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Automatic Layout

Diagram provides support to auto-arrange the nodes in the diagram area that is referred as Layout. It includes the following layout modes:

Layout modes

  • Hierarchical layout
  • Organization chart
  • Radial tree
  • Symmetric layout
  • Mind Map layout
  • Complex hierarchical tree layout

Hierarchical layout

The hierarchical tree layout arranges nodes in a tree-like structure, where the nodes in the hierarchical layout may have multiple parents. There is no need to specify the layout root. To arrange the nodes in a hierarchical structure, specify the layout type as hierarchical tree.

Note: If you want to use hierarchical tree layout in diagram, you need to inject HierarchicalTree in the diagram.

The following example shows how to arrange the nodes in a hierarchical structure.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    NodeModel,
    DiagramConstraints,
    HierarchicalTree,
    TextModel,
    DataBinding
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Name: "Steve-Ceo"
    },
    {
        Name: "Kevin-Manager",
        ReportingPerson: "Steve-Ceo"
    },
    {
        Name: "Peter-Manager",
        ReportingPerson: "Steve-Ceo"
    },
    {
        Name: "John- Manager",
        ReportingPerson: "Peter-Manager"
    },
    {
        Name: "Mary-CSE ",
        ReportingPerson: "Peter-Manager"
    },
    {
        Name: "Jim-CSE ",
        ReportingPerson: "Kevin-Manager"
    },
    {
        Name: "Martin-CSE",
        ReportingPerson: "Kevin-Manager"
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'HierarchicalTree'
            }
        }
        //Configures data source for diagram
        dataSourceSettings = {
            {
                id: 'Name',
                parentId: 'ReportingPerson',
                dataManager: items
            }
        }
        //Sets the default properties for nodes
        getNodeDefaults = {
            (obj: Node) => {
                obj.shape = {
                    type: 'Text',
                    content: (obj.data as {
                        Name: 'string'
                    }).Name
                };
                obj.style = {
                    fill: 'None',
                    strokeColor: 'none',
                    strokeWidth: 2,
                    bold: true,
                    color: 'white'
                };
                obj.borderColor = 'white';
                obj.width = 100;
                obj.height = 40;
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                (obj.shape as TextModel).margin = {
                    left: 5,
                    right: 5,
                    top: 5,
                    bottom: 5
                };
                return obj;
            }
        }
        //Sets the default properties for and connectors
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Radial tree layout

The radial tree layout arranges nodes on a virtual concentric circle around a root node. Sub-trees formed by the branching of child nodes are located radially around the child nodes. This arrangement result in an ever-expanding concentric arrangement with radial proximity to the root node indicating the node level in the hierarchy. The layout root property can be used to define the root node of the layout. When no root node is set, the algorithm automatically considers one of the diagram nodes as the root node.

To arrange nodes in a radial tree structure, set the type of the layout as radialtree. The following code illustrates how to arrange the nodes in a radial tree structure.

Note: If you want to use radial tree layout in diagram, you need to inject DataBinding and RadialTree in the diagram.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    Node,
    Container,
    TextElement,
    StackPanel,
    ImageElement,
    DataBinding,
    RadialTree,
    TreeInfo,
    DiagramTools
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object = [{
        "Id": 1,
        "Name": "Ana Trujillo",
        "Designation": "Project Manager",
        "RatingColor": "#68C2DE"
    },
    {
        "Id": 2,
        "Name": "Lino Rodri",
        "Designation": "Project Manager",
        "RatingColor": "#68C2DE",
        "ReportingPerson": 1
    },
    {
        "Id": 3,
        "Name": "Philip Cramer",
        "Designation": "Project Manager",
        "RatingColor": "#68C2DE",
        "ReportingPerson": 1
    },
    {
        "Id": 4,
        "Name": "Pedro Afonso",
        "Designation": "Project Manager",
        "RatingColor": "#68C2DE",
        "ReportingPerson": 1
    },
    {
        "Id": 5,
        "Name": "Anto Moreno",
        "Designation": "Project Lead",
        "RatingColor": "#93B85A",
        "ReportingPerson": 1
    },
    {
        "Id": 6,
        "Name": "Elizabeth Roel",
        "Designation": "Project Lead",
        "RatingColor": "#93B85A",
        "ReportingPerson": 1
    },
    {
        "Id": 7,
        "Name": "Aria Cruz",
        "Designation": "Project Lead",
        "RatingColor": "#93B85A",
        "ReportingPerson": 1
    },
    {
        "Id": 8,
        "Name": "Eduardo Roel",
        "Designation": "Project Lead",
        "RatingColor": "#93B85A",
        "ReportingPerson": 1
    },
    {
        "Id": 9,
        "Name": "Howard Snyd",
        "Designation": "Project Lead",
        "RatingColor": "#68C2DE",
        "ReportingPerson": 1
    },
    {
        "Id": 10,
        "Name": "Daniel Tonini",
        "Designation": "Project Lead",
        "RatingColor": "#93B85A",
        "ReportingPerson": 1
    },
    {
        "Id": 11,
        "Name": "Nardo Batista",
        "Designation": "Project Lead",
        "RatingColor": "#68C2DE",
        "ReportingPerson": 1
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(5));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '590px'
        }
        snapSettings = {
            {
                constraints: 0
            }
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //set the type as Radial tree
                type: 'RadialTree',
                root: 'parent'
            }
        }
        //Configures data source for diagram
        dataSourceSettings = {
            {
                id: 'Id',
                parentId: 'ReportingPerson',
                dataManager: items
            }
        }
        //Sets the default properties for nodes and connectors
        getNodeDefaults = {
            (obj: Node, diagram: Diagram) => {
                obj.height = 15;
                obj.width = 15;
                obj.borderWidth = 1;
                obj.style = {
                    fill: '#6BA5D7',
                    strokeWidth: 2,
                    strokeColor: '#6BA5D7'
                };
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.targetDecorator.shape = 'None';
                connector.type = 'Straight';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, RadialTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Organizational Chart

An organizational chart is a diagram that displays the structure of an organization and relationships. To create an organizational chart, the type of layout should be set as an organizationalchart. The following code example illustrates how to create an organizational chart.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    Node,
    Container,
    TextElement,
    StackPanel,
    ImageElement,
    DataBinding,
    HierarchicalTree,
    TreeInfo,
    DiagramTools
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Id: "parent",
        Role: "Project Management"
    },
    {
        Id: 1,
        Role: "R&D Team",
        Team: "parent"
    },
    {
        Id: 3,
        Role: "Philosophy",
        Team: "1"
    },
    {
        Id: 4,
        Role: "Organization",
        Team: "1"
    },
    {
        Id: 5,
        Role: "Technology",
        Team: "1"
    },
    {
        Id: 7,
        Role: "Funding",
        Team: "1"
    },
    {
        Id: 8,
        Role: "Resource Allocation",
        Team: "1"
    },
    {
        Id: 9,
        Role: "Targeting",
        Team: "1"
    },
    {
        Id: 11,
        Role: "Evaluation",
        Team: "1"
    },
    {
        Id: 156,
        Role: "HR Team",
        Team: "parent"
    },
    {
        Id: 13,
        Role: "Recruitment",
        Team: "156"
    },
    {
        Id: 113,
        Role: "Training",
        Team: "12"
    },
    {
        Id: 112,
        Role: "Employee Relation",
        Team: "156"
    },
    {
        Id: 14,
        Role: "Record Keeping",
        Team: "12"
    },
    {
        Id: 15,
        Role: "Compensations & Benefits",
        Team: "12"
    },
    {
        Id: 16,
        Role: "Compliances",
        Team: "12"
    },
    {
        Id: 17,
        Role: "Production & Sales Team",
        Team: "parent"
    },
    {
        Id: 119,
        Role: "Design",
        Team: "17"
    },
    {
        Id: 19,
        Role: "Operation",
        Team: "17"
    },
    {
        Id: 20,
        Role: "Support",
        Team: "17"
    },
    {
        Id: 21,
        Role: "Quality Assurance",
        Team: "17"
    },
    {
        Id: 23,
        Role: "Customer Interaction",
        Team: "17"
    },
    {
        Id: 24,
        Role: "Support and Maintenance",
        Team: "17"
    },
    {
        Id: 25,
        Role: "Task Coordination",
        Team: "17"
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(5));
ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //set the type as Organizational Chart
                type: 'OrganizationalChart'
            }
        }
        //Configures data source for diagram
        dataSourceSettings = {
            {
                id: 'Id',
                parentId: 'Team',
                dataManager: items
            }
        }
        //Sets the default properties for nodes and connectors
        getNodeDefaults = {
            (obj: NodeModel) => {
                obj.shape = {
                    type: 'Text',
                    content: (obj.data as {
                        Role: 'string'
                    }).Role
                };
                obj.style = {
                    fill: 'None',
                    strokeColor: 'none',
                    strokeWidth: 2,
                    bold: true,
                    color: 'white'
                };
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                obj.width = 75;
                obj.height = 40;
                (obj.shape as TextModel).margin = {
                    left: 5,
                    right: 5,
                    top: 5,
                    bottom: 5
                };
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Organizational chart layout starts parsing from root and iterate through all its child elements. The getLayoutInfo method provides necessary information of a node’s children and the way to arrange (direction, orientation, offsets, etc.) them. The arrangements can be customized by overriding this function as explained.

GetLayoutInfo Set chart orientations, chart types, and offset to be left between parent and child nodes by overriding the method, diagram.layout.getLayoutInfo. The getLayoutInfo method is called to configure every subtree of the organizational chart. It takes the following arguments.

* node: Parent node to that options are to be customized.
* options: Object to set the customizable properties.
Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    Node,
    DataBinding,
    HierarchicalTree,
    SnapConstraints,
    TreeInfo
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Id: 1,
        Role: "General Manager"
    },
    {
        Id: 2,
        Role: "Assistant Manager",
        Team: 1
    },
    {
        Id: 3,
        Role: "Human Resource Manager",
        Team: 1
    },
    {
        Id: 4,
        Role: "Design Manager",
        Team: 1
    },
    {
        Id: 5,
        Role: "Operation Manager",
        Team: 1
    },
    {
        Id: 6,
        Role: "Marketing Manager",
        Team: 1
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '530px'
        }
        snapSettings = {
            {
                constraints: SnapConstraints.None
                }
            }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'OrganizationalChart',
                getLayoutInfo: (node: Node, options: TreeInfo) => {
                    if (!options.hasSubTree) {
                        options.type = 'Center';
                        options.orientation = 'Horizontal';
                    }
                }
            }
        }
        //Configures data source for diagram
        dataSourceSettings = {
            {
                id: 'Id',
                parentId: 'Team',
                dataManager: items
            }
        }
        //Sets the default properties for nodes and connectors
        getNodeDefaults = {
            (obj: Node, diagram: diagram) => {
                obj.width = 150;
                obj.height = 50;
                obj.style.fill = '#6BA5D7';
                obj.annotations = [{
                    content: obj.data['Role'],
                    style: {
                        color: 'white'
                    }
                }];
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.targetDecorator.shape = 'None';
                connector.targetDecorator.shape = 'None';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

The following table illustrates the properties that “options” argument takes.

Property Description Default Value
options.assistants By default, the collection is empty. When any of the child nodes have to be set as Assistant, you can remove from children collection and have to insert into assistants collection. Empty array
options.orientation Gets or sets the organizational chart orientation. SubTreeOrientation.Vertical
options.type Gets or sets the chart organizational chart type. For horizontal chart orientation:SubTreeAlignments.Center and for vertical chart orientation:SubTreeAlignments.Alternate
options.offset Offset is the horizontal space to be left between parent and child nodes. 20 pixels applicable only for vertical chart orientations.
options.hasSubTree Gets whether the node contains subtrees. Boolean
options.level Gets the depth of the node from layout root. Number
options.enableRouting By default, connections are routed based on the chart type and orientations. This property gets or sets whether default routing is to be enabled or disabled. true
options.rows Sets the number of rows on which the child nodes will be arranged. Applicable only for balanced type horizontal tree. Number

The following table illustrates the different chart orientations and chart types.

Orientation Type Description Example
Horizontal Left Arranges the child nodes horizontally at the left side of the parent. Horizontal Left
Right Arranges the child nodes horizontally at the right side of the parent. Horizontal Right
Center Arranges the children like standard tree layout orientation. Horizontal Center
Balanced Arranges the leaf level child nodes in multiple rows. Horizontal Balanced
Vertical Left Arranges the children vertically at the left side of the parent. Vertical Left
Right Arranges the children vertically at the right side of the parent. Vertical Right
Alternate Arranges the children vertically at both left and right sides of the parent. Vertical Alternate

The following code example illustrates how to set the vertical right arrangement to the leaf level trees.

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    Node,
    DataBinding,
    HierarchicalTree,
    TreeInfo
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Id: "parent",
        Role: "Board"
    },
    {
        Id: "1",
        Role: "General Manager",
        Manager: "parent"
    },
    {
        Id: "2",
        Role: "Human Resource Manager",
        Manager: "1"
    },
    {
        Id: "3",
        Role: "Trainers",
        Manager: "2"
    },
    {
        Id: "4",
        Role: "Recruiting Team",
        Manager: "2"
    },
    {
        Id: "6",
        Role: "Design Manager",
        Manager: "1"
    },
    {
        Id: "7",
        Role: "Design Supervisor",
        Manager: "6"
    },
    {
        Id: "8",
        Role: "Development Supervisor",
        Manager: "6"
    },
    {
        Id: "9",
        Role: "Drafting Supervisor",
        Manager: "6"
    },
    {
        Id: "10",
        Role: "Marketing Manager",
        Manager: "1"
    },
    {
        Id: "11",
        Role: "Oversea sales Manager",
        Manager: "10"
    },
    {
        Id: "12",
        Role: "Petroleum Manager",
        Manager: "10"
    },
    {
        Id: "13",
        Role: "Service Dept. Manager",
        Manager: "10"
    },
];

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        heigh = {
            '530px'
        }
        snapSettings = {
            {
                constraints: 0
            }
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'OrganizationalChart',
                getLayoutInfo: (node: Node, options: TreeInfo) => {
                    if (node.data['Role'] === 'General Manager') {
                        options.assistants.push(options.children[0]);
                        options.children.splice(0, 1);
                    }
                    if (!options.hasSubTree) {
                        options.type = 'Right';
                        options.orientation = 'Vertical';
                    }
                }
            }
        }
        //Configures data source for diagram
        dataSourceSettings = {
            {
                id: 'Id',
                parentId: 'Manager',
                dataManager: new DataManager(data as JSON[]),
            }
        }
        //Sets the default properties for nodes and connectors
        getNodeDefaults = {
            (obj: Node, diagram: Diagram) => {
                obj.width = 150;
                obj.height = 50;
                obj.borderColor = 'white';
                obj.style.fill = '#6BA5D7';
                obj.borderWidth = 1;
                obj.annotations = [{
                    content: obj.data['Role'],
                    style: {
                        color: 'white'
                    }
                }];
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill = '#6BA5D7';
                connector.targetDecorator.style.strokeColor = '#6BA5D7';
                connector.targetDecorator.shape = 'None';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Assistant

Assistants are child item that have a different relationship with the parent node. They are laid out in a dedicated part of the tree. A node can be specified as an assistant of its parent by adding it to the assistants property of the argument “options”.

The following code example illustrates how to add assistants to layout.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    Node,
    DataBinding,
    HierarchicalTree,
    TreeInfo,
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data
let data: object[] = [{
        Id: 1,
        Role: "General Manager"
    },
    {
        Id: 2,
        Role: "Assistant Manager",
        Team: 1
    },
    {
        Id: 3,
        Role: "Human Resource Manager",
        Team: 1
    },
    {
        Id: 4,
        Role: "Design Manager",
        Team: 1
    },
    {
        Id: 5,
        Role: "Operation Manager",
        Team: 1
    },
    {
        Id: 6,
        Role: "Marketing Manager",
        Team: 1
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '530px'
        }
        snapSettings = {
            {
                constraints: 0
            }
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'OrganizationalChart',
                // define the getLayoutInfo
                getLayoutInfo: (node: Node, options: TreeInfo) => {
                    if (node.data['Role'] === 'General Manager') {
                        options.assistants.push(options.children[0]);
                        options.children.splice(0, 1);
                    }
                    if (!options.hasSubTree) {
                        options.type = 'Center';
                        options.orientation = 'Horizontal';
                    }
                }
            }
        }
        //Initializes the node template.
        dataSourceSettings = {
            {
                id: 'Id',
                parentId: 'Team',
                dataManager: items
            }
        }
        //Sets the default properties for nodes and connectors
        getNodeDefaults = {
            (obj: Node, diagram: diagram) => {
                obj.width = 150;
                obj.height = 50;
                obj.borderColor = 'white';
                obj.style.fill = '#6BA5D7';
                obj.borderWidth = 1;
                obj.annotations = [{
                    content: obj.data['Role'],
                    style: {
                        color: 'white'
                    }
                }];
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.targetDecorator.shape = 'None';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Symmetric layout

The symmetric layout has been formed using nodes position by closer together or pushing them further apart. This is repeated iteratively until the system comes to an equilibrium state.

The layout’s springLength defined as how long edges should be, ideally. This will be the resting length for the springs. Edge attraction and vertex repulsion forces to be defined by using layout’s springFactor, the more sibling nodes repel each other. The relative positions do not change any more from one iteration to the next. The number of iterations can be specified by using layout’s maxIteration.

Note: If you want to use symmetric layout in diagram, you need to inject SymmetricLayout in the diagram.

The following code illustrates how to arrange the nodes in a radial tree structure.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    IConnector,
    DataBinding,
    HierarchicalTree,
    LayoutOrientation,
    LayoutType,
    Rect,
    HorizontalAlignment,
    VerticalAlignment,
    NodeModel,
    BasicShapeModel,
    SymmetricLayout
} from "@syncfusion/ej2-react-diagrams";

let nodes: NodeModel[] = [];
let connectors: ConnectorModel[] = [];
// creating the connection between the layout nodes and connectors.
export function ConnectNodes(parentNode: NodeModel, childNode: NodeModel): ConnectorModel {
    let connector: ConnectorModel = {
        id: parentNode.id + childNode.id,
        sourceID: parentNode.id,
        targetID: childNode.id,
        targetDecorator: {
            shape: 'None'
        }
    }
    return connector;
}
// creating the layout nodes as rectangle in shape.
export function GetRectangle(name: string): NodeModel {
    let shape: BasicShapeModel = {
        type: 'Basic',
        shape: 'Ellipse'
    };
    let node: NodeModel = {
        id: name,
        height: 25,
        width: 25,
        borderColor: 'white',
        borderWidth: 1,
        style: {
            fill: '#6BA5D7'
        },
        shape: shape
    };
    return node;
}
// creating the symmetrical layout child elements hierarchy.
export function populateNodes() {
    let parentRect: NodeModel = GetRectangle("p");
    nodes.push(parentRect);
    for (let i: number = 0; i < 2; i++) {
        let childRect_i: NodeModel = GetRectangle("c" + i);
        nodes.push(childRect_i);
        for (let j: number = 0; j < 2; j++) {
            let childRect_j: NodeModel = GetRectangle("c" + i + j);
            nodes.push(childRect_j);
            for (let k: number = 0; k < 6; k++) {
                let childRect_k: NodeModel = GetRectangle("c" + i + j + k);
                nodes.push(childRect_k);
                connectors.push(ConnectNodes(childRect_j, childRect_k));
            }
            connectors.push(ConnectNodes(childRect_i, childRect_j));
        }
        connectors.push(ConnectNodes(parentRect, childRect_i));
    }
    return nodes;
}
//sets the layout child elements
populateNodes();
ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        layout = {
            {
                //sets the layout as symmetric layout
                type: 'SymmetricalLayout',
                springLength: 80,
                springFactor: 0.8,
                maxIteration: 500,
                margin: {
                    left: 20,
                    top: 20
                }
            }
        }
        nodes = {
            nodes
        }
        connectors = {
            connectors
        }
        getNodeDefaults = {
            (obj: Node, diagram: Diagram) => {
                obj.borderColor = 'white';
                obj.borderWidth = 1;
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill = '#6BA5D7';
                connector.targetDecorator.style.strokeColor = '#6BA5D7';
                return connector;
            }
        }
        ><Inject services = {[SymmetricLayout]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Mind Map layout

A mind map is a diagram that displays the nodes as a spider diagram organizes information around a central concept. To create mind map, the type of layout should be set as MindMap.

Note: If you want to use mind map layout in diagram, you need to inject MindMap in the diagram.

The following code example illustrates how to create an organizational chart.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    Node,
    DataBinding,
    LayoutType,
    Rect,
    HorizontalAlignment,
    VerticalAlignment,
    NodeModel,
    TextModel,
    MindMap
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        id: 1,
        Label: 'StackPanel'
    },
    {
        id: 2,
        Label: 'Label',
        parentId: 1
    },
    {
        id: 3,
        Label: 'ListBox',
        parentId: 1
    },
    {
        id: 4,
        Label: 'StackPanel',
        parentId: 2
    },
    {
        id: 5,
        Label: 'Border',
        parentId: 2
    },
    {
        id: 6,
        Label: 'Border',
        parentId: 4
    },
    {
        id: 7,
        Label: 'Button',
        parentId: 4
    },
    {
        id: 8,
        Label: 'ContentPresenter',
        parentId: 5
    },
    {
        id: 9,
        Label: 'Text Block',
        parentId: 5
    },

];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));
// Initializes Diagram
ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'MindMap'
            }
        }
        //Configures data source for diagram
        dataSourceSettings = {
            {
                id: 'id',
                parentId: 'parentId',
                dataManager: items,
                root: String(1)
            }
        }
        //Sets the default properties for nodes and connectors
        getNodeDefaults = {
            (obj: Node) => {
                obj.shape = {
                    type: 'Text',
                    content: (obj.data as {
                        Label: 'string'
                    }).Label,
                };
                obj.style = {
                    fill: '#6BA5D7',
                    strokeColor: 'none',
                    strokeWidth: 2
                };
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                (obj.shape as TextModel).margin = {
                    left: 5,
                    right: 5,
                    top: 5,
                    bottom: 5
                };
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill = '#6BA5D7';
                connector.targetDecorator.style.strokeColor = '#6BA5D7';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, MindMap]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Complex hierarchical tree

Complex hierarchical tree layout is the extended version of the hierarchical tree layout. The child had been two or more parents. To create a complex hierarchical tree, the type of layout should be set as ComplexHierarchicalTree.

Note: If you want to use Complex hierarchical layout in diagram, you need to inject ComplexHierarchicalTree in the diagram.

The following code example illustrates how to create a complex hierarchical tree.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    NodeModel,
    DataBinding,
    DiagramConstraints,
    ComplexHierarchicalTree
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes nodes
let node: NodeModel[] = [{
    id: 'node1',
    width: 70,
    height: 70,
    annotations: [{
        content: 'node1'
    }]
}, {
    id: 'node2',
    width: 70,
    height: 70,
    annotations: [{
        content: 'node2'
    }]
}, {
    id: 'node3',
    width: 70,
    height: 70,
    annotations: [{
        content: 'node3'
    }]
}, {
    id: 'node4',
    width: 70,
    height: 70,
    annotations: [{
        content: 'node4'
    }]
}, {
    id: 'node5',
    width: 70,
    height: 70,
    annotations: [{
        content: 'node5'
    }]
}, {
    id: 'node8',
    width: 70,
    height: 70,
    annotations: [{
        content: 'node8'
    }]
}, {
    id: 'node9',
    width: 70,
    height: 70,
    annotations: [{
        content: 'node9'
    }]
}];

let connector: ConnectorModel[] = [{
    id: 'connectr',
    sourceID: 'node1',
    targetID: 'node4'
}, {
    id: 'connectr1',
    sourceID: 'node2',
    targetID: 'node4'
}, {
    id: 'connectr3',
    sourceID: 'node3',
    targetID: 'node4'
}, {
    id: 'connectr4',
    sourceID: 'node4',
    targetID: 'node5'
}];

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            1000
        }
        height = {
            1000
        }
        nodes = {
            node
        }
        connectors = {
            connector
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'ComplexHierarchicalTree',
                orientation: 'TopToBottom'
            }
        }
        //Sets the default properties for nodes and connectors
        getNodeDefaults = {
            (obj: Node) => {
                obj.shape = {
                    type: 'Text',
                    style: {
                        color: 'white'
                    }
                };
                obj.style = {
                    fill: '#6BA5D7',
                    strokeColor: 'none',
                    strokeWidth: 2
                };
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                (obj.shape as TextModel).margin = {
                    left: 5,
                    right: 5,
                    top: 5,
                    bottom: 5
                };
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill = '#6BA5D7';
                connector.targetDecorator.style.strokeColor = '#6BA5D7';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[ComplexHierarchicalTree, DataBinding]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Customize layout

Orientation, spacings, and position of the layout can be customized with a set of properties.

To explore layout properties, refer to Layout Properties.

Layout bounds Diagram provides support to align the layout within any custom rectangular area. For more information about bounds, refer to bounds.

Layout alignment The layout can be aligned anywhere over the layout bounds/viewport using the horizontalAlignment and verticalAlignment properties of the layout.

The following code illustrates how to align the layout at the top-left of the layout bounds.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    NodeModel,
    DiagramConstraints,
    HierarchicalTree,
    TextModel,
    DataBinding,
    Rect
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Name: "Steve-Ceo"
    },
    {
        Name: "Kevin-Manager",
        ReportingPerson: "Steve-Ceo"
    },
    {
        Name: "Peter-Manager",
        ReportingPerson: "Kevin-Manager"
    },
    {
        Name: "John- Manager",
        ReportingPerson: "Peter-Manager"
    },
    {
        Name: "Mary-CSE ",
        ReportingPerson: "Peter-Manager"
    },
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'HierarchicalTree',
                //set layout alignment
                bounds: new Rect(0, 0, 500, 500),
                horizontalSpacing: 25,
                verticalSpacing: 30,
                horizontalAlignment: 'Left',
                verticalAlignment: 'Top'
            }
        }
        dataSourceSettings = {
            {
                id: 'Name',
                parentId: 'ReportingPerson',
                dataManager: items
            }
        }
        getNodeDefaults = {
            (obj: Node) => {
                obj.shape = {
                    type: 'Text',
                    content: (obj.data as {
                        Name: 'string'
                    }).Name
                };
                obj.style = {
                    fill: 'None',
                    strokeColor: 'none',
                    strokeWidth: 2,
                    bold: true,
                    color: 'white'
                };
                obj.width = 100;
                obj.height = 40;
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Layout spacing Layout provides support to add space horizontally and vertically between the nodes. The horizontalSpacing and verticalSpacing properties of the layout allows you to set the space between the nodes in horizontally and vertically.

Layout margin Layout provides support to add some blank space between the layout bounds/viewport and the layout. The margin property of the layout allows you to set the blank space.

The following code illustrates how to set the layout margin.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    NodeModel,
    DiagramConstraints,
    HierarchicalTree,
    TextModel,
    DataBinding,
    Rect
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Name: "Steve-Ceo"
    },
    {
        Name: "Kevin-Manager",
        ReportingPerson: "Steve-Ceo"
    },
    {
        Name: "Peter-Manager",
        ReportingPerson: "Kevin-Manager"
    },
    {
        Name: "John- Manager",
        ReportingPerson: "Peter-Manager"
    },
    {
        Name: "Mary-CSE ",
        ReportingPerson: "Peter-Manager"
    },
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'HierarchicalTree',
                bounds: new Rect(0, 0, 500, 500),
                horizontalSpacing: 25,
                verticalSpacing: 30,
                horizontalAlignment: 'Left',
                verticalAlignment: 'Top'
            }
        }
        //Sets the default properties for nodes and connectors
        dataSourceSettings = {
            {
                id: 'Name',
                parentId: 'ReportingPerson',
                dataManager: items
            }
        }
        //Configures data source for diagram
        getNodeDefaults = {
            (obj: Node) => {
                obj.shape = {
                    type: 'Text',
                    content: (obj.data as {
                        Name: 'string'
                    }).Name
                };
                obj.style = {
                    fill: 'None',
                    strokeColor: 'none',
                    strokeWidth: 2,
                    bold: true,
                    color: 'white'
                };
                obj.width = 50;
                obj.height = 40;
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                (obj.shape as TextModel).margin = {
                    left: 25,
                    right: 25,
                    top: 25,
                    bottom: 25
                };
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill = '#6BA5D7';
                connector.targetDecorator.style.strokeColor = '#6BA5D7';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Layout orientation Diagram provides support to customize the orientation of layout. You can set the desired orientation using layout.orientation.

The following code illustrates how to arrange the nodes in a BottomToTop orientation.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    NodeModel,
    DiagramConstraints,
    HierarchicalTree,
    TextModel,
    DataBinding,
    Rect
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Name: "Steve-Ceo"
    },
    {
        Name: "Kevin-Manager",
        ReportingPerson: "Steve-Ceo"
    },
    {
        Name: "Peter-Manager",
        ReportingPerson: "Steve-Ceo"
    },
    {
        Name: "John- Manager",
        ReportingPerson: "Peter-Manager"
    },
    {
        Name: "Mary-CSE ",
        ReportingPerson: "Peter-Manager"
    },
    {
        Name: "Jim-CSE ",
        ReportingPerson: "Kevin-Manager"
    },
    {
        Name: "Martin-CSE",
        ReportingPerson: "Kevin-Manager"
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        //Uses layout to auto-arrange nodes on the diagram page
        layout = {
            {
                //Sets layout type
                type: 'HierarchicalTree',
                bounds: new Rect(0, 0, 500, 500),
                horizontalSpacing: 25,
                verticalSpacing: 30,
                horizontalAlignment: 'Left',
                verticalAlignment: 'Top',
                orientation: 'BottomToTop'
            }
        }
        dataSourceSettings = {
            {
                id: 'Name',
                parentId: 'ReportingPerson',
                dataManager: items
            }
        }
        //Sets the default properties for nodes and connectors
        getNodeDefaults = {
            (obj: Node) => {
                obj.shape = {
                    type: 'Text',
                    content: (obj.data as {
                        Name: 'string'
                    }).Name
                };
                obj.style = {
                    fill: 'None',
                    strokeColor: 'none',
                    strokeWidth: 2,
                    bold: true,
                    color: 'white'
                };
                obj.width = 50;
                obj.height = 40;
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                (obj.shape as TextModel).margin = {
                    left: 25,
                    right: 25,
                    top: 25,
                    bottom: 25
                };
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Fixed node Layout provides support to arrange the nodes with reference to the position of a fixed node and set it to the fixedNode of the layout property. This is helpful when you try to expand/collapse a node. It might be expected that the position of the double-clicked node should not be changed.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    NodeModel,
    DiagramConstraints,
    HierarchicalTree,
    TextModel,
    DataBinding,
    Rect
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Name: "Steve-Ceo",
        //set the offsetX and offsetY for the parent node
        offsetX: 250,
        offsetY: 50
    },
    {
        Name: "Kevin-Manager",
        ReportingPerson: "Steve-Ceo"
    },
    {
        Name: "Peter-Manager",
        ReportingPerson: "Steve-Ceo"
    },
    {
        Name: "John- Manager",
        ReportingPerson: "Peter-Manager"
    },
    {
        Name: "Mary-CSE ",
        ReportingPerson: "Peter-Manager"
    },
    {
        Name: "Jim-CSE ",
        ReportingPerson: "Kevin-Manager"
    },
    {
        Name: "Martin-CSE",
        ReportingPerson: "Kevin-Manager"
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        //Defines default layout
        layout = {
            {
                type: 'HierarchicalTree',
                bounds: new Rect(0, 0, 500, 500),
                horizontalSpacing: 25,
                verticalSpacing: 30,
                horizontalAlignment: 'Left',
                verticalAlignment: 'Top'
            }
        }
        dataSourceSettings = {
            {
                id: 'Name',
                parentId: 'ReportingPerson',
                dataManager: items
            }
        }
        //Sets the default properties of the node.
        getNodeDefaults = {
            (obj: Node) => {
                obj.shape = {
                    type: 'Text',
                    content: (obj.data as {
                        Name: 'string'
                    }).Name
                };
                obj.style = {
                    fill: 'None',
                    strokeColor: 'none',
                    strokeWidth: 2,
                    bold: true,
                    color: 'white'
                };
                obj.width = 50;
                obj.height = 40;
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                (obj.shape as TextModel).margin = {
                    left: 25,
                    right: 25,
                    top: 25,
                    bottom: 25
                };
                return obj;
            }
        }
        //Sets the default properties of the connector.
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );

Expand and collapse Diagram allows to expand/collapse the subtrees of a layout. The node’s isExpanded property allows you to expand/collapse its children. The following code example shows how to expand/collapse the children of a node.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    Node,
    Animation,
    Container,
    TextElement,
    StackPanel,
    SelectorConstraints,
    ImageElement,
    DataBinding,
    HierarchicalTree,
    LayoutAnimation
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
import {
    NodeModel,
    Orientation,
    VerticalAlignment,
    PathElement,
    HorizontalAlignment,
    DiagramNativeElement,
    IconShapeModel
} from "@syncfusion/ej2-react-diagrams";
//Initializes data source
let data: object[] = [{
        'Id': 'parent1',
        'Name': 'Maria ',
        'Designation': 'Managing Director',
        'RatingColor': '#C34444'
    },
    {
        'Id': 'parent',
        'Name': ' sam',
        'Designation': 'Managing Director',
        'ReportingPerson': 'parent1',
        'RatingColor': '#C34444'
    },
    {
        'Id': 'parent3',
        'Name': ' sam geo',
        'Designation': 'Managing Director',
        'ReportingPerson': 'parent1',
        'RatingColor': '#C34444'
    },
    {
        'Id': '80',
        'Name': ' david',
        'Designation': 'Managing Director',
        'ReportingPerson': 'parent3',
        'RatingColor': '#C34444'
    },
    {
        'Id': '82',
        'Name': ' pirlo',
        'Designation': 'Managing Director',
        'ReportingPerson': 'parent',
        'RatingColor': '#C34444'
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '1250px'
        }
        height = {
            '590px'
        }
        selectedItems = {
            {
                constraints: ~SelectorConstraints.ResizeAll
            }
        }
        snapSettings = {
            {
                constraints: 0
            }
        }
        layout = {
            {
            // set enableAnimation as true
            enableAnimation: true,
            type: 'HierarchicalTree',
            margin: {
                top: 20
            }, // define the getLayoutInfo
            getLayoutInfo: (node: Node, tree: TreeInfo) => {
                if (!tree.hasSubTree) {
                    tree.orientation = 'vertical';
                    tree.type = 'alternate';
                }
            }
            }
        }
        // define the dataSourceSettings
        dataSourceSettings = {
            {
                id: 'Id',
                parentId: 'ReportingPerson',
                dataManager: items
            }
        }
        // define the node defaults
        getNodeDefaults = {
            (obj: Node, diagram: Diagram) => {
                obj.expandIcon = {
                    height: 15,
                    width: 15,
                    shape: "Plus",
                    fill: 'lightgray',
                    offset: {
                        x: .5,
                        y: .85
                    }
                }
                obj.collapseIcon.offset = {
                    x: .5,
                    y: .85
                }
                obj.collapseIcon.height = 15;
                obj.collapseIcon.width = 15;
                obj.collapseIcon.shape = "Minus";
                obj.height = 50;
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                obj.style = {
                    fill: 'transparent',
                    strokeWidth: 2
                };
                return obj;
            }
        }
        // define the connector defaults
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.targetDecorator.shape = 'None';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree, LayoutAnimation]}/>
        </DiagramComponent>, document.getElementById("diagram") );

In the previous example, while expanding/collapsing a node, it is set as fixed node in order to prevent it from repositioning.

Refresh layout Diagram allows to refresh the layout at runtime. To refresh the layout, refer to Refresh layout.

setNodeTemplate The setNodeTemplate function is provided for the purpose of customizing nodes. It will be called for each node on node initialization. In this function, the node style and its properties can be customized and can bind the custom JSON with node.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    Inject,
    ConnectorModel,
    NodeModel,
    DiagramConstraints,
    HierarchicalTree,
    TextModel,
    DataBinding,
    Rect
} from "@syncfusion/ej2-react-diagrams";
import {
    DataManager,
    Query
} from '@syncfusion/ej2-data';
//Initializes data source
let data: object[] = [{
        Name: "Steve-Ceo"
    },
    {
        Name: "Kevin-Manager",
        ReportingPerson: "Steve-Ceo",
        color: 'darkcyan'
    },
    {
        Name: "Peter-Manager",
        ReportingPerson: "Steve-Ceo",
        color: 'white'
    },
    {
        Name: "John- Manager",
        ReportingPerson: "Peter-Manager",
        color: 'darkcyan'
    },
    {
        Name: "Mary-CSE ",
        ReportingPerson: "Peter-Manager",
        color: 'white'
    },
    {
        Name: "Jim-CSE ",
        ReportingPerson: "Kevin-Manager",
        color: 'darkcyan'
    },
    {
        Name: "Martin-CSE",
        ReportingPerson: "Kevin-Manager",
        color: 'white'
    }
];

let items: DataManager = new DataManager(data as JSON[], new Query().take(7));
// Initializes the diagram
ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '550px'
        }
        layout = {
            {
                type: 'HierarchicalTree',
                bounds: new Rect(0, 0, 500, 500),
                horizontalSpacing: 25,
                verticalSpacing: 30,
                horizontalAlignment: 'Left',
                verticalAlignment: 'Top'
            }
        }
        dataSourceSettings = {
            {
                id: 'Name',
                parentId: 'ReportingPerson',
                dataManager: items
            }
        }
        getNodeDefaults = {
            (obj: Node) => {
                obj.shape = {
                    type: 'Text',
                    content: (obj.data as {
                        Name: 'string'
                    }).Name
                };
                obj.style = {
                    fill: 'None',
                    strokeColor: 'none',
                    strokeWidth: 2,
                    bold: true,
                    color: 'white'
                };
                obj.width = 50;
                obj.height = 40;
                obj.borderColor = 'white';
                obj.backgroundColor = '#6BA5D7';
                obj.borderWidth = 1;
                (obj.shape as TextModel).margin = {
                    left: 25,
                    right: 25,
                    top: 25,
                    bottom: 25
                };
                return obj;
            }
        }
        getConnectorDefaults = {
            (connector: ConnectorModel, diagram: Diagram) => {
                connector.style = {
                    strokeColor: '#6BA5D7',
                    strokeWidth: 2
                };
                connector.targetDecorator.style.fill  =  '#6BA5D7';
                connector.targetDecorator.style.strokeColor  =  '#6BA5D7';
                connector.targetDecorator.shape = 'None';
                connector.type = 'Orthogonal';
                return connector;
            }
        }
        setNodeTemplate = {
            function(obj, diagram) {
                obj.style.borderColor = (obj.data as {
                    color: 'string'
                }).color;
            }
        }
        ><Inject services = {[DataBinding, HierarchicalTree]}/>
        </DiagramComponent>, document.getElementById("diagram") );