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Find nearest features using Arcade expressions in a popup
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Description
This sample demonstrates how to access other features from a layer using the FeatureSet capabilities available in Arcade expressions. When the user clicks a hotel feature in this sample, the Arcade expression executes and finds all restaurants within 500 meters of the hotel. The hotel's distance to each restaurant is then measured. Information for the closest restaurant is then displayed in the hotel's popup.Code
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Popup - Arcade FeatureSet</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.29/esri/css/esri.css">
<style>
html, body, #map {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script>
var dojoConfig = {
has: {
"esri-featurelayer-webgl": 1
}
};
</script>
<script src="https://js.arcgis.com/3.29/"></script>
<script type="text/plain" id="nearest-restaurant-arcade">
var searchDistance = 1;
var restaurants = FeatureSetById($map, /* Restaurants_London */ "Restaurants_London_4772");
// returns all restaurants within 500m of the hotel
var closestRestaurants = Intersects( restaurants, BufferGeodetic( $feature, searchDistance, "kilometers") );
var minDistance = Infinity;
var closestRestaurant;
// Of the restaurants within 500m of the hotel,
// the closest one is returned along with the distance
for (var listing in closestRestaurants){
var restaurantDistance = Distance(listing, $feature, "meters");
if(restaurantDistance < minDistance){
minDistance = restaurantDistance;
closestRestaurant = listing;
}
};
"Hotel: " + $feature.name + "\n" +
"Closest Restaurant: " + closestRestaurant.name + "\n" +
IIF(!IsEmpty(closestRestaurant.opening_hours), "Hours: " + closestRestaurant.opening_hours, "");
</script>
<script>
require([
"esri/dijit/PopupTemplate",
"esri/arcadeProfiles/popupProfile",
"esri/arcgis/utils",
"dojo/domReady!"
],
function(
PopupTemplate,
popupProfile,
arcgisUtils
) {
var map;
var nearestRestaurantArcade = document.getElementById("nearest-restaurant-arcade").text;
// load a webmap containing layers for restaurants and hotels
arcgisUtils.createMap("33618a191bee4ebc806922fccc536769", "map").then(function (response) {
map = response.map;
// initialize the popup profile for the arcade expressions intended for use in the popup.
// This ensures that Arcade expressions properly load and execute geometry and feature set
// functions asynchronously
return popupProfile.initialize( [ nearestRestaurantArcade ] );
}).then(function(){
var hotels = map.getLayer(map.graphicsLayerIds[0]);
// Reference the Arcade expression in the PopupTemplate's content.
// This expression will display the name of the restaurant closest to
// the selected hotel. If available, the opening hours of the
// closest restaurant are also displayed
hotels.setInfoTemplate(new PopupTemplate({
title: "Closest Restaurant",
description: "{expression/nearest-restaurant}",
expressionInfos: [{
name: "nearest-restaurant",
title: "Nearest Restaurant",
expression: nearestRestaurantArcade
}]
}));
});
});
</script>
</head>
<body>
<div id="map"></div>
</body>
</html>