No results for identify task on visible grouped layers

AndyMorgan1 — Sun, 12 Dec 2021 05:43:33 GMT

My application loads multiple map services, and within two of the services there are grouped layers (created in ArcMap). Is it possible to return identify results for sublayers under a grouped layer, when not visible by default?

For example see below, or image attached:

Water Layers (= map service level)
- Water Valve
- Water Fire Hydrant
- Water Abandoned/Removed (= layer group, not visible by defaul)
     - Fire Hydrant (A/R)
     - Water Valve (A/R)
     - Water Line (A/R)
- Water Line

Using the "LAYER_OPTION_VISIBLE" layerOption doesn't work. The "Water Abandoned/Removed" group layer is not visible by default from the mxd settings, so users must make it visible by checking it on the TOC/Legend (widget by NLiu). With this group layer and all sublayers checked, and when zoomed to a visible scale range, no results are found.

I tried applying your code above with no success either.

My identify code is rather long, as I built a custom info window, but here's where I set the currently visible layers upon map "click" event. It passes the correct ID's into the array [8,9,10] which equate to Fire Hydrant (A/R), Water Valve (A/R), and Water Line (A/R). But Identify Task does not produce any results for these three layers. It only works if I use LAYER_OPTION_ALL, but then I have the obvious problem of returning results from layers not currently visible.

function buildCurrentMapServiceLayerList(serviceLayer) {
             var lyrInfos = {};
             var hasVisibleLayers = false;
             dynamicLayerInfos = serviceLayer.createDynamicLayerInfosFromLayerInfos();
             array.forEach(dynamicLayerInfos, function (info) {
                 var i = {
                     id: info.id,
                     name: info.name
                 };
                 if (array.indexOf(serviceLayer.visibleLayers, info.id) > -1) {
                     i.visible = true;
                     hasVisibleLayers = true;
                 }
                 else {
                     i.visible = false;
                 }
                

                 if (!info.subLayerIds) {
                     lyrInfos[info.id] = i;
                 }
             });
             if (hasVisibleLayers === true) {
                 mapServiceInfos[serviceLayer.id] = lyrInfos;
             }
         }

Then, to create parameters and execute identify task...

                var serviceName = mapServiceInfos[idxName];
                 for (var idxLayer in serviceName) {   //loop through layers within the current map service 
                     var layer = serviceName[idxLayer];
                     if (layer.name.toUpperCase().indexOf("LABEL") == -1 && layer.visible == true) {
                         layersToIdentify.push(layer.id);
                     }
                 }

                 identifyParams.layerIds = layersToIdentify;
                 identifyParams.tolerance = 8;
                 identifyParams.returnGeometry = true;
                 identifyParams.layerOption = IdentifyParameters.LAYER_OPTION_VISIBLE;
                 identifyParams.width = map.width;
                 identifyParams.height = map.height;
                 identifyParams.geometry = event.mapPoint;
                 identifyParams.mapExtent = map.extent;
                 if (layersToIdentify.length > 0) {
                     var idDeferred = identifyTask.execute(identifyParams, function (idResults) {
                         processIdentifyResults(idResults, event);
                     });
                 }

(Using js api 3.10 against ArcGIS Server 10.0 services, soon to upgrade to 10.2.2)

Re: No results for identify task on visible grouped layers

AndyMorgan1 — Sun, 12 Dec 2021 05:43:36 GMT

Update: I found a solution.

It was hard to reproduce this issue with any other 10.02 map service / JS API 3.10 combination. However, I used LAYER_OPTION_ALL combined with this function below to guarantee I will only identify against currently visible layers at the current map scale.

The scale range was the key here.

           function visibleAtCurExtent(layerInfo) {


                 isVisible = false;
                 //First criteria: must be a layer that is checked as visible;  this doesn't guarantee it's visible at the current map extent
                 if (array.indexOf(serviceLayer.visibleLayers, layerInfo.id) > -1) {
                     var mapScale = map.getScale();  // initial: 288,000
                     var layerMinScale = layerInfo.minScale;  //fittings: min=1000, max=0
                     var layerMaxScale = layerInfo.maxScale;
                     //If layer has no min/max scale range, or currently above min scale range and no max scale or below max scale range, it is visible
                     if ((layerMinScale === 0 && layerMaxScale === 0) || (layerMinScale >= mapScale && (layerMaxScale === 0 || layerMaxScale <= mapScale))) {
                         isVisible = true;
                     }
                 }
                 return isVisible;
             }

Then, apply when looping through DynamicLayerInfos:

          array.forEach(dynamicLayerInfos, function (info) {

                 var blnVisAtCurExt = visibleAtCurExtent(info);
               ......

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No results for identify task on visible grouped layers

Re: No results for identify task on visible grouped layers