Multiple ArcGISDynamicMapServiceLayer IdentifyTask

LoriEmerson_McCormack — Thu, 01 Jun 2017 23:04:57 GMT

I used the sample cleverly written in post Identify Sample and modified it by setting visible layers for only a few layers in each map service. However, when I click on the map, the identify brings up results for all the layers I clicked on even though they are not visible in the map.

In this code snippet, the layer.visibleLayers[0] = 0,33,38,13. Can someone explain those results?

function mapReady(map) {
dojo.connect(map, "onClick", runIdentifies);
pointsLayer.setVisibleLayers([33]);
linesLayer.setVisibleLayers([38, 44]);
polygonsLayer.setVisibleLayers([13, 27, 53, 62, 83]);
}

...

layers = dojo.filter(layers, function (layer) {
if (layer.visibleLayers[0] !== -1) {
return layer.getImageUrl && layer.visible
}

Can someone help me understand how multiple map services are handled in the identify task? For a single map service, the identifyParams.layerIds is set to the index values of the layers to identify. For multiple map services, is the identifyParams.layerIds set to the map url AND the index of the layer? How does the IdentifyTask know which index belongs with which map service?

Thank you.

Re: Multiple ArcGISDynamicMapServiceLayer IdentifyTask

KenBuja — Fri, 02 Jun 2017 13:22:38 GMT

Were those the only changes you made to the code? If not, can you post your full script?

Re: Multiple ArcGISDynamicMapServiceLayer IdentifyTask

LoriEmerson_McCormack — Fri, 02 Jun 2017 17:44:49 GMT

<!DOCTYPE html>

<html>
<head>

var map;
var identifyTask, identifyParams, idPoint;
var identifyResults;

require([
"esri/map", "esri/dijit/Popup", "dojo/promise/all", "dojo/domReady!"
], function (
Map, Popup, All
) {
var popup = new Popup({
fillSymbol: new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255, 0, 0]), 2), new dojo.Color([255, 255, 0, 0.25]))
}, dojo.create("div"));

map = new Map("map", {
basemap: "satellite",
center: [-117.42330, 47.751103],
zoom: 16,
infoWindow: popup
});

dojo.connect(map, "onLoad", mapReady);

//var landBaseLayer = new esri.layers.ArcGISDynamicMapServiceLayer("http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/BloomfieldHillsMichigan/Parcels/MapServer", { opacity: .55 });
//map.addLayer(landBaseLayer);

//var militaryLayer = new esri.layers.ArcGISDynamicMapServiceLayer("http://sampleserver6.arcgisonline.com/arcgis/rest/services/Military/MapServer", { opacity: .55 });
//map.addLayer(militaryLayer);
//console.log(militaryLayer.declaredClass);

var pointsURL = "http://igis.spokanecounty.org/arcgis/rest/services/PublicWorks/PublicWorksQueriesPoints/MapServer";
var linesURL = "http://igis.spokanecounty.org/arcgis/rest/services/PublicWorks/PublicWorksQueriesLines/MapServer";
var polygonsURL = "http://igis.spokanecounty.org/arcgis/rest/services/PublicWorks/PublicWorksQueriesPolygons/MapServer";

var promises = [];

for (i = 0; i < tasks.length; i++) {
promises.push(tasks.execute(params)); //Execute each task
}

var allPromises = new All(promises);
allPromises.then(function (r) { showIdentifyResults(r, tasks); });
}

var idTemplate = new esri.InfoTemplate;
//var idTemplate = new esri.InfoTemplate("", "Service Url: " + serviceUrl + "<br/><br/>Layer name: " + result.layerName + "<br/><br/> Object Id: ${OBJECTID}");
//feature.setInfoTemplate(idTemplate);

switch (layerName) {
case "Parcels":
idTemplate.setContent("<b>PID_NUM</b>: ${PID_NUM}" +
"</br><b>owner_name:</b> ${owner_name}");
idTemplate.setTitle(layerName);
break;
default:
idTemplate.setTitle(layerName);
break;

} // end switch stmt
feature.setInfoTemplate(idTemplate);

var resultGeometry = feature.geometry;
var resultType = resultGeometry.type;
return feature;
});

if (results.length === 0) {
map.infoWindow.clearFeatures();
} else {
map.infoWindow.setFeatures(results);
}
map.infoWindow.show(idPoint);
return results;
}

});
</script>

</head>

Re: Multiple ArcGISDynamicMapServiceLayer IdentifyTask

KenBuja — Sat, 11 Dec 2021 18:31:40 GMT

Your alert message was just showing the first item in the array of visibleLayers

alert(layer.visibleLayers[0]);
‍‍

If you change it to this, it will show all the visible layers in that layer

alert(layer.visibleLayers);‍

Re: Multiple ArcGISDynamicMapServiceLayer IdentifyTask

LoriEmerson_McCormack — Fri, 02 Jun 2017 22:36:47 GMT

Ah, that makes sense. Thank you.

Why does the code then go on and take forever for the identify popup to appear? Why does the identify popup display all layers that were clicked at a point on the map, and not just the visible layers?

Re: Multiple ArcGISDynamicMapServiceLayer IdentifyTask

LoriEmerson_McCormack — Mon, 05 Jun 2017 20:35:49 GMT

The reason the ShowIdentifyResults was taking so long to display on the map was because it was creating results for all layers in each of the dynamic map service layers.

To only ShowIdentifyResults for the visible layers, I modified the createIdentifyParams function with this:

var visLayers = layer.visibleLayers;
if (visLayers !== -1) {
   var subLayers = [];
   for (var i = 0; i < visLayers.length; i++) {
      subLayers.push(visLayers);
   } // end for stmt

alert("idParams.layerIds=" + subLayers);
idParams.layerIds = subLayers;
} else {
idParams.layerIds = [];
}

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