how-to-add-and-customize-annotations-in-nodes-and-connectors-in-react-diagram

This repository is a small React sample that demonstrates how to add, customize, and programmatically manage annotations on nodes and connectors using the Syncfusion React Diagram component (@syncfusion/ej2-react-diagrams). The sample focuses on label/annotation usage: setting annotation content, styling, alignment and displacement, and adding annotations at runtime.

Prerequisites

• Node.js (v14 or later recommended) and npm installed on your machine.
• A modern browser to open the app (Chrome/Edge/Firefox).

Install and run locally

1. Install dependencies:

npm install

2. Start the development server:

npm start

This runs the app using react-scripts and opens http://localhost:3000 by default. The Diagram with nodes and annotated connectors should be visible. Click the "Add Annotations" button to see how annotations can be added/updated at runtime.

Build for production

To create a production build run:

npm run build

This will output optimized static files to the build/ directory using Create React App's build pipeline.

Dependencies

• @syncfusion/ej2-react-diagrams — the diagramming component used to render nodes, connectors and annotations.
• react, react-dom, react-scripts, typescript — typical Create React App stack.

Resources

• Syncfusion React Diagram documentation: https://ej2.syncfusion.com/react/documentation/diagram/labels
• Demo reference: https://ej2.syncfusion.com/react/demos/#/fluent2/diagram/getting-started-annotation