topic Re: How to edit a graphic, or query a GraphicsLayer? in ArcGIS JavaScript Maps SDK Questions

How to edit a graphic, or query a GraphicsLayer?

Sparkles — Mon, 21 Oct 2024 20:54:00 GMT

I'm trying to allow the user to edit a graphic (to drag the points on a polyline) by clicking on it - I'm using GraphicsLayer. https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/can-graphics-layers-be-queried/td-p/613949On this post, I read that queryFeatures are not available on GraphicsLayer, and in order to query it, you have to convert the GraphicsLayer into a FeatureLayer.

I tried the solution from that past, with this code:
```

let layer = new FeatureLayer({

source: tracksLayer.graphics._items,

objectIdField: "ObjectID"

});

arcgisView.whenLayerView(layer).then(function (lyrView) {

console.log(lyrView)

lyrView.watch("updating", function (val) {

if (!val) { // wait for the layer view to finish updating

lyrView.queryFeatures().then(function (results) {

console.log(results); // prints all the client-side graphics to the console

});

}

});

})

```

And I get the following error:
```{name: 'view:no-layerview-for-layer', details: {…}, message: 'No layerview has been found for the layer'}```

I'm not sure if using tracksLayer.graphics._items was correct. tracksLayer is my GraphicsLayer.
Also, I'm not sure of the use of objectIdField: "ObjectID" (I got that from the documentation).

Is there something I'm missing? Or is there another way to allow the user to edit the points on a polyline (in GraphicsLayer?) without being able to query it? This approach of having to change a GraphicsLayer to a FeatureLayer seems too complex, and maybe I should just redo everything and create a FeatureLayer from the start?

Thanks so much for the help!

Re: How to edit a graphic, or query a GraphicsLayer?

JohnGrayson — Tue, 22 Oct 2024 15:41:16 GMT

Check out the section called "Add an array of client-side features" in the expand section called "Creating a FeatureLayer" in this help doc. Also, check out the 'dataUpdating' property of the FeatureLayerView.

Re: How to edit a graphic, or query a GraphicsLayer?

Sparkles — Wed, 23 Oct 2024 17:22:40 GMT

Hi @JohnGrayson , thanks for your response! Are you referring to this portion?

let features = [ { geometry: { type: "point", x: -100, y: 38 }, attributes: { ObjectID: 1, DepArpt: "KATL", MsgTime: Date.now(), FltId: "UAL1" } }, ... ]; // geometryType and spatialReference of the layer // will be inferred from the first feature in the array // if it has a geometry. let layer = new FeatureLayer({ source: features, // autocast as a Collection of new Graphic() objectIdField: "ObjectID" });

This is what I was looking at as an example for my code. Instead of making a custom features array in the example, I just used tracksLayer.graphics._items (as that's what had my real data). Would I have to convert my data into that format? Thanks!