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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<title>Point clustering - generate suggested configuration | Sample | GeoScene API for JavaScript 4.22</title>
<link rel="stylesheet" href="https://js.geoscene.cn/4.23/geoscene/themes/light/main.css" />
<script src="https://js.geoscene.cn/4.23/"></script>
<style>
html, body, #viewDiv {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
}
#infoDiv {
background: white;
padding: 10px;
}
</style>
<script>
require([
"geoscene/WebMap",
"geoscene/views/MapView",
"geoscene/layers/FeatureLayer",
"geoscene/widgets/Legend",
"geoscene/widgets/Expand",
"geoscene/smartMapping/labels/clusters",
"geoscene/smartMapping/popup/clusters"
], (Map, MapView, FeatureLayer, Legend, Expand,
clusterLabelCreator, clusterPopupCreator
) => {
const serviceUrl =
"https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Places_of_Worship_India/FeatureServer/0";
const layer = new FeatureLayer({
url: serviceUrl,
title: "Places of worship",
outFields: [ "name", "religion", "denomination" ],
popupTemplate: {
title: "{name}",
content: [
{
type: "fields",
fieldInfos: [
{
fieldName: "religion"
},
{
fieldName: "denomination"
}
]
}
]
}
});
const map = new Map({
basemap: "gray-vector",
layers: [ layer ]
});
const view = new MapView({
container: "viewDiv",
map,
center: [ 80.20127, 22.12355 ],
zoom: 4
});
// Override the default symbol representing the cluster extent
view.popup.viewModel.selectedClusterBoundaryFeature.symbol = {
type: "simple-fill",
style: "solid",
color: "rgba(50,50,50,0.15)",
outline: {
width: 0.5,
color: "rgba(50,50,50,0.25)"
}
}
const legend = new Legend({
view,
container: "legendDiv"
});
const infoDiv = document.getElementById("infoDiv");
view.ui.add(
new Expand({
view,
content: infoDiv,
expandIconClass: "esri-icon-layer-list",
expanded: true
}), "top-right");
layer.when()
.then(generateClusterConfig)
.then((featureReduction) => {
layer.featureReduction = featureReduction;
const toggleButton = document.getElementById("toggle-cluster");
toggleButton.addEventListener("click", toggleClustering);
// To turn off clustering on a layer, set the
// featureReduction property to null
function toggleClustering() {
if(isWithinScaleThreshold()){
let fr = layer.featureReduction;
layer.featureReduction =
fr && fr.type === "cluster" ? null : featureReduction;
}
toggleButton.innerText =
toggleButton.innerText === "Enable Clustering"
? "Disable Clustering"
: "Enable Clustering";
}
view.whenLayerView(layer).then((layerView) => {
const filterSelect = document.getElementById("filter");
// filters the layer using a definitionExpression
// based on a religion selected by the user
filterSelect.addEventListener("change", (event) => {
const newValue = event.target.value;
const whereClause = newValue
? `religion = '${newValue}'`
: null;
layerView.filter = {
where: whereClause
};
// close popup for former cluster that no longer displays
view.popup.close();
});
});
view.watch("scale", (scale) => {
if(toggleButton.innerText === "Disable Clustering"){
layer.featureReduction = isWithinScaleThreshold() ? featureReduction : null;
}
})
}).catch((error) => {
console.error(error);
});
function isWithinScaleThreshold(){
return view.scale > 50000;
}
async function generateClusterConfig(layer){
// generates default popupTemplate
const popupTemplate = await clusterPopupCreator
.getTemplates({ layer })
.then(popupTemplateResponse => popupTemplateResponse.primaryTemplate.value);
// generates default labelingInfo
const { labelingInfo, clusterMinSize } = await clusterLabelCreator
.getLabelSchemes({ layer, view })
.then(labelSchemes => labelSchemes.primaryScheme );
return {
type: "cluster",
popupTemplate,
labelingInfo,
clusterMinSize
};
}
});
</script>
</head>
<body>
<div id="viewDiv"></div>
<div id="infoDiv" class="geoscene-widget">
Filter by religion:
<select id="filter" class="esri-select">
<option value="">All</option>
<option value="Hindu">Hindu</option>
<option value="Christian">Christian</option>
<option value="Muslim">Muslim</option>
<option value="Buddhist">Buddhist</option>
<option value="Sikh">Sikh</option>
<option value="Jain">Jain</option>
</select>
<div style="padding-top: 10px;">
<button id="toggle-cluster" class="geoscene-button">Disable Clustering</button>
</div>
<div id="legendDiv"></div>
</div>
</body>
</html>
