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Load all results (parallel).html
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Load all results (parallel).html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Load all results (parallel) using Query API - Bing Maps Samples</title>
<meta charset="utf-8" />
<link rel="shortcut icon" href="/favicon.ico"/>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to load all results for a query by making parallel requests." />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, Bing, Bing Maps" />
<meta name="author" content="Microsoft Bing Maps" />
<meta name="screenshot" content="screenshot.jpg" />
<script>
var map;
//Query URL to the 2010 US Census Zip Code tabulation areas data source
var sdsDataSourceUrl = 'https://spatial.virtualearth.net/REST/v1/data/f42cab32d0ee41738d90856badd638d3/USCensus2010_ZCTA5/ZCTA5';
function GetMap() {
map = new Microsoft.Maps.Map('#myMap', {
center: new Microsoft.Maps.Location(40.10, -82.80),
zoom: 7
});
//Load the Bing Spatial Data Services module.
Microsoft.Maps.loadModule('Microsoft.Maps.SpatialDataService', function () {
//Create a query to get zip code tabulation areas in view.
var query = {
queryUrl: sdsDataSourceUrl,
inlineCount: true,
skip: 0,
top: 250,
spatialFilter: {
spatialFilterType: 'intersects',
intersects: map.getBounds()
}
};
//Trigger an initial search.
Microsoft.Maps.SpatialDataService.QueryAPIManager.search(query, map, function (data, inlineCount) {
var results = data;
var pages = Math.ceil(inlineCount / query.top);
var pagesLoaded = 1;
//Now that we know how may results there are, make multiple requests in parallel.
for (var i = 1; i < pages; i++) {
Microsoft.Maps.SpatialDataService.QueryAPIManager.search({
queryUrl: sdsDataSourceUrl,
inlineCount: true,
skip: 250 * i,
top: 250,
spatialFilter: {
spatialFilterType: 'intersects',
intersects: map.getBounds()
}
}, map, function (data, inlineCount) {
pagesLoaded++;
//Concatenate the results
results = results.concat(data);
//Check to see if all result pages have been loaded.
if (pagesLoaded == pages) {
//Add all the results to the map.
map.entities.push(results);
}
});
}
});
});
}
</script>
</head>
<body>
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;background-color:gray"></div>
<fieldset style="width:800px;margin-top:10px;">
<legend>Query API - Load all results (parallel) Sample</legend>
This sample shows how to load all results for a query by making parallel requests. This is slightly faster than the recursive sample, but doesn't display and data until it is all downloaded.
The Query API allows a maximium of 250 results to be returned in a single request.
This sample shows how to make multiple requests in parallel that page through the results and downloads all of the data that matches the query.
</fieldset>
<script>
// Dynamic load the Bing Maps Key and Script
// Get your own Bing Maps key at https://www.microsoft.com/maps
(async () => {
let script = document.createElement("script");
let bingKey = await fetch("https://samples.azuremaps.com/api/GetBingMapsKey").then(r => r.text()).then(key => { return key });
script.setAttribute("src", `https://www.bing.com/api/maps/mapcontrol?callback=GetMap&key=${bingKey}`);
document.body.appendChild(script);
})();
</script>
</body>
</html>