max-width: 66em;
 padding: 20px;
 line-height: 1.7;
}

// Just dummy components. Scroll past for the focus part.
const Home = Vue.component('home', {
	template: `<div class="content">
<h2 ref="componentFocusTarget">Welcome!</h2>
<p>Just some text with <a href="#">a demo link</a>.</p>
</div>`
});

const Cat = Vue.component('cat', {
	template: `<div class="content" ref="componentFocusTarget">
<p>Dont wait for the storm to pass, dance in the rain kick up litter decide to want nothing to do with my owner today demand to be let outside at once, and expect owner to wait for me as i think about it cat cat moo moo lick ears lick paws so make meme, make cute face but lick the other cats. Kitty poochy chase imaginary bugs, but stand in front of the computer screen. Sweet beast cat dog hate mouse eat string barf pillow no baths hate everything stare at guinea pigs. My left donut is missing, as is my right loved it, hated it, loved it, hated it scoot butt on the rug cat not kitten around</p>
</div>`
});

const Hipster = Vue.component('hipster', {
	template: `<div class="content"><h2 ref="componentFocusTarget">Hipster Ipsum</h2>
<p>Bushwick blue bottle scenester helvetica ugh, meh four loko. Put a bird on it lumbersexual franzen shabby chic, street art knausgaard trust fund shaman scenester live-edge mixtape taxidermy viral yuccie succulents. Keytar poke bicycle rights, crucifix street art neutra air plant PBR&B hoodie plaid venmo. Tilde swag art party fanny pack vinyl letterpress venmo jean shorts offal mumblecore. Vice blog gentrify mlkshk tattooed occupy snackwave, hoodie craft beer next level migas 8-bit chartreuse. Trust fund food truck drinking vinegar gochujang.</p>
<form><fieldset><legend >Subscribe</legend>
<label>E-Mail: <input type="text"/></label>
<button>Send</button></fieldset></form>
</div>`
});

const Cupcake = Vue.component('cupcake', {
	template: `<div class="content"><h2>Cupcakes</h2>
<p>This component has no <code>componentFocusTarget</code>. Focus will be sent to the wrapper. <a href="#">Email us!</a></p>
<p>Icing dessert soufflé lollipop chocolate bar sweet tart cake chupa chups. Soufflé marzipan jelly beans croissant toffee marzipan cupcake icing fruitcake. Muffin cake pudding soufflé wafer jelly bear claw sesame snaps marshmallow. Marzipan soufflé croissant lemon drops gingerbread sugar plum lemon drops apple pie gummies. Sweet roll donut oat cake toffee cake. Liquorice candy macaroon toffee cookie marzipan.</p>
</div>`
});


const router = new VueRouter({
	routes: [
		{path: '/', component: Home, meta: { title: 'Home'}},
		{path: '/cat', component: Cat, meta: { title: 'Cat'}},
		{path: '/hipster', component: Hipster, meta: { title: 'Hipster'}},
  {path: '/cupcake', component: Cupcake, meta: { title: 'Cupcake'}}
	]
});

const app = new Vue({
	router,
	watch: {
		$route: function(to) {
			this.$nextTick(function () {
	  	// $nextTick = DOM updated
    
    // Change document title
  		document.title = to.meta.title;
		
				setTimeout(() => {

					// Get component's "routeFocusTarget" ref. 
					// If not existent, use router view container
					let focusTarget = (this.$refs.routerView.$refs.componentFocusTarget !== undefined) 
					? this.$refs.routerView.$refs.componentFocusTarget
					: this.$refs.routerView.$el;

					// Make focustarget programmatically focussable
					focusTarget.setAttribute('tabindex', '-1');

					// Focus element
					focusTarget.focus();

					// Remove tabindex from focustarget. 
					// Reason: https://axesslab.com/skip-links/#update-3-a-comment-from-gov-uk
					focusTarget.removeAttribute('tabindex');
				}, 0);
			});
		}
	}
}).$mount('#app');