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Adding State to Controls

  • This example demonstrates how to add controls to a Google Map that can store and utilize state.

  • It features two buttons: "Set Center" which stores the current map center, and "Center Map" which recenters the map to the stored location.

  • The sample code showcases the implementation using TypeScript and JavaScript, along with HTML and CSS for styling.

  • Users can interact with a live demo through provided links to JSFiddle and Google Cloud Shell.

  • Developers can clone and run the sample locally using Git and Node.js following the instructions provided.

This example demonstrates adding controls that store state. It shows a map withtwo buttons, "Set Center" and "Center Map". The "Set Center" button can be usedto store the center of the map. Pressing the "Center Map" button will pan themap to the previously stored center.

Read thedocumentation.

TypeScript

letmap:google.maps.Map;constchicago:google.maps.LatLngLiteral={lat:41.85,lng:-87.65};/** * The CenterControl adds a control to the map that recenters the map on * Chicago. */classCenterControl{privatemap_:google.maps.Map;privatecenter_:google.maps.LatLng;constructor(controlDiv:HTMLElement,map:google.maps.Map,center:google.maps.LatLngLiteral){this.map_=map;// Set the center property upon constructionthis.center_=newgoogle.maps.LatLng(center);controlDiv.style.clear="both";// Set CSS for the control borderconstgoCenterUI=document.createElement("button");goCenterUI.id="goCenterUI";goCenterUI.title="Click to recenter the map";controlDiv.appendChild(goCenterUI);// Set CSS for the control interiorconstgoCenterText=document.createElement("div");goCenterText.id="goCenterText";goCenterText.innerHTML="Center Map";goCenterUI.appendChild(goCenterText);// Set CSS for the setCenter control borderconstsetCenterUI=document.createElement("button");setCenterUI.id="setCenterUI";setCenterUI.title="Click to change the center of the map";controlDiv.appendChild(setCenterUI);// Set CSS for the control interiorconstsetCenterText=document.createElement("div");setCenterText.id="setCenterText";setCenterText.innerHTML="Set Center";setCenterUI.appendChild(setCenterText);// Set up the click event listener for 'Center Map': Set the center of// the map// to the current center of the control.goCenterUI.addEventListener("click",()=>{constcurrentCenter=this.center_;this.map_.setCenter(currentCenter);});// Set up the click event listener for 'Set Center': Set the center of// the control to the current center of the map.setCenterUI.addEventListener("click",()=>{constnewCenter=this.map_.getCenter()!;if(newCenter){this.center_=newCenter;}});}}functioninitMap():void{map=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{zoom:12,center:chicago,});// Create the DIV to hold the control and call the CenterControl()// constructor passing in this DIV.constcenterControlDiv=document.createElement("div");constcontrol=newCenterControl(centerControlDiv,map,chicago);// @ts-ignorecenterControlDiv.index=1;centerControlDiv.style.paddingTop="10px";map.controls[google.maps.ControlPosition.TOP_CENTER].push(centerControlDiv);}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
Note: Read theguide on using TypeScript and Google Maps.

JavaScript

letmap;constchicago={lat:41.85,lng:-87.65};/** * The CenterControl adds a control to the map that recenters the map on * Chicago. */classCenterControl{map_;center_;constructor(controlDiv,map,center){this.map_=map;// Set the center property upon constructionthis.center_=newgoogle.maps.LatLng(center);controlDiv.style.clear="both";// Set CSS for the control borderconstgoCenterUI=document.createElement("button");goCenterUI.id="goCenterUI";goCenterUI.title="Click to recenter the map";controlDiv.appendChild(goCenterUI);// Set CSS for the control interiorconstgoCenterText=document.createElement("div");goCenterText.id="goCenterText";goCenterText.innerHTML="Center Map";goCenterUI.appendChild(goCenterText);// Set CSS for the setCenter control borderconstsetCenterUI=document.createElement("button");setCenterUI.id="setCenterUI";setCenterUI.title="Click to change the center of the map";controlDiv.appendChild(setCenterUI);// Set CSS for the control interiorconstsetCenterText=document.createElement("div");setCenterText.id="setCenterText";setCenterText.innerHTML="Set Center";setCenterUI.appendChild(setCenterText);// Set up the click event listener for 'Center Map': Set the center of// the map// to the current center of the control.goCenterUI.addEventListener("click",()=>{constcurrentCenter=this.center_;this.map_.setCenter(currentCenter);});// Set up the click event listener for 'Set Center': Set the center of// the control to the current center of the map.setCenterUI.addEventListener("click",()=>{constnewCenter=this.map_.getCenter();if(newCenter){this.center_=newCenter;}});}}functioninitMap(){map=newgoogle.maps.Map(document.getElementById("map"),{zoom:12,center:chicago,});// Create the DIV to hold the control and call the CenterControl()// constructor passing in this DIV.constcenterControlDiv=document.createElement("div");constcontrol=newCenterControl(centerControlDiv,map,chicago);// @ts-ignorecenterControlDiv.index=1;centerControlDiv.style.paddingTop="10px";map.controls[google.maps.ControlPosition.TOP_CENTER].push(centerControlDiv);}window.initMap=initMap;
Note: The JavaScript is compiled from the TypeScript snippet.

CSS

/* * Always set the map height explicitly to define the size of the div element * that contains the map. */#map{height:100%;}/* * Optional: Makes the sample page fill the window. */html,body{height:100%;margin:0;padding:0;}#goCenterUI,#setCenterUI{background-color:#fff;border:2pxsolid#fff;border-radius:3px;box-shadow:02px6pxrgba(0,0,0,0.3);cursor:pointer;float:left;margin-bottom:22px;text-align:center;}#goCenterText,#setCenterText{color:rgb(25,25,25);font-family:Roboto,Arial,sans-serif;font-size:15px;line-height:25px;padding-left:5px;padding-right:5px;}#setCenterUI{margin-left:12px;}

HTML

<html>  <head>    <title>Adding State to Controls</title>    <link rel="stylesheet" type="text/css" href="./style.css" />    <script type="module" src="./index.js"></script>  </head>  <body>    <div></div>    <!--       The `defer` attribute causes the script to execute after the full HTML      document has been parsed. For non-blocking uses, avoiding race conditions,      and consistent behavior across browsers, consider loading using Promises. See      https://developers.google.com/maps/documentation/javascript/load-maps-js-api      for more information.      -->    <script      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"      defer    ></script>  </body></html>

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow theseinstructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

gitclone-bsample-control-custom-statehttps://github.com/googlemaps/js-samples.gitcdjs-samplesnpminpmstart

Other samples can be tried by switching to any branch beginning withsample-SAMPLE_NAME.

gitcheckoutsample-SAMPLE_NAMEnpminpmstart

Except as otherwise noted, the content of this page is licensed under theCreative Commons Attribution 4.0 License, and code samples are licensed under theApache 2.0 License. For details, see theGoogle Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-11-21 UTC.