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<!DOCTYPE html>
<html>
<head>
<title>Data-driven symbol icons - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<meta http-equiv="x-ua-compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to use multiple custom icons in a single symbol layer by using data-driven styling with an expression." />
<meta name="keywords" content="map, gis, API, SDK, markers, pins, pushpins, symbols, layer, icon, image, expression" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
<script type='text/javascript'>
var map, datasource;
function GetMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-73.985708, 40.75773],
zoom: 9,
view: 'Auto',
//Add your Azure Maps subscription key to the map SDK. Get an Azure Maps key at https://azure.com/maps
authOptions: {
authType: 'subscriptionKey',
subscriptionKey: '<Your Azure Maps Key>'
}
});
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Create a data source and add it to the map.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Load some point data into the data source.
datasource.importDataFromUrl('../../Common/data/geojson/SamplePoiDataSet.json');
//Create an array of custom icon promises to load into the map.
var iconPromises = [
map.imageSprite.add('gas_station_icon', '../Common/images/icons/gas_station_pin.png'),
map.imageSprite.add('grocery_store_icon', '../Common/images/icons/grocery_cart_pin.png'),
map.imageSprite.add('restaurant_icon', '../Common/images/icons/restaurant_pin.png'),
map.imageSprite.add('school_icon', '../Common/images/icons/school_pin.png'),
];
//Load all the custom image icons into the map resources.
Promise.all(iconPromises).then(function () {
//Add a layer for rendering point data as symbols.
map.layers.add(new atlas.layer.SymbolLayer(datasource, null, {
iconOptions: {
//Use a match expression to select the image icon based on the EntityType property of the data point.
image: [
'match',
['get', 'EntityType'],
//For each entity type, specify the icon name to use.
'Gas Station', 'gas_station_icon',
'Grocery Store', 'grocery_store_icon',
'Restaurant', 'restaurant_icon',
'School', 'school_icon',
//Default fallback icon.
'marker-blue'
]
}
}));
});
});
}
</script>
</head>
<body onload="GetMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend>Data-driven symbol icons</legend>
This sample shows how to use multiple custom icons in a single symbol layer by using data-driven styling with an expression.
This sample uses a GeoJSON file that contains points of interest as a data source.
Each record in this data set has an EntityType property which is one of the following properties:
'Gas Station', 'Grocery Store', 'Restaurant', 'School'.
This sample uses the EntityType property to select the icon to display on the map.
</fieldset>
</body>
</html>
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