When export task sends dynamicLayers parameter?

daltvr — Wed, 28 Aug 2024 22:42:09 GMT

Hello,

I have some ambiguities when working with MapImageLayers, sublayers and dynamicLayers. I have map image layer with dynamicLayers support but I don't want use it. I don't want show all layers from map service, so I provide sublayers parameter with desired layers to MapImageLayer with only visibility flag.

But sometimes during export task client sends in export task parameter layers=show:... and sometimes dynamicLayers={...json with defs...}. Same behavior in ESRI sample: https://codepen.io/dalasek/pen/BagPmKQ?editors=1000. See the network tab in Chrome developer tools, click butons in different orders and check behavior of export task request.

Steps:

1. click to Cities (layers: show:0)
2. click to Highways (layers: show:0,1)
3. click to Railroads (dynamicLayers: [{"id":4,"source":{"type":"mapLayer","mapLayerId":4}}]) ---WHY???
4. click to States (again dynamicLayers...)

const layer = new MapImageLayer({ url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer", sublayers: [ { id: 4, visible: false, }, { id: 2, visible: false }, { id: 1, visible: false }, { id: 0, visible: false } ] });

Question: What is the key of how the parameter layers and dynamicLayers are set based on sublayers defs?

Thanks!

//Dalibor

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When export task sends dynamicLayers parameter?