googlemaps-samples · willum070 · Feb 13, 2026 · Feb 17, 2026
diff --git a/samples/polyline-complex/README.md b/samples/polyline-complex/README.md
@@ -0,0 +1,41 @@
+# Google Maps JavaScript Sample
+
+## polyline-complex
+
+THhis example demonstrates constructing a polyline based on clicks (click the map to add a vertex).
+
+## Setup
+
+### Before starting run:
+
+`npm i`
+
+### Run an example on a local web server
+
+`cd samples/polyline-complex`
+`npm start`
+
+### Build an individual example
+
+`cd samples/polyline-complex`
+`npm run build`
+
+From 'samples':
+
+`npm run build --workspace=polyline-complex/`
+
+### Build all of the examples.
+
+From 'samples':
+
+`npm run build-all`
+
+### Run lint to check for problems
+
+`cd samples/polyline-complex`
+`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/polyline-complex/index.html b/samples/polyline-complex/index.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<!--
+ @license
+ Copyright 2026 Google LLC. All Rights Reserved.
+ SPDX-License-Identifier: Apache-2.0
+-->
+<!-- [START maps_polyline_complex] -->
+<html>
+  <head>
+    <title>Complex Polylines</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="41.879, -87.624"
+      zoom="7"
+      map-id="DEMO_MAP_ID"
+    ></gmp-map>
+  </body>
+</html>
+<!-- [END maps_polyline_complex] -->
diff --git a/samples/polyline-complex/index.ts b/samples/polyline-complex/index.ts
@@ -0,0 +1,53 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// [START maps_polyline_complex]
+/**
+ * This example creates an interactive map which constructs a polyline based on
+ * user clicks. Note that the polyline only appears once its path property
+ * contains two LatLng coordinates.
+ */
+
+let poly: google.maps.Polyline;
+const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
+let innerMap;
+
+async function initMap() {
+  // Import the needed libraries.
+  (await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;
+  (await google.maps.importLibrary('marker')) as google.maps.MarkerLibrary;
+
+  innerMap = mapElement.innerMap;
+
+  poly = new google.maps.Polyline({
+    strokeColor: "#000000",
+    strokeOpacity: 1.0,
+    strokeWeight: 3,
+  });
+  poly.setMap(innerMap);
+
+  // Add a listener for the click event
+  innerMap.addListener("click", addLatLng);
+}
+
+// Handles click events on a map, and adds a new point to the Polyline.
+function addLatLng(event: google.maps.MapMouseEvent) {
+  const path = poly.getPath();
+
+  // Because path is an MVCArray, we can simply append a new coordinate
+  // and it will automatically appear.
+  path.push(event.latLng as google.maps.LatLng);
+
+  // Add a new marker at the new plotted point on the polyline.
+  new google.maps.marker.AdvancedMarkerElement({
+    position: event.latLng,
+    title: "#" + path.getLength(),
+    map: innerMap,
+  });
+}
+
+initMap();
+// [END maps_polyline_complex]
diff --git a/samples/polyline-complex/package.json b/samples/polyline-complex/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "@js-api-samples/polyline-complex",
+  "version": "1.0.0",
+  "scripts": {
+    "build": "tsc && bash ../jsfiddle.sh polyline-complex && bash ../app.sh polyline-complex && bash ../docs.sh polyline-complex && npm run build:vite --workspace=. && bash ../dist.sh polyline-complex",
+    "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/polyline-complex/style.css b/samples/polyline-complex/style.css
@@ -0,0 +1,18 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/* [START maps_polyline_complex] */
+
+/* 
+ * Optional: Makes the sample page fill the window. 
+ */
+html,
+body {
+  height: 100%;
+  margin: 0;
+  padding: 0;
+}
+
+/* [END maps_polyline_complex] */
diff --git a/samples/polyline-complex/tsconfig.json b/samples/polyline-complex/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"
+  }
+}