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Annotation in React Diagram component

28 Jan 2022 / 21 minutes to read

Annotation is a block of text that can be displayed over a node or connector. Annotation is used to textually represent an object with a string that can be edited at runtime. Multiple annotations can be added to a node/connector.

Create annotation

An annotation can be added to a node/connector by defining the annotation object and adding that to the annotation collection of the node/connector. The content property of annotation defines the text to be displayed. The following code illustrates how to create a annotation.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
    Diagram,
    DiagramComponent,
    NodeModel, ConnectorModel
} from "@syncfusion/ej2-react-diagrams";
let diagramInstance: DiagramComponent;

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
    // Position of the node
    offsetX: 100,
    offsetY: 100,
    // Size of the node
    width: 100,
    height: 100,
    style: {
        fill: '#6BA5D7',
        strokeColor: 'white'
    },
    // Sets the Annotation for the Node
    annotations: [{
        // Sets the text to be displayed
        content: 'Annotation'
    }]
}];

let connector: ConnectorModel[] = [{
    sourcePoint: {
        x: 300,
        y: 100
    },
    targetPoint: {
        x: 400,
        y: 300
    },
    type: 'Orthogonal',
    style: {
        strokeColor: '#6BA5D7'
    },
    // Sets the Annotation for the Connector
    annotations: [{
        // Sets the text to be displayed
        content: 'Annotation'
    }]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
        width = {
            '100%'
        }
        height = {
            '600px'
        }
        // Add node
        nodes = {
            node
        }
        connectors = {
            connector
        }
        // render initialized Diagram
        />,   document.getElementById("diagram") );

Add annotations at runtime

Annotations can be added at runtime by using the client-side method addLabels. The following code illustrates how to add a annotation to a node.
The annotation’s ID property is used to define the name of the annotation and its further used to find the annotation at runtime and do any customization.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
NodeModel,
DiagramComponent,
ShapeAnnotationModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
// Position of the node
offsetX: 250,
offsetY: 250,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
}];
let diagramInstance: DiagramComponent;

let annotation: ShapeAnnotationModel[] = [{
id: 'label1',
content: 'Annotation'
}];

// initialize Diagram component
ReactDOM.render( <DiagramComponent id = "diagram" ref={diagram => (diagramInstance = diagram)}
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    created = {
        () => {
            //Method to add labels at run time
            diagramInstance.addLabels(diagramInstance.nodes[0], annotation);
            diagramInstance.dataBind();
        }
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Remove annotation

A collection of annotations can be removed from the node by using client-side method removeLabels. The following code illustrates how to remove a annotation to a node.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel,
ShapeAnnotationModel
} from "@syncfusion/ej2-react-diagrams";

let diagramInstance: DiagramComponent;

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
// Position of the node
offsetX: 250,
offsetY: 250,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Annotation'
}]
}];
// initialize Diagram component

ReactDOM.render( <DiagramComponent
    id = "diagram"
    ref={diagram => (diagramInstance = diagram)}
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    created = {
        () => {
             diagramInstance.nodes[0].annotations[0].content = 'Updated Annotation';
            //Method to update the annotation at run time
            diagramInstance.dataBind();
        }
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Update annotation at runtime

You can change any annotation properties at runtime and update it through the client-side method dataBind.

The following code example illustrates how to change the annotation properties.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel,
ShapeAnnotationModel
} from "@syncfusion/ej2-react-diagrams";

let diagramInstance: DiagramComponent;

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
// Position of the node
offsetX: 250,
offsetY: 250,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Annotation'
}]
}];
// initialize Diagram component

ReactDOM.render( < DiagramComponent id = "diagram" ref={diagram => diagramInstance = diagram}
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );
             diagramInstance.nodes[0].annotations[0].content = 'Updated Annotation';
            //Method to update the annotation at run time
            diagramInstance.dataBind();

Alignment

Annotation can be aligned relative to the node boundaries. It has margin, offset, horizontal, and vertical alignment settings. It is quite tricky when all four alignments are used together but gives more control over alignment.

Offset

The offset property of annotation is used to align the annotations based on fractions. 0 represents top/left corner, 1 represents bottom/right corner, and 0.5 represents half of width/height.

Set the size for a nodes annotation by using width and height properties.

The following code shows the relationship between the annotation position (black color circle) and offset (fraction values).

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel,
ShapeAnnotationModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
// Position of the node
offsetX: 250,
offsetY: 250,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    // Sets the content for the annotation
    content: 'Annotation',
    //Sets the offset for the content
    offset: {
        x: 0,
        y: 1
    }
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Horizontal and vertical alignment

The horizontalAlignment property of annotation is used to set how the annotation is horizontally aligned at the annotation position determined from the fraction values. The verticalAlignment property is used to set how annotation is vertically aligned at the annotation position.

The following tables illustrates all the possible alignments visually with ‘offset (0, 0)‘.

Horizontal Alignment	Vertical Alignment	Output with Offset(0,0)
Left	Top
Center	Top
Right	Top
Left	Center
Center	Center
Right	Center
Left	Bottom
Center	Bottom
Right	Bottom

The following codes illustrates how to align annotations.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel,
ShapeAnnotationModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
// Position of the node
offsetX: 250,
offsetY: 250,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Annotation',
    // Sets the horizontal alignment as left
    horizontalAlignment: 'Left',
    // Sets the vertical alignment as Center
    verticalAlignment: 'Center'
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Annotation alignment with respect to segments

The offset and alignment properties of annotation allows you to align the connector annotations with respect to the segments.

The following code example illustrates how to align connector annotations.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel, ConnectorModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Task1'
}]
}, {
id: 'node2',
// Position of the node
offsetX: 300,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Task2'
}]
}];

let connector: ConnectorModel[] = [{
sourceID: 'node1',
targetID: 'node2',
type: 'Orthogonal',
style: {
    strokeColor: '#6BA5D7',
    strokeWidth: 2
},
// Sets the annotation for the connector
annotations: [{
    content: '0',
    // Sets the offset for the content
    offset: 0
}, {
    content: '1',
    // Sets the offset for the content
    offset: 1
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    connectors = {
        connector
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Margin

Margin is an absolute value used to add some blank space in any one of its four sides. The annotations can be displaced with the margin property. The following code example illustrates how to align a annotation based on its offset, horizontalAlignment, verticalAlignment, and margin values.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.

let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the connector
annotations: [{
    content: 'Task1',
    // Sets the margin for the content
    margin: {
        top: 10
    },
    horizontalAlignment: 'Center',
    verticalAlignment: 'Top',
    offset: {
        x: 0.5,
        y: 1
    }
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Text align

The textAlign property of annotation allows you to set how the text should be aligned (left, right, center, or justify) inside the text block. The following codes illustrate how to set textAlign for an annotation.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.

let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the NOde
annotations: [{
    content: 'Text align is set as Left',
    // Sets the textAlign as left for the content
    style: {
        textAlign: 'Left'
    }
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Hyperlink

Diagram provides a support to add a hyperlink for the nodes/connectors annotation. It can also be customized.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.

let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the Node
annotations: [{
    hyperlink: {
        link: 'https://hr.syncfusion.com/home'
    }
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Template Support for Annotation

Diagram provides template support for annotation. you should define a SVG/HTML content as string in the annotation’s template property.

The following code illustrates how to define a template in node’s annotation. similarly, you can define it in connectors.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel,
ConnectorModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.

let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the Node
annotations: [{
    // Set an template for annotation
    template: '<div><input type="button" value="Submit"></div>'
}]
}];

let connector: ConnectorModel[] = [{
sourcePoint: {
    x: 300,
    y: 100
},
targetPoint: {
    x: 400,
    y: 300
},
type: 'Orthogonal',
style: {
    strokeColor: '#6BA5D7'
},
// Sets the Annotation for the Connector
annotations: [{
   // Set an template for annotation
   height: 60, width: 100, offset: 0.5,
   template: '<div><input type="button" value="Submit"></div>'
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    connectors = {
        connector
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Wrapping

When text overflows node boundaries, you can control it by using text wrapping. So, it is wrapped into multiple lines. The wrapping property of annotation defines how the text should be wrapped. The following code illustrates how to wrap a text in a node.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
//Sets the annotation for the node
annotations: [{
    content: 'Annotation Text Wrapping',
    // Sets the style for the text wrapping
    style: {
        textWrapping: 'Wrap'
    }
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Value	Description	Image
No Wrap	Text will not be wrapped.
Wrap	Text-wrapping occurs, when the text overflows beyond the available node width.
WrapWithOverflow (Default)	Text-wrapping occurs, when the text overflows beyond the available node width. However, the text may overflow beyond the node width in the case of a very long word.

Text overflow

The label’s TextOverflow property is used control whether to display the overflowed content in node or not.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Annotation Text',
    // Sets the style for the text to be displayed
    style: {
        textOverflow: 'Ellipsis'
    }
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Appearance

You can change the font style of the annotations with the font specific properties (fontSize, fontFamily, color). The following code illustrates how to customize the appearance of the annotation.
The label’s bold, italic, and textDecoration properties are used to style the label’s text.
The label’s fill, strokeColor, and strokeWidth properties are used to define the background color and border color of the annotation and the opacity property is used to define the transparency of the annotations.
The visible property of the annotation enables or disables the visibility of annotation.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Annotation Text',
    // Sets the style for the text to be displayed
    style: {
        color: 'black',
        bold: true,
        italic: true,
        fontSize: 12,
        fontFamily: 'TimesNewRoman'
    }
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

The fill, border, and opacity appearances of the text can also be customized with appearance specific properties of annotation. The following code illustrates how to customize background, opacity, and border of the annotation.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Annotation Text',
    style: {
        color: 'black',
        fill: 'white',
        opacity: 0.7,
        strokeColor: 'black',
        strokeWidth: 2
    }
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Interaction

Diagram allows annotation to be interacted by selecting, dragging, rotating, and resizing. Annotation interaction is disabled, by default. You can enable annotation interaction with the constraints property of annotation. You can also curtail the services of interaction by enabling either selecting, dragging, rotating, or resizing individually with the respective constraints property of annotation. The following code illustrates how to enable annotation interaction.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel,
AnnotationConstraints
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Annotation Text',
    //Sets the constraints as Interaction
    constraints: AnnotationConstraints.Interaction
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Edit

Diagram provides support to edit an annotation at runtime, either programmatically or interactively. By default, annotation is in view mode. But it can be brought to edit mode in two ways;

Programmatically By using startTextEdit method, edit the text through programmatically.
Interactively
By double-clicking the annotation.
By selecting the item and pressing the F2 key.

Double-clicking any annotation will enables editing and the node enables first annotation editing. When the focus of editor is lost, the annotation for the node is updated. When you double-click on the node/connector/diagram model, the doubleClick event gets triggered.

Read-only annotations

Diagram allows to create read-only annotations. You have to set the read-only property of annotation to enable/disable the read-only constraints. The following code illustrates how to enable read-only mode.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel,
AnnotationConstraints
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the annotation for the node
annotations: [{
    content: 'Annotation Text',
    //Sets the constraints as Read only
    constraints: AnnotationConstraints.ReadOnly
}]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Drag Limit

The diagram control now supports defining the dragLimit to the label while dragging from the connector and also update the position to the nearest segment offset.
You can set the value to dragLimit left, right, top, and bottom properties which allow the dragging of connector labels to a certain limit based on the user defined values.
By default, drag limit will be disabled for the connector. It can be enabled by setting connector constraints as drag.
The following code illustrates how to set a dragLimit for connector annotations.

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
ConnectorModel,
AnnotationConstraints
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let connector: ConnectorModel[] = [{
   id: 'connector2',
   type: 'Orthogonal',
   sourcePoint: { x: 300, y: 300 },
   targetPoint: { x: 400, y: 400 },
   annotations: [
  {
    content: 'connector1', offset:0.5,
    //Enables drag constraints for a connector.
    constraints:AnnotationConstraints.Interaction | AnnotationConstraints.Drag,
    //Set drag limit for a connector annotation.
    dragLimit:{left:20,right:20,top:20,bottom:20}
  }
   ],
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Multiple annotations

You can add any number of annotations to a node or connector. The following code illustrates how to add multiple annotations to a node.

Source

Preview

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import {
Diagram,
DiagramComponent,
NodeModel,
AnnotationConstraints
} from "@syncfusion/ej2-react-diagrams";

// A node is created and stored in nodes array.
let node: NodeModel[] = [{
id: 'node1',
// Position of the node
offsetX: 100,
offsetY: 100,
// Size of the node
width: 100,
height: 100,
style: {
    fill: '#6BA5D7',
    strokeColor: 'white'
},
// Sets the multiple annotation for the node
annotations: [{
        content: 'Left',
        offset: {
            x: 0.12,
            y: 0.1
        }
    },
    {
        content: 'Center',
        offset: {
            x: 0.5,
            y: 0.5
        }
    },
    {
        content: 'Right',
        offset: {
            x: 0.82,
            y: 0.9
        }
    }
]
}];

// initialize Diagram component

ReactDOM.render( <DiagramComponent id = "diagram"
    width = {
        '100%'
    }
    height = {
        '600px'
    }
    // Add node
    nodes = {
        node
    }
    // render initialized Diagram
    />,   document.getElementById("diagram") );

Constraints

The constraints property of annotation allows you to enable/disable certain annotation behaviors. For instance, you can disable annotation editing.

Please provide additional information

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