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<!DOCTYPE html>
<html lang="en">
<head>
<title>Drag and Drop Shapefiles onto the Map - 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 zipped shapefile (.shp, .dbf, .prj) files onto the map by dragging and dropping from a local file." />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, ESRI Shapefiles, shapefiles, shp, dbf, OGC, web worker, drag, drop, dropover, FileReader" />
<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>
<!-- Load in Catiline.js library which makes it easier to work with web workers. -->
<script src="../Common/scripts/catiline.min.js"></script>
<script type='text/javascript'>
var map, datasource, popup, shpWorker;
function GetMap() {
//Point the Azure Maps domain to the US Azure Gov Cloud domain.
atlas.setDomain('atlas.azure.us');
//Initialize a map instance.
map = new atlas.Map('myMap', {
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 style control and add it to the map.
map.controls.add(new atlas.control.StyleControl(), {
position: 'top-right'
});
//Setup the drag & drop listeners on the map.
var dropZone = document.getElementById('myMap');
dropZone.addEventListener('dragover', handleDragOver, false);
dropZone.addEventListener('drop', handleFileSelect, false);
//Create a data source to add your data to.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Create a popup.
popup = new atlas.Popup();
//Add a layers for rendering the data.
var layers = [
new atlas.layer.PolygonLayer(datasource, null, {
filter: ['any', ['==', ['geometry-type'], 'Polygon'], ['==', ['geometry-type'], 'MultiPolygon']] //Only render Polygon or MultiPolygon in this layer.
}),
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'white',
strokeWidth: 2,
filter: ['any', ['==', ['geometry-type'], 'Polygon'], ['==', ['geometry-type'], 'MultiPolygon']] //Only render Polygon or MultiPolygon in this layer.
}),
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'red',
filter: ['any', ['==', ['geometry-type'], 'LineString'], ['==', ['geometry-type'], 'MultiLineString']] //Only render LineString or MultiLineString in this layer.
}),
new atlas.layer.BubbleLayer(datasource, null, {
filter: ['any', ['==', ['geometry-type'], 'Point'], ['==', ['geometry-type'], 'MultiPoint']] //Only render Point or MultiPoints in this layer.
})
];
map.layers.add(layers, 'labels');
//Add a click event to the layers to show a popup of what the user clicked on.
map.events.add('click', layers, featureClicked);
//Create a web worker that uses the shapefile-js library.
var wfunc = function (base, cb) {
importScripts('../Common/scripts/shp.min.js');
shp(base).then(cb);
};
shpWorker = cw({ data: wfunc }, 2);
});
}
function handleDragOver(evt) {
//Stop the browser from performing its default behavior when a file is dragged and dropped.
evt.stopPropagation();
evt.preventDefault();
evt.dataTransfer.dropEffect = 'copy';
}
function handleFileSelect(evt) {
//Stop the browser from performing its default behavior when a file is dragged and dropped.
evt.stopPropagation();
evt.preventDefault();
//Remove any existing data from the map.
datasource.clear();
//The list of files that have been dragged and dropped onto the map.
var files = evt.dataTransfer.files;
//Keep track of the bounding box of all the data from all files dropped into the map.
var dataBounds = null;
//Loop through and attempt to read each file.
for (var i = 0; i < files.length; i++) {
var reader = new FileReader();
reader.onload = function (e) {
shpWorker.data(e.target.result).then(function (data) {
//Add the GeoJSON data to the data source.
datasource.add(data);
//Calculate the bounding box of the GeoJSON data.
var bounds = atlas.data.BoundingBox.fromData(data);
//If data is already loaded from another GeoJSON file, merge the bounding boxes together.
if (dataBounds) {
dataBounds = atlas.data.BoundingBox.merge(dataBounds, bounds);
} else {
dataBounds = bounds;
}
//Update the map view to show the data.
map.setCamera({
bounds: dataBounds,
padding: 50
});
});
};
//Read the file as text.
reader.readAsArrayBuffer(files[i]);
}
}
function featureClicked(e) {
//Make sure the event occurred on a shape feature.
if (e.shapes && e.shapes.length > 0) {
var properties = e.shapes[0].getProperties();
//By default, show the popup where the mouse event occurred.
var pos = e.position;
//If the shape is a point feature, show the popup at the points coordinate.
if (e.shapes[0].getType() === 'Point') {
pos = e.shapes[0].getCoordinates();
}
//Update the content and position of the popup.
popup.setOptions({
//Create a table from the properties in the feature.
content: atlas.PopupTemplate.applyTemplate(properties),
position: pos,
pixelOffset: [0, 0]
});
//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><h1 style="font-size:16px">Drag and Drop Shapefiles onto the Map</h1></legend>
This sample shows how to load zipped shapefile (.shp, .dbf, .prj) files onto the map by dragging and dropping from a local file.
This sample uses the open source <a href="https://github.com/calvinmetcalf/shapefile-js" target="_blank">Shapefile.js</a> library which converts Shapefiles into GeoJSON which can easily be consumed by the map control.
It also makes use of the open source <a href="http://catilinejs.com/">Catiline.js</a> library which makes working with web workers easier.
</fieldset>
</body>
</html>
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