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HTML

              
                <div class='sidebar'>
  <div class='heading'>
    <h1>Our locations</h1>
  </div>
  <div id='listings' class='listings'></div>
</div>
<div id='map' class='map'> </div>
              
            
!

CSS

              
                * { box-sizing: border-box; }

body {
  color: #404040;
  font: 400 15px/22px 'Source Sans Pro', 'Helvetica Neue', Sans-serif;
  font-smoothing: antialiased;
}

h1 {
  font-size: 22px;
  margin: 0;
  font-weight: 400;
}
a {
  color: #404040;
  text-decoration: none;
}
a:hover { color: #101010; }

.sidebar {
  position: absolute;
  width: 33.3333%;
  height: 100%;
  top: 0; left: 0;
  overflow: hidden;
  border-right: 1px solid rgba(0,0,0,0.25);
}

.pad2 { padding: 20px; }
.quiet { color:#888; }

.map {
  position: absolute;
  left: 33.3333%;
  width: 66.6666%;
  top: 0; bottom: 0;
}

.heading {
  background: #fff;
  border-bottom: 1px solid #eee;
  height: 60px;
  line-height: 60px;
  padding: 0 10px;
}

.listings {
  height: 100%;
  overflow: auto;
  padding-bottom: 60px;
}

.listings .item {
  display: block;
  border-bottom: 1px solid #eee;
  padding: 10px;
  text-decoration: none;
}

.listings .item:last-child { border-bottom: none; }

.listings .item .title {
  display: block;
  color: #00853e;
  font-weight: 700;
}

.listings .item .title small { font-weight: 400; }
.listings .item.active .title,
.listings .item .title:hover { color: #8cc63f; }
.listings .item.active { background-color: #f8f8f8; }

::-webkit-scrollbar {
  width: 3px;
  height: 3px;
  border-left: 0;
  background: rgba(0,0,0,0.1);
}
::-webkit-scrollbar-track {
  background: none;
}
::-webkit-scrollbar-thumb {
  background: #00853e;
  border-radius: 0;
}

.clearfix { display: block; }
.clearfix:after {
  content: '.';
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}

/* Marker tweaks */
.leaflet-popup-close-button {
  display: none;
}
.leaflet-popup-content {
  font: 400 15px/22px 'Source Sans Pro', 'Helvetica Neue', Sans-serif;
  padding: 0;
  width: 200px;
}
.leaflet-popup-content-wrapper {
  padding: 0;
}
.leaflet-popup-content h3 {
  background: #91c949;
  color: #fff;
  margin: 0;
  display: block;
  padding: 10px;
  border-radius: 3px 3px 0 0;
  font-weight: 700;
  margin-top: -15px;
}
.leaflet-popup-content div {
  padding: 10px;
}
.leaflet-container .leaflet-marker-icon { cursor: pointer; }
              
            
!

JS

              
                // update your access token here
// L.mapbox.accessToken = ''; 

var map = L.mapbox.map('map', 'mapbox.light') // update with your own map id
        .setView([38.909671288923, -77.034084142948], 16);

  var listings = document.getElementById('listings');
  var locations = L.mapbox.featureLayer().addTo(map);

  locations.loadURL('https://s3-us-west-2.amazonaws.com/s.cdpn.io/6362/sweetgreen.geojson'); // load in your own GeoJSON file here

  function setActive(el) {
    var siblings = listings.getElementsByTagName('div');
    for (var i = 0; i < siblings.length; i++) {
      siblings[i].className = siblings[i].className
        .replace(/active/, '').replace(/\s\s*$/, '');
    }

    el.className += ' active';
  }

  locations.on('ready', function() {
    locations.eachLayer(function(locale) {

      // Shorten locale.feature.properties to just `prop` so we're not
      // writing this long form over and over again.
      var prop = locale.feature.properties;

      // Each marker on the map.
      var popup = '<h3>Sweetgreen</h3><div>' + prop.address;

      var listing = listings.appendChild(document.createElement('div'));
          listing.className = 'item';

      var link = listing.appendChild(document.createElement('a'));
          link.href = '#';
          link.className = 'title';

      link.innerHTML = prop.address;
      if (prop.crossStreet) {
        link.innerHTML += '<br /><small class="quiet">' + prop.crossStreet + '</small>';
        popup += '<br /><small class="quiet">' + prop.crossStreet + '</small>';
      }

      var details = listing.appendChild(document.createElement('div'));
      details.innerHTML = prop.city;
      if (prop.phone) {
        details.innerHTML += ' &middot; ' + prop.phoneFormatted;
      }

      link.onclick = function() {
        setActive(listing);

        // When a menu item is clicked, animate the map to center
        // its associated locale and open its popup.
        map.setView(locale.getLatLng(), 16);
        locale.openPopup();
        return false;
      };

      // Marker interaction
      locale.on('click', function(e) {
          // 1. center the map on the selected marker.
          map.panTo(locale.getLatLng());

          // 2. Set active the markers associated listing.
          setActive(listing);
      });

      popup += '</div>';
      locale.bindPopup(popup);
    });
  });

  locations.on('layeradd', function(e) {
    var marker = e.layer;
    marker.setIcon(L.icon({
      iconUrl: 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/6362/marker.png', // load your own custom marker image here
      iconSize: [56, 56],
      iconAnchor: [28, 28],
      popupAnchor: [0, -34]
    }));
  });
              
            
!
999px

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