Identify Task only works on a MapServer?

JakeErickson — Fri, 28 Feb 2020 21:19:46 GMT

I am working on Javascript code to use the IdentifyTask to query against a parcel that is clicked to display info about the parcel.

I have been trying to get the Identify Task to work with a Feature Server: https://services1.arcgis.com/Rlvx5g8pKeK13apH/ArcGIS/rest/services/CountyParcels/FeatureServer , though I cannot get it to work.

However I am able to make the Identify Task work on a Map Server: https://mcmap2.montrosecounty.net/arcgis/rest/services/MontroseCOeagle/MapServer

I did a little bit of searching online and found that maybe Feature Servers do not support Identity Tasks?

don't use identify task with feature layer

I wanted clarification on this and if there was a way to query against a parcel that is clicked for a Feature Server?

I also found these that are maybe relevant to querying against a feature server?

ImageServiceIdentifyTask | ArcGIS API for JavaScript 4.14

ImageServiceIdentifyParameters | ArcGIS API for JavaScript 4.14

Thank you very much for your response!!!

Re: Identify Task only works on a MapServer?

JakeErickson — Fri, 28 Feb 2020 22:02:19 GMT

For reverence here is my Javascript code:

<html>

<head>
<meta name="description" content="ArcGIS JavaScript Tutorials: Query a feature layer">
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Account ArcGis View</title>
<style>
    html,
    body,
    #viewDiv {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
    }
</style>
<link rel="stylesheet" href="https://js.arcgis.com/4.11/esri/css/main.css">

    var layerUrl = getParcelLayerUrl();
    //needed for the identify task
    var mapServerUrl = getMapServerUrl();
   var parcelName = getParcelName();
   var parcelNumber = getParcelNum();
   var sql = parcelName + " = '" + parcelNumber + "'";
   var arrayOfColors = getOutlineColor().split(",");
   //identifyTask variables
   var identifyTask, params;

      var view = new MapView({
        container: "viewDiv",
        map: map,
        center: [-112.500, 37.0000],
        zoom: 7
      });

      var featureLayer = new FeatureLayer({
        url: layerUrl,
        //this is needed to return all fields when querying this feature view
        //this is the key to get zooming to the highlighted parcel to work!
        outFields: ["*"]
      });
      map.add(featureLayer, 0);

        function queryFeatureLayer(sqlExpression) {
          var query = featureLayer.createQuery();

          //these two are required for zooming to work!
          query.where = sqlExpression;
          query.outSpatialReference = view.spatialReference;


          featureLayer.queryFeatures(query).then(function (result) {
            addGraphics(result, true);
          });
        }

      view.when(function () {
        queryFeatureLayer(sql);

        view.on("click", executeIdentifyTask);

// Create identify task for the specified map service
identifyTask = new IdentifyTask(mapServerUrl);

        // Set the parameters for the Identify
        params = new IdentifyParameters();
        params.tolerance = 3;
        params.layerIds = [47];
        params.layerOption = "top";
        params.width = view.width;
        params.height = view.height;

});

      //identify task
      function executeIdentifyTask(event) {
       // Set the geometry to the location of the view click
          console.log("Layer Clicked");
          params.geometry = event.mapPoint;
          params.mapExtent = view.extent;
          document.getElementById("viewDiv").style.cursor = "wait";

          // This function returns a promise that resolves to an array of features
          // A custom popupTemplate is set for each feature based on the layer it
          // originates from
          identifyTask
            .execute(params)
            .then(function(response) {
              var results = response.results;
               console.log("Results: " + results);
              return results.map(function(result) {
                var feature = result.feature;
                var layerName = result.layerName;
                        console.log("features: " + feature.attributes);
                feature.attributes.layerName = layerName;
                if (layerName === "Parcel Line") {
                  feature.popupTemplate = {
                    // autocasts as new PopupTemplate()
                    title: "Parcel Information",
                    content:
                       //hard coded values for now
                      "<b>Account Number:</b> {ACCOUNTNO}" +
                      "<br><b>Parcel Number:</b> {" + parcelName + "}" +
                      "<br><b>Owner:</b> {NAME}" +
                      "<br><b>Address:</b> {FULL_ADD}" +
                      "<br><b>City:</b> {CITY}" +
                      "<br><b>Zip Code:</b> {ZIPCODE}" +
                      "<br><b>Legal Description:</b> {LEGAL}"
                  };
                }
                return feature;
              });
            })
            .then(showPopup); // Send the array of features to showPopup()

          // Shows the results of the Identify in a popup once the promise is resolved
          function showPopup(response) {
            if (response.length > 0) {
              view.popup.open({
                features: response,
                location: event.mapPoint
              });
            }
            document.getElementById("viewDiv").style.cursor = "auto";
          }
      }
    });
</script>
</head>

Re: Identify Task only works on a MapServer?

ReneRubalcava — Fri, 28 Feb 2020 22:18:50 GMT

Identify is a Map Service or Image Service operation.

For a FeatureService in the 4x API, you can query directly against the FeatureLayer like this sample, or query the features on the client with the LayerView like this sample.

Re: Identify Task only works on a MapServer?

JakeErickson — Fri, 28 Feb 2020 22:54:18 GMT

Yes, thank you Rene. This is what I found as well. When I have a FeatureLayer, it makes much more sense to just query against that since we have a geometry. I misunderstood the purpose/need to use an identify task.

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Identify Task only works on a MapServer?

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Re: Identify Task only works on a MapServer?