Leaflet Maps with Svelte Actions
Initialize and control a Leaflet map instance through a Svelte action.
Leaflet Maps with Svelte Actions is a free Sveltejs Academy lesson on CoddyKit — lesson 3 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Why Leaflet
Leaflet is a small, mature open-source mapping library that works well with Svelte.
Install
Add Leaflet and its CSS.
npm install leaflet
@import "leaflet/dist/leaflet.css";Action Pattern
Wrap Leaflet initialization in a Svelte action.
export function leafletMap(node, options) {
const map = L.map(node).setView(options.center, options.zoom);
L.tileLayer("https://...{z}/{x}/{y}.png").addTo(map);
return { destroy() { map.remove(); } };
}Use in Component
Apply the action to a div.
<div use:leafletMap={{ center: [40, 30], zoom: 12 }} style="height: 400px;" />Updating
Return an update function to react to parameter changes.
update(newOptions) { map.setView(newOptions.center, newOptions.zoom); }Markers
Add markers programmatically or in a Svelte child component sharing context.
Cleanup
Always call map.remove() in destroy to free resources.
SSR Caveat
Leaflet uses window/document. Guard with onMount or set ssr = false.
Tile Providers
Choose providers like OpenStreetMap, Mapbox, or Stadia for tiles.
Performance
For many markers, use clustering plugins.
Component Wrapper
Wrap the action in a component for reusable, parameterized maps.
Quick Check
Why use an action for Leaflet?
Recap
Wrap Leaflet in a Svelte action: init on mount, react via update, clean up in destroy. Avoid SSR for window access.
Frequently asked questions
Is the “Leaflet Maps with Svelte Actions” lesson free?
Yes — the full text of “Leaflet Maps with Svelte Actions” is free to read here on the web, and the Sveltejs Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO.
What will I learn in “Leaflet Maps with Svelte Actions”?
Initialize and control a Leaflet map instance through a Svelte action. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 3 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Leaflet Maps with Svelte Actions” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Using Tailwind CSS with SvelteKit
- D3.js Charts in Svelte
- Leaflet Maps with Svelte Actions
- Rich Text Editors: Tiptap