topic Re: Closest Facility with Feature Layer from ArcGIS Online in ArcGIS JavaScript Maps SDK Questions

Closest Facility with Feature Layer from ArcGIS Online

JohnPaulAlbana — Fri, 07 May 2021 15:49:36 GMT

I am trying to use a feature layer from ArcGIS Online to be an input facility in my closest facility parameter. I just recently started using ArcGIS JavaScript API and I saw someone's example in this forum which looks similar to this:

facilitiesFeatureLayer = new FeatureLayer(

"https://services6.arcgis.com/dUO3N3UOHvGU89bM/arcgis/rest/services/Murals_20201103/FeatureServer/0", {

mode:FeatureLayer.MODE_SNAPSHOT

});

let featuresetFacilities = new FeatureSet({

});

featuresetFacilities.features = facilitiesFeatureLayer.graphics;

function findClosestFacility(startFeature, facilityFeatures) {

const closestFacilityTask = new ClosestFacilityTask({

url: "https://route-api.arcgis.com/arcgis/rest/services/World/ClosestFacility/NAServer/ClosestFacility_World/solveClosestFacility/",

});

const params = new ClosestFacilityParameters({

incidents: new FeatureSet({

features: [startFeature],

}),

returnRoutes: true,

returnFacilities: true,

defaultTargetFacilityCount: 3,

});

params.facilities = featuresetFacilities;

The code runs but returns no results:

Re: Closest Facility with Feature Layer from ArcGIS Online

Noah-Sager — Fri, 07 May 2021 17:28:14 GMT

Hi @JohnPaulAlbana, can you post a link to an app that reproduces this issue? On something like Codepen would be great. You can omit the apiKey if you are using one. Then I can investigate further.

Re: Closest Facility with Feature Layer from ArcGIS Online

JohnPaulAlbana — Fri, 07 May 2021 17:58:52 GMT

Hi @Noah-Sager , thanks for coming by, here is the codepen link:

https://codepen.io/bonjwa-the-styleful/pen/qBrEoog

Re: Closest Facility with Feature Layer from ArcGIS Online

Noah-Sager — Fri, 07 May 2021 18:47:28 GMT

The first error you see when loading the app is: Uncaught (in promise) ReferenceError: facilities is not defined

So we need to get the locations of the features into a facilities variable. There is some good doc to go through here: https://developers.arcgis.com/documentation/mapping-apis-and-services/routing/closest-facility-routing/

I can take a closer look next week as well.

Re: Closest Facility with Feature Layer from ArcGIS Online

JohnGrayson — Fri, 07 May 2021 23:04:45 GMT

In your codepen you are mixing 3.x and 4.x code; that won't work. Here's a slightly modified version of your code that gets and sets the facilities before you start trying to call the solver:

https://codepen.io/john-grayson/pen/oNZgPYX