Example of exporting a map as a PNG image.
Example of exporting a map as a PNG image.
<!DOCTYPE html>
<html>
<head>
<title>Export map example</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://openlayers.org/en/v3.9.0/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.9.0/build/ol.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
<div id="no-download" class="alert alert-danger" style="display: none">
This example requires a browser that supports the
<a href="http://caniuse.com/#feat=download">link download</a> attribute.
</div>
<a id="export-png" class="btn btn-default" download="map.png"><i class="fa fa-download"></i> Export PNG</a>
</div>
</div>
</div>
<script>
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
new ol.layer.Vector({
source: new ol.source.Vector({
url: 'data/geojson/countries.geojson',
format: new ol.format.GeoJSON()
})
})
],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: new ol.View({
center: [0, 0],
zoom: 2
})
});
var exportPNGElement = document.getElementById('export-png');
if ('download' in exportPNGElement) {
exportPNGElement.addEventListener('click', function(e) {
map.once('postcompose', function(event) {
var canvas = event.context.canvas;
exportPNGElement.href = canvas.toDataURL('image/png');
});
map.renderSync();
}, false);
} else {
var info = document.getElementById('no-download');
/**
* display error message
*/
info.style.display = '';
}
</script>
</body>
</html>