How to Add Annotation Constraints in Angular Diagram?

This article explains how to add annotation constraints in Angular Diagram. We will explore how to apply annotation constraints to dynamically added annotations during the TextEdit event in the Angular Diagram component.

When you double-click an annotation on a node or connector, an edit box appears, allowing you to modify its content. Once the content is edited, the TextEdit event is triggered. During this event, you can retrieve the modified node or connector object and apply annotation constraints to it.

Below is the sample code to handle modifications during the TextEdit event:

public textEdit = function (args: ITextEditEventArgs): void {
    let element = args.element;
    if (element && element.annotations) {
      if (element.annotations.length > 0) {
        element.annotations[0].constraints =
        AnnotationConstraints.Interaction | AnnotationConstraints.Drag;
      }
    }
  }; 

Explanation of the code:

• After editing, the modified node or connector is accessed via args.element.
• If the element contains annotations, the Interaction and Drag constraints are applied to the first annotation.

Refer to the following example for a practical implementation: Sample

Conclusion

We hope you enjoyed learning how to Add Annotation Constraints 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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