How to create and update annotation template dynamically in Angular Diagram

This article explains how to create and update annotation template dynamically in Angular Diagram. In Angular Diagram, 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. Diagram provides either an HTML or SVG template to node and connector annotations. To do this, simply access the annotation template property and specify the desired template. The template should be in a string format. To see an example of how to set an annotation template for a node and connector.

Refer to the code snippet below:

//initilaize the diagram
<ejs-diagram
        #diagram
        id="diagram"
        width="100%"
        height="780px"
        [nodes]="nodes"
        [connectors]="connectors"
 >
 </ejs-diagram>
 

 //initilaize the nodes and connectors
public nodes: NodeModel[] = [
    {
      id: 'node1',
      width: 100,
      height: 100,
      offsetX: 100,
      offsetY: 100,
      annotations:[ {
        content: '|||',
        template:
        '<div><img src = "https://www.freepnglogos.com/uploads/plus-icon/plus-icon-plus-math-icon-download-icons-9.png" height = "30" weight = "30"/></div>',
      },]
    },  ]
  public connectors: ConnectorModel[] = [
    {
      id: 'connector4',
      sourcePoint: { x: 250, y: 400 },
      targetPoint: { x: 400, y: 400 },
      annotations: [
        {
          content: 'F',
          offset: 1,
          margin: { bottom: 20 },
          template: '<div><input type="button" value="Submit"></div>',
        },
        {
          offset: 0.5,
          content: 'HTML Template',
          margin: { top: 20 },
        }
      ],
    },
   
  ];

<button (click)="updateTemplate()">Update template</button>

public updateTemplate () {

// Set the annotation template for node and connector annotation 
 this.diagram.connectors[0].annotations[0].template = '<div><input type="button" value="hello"></div>';
 this.diagram.nodes[0].annotations[0].template = '<div><input type="button" value="Button"></div>';
// To reflect the changes in diagram
    this.diagram.dataBind();
}

This code dynamically changes the annotation templates for a node and a connector, followed by updating the diagram to reflect the changes.

 Refer to the working sample for additional details and implementation: sample 

Conclusion

We hope you enjoyed learning how to create and update annotation template dynamically in Angular Diagram.

You can refer to our Angular Diagram feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our Angular Diagram example to understand how to create and manipulate data.

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