How to create and update annotation template dynamically in React Diagram?

This article explains how to create and update annotation templates dynamically in React Diagram.
In React Diagram, an annotation is a block of text that can be displayed over a node or connector. An annotation is used to textually represent an object with a string that can be edited at runtime. The diagram provides either an HTML or SVG template for 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.

please refer to the code snippet below:

//Initializes diagram control
   let diagram: Diagram;
   <diagramcomponent id="diagram" ref="{diagram" ==""> (diagramInstance = diagram)} 
   width={"100%"} height={"645px"} 
   nodes={nodes} connectors={connections} >
   </diagramcomponent>

//initilaize the nodes and connectors
let nodes = [
  {
    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>',
    },]
  },  ]
let connectors= [
  {
    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 },
      }
    ],
  },
 
];

The provided code sets initial annotation templates for a node and a connector.

Additionally, annotation templates can be changed dynamically in response to user actions. The code snippet below illustrates how to update the annotation template for a node and a connector on a button click:

 function add(){
       diagramInstance.connectors[0].annotations[0].template =
       '<div><input type="button" value="connector"></div>';
 
       diagramInstance.nodes[0].annotations[0].template =
       '<div><input type="button" value="Node"></div>';
   }

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 about how to create and update annotation templates dynamically in React Diagram.

You can refer to our React Diagram feature tour page to know about its other groundbreaking feature representations and documentations. You can also explore our React Diagram example to understand how to present and manipulate data.

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