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Getting started with React Diagram component

23 Feb 2021 / 9 minutes to read

This section explains the steps required to create a simple diagram and demonstrates the basic usage of the diagram control.

Dependencies

The following list of dependencies are required to use the Diagram component in your application.

|-- @syncfusion/ej2-react-diagrams
    |-- @syncfusion/ej2-base
    |-- @syncfusion/ej2-data
    |-- @syncfusion/ej2-navigations
    |-- @syncfusion/ej2-inputs
    |-- @syncfusion/ej2-popups
    |-- @syncfusion/ej2-buttons
    |-- @syncfusion/ej2-lists
    |-- @syncfusion/ej2-splitbuttons
    |-- @syncfusion/ej2-diagrams
    |-- @syncfusion/ej2-react-base

Installation and configuration

You can use create-react-app to setup the applications. To install create-react-app run the following command.

npm install -g create-react-app
  • To setup basic React sample use following commands.
create-react-app quickstart --scripts-version=react-scripts-ts

cd quickstart

Adding Syncfusion packages

All the available Essential JS 2 packages are published in Node Package Manager public registry. You can choose the component that you want to install. For this application, we are going to use Diagram component.

To install Diagram component, use the following command

npm install @syncfusion/ej2-react-diagrams –save

Adding Style sheet to the Application

Add Diagram component’s styles as given below in App.css.

@import "../node_modules/@syncfusion/ej2-react-diagrams/styles/material.css";

Adding Diagram component to the Application

  • To include the Diagram component in application import the DiagramComponent from ej2-react-diagrams package.
  • Then add the Diagram component as shown in below code example.

[src/App.tsx]

import * as React from "react";
import "./App.css";
// import the DiagramComponent
import { DiagramComponent } from "@syncfusion/ej2-react-diagrams";

export default class App extends React.Component<{}, {}> {
  render() {
    return <DiagramComponent id="diagram" />;
  }
}

Run the application

Now run the npm start command in the console, it will run your application and open the browser window.

npm start

The below examples shows the basic Diagram component.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { DiagramComponent } from "@syncfusion/ej2-react-diagrams";

ReactDOM.render(
  <DiagramComponent id="diagram" width={"100%"} height={"350px"} />,
  document.getElementById("diagram")
);

Module Injection

The diagram component is divided into individual feature-wise modules. In order to use a particular feature, inject the required module. The following list describes the module names and their description.

  • BpmnDiagrams - Inject this provider to add built-in BPMN Shapes to diagrams.
  • ConnectorBridging - Inject this provider to add bridges to connectors.
  • ConnectorEditing - Inject this provider to edit the segments for connector.
  • ComplexHierarchicalTree - Inject this provider to complex hierarchical tree like structure.
  • DataBinding - Inject this provider to populate nodes from given data source.
  • DiagramContextMenu - Inject this provider to manipulate context menu.
  • HierarchicalTree - Inject this provider to use hierarchical tree like structure.
  • LayoutAnimation - Inject this provider animation to layouts.
  • MindMap - Inject this provider to use mind map.
  • PrintAndExport - Inject this provider to print or export the objects.
  • RadialTree - Inject this provider to use Radial tree like structure.
  • Snapping - Inject this provider to Snap the objects.
  • SymmetricLayout - Inject this provider to render layout in symmetrical method.
  • UndoRedo - Inject this provider to revert and restore the changes.

These modules should be imported and injected into the Diagram component using Diagram.Inject method as follows.

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
  DiagramComponent,
  HierarchicalTree,
  MindMap,
  RadialTree,
  ComplexHierarchicalTree,
  DataBinding,
  Snapping,
  PrintAndExport,
  BpmnDiagrams,
  SymmetricLayout,
  ConnectorBridging,
  UndoRedo,
  LayoutAnimation,
  DiagramContextMenu,
  ConnectorEditing
} from "@syncfusion/ej2-react-diagrams";

ReactDOM.render(
  <DiagramComponent id="diagram">
    <Inject
      services={[
        HierarchicalTree,
        MindMap,
        RadialTree,
        ComplexHierarchicalTree,
        DataBinding,
        Snapping,
        PrintAndExport,
        BpmnDiagrams,
        SymmetricLayout,
        ConnectorBridging,
        UndoRedo,
        LayoutAnimation,
        DiagramContextMenu,
        ConnectorEditing
      ]}
    />
  </DiagramComponent>,
  document.getElementById("diagram")
);

Flow Diagram

Create and Add Node

Create and add a node (JSON data) with specific position, size, label, and shape.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { DiagramComponent, NodeModel } from "@syncfusion/ej2-react-diagrams";

let nodes: NodeModel[] = [
  {
    id: "node1",
    height: 100,
    width: 100,
    offsetX: 100,
    offsetY: 200
  }
];

ReactDOM.render(
  <DiagramComponent
    id="diagram"
    width={"100%"}
    height={"350px"}
    nodes={nodes}
  />,
  document.getElementById("diagram")
);

Connect two Nodes with a Connector

Add two node to the diagram as shown in the previous example. Connect these nodes by adding a connector using the connector property and refer the source and target end by using the sourceNode and targetNode properties.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
  DiagramComponent,
  NodeModel,
  ConnectorModel
} from "@syncfusion/ej2-react-diagrams";

let nodes: NodeModel[] = [
  {
    id: "node1",
    height: 100,
    width: 100,
    offsetX: 200,
    offsetY: 100
  },
  {
    id: "node2",
    height: 100,
    width: 100,
    offsetX: 200,
    offsetY: 250
  }
];

let connectors: ConnectorModel[] = [
  {
    id: "connector1",
    sourceID: "node1",
    targetID: "node2"
  }
];

ReactDOM.render(
  <DiagramComponent
    id="diagram"
    width={"100%"}
    height={"350px"}
    nodes={nodes}
    connectors={connectors}
  />,
  document.getElementById("diagram")
);

Default values for all nodes and connectors can be set using the getNodeDefaults and getConnectorDefaults properties, respectively. For example, if all nodes have the same width and height, such properties can be moved into getNodeDefaults.

Complete Flow Diagram

Similarly we can add required nodes and connectors to form a complete flow diagram.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import {
  DiagramComponent,
  NodeModel,
  ConnectorModel
} from "@syncfusion/ej2-react-diagrams";

let nodes: NodeModel[] = [
  {
    id: "node1",
    offsetY: 50,
    shape: { type: "Flow", shape: "Terminator" },
    annotations: [
      {
        content: "Start"
      }
    ]
  },
  {
    id: "node2",
    offsetY: 140,
    shape: { type: "Flow", shape: "Process" },
    annotations: [
      {
        content: "var i = 0;"
      }
    ]
  },
  {
    id: "node3",
    offsetY: 230,
    shape: { type: "Flow", shape: "Decision" },
    annotations: [
      {
        content: "i < 10?"
      }
    ]
  },
  {
    id: "node4",
    offsetY: 320,
    shape: { type: "Flow", shape: "PreDefinedProcess" },
    annotations: [
      {
        content: 'print("Hello!!");'
      }
    ]
  },
  {
    id: "node5",
    offsetY: 410,
    shape: { type: "Flow", shape: "Process" },
    annotations: [
      {
        content: "i++;"
      }
    ]
  },
  {
    id: "node6",
    offsetY: 500,
    shape: { type: "Flow", shape: "Terminator" },
    annotations: [
      {
        content: "End"
      }
    ]
  }
];

let connectors: ConnectorModel[] = [
  {
    id: "connector1",
    sourceID: "node1",
    targetID: "node2"
  },
  {
    id: "connector2",
    sourceID: "node2",
    targetID: "node3"
  },
  {
    id: "connector3",
    sourceID: "node3",
    targetID: "node4",
    annotations: [{ text: "Yes" }]
  },
  {
    id: "connector4",
    sourceID: "node3",
    targetID: "node6",
    labels: [{ text: "No" }],
    segments: [
      { length: 30, direction: "Right" },
      { length: 300, direction: "Bottom" }
    ]
  },
  {
    id: "connector5",
    sourceID: "node4",
    targetID: "node5"
  },
  {
    id: "connector6",
    sourceID: "node5",
    targetID: "node3",
    segments: [
      { length: 30, direction: "Left" },
      { length: 200, direction: "Top" }
    ]
  }
];

ReactDOM.render(
  <DiagramComponent
    id="diagram"
    width={"100%"}
    height={"600px"}
    nodes={nodes}
    connectors={connectors}
    getNodeDefaults={(node: NodeModel): NodeModel => {
      node.height = 50;
      node.width = 140;
      node.offsetX = 300;
      return node;
    }}
    getConnectorDefaults={(obj: ConnectorModel): ConnectorModel => {
      obj.type = "Orthogonal";
    }}
  />,
  document.getElementById("diagram")
);

Automatic Organization Chart

In ‘Flow Diagram’ section we saw how to create a diagram manually, now let us see how to create and position diagram automatically.

Business object (Employee information)

Define Employee Information as JSON data. The following code example shows an employee array whose, Name is used as an unique identifier and ReportingPerson is used to identify the person to whom an employee report to, in the organization.

    public data: Object[] = [
        {
            Name: "Elizabeth",
            Role: "Director"
        },
        {
            Name: "Christina",
            ReportingPerson: "Elizabeth",
            Role: "Manager"
        },
        {
            Name: "Yoshi",
            ReportingPerson: "Christina",
            Role: "Lead"
        },
        {
            Name: "Philip",
            ReportingPerson: "Christina",
            Role: "Lead"
        },
        {
            Name: "Yang",
            ReportingPerson: "Elizabeth",
            Role: "Manager"
        },
        {
            Name: "Roland",
            ReportingPerson: "Yang",
            Role: "Lead"
        },
        {
            Name: "Yvonne",
            ReportingPerson: "Yang",
            Role: "Lead"
        }
    ];

Map data source

You can configure the above “Employee Information” with diagram, so that the nodes and connectors are automatically generated using the mapping properties. The following code example show how dataSourceSettings is used to map ID and parent with property name identifiers for employee information.

export let data: Object[] = [
  {
    Name: "Elizabeth",
    Role: "Director"
  },
  {
    Name: "Christina",
    ReportingPerson: "Elizabeth",
    Role: "Manager"
  },
  {
    Name: "Yoshi",
    ReportingPerson: "Christina",
    Role: "Lead"
  },
  {
    Name: "Philip",
    ReportingPerson: "Christina",
    Role: "Lead"
  },
  {
    Name: "Yang",
    ReportingPerson: "Elizabeth",
    Role: "Manager"
  },
  {
    Name: "Roland",
    ReportingPerson: "Yang",
    Role: "Lead"
  },
  {
    Name: "Yvonne",
    ReportingPerson: "Yang",
    Role: "Lead"
  }
];

let dataSettings: object = {
  id: "Name",
  parentId: "ReportingPerson",
  dataManager: new DataManager(data as JSON[])
}

ReactDOM.render(<DiagramComponent
id="diagram"
width={"100%"}
height={"350px"}
dataSourceSettings={dataSettings}><Inject services={[HierarchicalTree, DataBinding]} /></DiagramComponent>,
document.getElementById("diagram")
);

Visualize employee

Following code examples indicate how to define the default appearance of node and connector using default settings.

Source
Preview
index.tsx
import * as React from "react";
import * as ReactDOM from "react-dom";
import { DiagramComponent } from "@syncfusion/ej2-react-diagrams";
import {
  Node,
  HierarchicalTree,
  Diagram,
  NodeModel,
  ConnectorModel,
  Inject,
  DataBinding
} from "@syncfusion/ej2-react-diagrams";
import { DataManager } from "@syncfusion/ej2-data";

export interface EmployeeInfo {
  Name: string;
  Role: string;
  color: string;
}

export let data: Object[] = [
  {
    Name: "Elizabeth",
    Role: "Director"
  },
  {
    Name: "Christina",
    ReportingPerson: "Elizabeth",
    Role: "Manager"
  },
  {
    Name: "Yoshi",
    ReportingPerson: "Christina",
    Role: "Lead"
  },
  {
    Name: "Philip",
    ReportingPerson: "Christina",
    Role: "Lead"
  },
  {
    Name: "Yang",
    ReportingPerson: "Elizabeth",
    Role: "Manager"
  },
  {
    Name: "Roland",
    ReportingPerson: "Yang",
    Role: "Lead"
  },
  {
    Name: "Yvonne",
    ReportingPerson: "Yang",
    Role: "Lead"
  }
];

let dataSettings: object = {
  id: "Name",
  parentId: "ReportingPerson",
  dataManager: new DataManager(data as JSON[])
}

let layoutSetting: object= { type: "OrganizationalChart" }

ReactDOM.render(<DiagramComponent
id="diagram"
width={"100%"}
height={"350px"}
dataSourceSettings={dataSettings}
layout={layoutSetting}
getNodeDefaults={(node: NodeModel): NodeModel => {
let codes: Object = {
    Director: "rgb(0, 139,139)",
    Manager: "rgb(30, 30,113)",
    Lead: "rgb(0, 100,0)"
};
node.width = 70;
node.height = 30;
node.annotations = [
{ content: (node.data as EmployeeInfo).Name, style: { color: "white" } }
];
node.style.fill = codes[(node.data as EmployeeInfo).Role];
return node;
}}
getConnectorDefaults={(connector: ConnectorModel): ConnectorModel => {
    connector.type = "Orthogonal";
    connector.cornerRadius = 7;
    return connector;
}}><Inject services={[HierarchicalTree, DataBinding]} /></DiagramComponent>,
document.getElementById("diagram")
);
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