How to get style, symbol or color from a feature?

AndrewMurdoch1 — Thu, 03 Nov 2022 21:59:17 GMT

Good Day

I have a layer that which uses a valueExpression in the Unique Value Renderer to set it's style, giving me something like:

I'm running into a problem where I need to know what colours / uniqueValueInfo from the Unique Value Renderer was set on to the map. How can I get this information? I tried running a query:

queryAllFeatures(layer: FeatureLayer): Promise<Graphic[] | Error> { return new Promise((r, j) => { const query = { where: '1=1', outFields: ['*'], returnGeometry: true } layer.queryFeatures(query).then((queryRes) => { r(queryRes.features); }).catch((error) => { console.log(error); j(null); }) }); }

But I can't seem to find the information in the output? I would imagine it's trivial to get the style information form the layer. Ideally I'd like to get a list of all styles / colours that are active.

Is this possible?

Thanks

Re: How to get style, symbol or color from a feature?

JoelBennett — Fri, 04 Nov 2022 18:47:27 GMT

If I'm understanding your question properly, it seems to me that UniqueValueRenderer.getUniqueValueInfo is the key to what you're trying to do. For example:

layer.renderer.getUniqueValueInfo(someGraphic).then(function(uniqueValueInfo) { var symbol = uniqueValueInfo.symbol; //do whatever with the symbology for "someGraphic" here });

topic How to get style, symbol or color from a feature? in ArcGIS JavaScript Maps SDK Questions

How to get style, symbol or color from a feature?

Re: How to get style, symbol or color from a feature?