BPMN-js is a powerful JavaScript library for rendering and interacting with BPMN 2.0 diagrams in the browser. It allows developers to embed BPMN diagrams into web applications, providing tools for viewing, modeling, and editing business process models.

Pros

• Easy integration into web applications
• Extensive API for customization and extension
• Supports both viewing and editing of BPMN diagrams
• Active development and community support

Cons

• Learning curve for complex customizations
• Limited support for non-standard BPMN elements
• Performance can be affected with very large diagrams
• Requires additional modules for certain features (e.g., minimap)

Code Examples

1. Creating a BPMN viewer:

import BpmnViewer from 'bpmn-js';

const viewer = new BpmnViewer({
  container: '#canvas'
});

viewer.importXML(bpmnXML)
  .then(({ warnings }) => {
    console.log('BPMN diagram rendered');
  })
  .catch(err => {
    console.error('Error rendering diagram', err);
  });

2. Adding a custom module:

import BpmnModeler from 'bpmn-js/lib/Modeler';

const customModule = {
  __init__: ['customService'],
  customService: ['type', CustomService]
};

const modeler = new BpmnModeler({
  container: '#canvas',
  additionalModules: [customModule]
});

3. Listening to events:

modeler.on('element.click', event => {
  const { element } = event;
  console.log('Clicked element', element.id);
});

Getting Started

To get started with BPMN-js, follow these steps:

1. Install the library:

   npm install bpmn-js
   

2. Import and use in your project:

   import BpmnViewer from 'bpmn-js';
   
   const viewer = new BpmnViewer({
     container: '#canvas'
   });
   
   fetch('/path/to/diagram.bpmn')
     .then(response => response.text())
     .then(bpmnXML => {
       viewer.importXML(bpmnXML);
     });
   

3. Include the BPMN-js CSS file in your HTML:

   <link rel="stylesheet" href="node_modules/bpmn-js/dist/assets/bpmn-js.css">
   

For more advanced usage and customization options, refer to the official documentation.