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I am able to fetch the getGetFeatureInfoUrl for the currently selected layer, is it possible to fetch the last added layer FeatureInfo on the map?

My code currently is:

<!DOCTYPE html>
<html>
  <head>
    <title>WMS GetFeatureInfo (Tile Layer)</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v3.19.1/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/v3.19.1/build/ol.js"></script>
    <script type="text/javascript" src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
  </head>
  <body>
    <div class="form-group">
      <label>Disaster</label>
      <select id="dict" class="form-control" onchange="loadfloodlayer(this.id);">
        <option>Select disaster</option>
        <option value="guntur">guntur</option>
        <option value="krishna">krishna</option> 
        <option value="prakasam">prakasam</option>
      </select>
    </div>
    <div id="map" class="map"></div>
    <div id="info">&nbsp;</div>
    <div id="info2">&nbsp;</div>
    <script>
      var wmsSource = new ol.source.TileWMS( {
        url: 'http://ndem.nrsc.gov.in/geoserver/wms',
        params: {'LAYERS': 'ndem50k:stateadmin50census2011'}
      });
      var wmsLayer = new ol.layer.Tile({
        source: wmsSource
      });
      var mapcenter = [79.60,23.44];
      var view = new ol.View({
        projection: 'EPSG:4326',
        center: mapcenter,
        zoom: 5,
        extent: [66.2329, 7.68083, 98.2223, 39.03874],
        maxZoom:16,
        minZoom: 4
      });
      var map = new ol.Map({
        layers: [wmsLayer],
        target: 'map',
        view: view
      });
      function loadfloodlayer(idd1) {
        hint = "manjula:";
        hitn = hint + $('#dict').val();
        alert(hitn);
        var  railvar = new ol.source.TileWMS({
            url: 'http://localhost:8089/geoserver/manjula/wms',
            params: {LAYERS: hitn}
        });
        var wmsLayer = new ol.layer.Tile({
        source: railvar
      });
      map.on('singleclick', function(evt) {
        document.getElementById('info').innerHTML = '';
        document.getElementById('info2').innerHTML = '';
        var viewResolution = /** @type {number} */ (view.getResolution());
        var url2 = wmsSource.getGetFeatureInfoUrl(
          evt.coordinate, viewResolution, 'EPSG:4326',
          {'INFO_FORMAT': 'text/html'});
          var url = railvar.getGetFeatureInfoUrl(
            evt.coordinate, viewResolution, 'EPSG:4326',
            {'INFO_FORMAT': 'text/html'});
          if (url) {
            document.getElementById('info').innerHTML =
            '<iframe style="width:100%;height:100%;" src="' + url + '"></iframe>';
          }
          if (url2) {
            document.getElementById('info2').innerHTML =
            '<iframe style="width:100%;height:100%;" src="' + url2 + '"></iframe>';
          }
      });
      map.on('pointermove', function(evt) {
        if (evt.dragging) {
          return;
        }
        var pixel = map.getEventPixel(evt.originalEvent);
        var hit = map.forEachLayerAtPixel(pixel, function() {
          return true;
        });
        map.getTargetElement().style.cursor = hit ? 'pointer' : '';
      });
      map.addLayer(wmsLayer); 
      }  
    </script>
  </body>
</html>
  • Do you mean layers that are in the same WMS service, or layers that are in different services? – nmtoken Jan 4 '17 at 18:11
1

I am able to fetch the getGetFeatureInfoUrl for the currently selected layer, is it possible to fetch the last added layer FeatureInfo on the map?

If the layers are from the same service then yes; in any GetFeatureInfo request you can return information from more the one layer, the QUERY_LAYERS parameter defines the layers to be queried, so it's either a single layer name or a list of layer names (separated by a comma).

So for the current map (the result of a GetMap request) in your OpenLayers client you can make a GetFeatureInfo request for the layer shown, for another layer (the previous layer), or indeed for multiple layers.

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