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<!DOCTYPE html>
<html>
<head>
<title>Load POIs as the map moves - 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 load points of interest data on the map as the user moves the map." />
<meta name="keywords" content="map, gis, API, SDK, services, module, search, points of interest, POI" />
<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>
<!-- Add a reference to the Azure Maps Services Module JavaScript file. -->
<script src="https://atlas.microsoft.com/sdk/javascript/service/2/atlas-service.min.js"></script>
<script type='text/javascript'>
var map, searchURL, datasource, popup, lastSearchPosition;
var minSearchZoom = 15; //The minium zoom level the user must be zoomed into before POI data is searched/displayed.
var minSearchCenterOffset = 200; //The minimum distance in meters the map center mush move before a new search is done.
var maxSearchResults = 500; //The maximum number of points of interests that will be queried on each update.
//The service has a limit of 100 results, but additional results can be accesed by paging through the results.
function GetMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-6.271616, 53.346430],
zoom: 16,
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>'
}
});
//Use SubscriptionKeyCredential with a subscription key
var subscriptionKeyCredential = new atlas.service.SubscriptionKeyCredential(atlas.getSubscriptionKey());
//Use subscriptionKeyCredential to create a pipeline
var pipeline = atlas.service.MapsURL.newPipeline(subscriptionKeyCredential, {
retryOptions: { maxTries: 4 }, // Retry options
});
//Create an instance of the SearchURL client.
searchURL = new atlas.service.SearchURL(pipeline);
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Create a data source to add point of interest data to.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Add a bubble layer to render the points of interests.
var poiLayer = new atlas.layer.BubbleLayer(datasource, null, {
minZoom: minSearchZoom,
//Set the color based on the category code: https://docs.microsoft.com/en-us/azure/azure-maps/supported-search-categories
color: [
'match',
['get', 'code', ['at', 0, ['get', 'classifications', ['get', 'poi']]]],
'SHOP', 'PURPLE',
'RESTAURANT', 'yellow',
'CAFE_PUB', 'green',
'PARKING_GARAGE', 'lightblue',
'CASH_DISPENSER', 'limegreen',
'PUBLIC_TRANSPORT_STOP', 'blue',
'NIGHTLIFE', 'pink',
//Default color. Set to 'transparent' to hide all other categories.
'gray'
]
});
map.layers.add(poiLayer);
//Add an event to get nearby POI when the map has finished moving.
map.events.add('moveend', getNearbyPoi);
//Load points of interests for the initial map view.
getNearbyPoi();
//Create a reusable popup.
popup = new atlas.Popup();
//Add a click event to the poi layer.
map.events.add('click', poiLayer, poiClicked);
});
}
function getNearbyPoi() {
var camera = map.getCamera();
if (!lastSearchPosition || (Math.ceil(camera.zoom) >= minSearchZoom &&
atlas.math.getDistanceTo(lastSearchPosition, camera.center) >= minSearchCenterOffset)) {
//Store the center to reduce the number of searches done as the map moves.
lastSearchPosition = camera.center;
//Perform the search.
performSearch(camera.center, 0);
}
}
function performSearch(center, offset) {
//Make a query for nearby points of interest.
searchURL.searchNearby(atlas.service.Aborter.timeout(3000), center, {
ofs: offset * 100,
limit: 100,
radius: 5000,
view: 'Auto'
}).then(results => {
var data = results.geojson.getFeatures();
//If offset is 0, remove previous data, check the response to see if there are more results to page through.
if (results.summary.offset == 0) {
//Replace all data on the map with the new data.
datasource.setShapes(data);
//Calculate the number of pages
var maxPages = Math.ceil(Math.min(maxSearchResults, results.summary.totalResults) / 100);
//Make requests for the other pages.
for (var oft = 1; oft <= maxPages; oft++) {
performSearch(center, oft);
}
} else {
//Add the results to the data source.
datasource.add(data);
}
});
}
function poiClicked(e) {
//Make sure the event occurred on a point feature.
if (e.shapes && e.shapes.length > 0 && e.shapes[0].getType() === 'Point') {
var properties = e.shapes[0].getProperties();
//Using the properties, create HTML to fill the popup with useful information.
var html = ['<div style="padding:10px;"><span style="font-size:14px;font-weight:bold;">'];
var addressInTitle = false;
if (properties.type === 'POI' && properties.poi && properties.poi.name) {
html.push(properties.poi.name);
} else if (properties.address && properties.address.freeformAddress) {
html.push(properties.address.freeformAddress);
addressInTitle = true;
}
html.push('</span><br/>');
if (!addressInTitle && properties.address && properties.address.freeformAddress) {
html.push(properties.address.freeformAddress, '<br/>');
}
html.push('<b>Type: </b>', properties.type, '<br/>');
if (properties.entityType) {
html.push('<b>Entity Type: </b>', properties.entityType, '<br/>');
}
if (properties.type === 'POI' && properties.poi) {
if (properties.poi.phone) {
html.push('<b>Phone: </b>', properties.poi.phone, '<br/>');
}
if (properties.poi.url) {
html.push('<b>URL: </b>', properties.poi.url, '<br/>');
}
if (properties.poi.classifications) {
html.push('<b>Classifications:</b><br/>');
for (var i = 0; i < properties.poi.classifications.length; i++) {
for (var j = 0; j < properties.poi.classifications[i].names.length; j++) {
html.push(' - ', properties.poi.classifications[i].names[j].name, '<br/>');
}
}
}
}
html.push('</div>');
//Set the popup options.
popup.setOptions({
//Update the content of the popup.
content: html.join(''),
//Update the position of the popup with the pins coordinate.
position: e.shapes[0].getCoordinates()
});
//Open the popup.
popup.open(map);
}
}
</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>Load POIs as the map moves</legend>
This sample shows how to load points of interest data on the map as the user moves the map.
Based on the classification code (category), a different color is used to render the point of interest.
The search service returns up to 100 results, but more can be retrieved by paging through the results offset parameter.
Some optimizations are made to only retrieve more points of interest when the user has moved the map enough to warrent more data.
Additionally, this sample also hides the results and doesn't query new data when zoomed out.
</fieldset>
</body>
</html>
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