letmap:google.maps.Map;letfeatureLayer;letinfoWindow;letlastInteractedFeatureIds=[];letlastClickedFeatureIds=[];functionhandleClick(/* MouseEvent */e){lastClickedFeatureIds=e.features.map(f=>f.placeId);lastInteractedFeatureIds=[];featureLayer.style=applyStyle;createInfoWindow(e);}functionhandleMouseMove(/* MouseEvent */e){lastInteractedFeatureIds=e.features.map(f=>f.placeId);featureLayer.style=applyStyle;}asyncfunctioninitMap(){// Request needed libraries.const{Map,InfoWindow}=awaitgoogle.maps.importLibrary('maps')asgoogle.maps.MapsLibrary;map=newMap(document.getElementById('map')asHTMLElement,{center:{lat:39.23,lng:-105.73},zoom:8,// In the cloud console, configure your Map ID with a style that enables the// 'Administrative Area Level 2' Data Driven Styling type.mapId:'a3efe1c035bad51b',// Substitute your own map ID.mapTypeControl:false,});// Add the feature layer.//@ts-ignorefeatureLayer=map.getFeatureLayer('ADMINISTRATIVE_AREA_LEVEL_2');// Add the event listeners for the feature layer.featureLayer.addListener('click',handleClick);featureLayer.addListener('mousemove',handleMouseMove);// Map event listener.map.addListener('mousemove',()=>{// If the map gets a mousemove, that means there are no feature layers// with listeners registered under the mouse, so we clear the last// interacted feature ids.if(lastInteractedFeatureIds?.length){lastInteractedFeatureIds=[];featureLayer.style=applyStyle;}});// Create the infowindow.infoWindow=newInfoWindow({});// Apply style on load, to enable clicking.featureLayer.style=applyStyle;}// Helper function for the infowindow.asyncfunctioncreateInfoWindow(event){letfeature=event.features[0];if(!feature.placeId)return;// Update the infowindow.constplace=awaitfeature.fetchPlace();letcontent='<span>Display name: '+place.displayName+'<br/> Place ID: '+feature.placeId+'<br/> Feature type: '+feature.featureType+'</span>';updateInfoWindow(content,event.latLng);}// Define styles.// Stroke and fill with minimum opacity value.conststyleDefault={strokeColor:'#810FCB',strokeOpacity:1.0,strokeWeight:2.0,fillColor:'white',fillOpacity:0.1,// Polygons must be visible to receive events.};// Style for the clicked polygon.conststyleClicked={...styleDefault,fillColor:'#810FCB',fillOpacity:0.5,};// Style for polygon on mouse move.conststyleMouseMove={...styleDefault,strokeWeight:4.0,};// Apply styles using a feature style function.functionapplyStyle(/* FeatureStyleFunctionOptions */params){constplaceId=params.feature.placeId;//@ts-ignoreif(lastClickedFeatureIds.includes(placeId)){returnstyleClicked;}//@ts-ignoreif(lastInteractedFeatureIds.includes(placeId)){returnstyleMouseMove;}returnstyleDefault;}// Helper function to create an info window.functionupdateInfoWindow(content,center){infoWindow.setContent(content);infoWindow.setPosition(center);infoWindow.open({map,shouldFocus:false,});}initMap();
index.ts

letmap;letfeatureLayer;letinfoWindow;letlastInteractedFeatureIds=[];letlastClickedFeatureIds=[];functionhandleClick(/* MouseEvent */e){lastClickedFeatureIds=e.features.map((f)=>f.placeId);lastInteractedFeatureIds=[];featureLayer.style=applyStyle;createInfoWindow(e);}functionhandleMouseMove(/* MouseEvent */e){lastInteractedFeatureIds=e.features.map((f)=>f.placeId);featureLayer.style=applyStyle;}asyncfunctioninitMap(){// Request needed libraries.const{Map,InfoWindow}=awaitgoogle.maps.importLibrary("maps");map=newMap(document.getElementById("map"),{center:{lat:39.23,lng:-105.73},zoom:8,// In the cloud console, configure your Map ID with a style that enables the// 'Administrative Area Level 2' Data Driven Styling type.mapId:"a3efe1c035bad51b",// Substitute your own map ID.mapTypeControl:false,});// Add the feature layer.//@ts-ignorefeatureLayer=map.getFeatureLayer("ADMINISTRATIVE_AREA_LEVEL_2");// Add the event listeners for the feature layer.featureLayer.addListener("click",handleClick);featureLayer.addListener("mousemove",handleMouseMove);// Map event listener.map.addListener("mousemove",()=>{// If the map gets a mousemove, that means there are no feature layers// with listeners registered under the mouse, so we clear the last// interacted feature ids.if(lastInteractedFeatureIds?.length){lastInteractedFeatureIds=[];featureLayer.style=applyStyle;}});// Create the infowindow.infoWindow=newInfoWindow({});// Apply style on load, to enable clicking.featureLayer.style=applyStyle;}// Helper function for the infowindow.asyncfunctioncreateInfoWindow(event){letfeature=event.features[0];if(!feature.placeId)return;// Update the infowindow.constplace=awaitfeature.fetchPlace();letcontent='<span>Display name: '+place.displayName+"<br/> Place ID: "+feature.placeId+"<br/> Feature type: "+feature.featureType+"</span>";updateInfoWindow(content,event.latLng);}// Define styles.// Stroke and fill with minimum opacity value.conststyleDefault={strokeColor:"#810FCB",strokeOpacity:1.0,strokeWeight:2.0,fillColor:"white",fillOpacity:0.1,// Polygons must be visible to receive events.};// Style for the clicked polygon.conststyleClicked={...styleDefault,fillColor:"#810FCB",fillOpacity:0.5,};// Style for polygon on mouse move.conststyleMouseMove={...styleDefault,strokeWeight:4.0,};// Apply styles using a feature style function.functionapplyStyle(/* FeatureStyleFunctionOptions */params){constplaceId=params.feature.placeId;//@ts-ignoreif(lastClickedFeatureIds.includes(placeId)){returnstyleClicked;}//@ts-ignoreif(lastInteractedFeatureIds.includes(placeId)){returnstyleMouseMove;}returnstyleDefault;}// Helper function to create an info window.functionupdateInfoWindow(content,center){infoWindow.setContent(content);infoWindow.setPosition(center);infoWindow.open({map,shouldFocus:false,});}initMap();
index.js

<html>  <head>    <title>Handle Region Boundary Click Event</title>    <link rel="stylesheet" type="text/css" href="./style.css" />    <script type="module" src="./index.js"></script>  </head>  <body>    <div></div>    <!-- prettier-ignore -->    <script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})        ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>  </body></html>
index.html