Field aliases not available for custom popup content?

Question

JS API version 4.12 I'm generating my own custom popup content, specific to each sublayer in my map image layer. I don't want to hard code dozens of fields in 40+ layers like this: content: "Utility ID: {UtilityID}‍"‍‍ It's going to be more of a custom template with some functions applied to common fields throughout many layers. When creating a function for the sublayer.popupTemplate's content, the only thing I have available in the graphic's attributes are field names. Can I not easily get the aliases for these features? I don't see a more direct way to do this aside from a traversing through the metadata of the entire map image layer using an esriRequest...get layer field name/alias pairs into an array. Can I avoid the overhead of an esriRequest? // Create identify task for the specified map service var identifyTask = new IdentifyTask(app.mapImgLyrUtil.url); // Set the parameters for the Identify var params = new IdentifyParameters(); params.tolerance = 10; params.layerOption = "visible"; params.width = app.mapView.width; params.height = app.mapView.height; const arrExcludeFields = ["OBJECTID", "SHAPE", "SHAPE.STLENGTH()"]; function executeIdentifyTask(event) { params.geometry = event.mapPoint; params.mapExtent = app.mapView.extent; identifyTask .execute(params) } app.mapView.on("click", executeIdentifyTask); app.mapView.popup = { dockEnabled: true, collapseEnabled: false, overwriteActions: true, defaultPopupTemplateEnabled: true, dockOptions: { position: "bottom-right" } }; function createContent(content) { var graphic = content.graphic; //graphic's attributes are FIELDNAME: {value} var displayContent = ""; for (var key in graphic.attributes) { //key is the field name if (arrExcludeFields.indexOf(key.toUpperCase()) == -1) { var attrVal = ""; if (graphic.attributes[key]) { attrVal = graphic.attributes[key]; } displayContent += key + ": " + attrVal + "
"; } } return displayContent; } app.mapImgLyrUtil.allSublayers.map(function (sublayer) { sublayer.popupTemplate = new PopupTemplate({ outFields: ["*"], content: createContent, title: sublayer.name }); return sublayer; });‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Andy_Morgan · Accepted Answer

Ben, I don't know of a way to use Arcade in a generic sense to retrieve field aliases. Can I avoid having to hard code every single field name ($feature.UtilityID, $feature.ProjectName, $feature.InstalledDate, etc...)? Hard coding expressions with specific field names for dozens of layers is out of the question. I was just looking for a more efficient way to translate field names to field aliases while establishing my popup templates for each of the layers. Here's my current solution, as mentioned above, using a request against the service and building a dictionary. var arrLayerFields = {}; esriRequest(app.mapImgLyrUtil.url + "/layers?f=json").then(function (response) { var layerInfos = response.data.layers; layerInfos.forEach(function (lyr) { if (lyr.type == "Feature Layer") { var arrFieldInfos = lyr.fields; arrFieldInfos.forEach(function (fieldInfo) { delete fieldInfo.type; // \ delete fieldInfo.length; // } Don't need these field properties delete fieldInfo.domain; // / }); arrLayerFields[lyr.name] = arrFieldInfos; } }); });‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ //creates an object of layers with an array of fields (name and alias properties)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍