topic Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x in ArcGIS JavaScript Maps SDK Questions

FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

Mr_Kirkwood — Fri, 13 Sep 2024 17:03:30 GMT

I am new to the JS 4.x language. The JS 3.x had the modes. These helped with queries where you could zoom into a FeatureLayer and have it turn on when zoomed to. The Featurelayer doesnt show up when using MODE_SELECTION until it was queried and selected. Here is an exapmple of the 3.x code:

floorOutline = new FeatureLayer (urlFloorOutline, { mode: FeatureLayer.MODE_SELECTION, id: 'floorOutline', outFields: ["*"], opacity: 0.8, });

This was added t othe map and did not show up on the map until you ran the zoom to fucntion:

How do i do something similar with JS 4.x? I have some code to zoom to the feature but it is visible when the map is loaded and i just want show the quereied floor.

Thanks for any help.

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

JoelBennett — Fri, 13 Sep 2024 17:16:33 GMT

If you're just wanting to show a particular set of features at any given time, and know the objectID values of that set, then using definitionExpression would be one way to do so:

function hideLayerFeatures(featureLayer) { featureLayer.definitionExpression = "1=0"; } function showLayerFeatures(featureLayer, ids) { if (Array.isArray(ids)) featureLayer.definitionExpression = featureLayer.objectIdField + " IN(" + ids.join(",") + ")"; else if (typeof ids == "number") featureLayer.definitionExpression = featureLayer.objectIdField + " = " + ids.toString(); }

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

Mr_Kirkwood — Mon, 16 Sep 2024 16:59:52 GMT

I already have some code to grab the OBJECTID. How do I get the layer to turn on to the queried OBJECTID when I zoom to the Feature? I have set the visibility for the whole layer to "false"

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

JoelBennett — Mon, 16 Sep 2024 17:17:46 GMT

On line 25 of your 4.x code you have this to zoom to the feature:

view.goTo (geometry);

If you want to make the layer visible after zooming, you can change that line to the following:

view.goTo(geometry).then(function() { floorOutline.visible = true; });

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

Mr_Kirkwood — Mon, 16 Sep 2024 17:22:14 GMT

That worked. Thank you so much for your help.

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

Mr_Kirkwood — Mon, 16 Sep 2024 20:29:59 GMT

Thanks again. Here is my updated code snippet:

How would this work with an array of OBJECTIDs? My JS 3.x looks like this:

I am having trouble updating it to 4.x

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

Mr_Kirkwood — Mon, 16 Sep 2024 20:34:39 GMT

I tried something like this: function zoomRoomUse (ids) { require ([ "esri/rest/query", "esri/rest/support/Query", "esri/layers/FeatureLayer", "esri/views/layers/LayerView" ], function (query, Query, FeatureLayer, LayerView) { console.log ("zoomFloorOutline"); roomsUseLayer.definitionExpression = roomsUseLayer.objectIdField + " IN(" + ids.join(",") + ")"; console.log (roomsUseLayer.definitionExpression) console.log(ids) view.whenLayerView (roomsUseLayer).then (function (layerView) { var query = roomsUseLayer.createQuery (); query.objectIds = [ids]; query.where = "1=1"; roomsUseLayer.queryFeatures (query).then (function (results) { const features = results.features; var geometry = features[0].geometry.extent.clone (); for (var k = 0; k < features.length; k++) { geometry = geometry.union (features[k].geometry.extent.clone ()); view.goTo (geometry).then (function () { roomsUseLayer.visible = true; }); } }); }); }); }

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

JoelBennett — Mon, 16 Sep 2024 20:47:53 GMT

On line 21, instead of:

query.where = "1=1";

I think you need this instead:

query.where = roomsUseLayer.definitionExpression;

Or better yet, you could remove line 21 altogether, because according to the documentation for createQuery, the "where" setting should already be set according to the definitionExpression. Setting it to "1=1" would overwrite that and return all features in the layer.

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

Mr_Kirkwood — Thu, 21 Aug 2025 21:19:38 GMT

I am trying to zoom to a group of queried points but the above code is getting an error.

Uncaught (in promise) TypeError: Cannot read properties of null (reading 'clone')

at this point in the code

var geometry = features[0].geometry.extent.clone ();

Is there somethung different with zooming to points?

Re: FeatureLayer modes (MODE_SELECTION and MODE_ONDEMAND) for JS 4.x

JoelBennett — Fri, 22 Aug 2025 00:40:18 GMT

As seen in the documentation, point objects don't have an extent (the value of their extent property is null). You might want to built a single MultiPoint object from the points returned by your query and zoom to it instead.