topic Re: Use Feature Layer Attribute as GP Service Input in ArcGIS JavaScript Maps SDK Questions

Use Feature Layer Attribute as GP Service Input

LloydBronn — Sun, 12 Dec 2021 05:02:39 GMT

I'm trying to click on a country layer and use the country name as input for a GP tool. I've done this with XY inputs from map clicks, but I'm having a lot of trouble getting the attribute from a feature. Do I need a query task? Here is my code snippet. When I add content to the infoWindow, it displays "Country: ${NAME}" so it's not pulling that attribute from the feature layer correctly.

var country = {};

var countriesLayer = new FeatureLayer("http://<ourserver>/arcgis/rest/services/Countries_Outline/MapServer/1");
          
          map.addLayer(countriesLayer);
          
          var content = "<b>Country</b>: ${NAME}";
              
          map.on("click", function(evt){
                         
          map.graphics.clear();
          var graphic = new Graphic(evt.mapPoint);
            
          map.graphics.add(graphic);
          map.infoWindow.setFeatures([graphic]);
            
            map.infoWindow.resize(200,200);     
          map.infoWindow.setContent(content);
          map.infoWindow.show(evt.mapPoint)
            map.infoWindow.setTitle("Forecast Reports");
            
        }); 
          
            
            var today = new Date();
            var todayISO = today.toISOString().slice(0,10).replace(/-/g,"");
            
            var link = domConstruct.create("a",{
                "class": "action", 
                "id": "reportLink",
                "innerHTML": "Forecast Report", //text that appears in the popup for the link 
                "href": "javascript: void(0);"
              }, query(".actionList", map.infoWindow.domNode)[0]);
          on(link, "click", function(){
            
            domAttr.set(dom.byId("reportLink"), "innerHTML", "Generating Report...");
            
            window.gp_chart = new Geoprocessor("http://<ourserver>/arcgis/rest/services/Generate_Forecast_Report/GPServer/CreateReport");
               
               var country = window.map.infoWindow.getSelectedFeature();
                
              var taskParams = {
                "Country":country
              };
                 
              //window.gp_chart.execute(taskParams,gpChartResultAvailable,gpChartFailure);
                 window.gp_chart.execute(taskParams);‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 19:30:02 GMT

Lloyd,

You have the selected feature so you just have to get the attribute fro the selected feature:

var country = window.map.infoWindow.getSelectedFeature().attributes["country"];‍‍

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Mon, 06 Mar 2017 20:00:58 GMT

OK. I keep getting this error: "Cannot read property 'Country' of undefined at HTMLAnchorElement.<anonymous>"

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 20:40:13 GMT

What is the line of code that is throwing this error?

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Mon, 06 Mar 2017 20:46:40 GMT

This line. The attribute is called "NAME".

var country = window.map.infoWindow.getSelectedFeature().attributes["NAME"];‍‍‍

I also added this for the display and it threw the same error:

var country = countriesLayer.attributes["NAME"];‍‍

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 20:51:31 GMT

Lloyd,

So is

window.map.infoWindow.getSelectedFeature();

defined (i.e. not null).

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Mon, 06 Mar 2017 20:56:51 GMT

Yes, it's defined "country."

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 21:02:41 GMT

Lloyd,

window.map.infoWindow.getSelectedFeature();

Should return a Graphic object...? Not a string.

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Mon, 06 Mar 2017 21:06:28 GMT

OK, I'm trying to return a string. I need the name of the country I'm clicking on to be passed into the GP tool params.

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 21:18:18 GMT

Lloyd,

OK, but the

window.map.infoWindow.getSelectedFeature();

returns a Graphic then you get the attribute you want from that Graphic using Graphic.attributes.NAME or Graphic.attributes["NAME"] to get the actual string values of the NAME attribute.

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Sun, 12 Dec 2021 05:02:41 GMT

I tried this and I'm getting the same error

var country = window.map.infoWindow.getSelectedFeature();
var countryName =  country.attributes["NAME"]; ‍‍‍‍

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 21:47:40 GMT

Lloyd,

What does

console.log(window.map.infoWindow.getSelectedFeature());

return?

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Sun, 12 Dec 2021 05:02:44 GMT

So I changed the code to use a query. This correctly displays the name of the country that I click on, in this case "Brazil." However, when I console.log(country) I get "3," and this is also what is passed in to the GP tool since I set country as a global variable.

var country = {};
          var content = "<b>Location</b>: ${NAME}";
        var infoTemplate = new InfoTemplate("Forecast Reports", content);
          
          var countriesLayer = new FeatureLayer("http://gis.mymetcon.com/arcgis/rest/services/Countries_Outline/MapServer/1",{
            mode: FeatureLayer.MODE_ONDEMAND,
            infoTemplate: infoTemplate,
            outFields: ["*"]
          });
            
          map.addLayer(countriesLayer);
          
          
              
          map.on("click", function(evt){
               var country = FeatureLayer.SELECTION_NEW;
               console.log(country);
                var selectQuery = new Query();          
           selectQuery.geometry = geometry;
            featureLayer.selectFeatures(selectQuery,
             country);
          map.infoWindow.setContent(content);
            
        }); ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 22:29:07 GMT

Lloyd,

???

var country = FeatureLayer.SELECTION_NEW;

That is because the constant for FeatureLayer.SELECTION_NEW is 3.

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Mon, 06 Mar 2017 22:34:26 GMT

I just found that out in another thread. How do I pass the result of that selection out as a string?

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 22:58:25 GMT

Lloyd,

The result of a FeatureLayer.selectFeatures returns an array of graphics (not a string). So you would have to have the callback set to a function and the response of that function would be that graphic array so you would have to get the first graphic in that array and the use its attributes property of that graphic to get the NAME attribute.

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Mon, 06 Mar 2017 22:59:45 GMT

OK. Could you point to an example of this? Thanks!

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Mon, 06 Mar 2017 23:06:04 GMT

Lloyd,

Sure:

Select with Feature Layer | ArcGIS API for JavaScript 3.20

Re: Use Feature Layer Attribute as GP Service Input

LloydBronn — Sun, 12 Dec 2021 05:02:47 GMT

Robert, which part is the relevant code in that example? Sorry, I've never worked with a callback function. Would it go inside this?

map.on("click", function(evt){
               
                var selectQuery = new Query();     
                selectQuery.returnGeometry = true; 
           selectQuery.geometry = geometry;
            featureLayer.selectFeatures(selectQuery,
             FeatureLayer.SELECTION_NEW);
               map.infoWindow.setContent(content)
            
        }); ‍‍‍‍‍‍‍‍‍‍

Re: Use Feature Layer Attribute as GP Service Input

RobertScheitlin__GISP — Sun, 12 Dec 2021 05:02:50 GMT

Lloyd,

The relevant part of that sample is the callback function for the FeatureLayer.selectFeatures:

featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function(results){
  //now you work with the results object which is an array of graphics
});‍‍‍‍‍‍‍‍‍