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README.md

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GitHub License MIT npm downloads

Svelte Flow is a highly customizable component for building interactive graphs and node-based editors, built by the creators of React Flow.

☣️ Svelte Flow is still alpha and currently under heavy development. The API is relatively stable but some things might change. ☣️

🚀 Getting Started | 📖 Documentation | 📺 Examples | ☎️ Discord

Key Features

  • Easy to use: Seamless zooming and panning, single- and multi selection of graph elements and keyboard shortcuts are supported out of the box
  • Customizable: Different node and edge types and support for custom nodes with multiple handles and custom edges
  • Fast rendering: Only nodes that have changed are re-rendered
  • Hooks and Utils: Hooks for handling nodes, edges and the viewport and graph helper functions
  • Plugin Components: Background, MiniMap and Controls
  • Reliable: Written in Typescript and tested with Playwright

Installation

The easiest way to get the latest version of Svelte Flow is to install it via npm, yarn or pnpm:

npm install @xyflow/svelte

Getting started

You only need a few lines to get a fully interactive (e.g. select and drag nodes or pan and zoom) flow. If you want to learn more, please refer to the learn section, the examples or the API reference.

<script lang="ts">
  import { writable } from 'svelte/store';
  import {
    SvelteFlow,
    Controls,
    Background,
    BackgroundVariant,
    MiniMap,
  } from '@xyflow/svelte';

  // you need to import the styles for Svelte Flow to work
  // if you just want to load the basic styleds, you can import '@xyflow/svelte/dist/base.css'
  import '@xyflow/svelte/dist/style.css'
  
  // We are using writables for the nodes and edges to sync them easily. When a user drags a node for example, Svelte Flow updates its position. This also makes it easier to update nodes in user land.
  const nodes = writable([
    {
      id: '1',
      type: 'input',
      data: { label: 'Input Node' },
      position: { x: 0, y: 0 }
    },
    {
      id: '2',
      type: 'custom',
      data: { label: 'Node' },
      position: { x: 0, y: 150 }
    }
  ]);

  // same for edges
  const edges = writable([
    {
      id: '1-2',
      type: 'default',
      source: '1',
      target: '2',
      label: 'Edge Text'
    }
  ]);
</script>

<SvelteFlow
  {nodes}
  {edges}
  fitView
  on:nodeclick={(event) => console.log('on node click', event)}
>
  <Controls />
  <Background variant={BackgroundVariant.Dots} />
  <MiniMap />
</SvelteFlow>

How to Contribute

Show us what you make: Drop it in into our Discord Server, tweet at us, or email us at [email protected]

Community Participation: Ask and answer questions in our Discord Server or jump in on Github discussions.

Squash Bugs: We can’t catch them all. Check existing issues and discussions first, then create a new issue to tell us what’s up.

Financial Support: If you are an organization who wants to make sure Svelte Flow continues to be maintained, reach out to us at [email protected]

And of course, we love Github stars ⭐

Development

If you want to check out the current version you need to run the following command from the root directory:

  1. pnpm install - install dependencies
  2. pnpm build - needs to be done once
  3. pnpm dev - starts dev server

You can now access the examples under http://127.0.0.1:5173

Maintainers

Svelte Flow is maintained by the team behind xyflow. If you need help or want to talk to us about a collaboration, reach out through our contact form or by joining our Discord Server.

License

Svelte Flow is MIT licensed.