Filtering markers

Show a different set of markers based on user interaction.

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Filtering markers</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.mapbox.com/mapbox.js/v3.1.0/mapbox.js'></script>
<link href='https://api.mapbox.com/mapbox.js/v3.1.0/mapbox.css' rel='stylesheet' />
<style>
  body { margin:0; padding:0; }
  #map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<style>
.menu-ui {
  background:#fff;
  position:absolute;
  top:10px;right:10px;
  z-index:1;
  border-radius:3px;
  width:120px;
  border:1px solid rgba(0,0,0,0.4);
  }
  .menu-ui a {
    font-size:13px;
    color:#404040;
    display:block;
    margin:0;padding:0;
    padding:10px;
    text-decoration:none;
    border-bottom:1px solid rgba(0,0,0,0.25);
    text-align:center;
    }
    .menu-ui a:first-child {
      border-radius:3px 3px 0 0;
      }
    .menu-ui a:last-child {
      border:none;
      border-radius:0 0 3px 3px;
      }
    .menu-ui a:hover {
      background:#f8f8f8;
      color:#404040;
      }
    .menu-ui a.active,
    .menu-ui a.active:hover {
      background:#3887BE;
      color:#FFF;
      }
</style>
<nav id='menu-ui' class='menu-ui'>
  <a href='#' class='active' id='filter-all'>All events</a>
  <a href='#' id='filter-food'>Food events</a>
</nav>
<div id='map'></div>

<script>
L.mapbox.accessToken = '<your access token here>';
    var map = L.mapbox.map('map', 'mapbox.dc-markers'),
        food = document.getElementById('filter-food'),
        all = document.getElementById('filter-all');

    food.onclick = function(e) {
        all.className = '';
        this.className = 'active';
        // The setFilter function takes a GeoJSON feature object
        // and returns true to show it or false to hide it.
        map.featureLayer.setFilter(function(f) {
            return f.properties['marker-symbol'] === 'fast-food';
        });
        return false;
    };

    all.onclick = function() {
        food.className = '';
        this.className = 'active';
        map.featureLayer.setFilter(function(f) {
            // Returning true for all markers shows everything.
            return true;
        });
        return false;
    };
</script>
to create your own custom map and use it in this example.
Use this example by copying its source into your own HTML page and replacing the Map ID with one of your own from your projects. Having trouble with JavaScript? Try out Codecademy or contact our support team.
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