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HTML

              
                <h1>Sorting a list of locations by how for away they are: Part 2</h1>
<p>In <a href="https://codepen.io/steinbring/pen/RwpOYaG">a previous codepen</a>, we figured out where the user is and where five of the UW System campuses are.  In this pen, we are showing how far they are away from the user (using the <a href="https://en.wikipedia.org/wiki/Haversine_formula
	">Haversine formula</a>).</p>

<div id="app">
	It looks like you are currently at:<br /><br />
	{{location.street}}<br />
	{{location.adminArea5}}, {{location.adminArea3}} {{location.postalCode}}<br /><br />
	
	Where the University of Wisconsin System campuses are at:<br /><br />
	<table>
		<tr>
			<th>Name</th>
			<th>Address</th>
			<th>Distance Away</th>
		</tr>
		<tr v-for="campus in campuses">
			<td>{{campus.name}}</td>
			<td>{{campus.address}}</td>
			<td>{{campus.distance}} km</td>
		</tr>
	</table>
</div> 
              
            
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CSS

              
                
              
            
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JS

              
                new Vue({
  el: "#app",
  data() {
    return {
			location: null,
			campuses: [{name:'UW-Milwaukee',address: '2200 E Kenwood Blvd, Milwaukee, WI 53201',lat:43.075210,long:-87.881470},{name:'UW-Oshkosh',address: '800 Algoma Blvd. Oshkosh, WI 54901',lat:44.026360,long:-88.551500},{name:'UW-Green Bay',address: '2420 Nicolet Dr, Green Bay, WI 54311',lat:44.532299,long:-87.919853},{name:'UW-Parkside',address: '900 Wood Rd, Kenosha, WI 53144',lat:42.646120,long:-87.856200},{name:'UW-Whitewater',address: '800 W Main St, Whitewater, WI 53190',lat:42.834970,long:-88.742950}]
    };
  },
	methods: {
		getDistanceFromLatLonInKm: function(lat1,lon1,lat2,lon2) {
			var R = 6371; // Radius of the earth in km
			var dLat = this.deg2rad(lat2-lat1);  // deg2rad below
			var dLon = this.deg2rad(lon2-lon1); 
			var a = 
				Math.sin(dLat/2) * Math.sin(dLat/2) +
				Math.cos(this.deg2rad(lat1)) * Math.cos(this.deg2rad(lat2)) * 
				Math.sin(dLon/2) * Math.sin(dLon/2)
				; 
			var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
			var d = R * c; // Distance in km
			return d;
		},
		deg2rad: function(deg) {
			return deg * (Math.PI/180)
		},
		geolocation: function() {
      if (navigator.geolocation) {
				navigator.geolocation.getCurrentPosition(this.showPosition);
			} else {
				console.log("Geolocation is not supported by this browser.");
			}
    },
		showPosition: function(position) {
			// Use Axios to make a MapQuest API Call
				axios
				.get("https://www.mapquestapi.com/geocoding/v1/reverse?key=TPWvRrsfpgGWBACqqXd94fbDcfVpy2WJ&location="+position.coords.latitude+"%2C"+position.coords.longitude+"&outFormat=json&thumbMaps=false")
					.then(response=> (this.location = response.data.results[0].locations[0]));
		}
	},
  mounted() {
    this.geolocation();
  },
	watch: {
		location: function(){
			// Loop over the campuses
			for (let i in this.campuses) {
				// Set the distance value in km
				this.campuses[i].distance = this.getDistanceFromLatLonInKm(this.campuses[i].lat,this.campuses[i].long,this.location.latLng.lat,this.location.latLng.lng);
			}
		}
	}
});
              
            
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999px

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