openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
73 lines (60 loc) • 2.11 kB
JavaScript
goog.require('ol.Map');
goog.require('ol.Overlay');
goog.require('ol.View');
goog.require('ol.layer.Tile');
goog.require('ol.source.TileJSON');
goog.require('ol.source.TileUTFGrid');
var key = 'pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiRk1kMWZaSSJ9.E5BkluenyWQMsBLsuByrmg';
var mapLayer = new ol.layer.Tile({
source: new ol.source.TileJSON({
url: 'https://api.tiles.mapbox.com/v4/mapbox.geography-class.json?secure&access_token=' + key
})
});
var gridSource = new ol.source.TileUTFGrid({
url: 'https://api.tiles.mapbox.com/v4/mapbox.geography-class.json?secure&access_token=' + key
});
var gridLayer = new ol.layer.Tile({source: gridSource});
var view = new ol.View({
center: [0, 0],
zoom: 1
});
var mapElement = document.getElementById('map');
var map = new ol.Map({
layers: [mapLayer, gridLayer],
target: mapElement,
view: view
});
var infoElement = document.getElementById('country-info');
var flagElement = document.getElementById('country-flag');
var nameElement = document.getElementById('country-name');
var infoOverlay = new ol.Overlay({
element: infoElement,
offset: [15, 15],
stopEvent: false
});
map.addOverlay(infoOverlay);
var displayCountryInfo = function(coordinate) {
var viewResolution = /** @type {number} */ (view.getResolution());
gridSource.forDataAtCoordinateAndResolution(coordinate, viewResolution,
function(data) {
// If you want to use the template from the TileJSON,
// load the mustache.js library separately and call
// info.innerHTML = Mustache.render(gridSource.getTemplate(), data);
mapElement.style.cursor = data ? 'pointer' : '';
if (data) {
flagElement.src = 'data:image/png;base64,' + data['flag_png'];
nameElement.innerHTML = data['admin'];
}
infoOverlay.setPosition(data ? coordinate : undefined);
});
};
map.on('pointermove', function(evt) {
if (evt.dragging) {
return;
}
var coordinate = map.getEventCoordinate(evt.originalEvent);
displayCountryInfo(coordinate);
});
map.on('click', function(evt) {
displayCountryInfo(evt.coordinate);
});