Example of a countries vector layer with country information.
The countries are loaded from a GeoJSON file. Information about countries is shown on hover and click. Zoom in a few times to see country name labels.
<!DOCTYPE html> <html> <head> <title>Vector layer 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/3.8.1/css/ol.css" type="text/css"> <script src="http://openlayers.org/en/3.8.1/build/ol.js"></script> </head> <body> <div class="container-fluid"> <div class="row-fluid"> <div class="span12"> <div id="map" class="map"></div> </div> </div> <div class="row-fluid"> <div class="span4"></div> <div class="span4 offset4"> <div id="info" class="alert alert-success"> </div> </div> </div> </div> <script> var style = new ol.style.Style({ fill: new ol.style.Fill({ color: 'rgba(255, 255, 255, 0.6)' }), stroke: new ol.style.Stroke({ color: '#319FD3', width: 1 }), text: new ol.style.Text({ font: '12px Calibri,sans-serif', fill: new ol.style.Fill({ color: '#000' }), stroke: new ol.style.Stroke({ color: '#fff', width: 3 }) }) }); var styles = [style]; var vectorLayer = new ol.layer.Vector({ source: new ol.source.Vector({ url: 'data/geojson/countries.geojson', format: new ol.format.GeoJSON() }), style: function(feature, resolution) { style.getText().setText(resolution < 5000 ? feature.get('name') : ''); return styles; } }); var map = new ol.Map({ layers: [ new ol.layer.Tile({ source: new ol.source.MapQuest({layer: 'sat'}) }), vectorLayer ], target: 'map', view: new ol.View({ center: [0, 0], zoom: 1 }) }); var highlightStyleCache = {}; var featureOverlay = new ol.layer.Vector({ source: new ol.source.Vector(), map: map, style: function(feature, resolution) { var text = resolution < 5000 ? feature.get('name') : ''; if (!highlightStyleCache[text]) { highlightStyleCache[text] = [new ol.style.Style({ stroke: new ol.style.Stroke({ color: '#f00', width: 1 }), fill: new ol.style.Fill({ color: 'rgba(255,0,0,0.1)' }), text: new ol.style.Text({ font: '12px Calibri,sans-serif', text: text, fill: new ol.style.Fill({ color: '#000' }), stroke: new ol.style.Stroke({ color: '#f00', width: 3 }) }) })]; } return highlightStyleCache[text]; } }); var highlight; var displayFeatureInfo = function(pixel) { var feature = map.forEachFeatureAtPixel(pixel, function(feature, layer) { return feature; }); var info = document.getElementById('info'); if (feature) { info.innerHTML = feature.getId() + ': ' + feature.get('name'); } else { info.innerHTML = ' '; } if (feature !== highlight) { if (highlight) { featureOverlay.getSource().removeFeature(highlight); } if (feature) { featureOverlay.getSource().addFeature(feature); } highlight = feature; } }; map.on('pointermove', function(evt) { if (evt.dragging) { return; } var pixel = map.getEventPixel(evt.originalEvent); displayFeatureInfo(pixel); }); map.on('click', function(evt) { displayFeatureInfo(evt.pixel); }); </script> </body> </html>