Customizing layout in Angular Diagram control

28 Mar 202524 minutes to read

Orientation, spacings, and alignment 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.

The following example shows how to align the layout within the given layout bounds.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, DiagramModule,
  HierarchicalTreeService, DataBindingService, DataBinding, HierarchicalTree, Rect } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree);

@Component({
  imports: [DiagramModule],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `
  <ejs-diagram #diagram id="diagram" width="100%" height="550px" [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" 
  [layout]="layout" [dataSourceSettings]="dataSourceSettings"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;

  //Initialize data source
  public 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" },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.annotations = [{ content: (node.data as { Name: 'string' }).Name }];
    node.width = 100; node.height = 40;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
      //set bounds for layout
      bounds: new Rect(0, 0, 500, 700)
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

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 and how to change layout horizontal and vertical alignment at runtime.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, DiagramModule, HierarchicalTreeService,
  DataBindingService, DataBinding, HierarchicalTree, HorizontalAlignment, VerticalAlignment } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree);

@Component({
  imports: [DiagramModule],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `
  <label for="horizontalAlignment">Horizontal Alignment : </label>
  <select id="horizontalAlignment" (change)="onHorizontalChange($event)">
      <option value="Left">Left</option>
      <option value="Center">Center</option>
      <option value="Right">Right</option>
    </select>
  <label for="verticalAlignment">Vertical Alignment : </label>
    <select id="verticalAlignment" (change)="onVerticalChange($event)">
      <option value="Top">Top</option>
      <option value="Center">Center</option>
      <option value="Bottom">Bottom</option>
    </select>
  <ejs-diagram #diagram id="diagram" width="100%" height="550px" [getNodeDefaults]="getNodeDefaults"
  [getConnectorDefaults]="getConnectorDefaults" [layout]="layout" [dataSourceSettings]="dataSourceSettings"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;

  //Initialize data source
  public 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" },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel, diagram: Diagram): NodeModel {
    node.annotations = [{ content: (node.data as { Name: 'string' }).Name }];
    node.width = 100; node.height = 40;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
      //set layout alignments
      horizontalAlignment: 'Left',
      verticalAlignment: 'Top'
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

  onHorizontalChange(event: Event) {
    const horizontalAlignment = (event.target as HTMLSelectElement).value as HorizontalAlignment;
    this.diagram.layout.horizontalAlignment = horizontalAlignment;
    this.diagram.dataBind();
  }

  onVerticalChange(event: Event) {
    const verticalAlignment = (event.target as HTMLSelectElement).value as VerticalAlignment;
    this.diagram.layout.verticalAlignment = verticalAlignment;
    this.diagram.dataBind();
  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

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.

The following code illustrates how to set the initial horizontal and vertical spacing for the layout, as well as how to change these spacing values at runtime

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, DiagramModule,
  HierarchicalTreeService, DataBindingService, DataBinding, HierarchicalTree } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree);

@Component({
  imports: [DiagramModule],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `
  <label for="horizontalSpacing">Horizontal Spacing : </label>
  <input type="number" id="horizontalSpacing" value="30" (change)="onHorizontalChange($event)">
  <label for="verticalSpacing">Vertical Spacing : </label>
  <input type="number" id="verticalSpacing" value="30" (change)="onVerticalChange($event)">
  <ejs-diagram #diagram id="diagram" width="100%" height="550px" [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" 
  [layout]="layout" [dataSourceSettings]="dataSourceSettings"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;

  //Initialize data source
  public 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" },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.annotations = [{ content: (node.data as { Name: 'string' }).Name }];
    node.width = 100; node.height = 40;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
      //set layout spacing
      horizontalSpacing: 30,
      verticalSpacing: 30,
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

  onHorizontalChange(event: Event) {
    let horizontalSpacing = Number((event.target as HTMLSelectElement).value);
    if (horizontalSpacing < 20) {
      horizontalSpacing = 20;
    }
    if (horizontalSpacing > 100) {
      horizontalSpacing = 100;
    }
    this.diagram.layout.horizontalSpacing = horizontalSpacing;
    this.diagram.dataBind();
  }

  onVerticalChange(event: Event) {
    let verticalSpacing = Number((event.target as HTMLSelectElement).value);
    if (verticalSpacing < 20) {
      verticalSpacing = 20;
    }
    if (verticalSpacing > 100) {
      verticalSpacing = 100;
    }
    this.diagram.layout.verticalSpacing = verticalSpacing;
    this.diagram.dataBind();
  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

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 demonstrates how to set the initial layout margin and how to modify the layout margin dynamically at runtime.

app.component.ts

import { Component, OnInit, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, DecoratorModel, ShapeStyleModel, HierarchicalTree, TextModel,
  DiagramModule, HierarchicalTreeService, DataBindingService, DataBinding, Rect, MarginModel } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree);


@Component({
  imports: [DiagramModule],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `
  <label for="marginLeft">Margin Left : </label>
  <input type="number" id="marginLeft" value="100" (change)="onLeftChange($event)">
  <label for="marginTop">Margin Top : </label>
  <input type="number" id="marginTop" value="100" (change)="onTopChange($event)">
  <ejs-diagram #diagram id="diagram" width="100%" height="550px" [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" 
  [layout]="layout" [dataSourceSettings]="dataSourceSettings"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;

  //Initialize data source
  public 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" },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.annotations = [{ content: (node.data as { Name: 'string' }).Name }];
    node.width = 100; node.height = 40;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
      //Sets layout alignment
      horizontalAlignment: 'Left',
      verticalAlignment: 'Top',
      margin: { left: 100, top: 100 },
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

  onLeftChange(event: Event) {
    let leftValue = Number((event.target as HTMLSelectElement).value);
    if (leftValue < 20) {
      leftValue = 20;
    }
    if (leftValue > 500) {
      leftValue = 500;
    }
    (this.diagram.layout.margin as MarginModel).left = leftValue;
    this.diagram.dataBind();
  }

  onTopChange(event: Event) {
    let topValue = Number((event.target as HTMLSelectElement).value);
    if (topValue < 20) {
      topValue = 20;
    }
    if (topValue > 500) {
      topValue = 500;
    }
    (this.diagram.layout.margin as MarginModel).top = topValue;
    this.diagram.dataBind();
  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Layout orientation

The layout orientation can used to arrange the layout based on the direction. there are different orientation types that are defined in the following table.

Orientation	Description
TopToBottom	Aligns the layout from top to bottom. All the roots are placed at top of diagram.
LeftToRight	Aligns the layout from left to right. All the roots are placed at left of diagram.
BottomToTop	Aligns the layout from bottom to top. All the roots are placed at bottom of the diagram.
RightToLeft	Aligns the layout from right to left. All the roots are placed at right of the diagram.

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

NOTE

In the diagram the default orientation is TopToBottom.

The following code demonstrates how to set the initial orientation for the layout and how to change it dynamically at runtime.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, DiagramModule,
  HierarchicalTree, LayoutOrientation, HierarchicalTreeService, DataBindingService, DataBinding } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree);


@Component({
  imports: [DiagramModule],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `
  <label for="orientation">Orientation : </label>
  <select id="orientation" (change)="onOrientationChange($event)">
      <option value="TopToBottom">TopToBottom</option>
      <option value="BottomToTop">BottomToTop</option>
      <option value="LeftToRight">LeftToRight</option>
      <option value="RightToLeft">RightToLeft</option>
    </select>

  <ejs-diagram #diagram id="diagram" width="100%" height="550px" [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" 
  [layout]="layout" [dataSourceSettings]="dataSourceSettings"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;

  //Initialize data source
  public 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" },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.annotations = [{ content: (node.data as { Name: 'string' }).Name }];
    node.width = 100; node.height = 40;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
      //Sets layout alignment
      horizontalAlignment: 'Left',
      verticalAlignment: 'Top',
      orientation: 'TopToBottom',
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

  onOrientationChange(event: Event) {
    let orientation = (event.target as HTMLSelectElement).value as LayoutOrientation;
    this.diagram.layout.orientation = orientation;
    this.diagram.dataBind();
  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Exclude from layout

In some cases, you may need one or two nodes not to be arranged based on the layout algorithm but instead positioned manually. You can exclude these nodes from the layout algorithm by setting the excludeFromLayout property to true.

The following code example demonstrates how to exclude a node from the layout and position it manually:

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramModule, DataBindingService, DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel,
  DataSourceModel, DataBinding, HierarchicalTree, HierarchicalTreeService } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree);

@Component({
  imports: [DiagramModule],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `
  <ejs-diagram #diagram id="diagram" width="100%" height="590px" [layout]="layout" [dataSourceSettings]="dataSourceSettings"
  [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" > </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout: LayoutModel = {};
  public dataSourceSettings: DataSourceModel = {};

  //Initialize data source
  public data: object[] = [
    {
      Name: 'Steve-Ceo',
    },
    {
      Name: 'Kevin-Manager',
      ReportingPerson: 'Steve-Ceo',
    },
    {
      Name: 'Robert',
      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',
    },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.width = 100;
    node.height = 50;
    node.annotations = [{ content: (node.data as { Name: 'string'; }).Name }];

    if ((node.data as any).Name === 'Robert') {
      //Excludes node from layout
      node.excludeFromLayout = true;
      node.offsetX = 150;
      node.offsetY = 75;
    }

    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

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.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, SnapSettingsModel, LayoutModel,
  DataSourceModel, DiagramModule, DataBindingService, DataBinding, FlowchartLayout, FlowchartLayoutService } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';
Diagram.Inject(DataBinding, FlowchartLayout);

@Component({
  imports: [DiagramModule],

  providers: [FlowchartLayoutService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `<ejs-diagram #diagram id="diagram" width="100%" height="580px" [getNodeDefaults]="getNodeDefaults"
  [getConnectorDefaults]="getConnectorDefaults" [snapSettings]="snapSettings" [layout]="layout" [dataSourceSettings]="dataSourceSettings">
    </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram?: DiagramComponent;
  public snapSettings?: SnapSettingsModel;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;

  //Initializes data source
  public 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"
    }
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel, diagram: Diagram): NodeModel {
    node.annotations = [{ content: (node.data as { Name: 'string' }).Name }];
    node.width = 100; node.height = 40;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel, diagram: Diagram): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      type: 'Flowchart',
      fixedNode:'Steve-Ceo'
    }
    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }
  }
}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

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.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, DecoratorModel, DiagramModule, DataBindingService, SnapSettingsModel,
  SelectorModel, SelectorConstraints, TreeInfo, DataBinding, HierarchicalTree, HierarchicalTreeService } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree);

@Component({
  imports: [
    DiagramModule
  ],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `
  <ejs-diagram #diagram id="diagram" width="100%" height="590px" [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" 
  [layout]="layout" [snapSettings]="snapSettings" [selectedItems]="selectedItems" [dataSourceSettings]="dataSourceSettings"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout: LayoutModel = {};
  public dataSourceSettings: DataSourceModel = {};
  public snapSettings: SnapSettingsModel = {};
  public selectedItems: SelectorModel = {};

  //Initialize data source
  public 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'
    }
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.expandIcon = {
      height: 15,
      width: 15,
      shape: "Plus",
      fill: 'lightgray',
      offset: { x: .5, y: .85 }
    }
    node.collapseIcon = {
      height: 15,
      width: 15,
      shape: "Minus",
      offset: { x: .5, y: .85 },
    }
    node.height = 50; node.width = 50; 
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    (connector.targetDecorator as DecoratorModel).shape = "None";
    return connector;
  }

  ngOnInit(): void {

    this.selectedItems = { constraints: ~SelectorConstraints.ResizeAll }
    this.snapSettings = { constraints: 0 }
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'OrganizationalChart',
      // define the getLayoutInfo
      getLayoutInfo: (tree: TreeInfo | any) => {
        if (!tree.hasSubTree) {
          tree.orientation = 'vertical';
          tree.type = 'alternate';
        }
      }
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Id',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

For more details about customizing the expand and collapse icon refer expand Collapse

Layout animation

While performing expand and collapse operations, the layout can be animated by applying a small delay. This can be achieved by setting the enableAnimation property of the layout. By default, enableAnimation is set to true.

In the following example, the enableAnimation property ensures that the layout changes are animated, enhancing the visual experience during expand and collapse operations.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, DiagramModule, HierarchicalTreeService,
  DataBindingService, DataBinding,  LayoutAnimation, LayoutAnimationService,  HierarchicalTree } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree, LayoutAnimation);


@Component({
  imports: [DiagramModule],

  providers: [HierarchicalTreeService, DataBindingService, LayoutAnimationService],
  standalone: true,
  selector: "app-container",
  template: `
  <ejs-diagram #diagram id="diagram" width="100%" height="550px" [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" 
  [layout]="layout" [dataSourceSettings]="dataSourceSettings"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;

  //Initialize data source
  public data: object[] = [
    { Name: "Steve-Ceo" },
    { Name: "Kevin-Manager", ReportingPerson: "Steve-Ceo" },
    { Name: "Robert-Manager", ReportingPerson: "Steve-Ceo" },
    { Name: "Peter-Manager", ReportingPerson: "Kevin-Manager" },
    { Name: "Hary-Manager", ReportingPerson: "Robert-Manager" },
    { Name: "John-Manager", ReportingPerson: "Hary-Manager" },
    { Name: "Mary-CSE", ReportingPerson: "Hary-Manager" },
    { Name: "John-Manager", ReportingPerson: "Peter-Manager" },
    { Name: "Mary-CSE ", ReportingPerson: "Peter-Manager" },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.annotations = [{ content: (node.data as { Name: 'string' }).Name }];
    node.expandIcon = { shape: "Minus" };
      node.collapseIcon = { shape: "Plus" };
      node.width = 100;
    node.height = 40;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
      enableAnimation: true,
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

NOTE

To enable layout animation, you need to inject LayoutAnimation module in diagram.

Parent - child relation with dropped nodes from symbol palette

You can create a layout with dropped nodes from symbol palette using the drop event. In drop event, you have to create a connection between the source and target item.

Find the code example to create parent - child relation between source and target nodes in drop event.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, HierarchicalTree, PaletteModel, NodeConstraints,
  IDropEventArgs, randomId, DiagramModule, HierarchicalTreeService, DataBindingService, DataBinding, SymbolPaletteModule } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';
import { ExpandMode } from '@syncfusion/ej2-navigations';

Diagram.Inject(DataBinding, HierarchicalTree);


@Component({
  imports: [DiagramModule, SymbolPaletteModule],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `<div style="height: 600px; width: 150px; float: left">
  <ejs-symbolpalette id="symbolpalette" width="100%" height="600px" [expandMode]="expandMode" [palettes]="palettes" [symbolHeight]=50 [symbolWidth]=100>
  </ejs-symbolpalette></div>
  <ejs-diagram #diagram id="diagram" width="80%" height="600px" [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" 
  [layout]="layout" [dataSourceSettings]="dataSourceSettings" (drop)="drop($event)"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;
  public expandMode: ExpandMode = 'Multiple';

  //Initialize data source
  public 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" },
  ];

  //Initialize shapes for symbol palette
  public palettes: PaletteModel[] = [
    {
      title: 'Basic shapes',
      id: 'basicShapes',
      symbols: [
        {
          id: 'Node',
          width: 100,
          height: 50,
          data: { Name: 'New Node' },
        },
      ],
    },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.width = 100; node.height = 40;
    node.constraints = NodeConstraints.Default | NodeConstraints.AllowDrop;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    return connector;
  }

  // Handle drop event that create a connection between the source and target item
  public drop(args: IDropEventArgs) {
    setTimeout(() => {
      //Argument element is used to get the dropped node.
      let node: NodeModel = args.element as NodeModel;
      let bottomNode: NodeModel = args.target as NodeModel;
      //Gets the connector that connected to dropped node
      let edges: string[] = this.diagram.getEdges(node);
      if (edges && edges.length > 0) {
        let connector: ConnectorModel = this.diagram.getObject(edges[0]);
        //Argument target is used to get the hovered node
        connector.sourceID = (args.target as NodeModel).id;
        this.diagram.dataBind();
      } else {
        let newCon: ConnectorModel = {
          id: 'newcon' + randomId(),
          sourceID: (args.target as NodeModel).id,
          targetID: (args.element as NodeModel).id,
        };
        if (newCon.sourceID === undefined) {
          newCon.sourceID = this.diagram.nodes[0].id;
        }
        this.diagram.dataBind();
        this.diagram.add(newCon);
      }
      this.diagram.doLayout();
    }, 100);
  }

  ngOnInit(): void {

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

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

setNodeTemplate

The setNodeTemplate function allows you to customize the visual representation and behavior of nodes within your diagram. It is invoked during the initialization of each node, enabling you to define the node’s style, properties, and bind custom JSON data to it.

Typically, the setNodeTemplate function accepts a container element (e.g., StackPanel, Grid) to organize the visual components within the node. In the following example, a StackPanel is used to organize the node’s content, with an ImageElement displaying an image and a TextBlock showing text bound to the “Name” property of the node’s data. The StackPanel can contain a variety of elements, including PathElement,NativeElement,DiagramElement and HtmlElement.
You can also set the cornerRadius to create a rounded appearance for the node, while horizontalAlignment and verticalAlignment control the positioning of the StackPanel within the node.

The orientation property determines whether child elements are arranged horizontally or vertically.By effectively utilizing the setNodeTemplate function, you can create visually appealing and informative nodes that enhance the overall user experience of your diagram.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { DiagramComponent, Diagram, NodeModel, ConnectorModel, LayoutModel, DataSourceModel, DecoratorModel, DiagramModule, HierarchicalTreeService,
  DataBindingService, DataBinding, ImageElement, StackPanel, TextElement, Container, HierarchicalTree } from '@syncfusion/ej2-angular-diagrams';
import { DataManager, Query } from '@syncfusion/ej2-data';

Diagram.Inject(DataBinding, HierarchicalTree);


@Component({
  imports: [DiagramModule],

  providers: [HierarchicalTreeService, DataBindingService],
  standalone: true,
  selector: "app-container",
  template: `
  <ejs-diagram #diagram id="diagram" width="100%" height="550px" [getNodeDefaults]="getNodeDefaults" [getConnectorDefaults]="getConnectorDefaults" 
  [setNodeTemplate]="setNodeTemplate" [layout]="layout" [dataSourceSettings]="dataSourceSettings"> </ejs-diagram>`,
  encapsulation: ViewEncapsulation.None
})

export class AppComponent {
  @ViewChild("diagram")
  public diagram!: DiagramComponent;
  public items?: DataManager;
  public layout?: LayoutModel;
  public dataSourceSettings?: DataSourceModel;

  //Initialize data source
  public 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' },
  ];

  //Sets the default properties for all the Nodes
  public getNodeDefaults(node: NodeModel): NodeModel {
    node.width = 200; node.height = 60;
    return node;
  }

  //Sets the default properties for all the connectors
  public getConnectorDefaults(connector: ConnectorModel): ConnectorModel {
    connector.type = 'Orthogonal';
    (connector.targetDecorator as DecoratorModel).shape = 'None';
    return connector;
  }

  //Function to add the Template of the Node.
  public setNodeTemplate(node: NodeModel): Container {

    // Create an outer StackPanel as container to contain image and text elements
    let container = new StackPanel();
    container.width = 200;
    container.height = 60;
    container.cornerRadius = 10;
    container.style.fill = 'skyblue';
    container.horizontalAlignment = 'Left';
    container.orientation = 'Horizontal';
    container.id = (node.data as any).Name + '_StackContainter';

    // Create an inner image element to displaying image
    let innerContent = new ImageElement();
    innerContent.id = (node.data as any).Name + '_innerContent';
    innerContent.width = 40;
    innerContent.height = 40;
    innerContent.margin.left = 20;
    innerContent.style.fill = 'lightgrey';

    // Create a inner text element for displaying employee details
    let text = new TextElement();
    text.content = 'Name: ' + (node.data as any).Name;
    text.margin = { left: 10, top: 5 };
    text.id = (node.data as any).Name + '_textContent';
    text.style.fill = 'green';
    text.style.color = 'white';
    if ((node.data as any).Name === 'Steve-Ceo') {
      text.style.fill = 'black';
      text.style.color = 'white';
    }

    // Add inner image and text element to the outer StackPanel
    container.children = [innerContent, text];
    return container;
  }


  ngOnInit(): void {
    this.items = new DataManager(this.data as JSON[], new Query().take(7));

    //Uses layout to auto-arrange nodes on the Diagram page
    this.layout = {
      //Sets layout type
      type: 'HierarchicalTree',
    }

    //Configures data source for Diagram
    this.dataSourceSettings = {
      id: 'Name',
      parentId: 'ReportingPerson',
      dataSource: this.items
    }

  }

};

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Refresh layout

Diagram allows refreshing the layout at runtime. To refresh the layout, you need to call the doLayout method.

//To refresh layout
this.diagram.doLayout();