How to prevent deletion of node or connector in React Diagram using delete constraints?

This article explains how to prevent the deletion of a node or connector in React Diagram using delete constraints. In the Syncfusion® React Diagram, by using the NodeConstraints and ConnectorConstraints, we can enable/disable certain features of nodes/connectors.

To prevent the deletion of a node or connector in a diagram using delete constraints, set the constraints as follows for nodes and connectors.

//set constraints as delete for Node
constraints: NodeConstraints.Default & ~NodeConstraints.Delete

var nodes =
[
   {
       id: "heptagon",
       offsetX: 100,
       offsetY: 160,
       width: 80,
       height: 80,
       constraints: NodeConstraints.Default & ~NodeConstraints.Delete
   },
];

//set constraints as delete for connector
constraints: ConnectorConstraints.Default & ~ConnectorConstraints.Delete
var connectors =
[
   {
       id: "select",
       type: 'Orthogonal',
       constraints: ConnectorConstraints.Default & ~ConnectorConstraints.Delete
       sourcePoint: {
           x: 200,
           y: 150
       },
       targetPoint: {
           x: 320,
           y: 250
       }
   },
];

Refer to the working sample for additional details and implementation: Sample

Conclusion

We hope you enjoyed learning about how to prevent deletion of node or connector in React Diagram using delete constraints.

You can refer to our React Diagram feature tour page to learn about its other groundbreaking feature representations and documentation. You can also explore our React Diagram example to understand how to present and manipulate data.

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