Comparing layers
This example allows comparison of two layers with resizable map panes using the Split.js library.
TypeScript
function initMap(): void { const mapOptions = { center: { lat: 44.5250489, lng: -110.83819 }, zoom: 18, scaleControl: false, streetViewControl: false, }; // instantiate the map on the left with control positioning mapLeft = new google.maps.Map( document.getElementById("map-left") as HTMLElement, { ...mapOptions, mapTypeId: "satellite", tilt: 0, // at high zoom levels we need to maintain the same projection fullscreenControlOptions: { position: google.maps.ControlPosition.LEFT_BOTTOM, }, mapTypeControlOptions: { position: google.maps.ControlPosition.LEFT_TOP, }, zoomControlOptions: { position: google.maps.ControlPosition.LEFT_BOTTOM, }, } ); // instantiate the map on the right with control positioning mapRight = new google.maps.Map( document.getElementById("map-right") as HTMLElement, { ...mapOptions, fullscreenControlOptions: { position: google.maps.ControlPosition.RIGHT_BOTTOM, }, mapTypeControlOptions: { position: google.maps.ControlPosition.RIGHT_TOP, }, zoomControlOptions: { position: google.maps.ControlPosition.RIGHT_BOTTOM, }, } ); // helper function to keep maps in sync function sync(...maps: google.maps.Map[]) { let center: google.maps.LatLng, zoom: number; function update(changedMap) { maps.forEach((m) => { if (m === changedMap) { return; } m.setCenter(center); m.setZoom(zoom); }); } maps.forEach((m) => { m.addListener("bounds_changed", () => { const changedCenter = m.getCenter()!; const changedZoom = m.getZoom()!; if (changedCenter !== center || changedZoom !== zoom) { center = changedCenter; zoom = changedZoom; update(m); } }); }); } sync(mapLeft, mapRight); function handleContainerResize() { const width = (document.getElementById("container") as HTMLElement) .offsetWidth; (document.getElementById( "map-left" ) as HTMLElement).style.width = `${width}px`; (document.getElementById( "map-right" ) as HTMLElement).style.width = `${width}px`; } // trigger to set map container size since using absolute handleContainerResize(); // add event listener window.addEventListener("resize", handleContainerResize); //@ts-ignore Split(["#left", "#right"], { sizes: [50, 50], }); }
JavaScript
let mapLeft, mapRight; function initMap() { const mapOptions = { center: { lat: 44.5250489, lng: -110.83819 }, zoom: 18, scaleControl: false, streetViewControl: false, }; // instantiate the map on the left with control positioning mapLeft = new google.maps.Map(document.getElementById("map-left"), { ...mapOptions, mapTypeId: "satellite", tilt: 0, fullscreenControlOptions: { position: google.maps.ControlPosition.LEFT_BOTTOM, }, mapTypeControlOptions: { position: google.maps.ControlPosition.LEFT_TOP, }, zoomControlOptions: { position: google.maps.ControlPosition.LEFT_BOTTOM, }, }); // instantiate the map on the right with control positioning mapRight = new google.maps.Map(document.getElementById("map-right"), { ...mapOptions, fullscreenControlOptions: { position: google.maps.ControlPosition.RIGHT_BOTTOM, }, mapTypeControlOptions: { position: google.maps.ControlPosition.RIGHT_TOP, }, zoomControlOptions: { position: google.maps.ControlPosition.RIGHT_BOTTOM, }, }); // helper function to keep maps in sync function sync(...maps) { let center, zoom; function update(changedMap) { maps.forEach((m) => { if (m === changedMap) { return; } m.setCenter(center); m.setZoom(zoom); }); } maps.forEach((m) => { m.addListener("bounds_changed", () => { const changedCenter = m.getCenter(); const changedZoom = m.getZoom(); if (changedCenter !== center || changedZoom !== zoom) { center = changedCenter; zoom = changedZoom; update(m); } }); }); } sync(mapLeft, mapRight); function handleContainerResize() { const width = document.getElementById("container").offsetWidth; document.getElementById("map-left").style.width = `${width}px`; document.getElementById("map-right").style.width = `${width}px`; } // trigger to set map container size since using absolute handleContainerResize(); // add event listener window.addEventListener("resize", handleContainerResize); //@ts-ignore Split(["#left", "#right"], { sizes: [50, 50], }); }
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; } #container, #left, #right, .map, .gutter { height: 100%; } #left, #right, .gutter { float: left; position: relative; overflow: hidden; } #map-left { position: absolute; left: 0; top: 0; } #map-right { position: absolute; right: 0; top: 0; } .gutter { background-color: #eee; background-repeat: no-repeat; background-position: 50%; } .gutter.gutter-horizontal { cursor: col-resize; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg=="); }
HTML
<!DOCTYPE html> <html> <head> <title>Split Map Panes</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/split.js/1.5.11/split.min.js"></script> <link rel="stylesheet" type="text/css" href="./style.css" /> <script src="./index.js"></script> </head> <body> <div id="container"> <div id="left"> <div id="map-left" class="map"></div> </div> <div id="right"> <div id="map-right" class="map"></div> </div> </div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly" async ></script> </body> </html>
All
<!DOCTYPE html> <html> <head> <title>Split Map Panes</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/split.js/1.5.11/split.min.js"></script> <style type="text/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; } #container, #left, #right, .map, .gutter { height: 100%; } #left, #right, .gutter { float: left; position: relative; overflow: hidden; } #map-left { position: absolute; left: 0; top: 0; } #map-right { position: absolute; right: 0; top: 0; } .gutter { background-color: #eee; background-repeat: no-repeat; background-position: 50%; } .gutter.gutter-horizontal { cursor: col-resize; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg=="); } </style> <script> let mapLeft, mapRight; function initMap() { const mapOptions = { center: { lat: 44.5250489, lng: -110.83819 }, zoom: 18, scaleControl: false, streetViewControl: false, }; // instantiate the map on the left with control positioning mapLeft = new google.maps.Map(document.getElementById("map-left"), { ...mapOptions, mapTypeId: "satellite", tilt: 0, fullscreenControlOptions: { position: google.maps.ControlPosition.LEFT_BOTTOM, }, mapTypeControlOptions: { position: google.maps.ControlPosition.LEFT_TOP, }, zoomControlOptions: { position: google.maps.ControlPosition.LEFT_BOTTOM, }, }); // instantiate the map on the right with control positioning mapRight = new google.maps.Map(document.getElementById("map-right"), { ...mapOptions, fullscreenControlOptions: { position: google.maps.ControlPosition.RIGHT_BOTTOM, }, mapTypeControlOptions: { position: google.maps.ControlPosition.RIGHT_TOP, }, zoomControlOptions: { position: google.maps.ControlPosition.RIGHT_BOTTOM, }, }); // helper function to keep maps in sync function sync(...maps) { let center, zoom; function update(changedMap) { maps.forEach((m) => { if (m === changedMap) { return; } m.setCenter(center); m.setZoom(zoom); }); } maps.forEach((m) => { m.addListener("bounds_changed", () => { const changedCenter = m.getCenter(); const changedZoom = m.getZoom(); if (changedCenter !== center || changedZoom !== zoom) { center = changedCenter; zoom = changedZoom; update(m); } }); }); } sync(mapLeft, mapRight); function handleContainerResize() { const width = document.getElementById("container").offsetWidth; document.getElementById("map-left").style.width = `${width}px`; document.getElementById("map-right").style.width = `${width}px`; } // trigger to set map container size since using absolute handleContainerResize(); // add event listener window.addEventListener("resize", handleContainerResize); //@ts-ignore Split(["#left", "#right"], { sizes: [50, 50], }); } </script> </head> <body> <div id="container"> <div id="left"> <div id="map-left" class="map"></div> </div> <div id="right"> <div id="map-right" class="map"></div> </div> </div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly" async ></script> </body> </html>
Create a starter application from sample
A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.
Run Locally
Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.
npx @googlemaps/js-samples init split-map-panes DESTINATION_FOLDER
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