topic Re: Select multiple layers and export in ArcGIS JavaScript Maps SDK Questions

Select multiple layers and export

Vakhtang_Zubiashvili — Fri, 23 Dec 2022 11:20:27 GMT

Hi Guys,

On my map i want to select multiple layers by drawing rectangle and than export selected features fields. i have this code thanks to @BlakeTerhune (From my previous topic😞

// create a new sketch view model set its layer const sketchViewModell = new SketchViewModel({ view: view, layer: polygonGraphicsLayerr }); // Once user is done drawing a rectangle on the map // use the rectangle to select features on the map and table sketchViewModell.on("create", async (event) => { if (event.state === "complete") { // this polygon will be used to query features that intersect it const geometriess = polygonGraphicsLayerr.graphics.map(function(graphic){ return graphic.geometry }); const queryGeometry = await geometryEngineAsync.union(geometriess.toArray()); selectFeatures(queryGeometry); } }); // This function is called when user completes drawing a rectangle // on the map. Use the rectangle to select features in the layer and table function selectFeatures(geometry) { // create a query and set its geometry parameter to the // rectangle that was drawn on the view var query = { geometry: geometry, outFields: ["*"] }; map.allLayers.forEach(layer => { // Query all layers data layer.queryFeatures(query) .then((results) => { // do something with query results console.log(results) }) .catch(errorCallback); }); };

When i draw rectangle in logs i get error: layer.queryFeatures is not a function;

what i do wrong? What is wrong here and i can not see? Help

Re: Select multiple layers and export

JoelBennett — Fri, 23 Dec 2022 16:23:02 GMT

Your code is assuming that all layers in your map are FeatureLayers, but that is unlikely. You should therefore check the layer type before trying to execute a query on it. One simple check would be like so:

map.allLayers.forEach(layer => { // Query all layers data if (typeof layer.queryFeatures == "function") { layer.queryFeatures(query).then((results) => { // do something with query results console.log(results) }).catch(errorCallback); } });

Re: Select multiple layers and export

LefterisKoumis — Fri, 23 Dec 2022 16:35:15 GMT

JoelBennett is correct.

map.allLayers.forEach(layer => { // Query all layers data if (layer.type === "feature" && layer.visible){ layer.queryFeatures(query) .then((results) => { // do something with query results console.log(results) }) .catch(errorCallback); } });

Re: Select multiple layers and export

Vakhtang_Zubiashvili — Sat, 24 Dec 2022 19:53:06 GMT

Thank You guys @JoelBennett @LefterisKoumis , both code works fine, simply checking layer type 😉 Thanks again for help.