Select Features

This example uses OpenLayers v4.0.1. The latest is v.

#### Select Features

Action type
0 selected features

Example of using the Select interaction.

Choose between `Single-click`, `Click`, `Hover` and `Alt+Click` as the event type for selection in the combobox below. When using `Single-click` or `Click` you can hold do `Shift` key to toggle the feature in the selection.

Note: when `Single-click` is used double-clicks won't select features. This in contrast to `Click`, where a double-click will both select the feature and zoom the map (because of the `DoubleClickZoom` interaction). Note that `Single-click` is less responsive than `Click` because of the delay it uses to detect double-clicks.

In this example, a listener is registered for the Select interaction's `select` event in order to update the selection status above.

Related API documentation:

- ol.Map
,
- ol.View
,
- ol.events.condition
,
- ol.format.GeoJSON
,
- ol.interaction.Select
,
- ol.layer.Tile
,
- ol.layer.Vector
,
- ol.source.OSM
,
- ol.source.Vector

Copy Edit
Select Features Example of using the Select interaction. var raster = new ol.layer.Tile({ source: new ol.source.OSM() }); var vector = new ol.layer.Vector({ source: new ol.source.Vector({ url: 'https://openlayers.org/en/v4.0.1/examples/data/geojson/countries.geojson', format: new ol.format.GeoJSON() }) }); var map = new ol.Map({ layers: [raster, vector], target: 'map', view: new ol.View({ center: [0, 0], zoom: 2 }) }); var select = null; // ref to currently selected interaction // select interaction working on "singleclick" var selectSingleClick = new ol.interaction.Select(); // select interaction working on "click" var selectClick = new ol.interaction.Select({ condition: ol.events.condition.click }); // select interaction working on "pointermove" var selectPointerMove = new ol.interaction.Select({ condition: ol.events.condition.pointerMove }); var selectAltClick = new ol.interaction.Select({ condition: function(mapBrowserEvent) { return ol.events.condition.click(mapBrowserEvent) && ol.events.condition.altKeyOnly(mapBrowserEvent); } }); var selectElement = document.getElementById('type'); var changeInteraction = function() { if (select !== null) { map.removeInteraction(select); } var value = selectElement.value; if (value == 'singleclick') { select = selectSingleClick; } else if (value == 'click') { select = selectClick; } else if (value == 'pointermove') { select = selectPointerMove; } else if (value == 'altclick') { select = selectAltClick; } else { select = null; } if (select !== null) { map.addInteraction(select); select.on('select', function(e) { document.getElementById('status').innerHTML = '&nbsp;' + e.target.getFeatures().getLength() + ' selected features (last operation selected ' + e.selected.length + ' and deselected ' + e.deselected.length + ' features)'; }); } }; /** * onchange callback on the select element. */ selectElement.onchange = changeInteraction; changeInteraction(); <div id="map" class="map"></div> <form class="form-inline"> <label>Action type &nbsp;</label> <select id="type" class="form-control"> <option value="click" selected>Click</option> <option value="singleclick">Single-click</option> <option value="pointermove">Hover</option> <option value="altclick">Alt+Click</option> <option value="none">None</option> </select> <span id="status">&nbsp;0 selected features</span> </form>

    <!DOCTYPE html>
    <html>
      <head>
        <title>Select Features</title>
        <link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css">
        <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
        <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
        <script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script>
      </head>
      <body>
        <div id="map" class="map"></div>
        <form class="form-inline">
          <label>Action type &nbsp;</label>
            <select id="type" class="form-control">
              <option value="click" selected>Click</option>
              <option value="singleclick">Single-click</option>
              <option value="pointermove">Hover</option>
              <option value="altclick">Alt+Click</option>
              <option value="none">None</option>
            </select>
          <span id="status">&nbsp;0 selected features</span>
        </form>
        <script>
          var raster = new ol.layer.Tile({
            source: new ol.source.OSM()
          });

          var vector = new ol.layer.Vector({
            source: new ol.source.Vector({
              url: 'https://openlayers.org/en/v4.0.1/examples/data/geojson/countries.geojson',
              format: new ol.format.GeoJSON()
            })
          });

          var map = new ol.Map({
            layers: [raster, vector],
            target: 'map',
            view: new ol.View({
              center: [0, 0],
              zoom: 2
            })
          });

          var select = null;  // ref to currently selected interaction

          // select interaction working on "singleclick"
          var selectSingleClick = new ol.interaction.Select();

          // select interaction working on "click"
          var selectClick = new ol.interaction.Select({
            condition: ol.events.condition.click
          });

          // select interaction working on "pointermove"
          var selectPointerMove = new ol.interaction.Select({
            condition: ol.events.condition.pointerMove
          });

          var selectAltClick = new ol.interaction.Select({
            condition: function(mapBrowserEvent) {
              return ol.events.condition.click(mapBrowserEvent) &&
                  ol.events.condition.altKeyOnly(mapBrowserEvent);
            }
          });

          var selectElement = document.getElementById('type');

          var changeInteraction = function() {
            if (select !== null) {
              map.removeInteraction(select);
            }
            var value = selectElement.value;
            if (value == 'singleclick') {
              select = selectSingleClick;
            } else if (value == 'click') {
              select = selectClick;
            } else if (value == 'pointermove') {
              select = selectPointerMove;
            } else if (value == 'altclick') {
              select = selectAltClick;
            } else {
              select = null;
            }
            if (select !== null) {
              map.addInteraction(select);
              select.on('select', function(e) {
                document.getElementById('status').innerHTML = '&nbsp;' +
                    e.target.getFeatures().getLength() +
                    ' selected features (last operation selected ' + e.selected.length +
                    ' and deselected ' + e.deselected.length + ' features)';
              });
            }
          };

          /**
           * onchange callback on the select element.
           */
          selectElement.onchange = changeInteraction;
          changeInteraction();
        </script>
      </body>
    </html>