Build and parse examples from examples_src/
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goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.events.condition');
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goog.require('ol.interaction.DragBox');
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goog.require('ol.interaction.Select');
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goog.require('ol.layer.Tile');
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goog.require('ol.layer.Vector');
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goog.require('ol.source.GeoJSON');
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goog.require('ol.source.OSM');
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goog.require('ol.style.Stroke');
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goog.require('ol.style.Style');
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var vectorSource = new ol.source.GeoJSON({
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projection: 'EPSG:3857',
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url: 'data/geojson/countries.geojson'
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});
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var map = new ol.Map({
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layers: [
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new ol.layer.Tile({
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source: new ol.source.OSM()
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}),
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new ol.layer.Vector({
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source: vectorSource
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})
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],
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renderer: 'canvas',
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target: 'map',
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view: new ol.View({
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center: [0, 0],
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zoom: 2
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})
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});
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// a normal select interaction to handle click
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var select = new ol.interaction.Select();
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map.addInteraction(select);
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var selectedFeatures = select.getFeatures();
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// a DragBox interaction used to select features by drawing boxes
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var dragBox = new ol.interaction.DragBox({
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condition: ol.events.condition.shiftKeyOnly,
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style: new ol.style.Style({
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stroke: new ol.style.Stroke({
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color: [0, 0, 255, 1]
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})
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})
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});
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map.addInteraction(dragBox);
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var infoBox = document.getElementById('info');
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dragBox.on('boxend', function(e) {
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// features that intersect the box are added to the collection of
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// selected features, and their names are displayed in the "info"
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// div
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var info = [];
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var extent = dragBox.getGeometry().getExtent();
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vectorSource.forEachFeatureIntersectingExtent(extent, function(feature) {
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selectedFeatures.push(feature);
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info.push(feature.get('name'));
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});
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if (info.length > 0) {
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infoBox.innerHTML = info.join(', ');
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}
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});
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// clear selection when drawing a new box and when clicking on the map
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dragBox.on('boxstart', function(e) {
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selectedFeatures.clear();
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infoBox.innerHTML = ' ';
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});
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map.on('click', function() {
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selectedFeatures.clear();
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infoBox.innerHTML = ' ';
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});
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