How to Hook GetNodeDefaults and GetConnectorDefaults in React Diagram?

This article explains how to Hook GetNodeDefaults and GetConnectorDefaults in React Diagram.

GetNodeDefaults

getNodeDefaults is a method we often use in our React Diagram component to customize common properties of diagram nodes. It can return or allow you to set properties such as:

Node appearance: Size, shape, color, border, etc.
Node data structure: Initial attributes like width, height and etc.

GetConnectorDefaults

Similar to getNodeDefaults, getConnectorDefaults is also a method used to customize common properties of connectors in the diagram component. It allows you to set properties such as:

Connector appearance: Style, shape, line width, type etc.

Refer to the code sample to hook getNodeDefaults and getConnectorDefaults in org-chart layout:

// Initialize the diagram component

<DiagramComponent
           id="diagram"
           ref={(diagram) => (diagramInstance = diagram)}
           width={'100%'}
           height={'700px'}
           // Configures data source settings
           dataSourceSettings={{
             id: 'Id',
             parentId: 'Manager',
             dataSource: new DataManager(localBindData),
           }}
           // Disables all interactions except zoom/pan
           tool={DiagramTools.ZoomPan}
           // Configures automatic layout
           layout={{
             type: 'OrganizationalChart',
             getLayoutInfo: (node, options) => {
               /* tslint:disable:no-string-literal */
               if (node.data['Role'] === 'General Manager') {
                 options.assistants.push(options.children[0]);
                 options.children.splice(0, 1);
               }
               if (!options.hasSubTree) {
                 options.type = 'Right';
               }
             },
           }}
           // Defines the default node and connector properties
           getNodeDefaults={(obj, diagram) => {
             return nodeDefaults(obj, diagram);
           }}
           getConnectorDefaults={(connector, diagram) => {
             return connectorDefaults(connector, diagram);
           }}
         >
           <Inject
             services={[DataBinding, HierarchicalTree, LayoutAnimation]}
           />
         </DiagramComponent>

// Sets default value for Node.
 function nodeDefaults(obj, diagram) {
   obj.backgroundColor = obj.data.color;
   obj.style = { fill: 'none', strokeColor: 'none', color: 'white' };
   obj.width = 120;
   obj.height = 30;
   return obj;
 }
 // Sets default value for Connector.
 function connectorDefaults(connector, diagram) {
   connector.targetDecorator.shape = 'None';
   connector.type = 'Orthogonal';
   connector.constraints = ConnectorConstraints.None;
   connector.cornerRadius = 0;
   return connector;
 } 

Below, we have provided an example sample for the nodeDefaults and connectorDefaults functions to customize the common properties of nodes and connectors of an organizational chart.

Organization chart :Sample

Conclusion

We hope you enjoyed about how to get child nodes from deleted nodes in React Diagram layout.

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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