googlemaps-samples · willum070 · Feb 17, 2026
diff --git a/samples/control-custom-state/README.md b/samples/control-custom-state/README.md
@@ -0,0 +1,41 @@
+# Google Maps JavaScript Sample
+
+## control-custom-state
+
+This example demonstrates adding controls that store state. 
+
+## Setup
+
+### Before starting run:
+
+`npm i`
+
+### Run an example on a local web server
+
+`cd samples/control-custom-state`
+`npm start`
+
+### Build an individual example
+
+`cd samples/control-custom-state`
+`npm run build`
+
+From 'samples':
+
+`npm run build --workspace=control-custom-state/`
+
+### Build all of the examples.
+
+From 'samples':
+
+`npm run build-all`
+
+### Run lint to check for problems
+
+`cd samples/control-custom-state`
+`npx eslint index.ts` 
+
+## Feedback
+
+For feedback related to this sample, please open a new issue on
+[GitHub](https://github.com/googlemaps-samples/js-api-samples/issues).
diff --git a/samples/control-custom-state/index.html b/samples/control-custom-state/index.html
@@ -0,0 +1,39 @@
+<!doctype html>
+<!--
+ @license
+ Copyright 2026 Google LLC. All Rights Reserved.
+ SPDX-License-Identifier: Apache-2.0
+-->
+<!-- [START maps_control_custom_state] -->
+<html>
+    <head>
+        <title>Adding State to Controls</title>
+
+        <link rel="stylesheet" type="text/css" href="./style.css" />
+        <script type="module" src="./index.js"></script>
+        <!-- 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: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly"});</script>
+    </head>
+    <body>
+        <gmp-map center="41.85, -87.65" zoom="12">
+            <div
+                class="custom-control"
+                slot="control-block-start-inline-center">
+                <input
+                    type="button"
+                    class="button"
+                    id="btnCenterMap"
+                    value="Center Map"
+                    title="Click to recenter the map." />
+                <input
+                    type="button"
+                    class="button"
+                    id="btnSetCenter"
+                    value="Set Center"
+                    title="Click to change the center of the map." />
+            </div>
+        </gmp-map>
+    </body>
+</html>
+<!-- [END maps_control_custom_state] -->
diff --git a/samples/control-custom-state/index.ts b/samples/control-custom-state/index.ts
@@ -0,0 +1,43 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// [START maps_control_custom_state]
+let innerMap;
+const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
+
+let center: google.maps.LatLngLiteral = { lat: 41.85, lng: -87.65 };
+
+async function initMap() {
+    (await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;
+
+    innerMap = mapElement.innerMap;
+
+    // Get the button UI elements.
+    const setCenterButton = document.getElementById('btnCenterMap') as HTMLInputElement;
+    const resetCenterButton = document.getElementById('btnSetCenter') as HTMLInputElement;
+
+    // [START maps_control_custom_state_event_listeners]
+    // Set up the click event listener for the 'Center Map' button. Set the map
+    // to the currently stored center.
+    setCenterButton.addEventListener('click', () => {
+        const currentCenter = center;
+        innerMap.setCenter(currentCenter);
+    });
+
+    // Set up the click event listener for 'Set Center': Set the center of
+    // the control to the current center of the map.
+    resetCenterButton.addEventListener('click', () => {
+        const newCenter = innerMap.getCenter();
+
+        if (newCenter) {
+            center = newCenter;
+        }
+    });
+    // [END maps_control_custom_state_event_listeners]
+}
+
+initMap();
+// [END maps_control_custom_state]
diff --git a/samples/control-custom-state/package.json b/samples/control-custom-state/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "@js-api-samples/control-custom-state",
+  "version": "1.0.0",
+  "scripts": {
+    "build": "tsc && bash ../jsfiddle.sh control-custom-state && bash ../app.sh control-custom-state && bash ../docs.sh control-custom-state && npm run build:vite --workspace=. && bash ../dist.sh control-custom-state",
+    "test": "tsc && npm run build:vite --workspace=.",
+    "start": "tsc && vite build --base './' && vite",
+    "build:vite": "vite build --base './'",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+
+  }
+}
diff --git a/samples/control-custom-state/style.css b/samples/control-custom-state/style.css
@@ -0,0 +1,39 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/* [START maps_control_custom_state] */
+
+/* 
+ * Optional: Makes the sample page fill the window. 
+ */
+html,
+body {
+  height: 100%;
+  margin: 0;
+  padding: 0;
+}
+
+#btnCenterMap,
+#btnSetCenter {
+  background-color: #fff;
+  border: 2px solid #fff;
+  border-radius: 3px;
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
+  cursor: pointer;
+  float: left;
+  margin-bottom: 22px;
+  margin-top: 5px;
+  text-align: center;
+  color: rgb(25, 25, 25);
+  font-family: Roboto, Arial, sans-serif;
+  font-size: 15px;
+  line-height: 25px;
+}
+
+#btnSetCenter {
+  margin-left: 12px;
+}
+
+/* [END maps_control_custom_state] */
diff --git a/samples/control-custom-state/tsconfig.json b/samples/control-custom-state/tsconfig.json
@@ -0,0 +1,17 @@
+{
+  "compilerOptions": {
+    "module": "esnext",
+    "target": "esnext",
+    "strict": true,
+    "noImplicitAny": false,
+    "lib": [
+      "es2015",
+      "esnext",
+      "es6",
+      "dom",
+      "dom.iterable"
+    ],
+    "moduleResolution": "Node",
+    "jsx": "preserve"
+  }
+}