How to Prevent Node Moving Outside the Lane in JavaScript Diagram?

In the Syncfusion® JavaScript Diagram you can manage the movement of nodes using Node Constraints, particularly to prevent nodes from moving outside designated lanes.

To restrict a node’s movement to only within its assigned lane, you can use the AllowMovingOutsideLane option in the node constraints. When this option is enabled, it ensures that the node can only be moved within the confines of the lane, preventing any unwanted positioning outside of it.

// Set constraints as AllowMovingOutsideLane for node 
constraints: ej.diagrams.NodeConstraints.Default | ej.diagrams.NodeConstraints.AllowMovingOutsideLane 

Set the constraints as follows for the child node:

children: [
   {
       id: 'node1',
       annotations: [{ content: 'Node 1' }],
       margin: { left: 60, top: 30 },
       height: 40, width: 100, ports: port,
       constraints: ej.diagrams.NodeConstraints.Default | ej.diagrams.NodeConstraints.AllowMovingOutsideLane
   },
], 

You can find a working example of this implementation in the provided sample on StackBlitz.
Click here for the Sample

Conclusion
I hope you enjoyed learning how to prevent nodes from moving outside the lane in the JavaScript Diagram.

You can refer to our JavaScript 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 JavaScript Diagram example to understand how to create and manipulate data.
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