WMS GetFeatureInfo (Image Layer)


Using an image WMS source with GetFeatureInfo requests

This example shows how to trigger WMS GetFeatureInfo requests on click for a WMS image layer. Additionally map.forEachLayerAtPixel is used to change the mouse pointer when hovering a non-transparent pixel on the map.

<!DOCTYPE html>
    <title>WMS GetFeatureInfo (Image Layer)</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/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>

    <div id="map" class="map"></div>
    <div id="info">&nbsp;</div>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import ImageLayer from 'ol/layer/Image.js';
      import ImageWMS from 'ol/source/ImageWMS.js';

      var wmsSource = new ImageWMS({
        url: 'https://ahocevar.com/geoserver/wms',
        params: {'LAYERS': 'ne:ne'},
        serverType: 'geoserver',
        crossOrigin: 'anonymous'

      var wmsLayer = new ImageLayer({
        source: wmsSource

      var view = new View({
        center: [0, 0],
        zoom: 1

      var map = new Map({
        layers: [wmsLayer],
        target: 'map',
        view: view

      map.on('singleclick', function(evt) {
        document.getElementById('info').innerHTML = '';
        var viewResolution = /** @type {number} */ (view.getResolution());
        var url = wmsSource.getGetFeatureInfoUrl(
          evt.coordinate, viewResolution, 'EPSG:3857',
          {'INFO_FORMAT': 'text/html'});
        if (url) {
          document.getElementById('info').innerHTML =
              '<iframe seamless src="' + url + '"></iframe>';

      map.on('pointermove', function(evt) {
        if (evt.dragging) {
        var pixel = map.getEventPixel(evt.originalEvent);
        var hit = map.forEachLayerAtPixel(pixel, function() {
          return true;
        map.getTargetElement().style.cursor = hit ? 'pointer' : '';