topic Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer? in ArcGIS JavaScript Maps SDK Questions

Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Sat, 11 Dec 2021 18:26:44 GMT

I currently have a featurelayer being queried, and the results placed in a graphicslayer ... I am hoping that the results can be placed in a new featurelayer instead?

Here is current code:

$("#radio-4").click(function() {                       //shows only January crimes
      var sr = new SpatialReference(102100);

      janResults = new GraphicsLayer();
      janResults.title = "January";
      map.add(janResults);
      var janQuery = featurelayer.createQuery(); 
                                                                                    
      janQuery.where = "Month = 'January'";
      janQuery.outFields = ["Offense" , "Location"];
      janQuery.returnGeometry = true;
      janQuery.outSpatialReference = sr;

      featurelayer.queryFeatures(janQuery).then(displayGraphics);
      
      function displayGraphics(results) {

            janResults.removeAll();

            for (feature of results.features) {
                  var janGraphic = new Graphic ({
                        geometry: feature.geometry,
                        symbol: {
                              type: "simple-marker",
                              color: "blue",
                              size: "20px",
                              outline: {
                                    color:"black",
                                    width: 2,
                              },
                        },
                  });
                  janResults.add(janGraphic);
            }

      }
     
});  //end of January query‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Sat, 11 Dec 2021 18:26:47 GMT

John,

Sure you just need to create the FL from the graphics array.

      var sRenderer = {
        type: "simple", // autocasts as new SimpleRenderer()
        symbol: {
          type: "simple-marker", // autocasts as new SimpleMarkerSymbol()
          size: "20px",
          color: "blue,
          outline: {
            width: 2,
            color: "black"
          }
        }
      };
      var graArr = [];
      var janQuery = featurelayer.createQuery(); 
                                                                                    
      janQuery.where = "Month = 'January'";
      janQuery.outFields = ["Offense" , "Location"];
      janQuery.returnGeometry = true;
      janQuery.outSpatialReference = sr;

      featurelayer.queryFeatures(janQuery).then(displayGraphics);

      function displayGraphics(results) {
        for (feature of results.features) {
          var janGraphic = new Graphic ({
            geometry: feature.geometry,
            attributes: {
              Offense: feature.attributes.Offense,
              Location: feature.attributes.Location
            }
          });
          graArr.push(janGraphic);
        }
        createLayer(graArr);
      }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

      function createLayer(graphics) {
        var fields = [{
          name: "ObjectID",
          alias: "ObjectID",
          type: "oid"
        }, {
          name: "Offense",
          alias: "Offense",
          type: "string"
        }, {
          name: "Location",
          alias: "Location",
          type: "string"
        }];
        layer = new FeatureLayer({
          title: "January",
          source: graphics,
          // create an instance of esri/layers/support/Field for each field object
          fields: fields, // This is required when creating a layer from Graphics
          objectIdField: "ObjectID", // This must be defined when creating a layer from Graphics
          renderer: sRenderer, // set the visualization on the layer
        });
        map.add(layer);
      }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 14:17:20 GMT

Thank you Robert ... I will give this a shot!

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 15:35:08 GMT

dojo.js:251 [esri.layers.FeatureLayer] #load() Failed to load layer (title: 'January', id: '166785b54b9-layer-0')

h {name: "feature-layer:missing-property", message: "FeatureLayer created as feature collection requires properties: geometryType,fields,objectIdField", details: {…}}
1. details:
  1. requiredProperties: (3) ["geometryType", "fields", "objectIdField"]
  2. __proto__: Object
2. message: "FeatureLayer created as feature collection requires properties: geometryType,fields,objectIdField"
3. name: "feature-layer:missing-property"
4. __proto__: b

I get the above error message in console ...

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Sat, 11 Dec 2021 18:26:50 GMT

John,

make this change:

        layer = new FeatureLayer({
          geometryType: "point",
          title: "January",
          source: graphics,
          // create an instance of esri/layers/support/Field for each field object
          fields: fields, // This is required when creating a layer from Graphics
          objectIdField: "ObjectID", // This must be defined when creating a layer from Graphics
          renderer: sRenderer, // set the visualization on the layer
        });
        map.add(layer);‍‍‍‍‍‍‍‍‍‍

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 16:53:53 GMT

Interestingly, no errors are thrown, the symbol for January shows up in the legend, the layer shows up as turned on in the layer list, but nothing is shown on the map!

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Mon, 15 Oct 2018 17:37:19 GMT

And when you were adding this as a graphics layer there where results right?

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 17:39:50 GMT

Yes, many

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Mon, 15 Oct 2018 17:54:57 GMT

John,

I was just guessing at the geometry type when I choose point. Is the data actually point data or some other geometry type?

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 18:04:46 GMT

It is point data, yes

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Sat, 11 Dec 2021 18:26:52 GMT

John,

Change the renderer to this:

      var sRenderer = {
        type: "simple", // autocasts as new SimpleRenderer()
        symbol: {
          type: "simple-marker", // autocasts as new SimpleMarkerSymbol()
          size: "20px",
          color: "blue",
          style: "circle",
          outline: {
            width: 2,
            color: "black"
          }
        }
      };‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 18:31:40 GMT

Still no go

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Mon, 15 Oct 2018 18:32:54 GMT

still no errors?

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 18:43:30 GMT

nope

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Mon, 15 Oct 2018 18:50:14 GMT

John,

David over in this thread just used the graphics directly from the query.

https://community.esri.com/thread/222737-can-the-results-of-a-query-be-placed-in-a-featurelayer-instead-of-a-graphicslayer?sr=inbox&ru=36214

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 18:54:34 GMT

How do you mean?

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Mon, 15 Oct 2018 18:56:48 GMT

look at that thread.

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 18:58:01 GMT

I tried, but the link took me to another version of my own thread

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

RobertScheitlin__GISP — Mon, 15 Oct 2018 19:06:03 GMT

Sorry, must have pasted wrong link:

https://community.esri.com/message/806137-re-querytask-result-to-a-feature-layer?commentID=806137#comment-806137

Re: Can the results of a query be placed in a FeatureLayer instead of a GraphicsLayer?

JohnRichardson — Mon, 15 Oct 2018 19:12:49 GMT

Robert ... after all of that, it was the spatial reference ... I had omitted the line at the top of my function that set the output spatial reference to 102100!