How to Prevent Multiple Connectors From a Port in React Diagram?

This article explains how to prevent multiple connectors from a port in React Diagram. To prevent a connector from being drawn from a port that already has a connector connected to it in React Diagram, you can use the elementDraw event. This event is triggered when a connector is being drawn from a port.

By examining the arguments of the event, we can check for existing connections and cancel the drawing if the port is already connected.

Below is an example of how to implement this functionality:

elementDraw = {function (args) {
               if (args.state == 'Start') {
                 let ports = args.source.ports;
                 if (ports && diagramInstance.nodes !== undefined) {
                   for (let j = 0; j < ports.length; j++) {
                     let port = ports[j];
                     if (port && (port.outEdges.length > 0 || port.inEdges.length > 0)) {
                       args.cancel = true;
                     }
                   }
                 }
               }
}} 

Refer to the working sample for additional details and implementation: Click Here

Conclusion

We hope you enjoyed learning how to prevent multiple connectors from a port in React Diagram.

You can refer to our React Diagram feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started with configuration specifications. You can also explore our React Diagram example to understand how to create and manipulate data.

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