How to show or hide userHandles based on some constraints

This article explains how to show or hide user handles based on certain constraints. The UserHandle feature is utilized to add frequently used commands around the selector in a diagram. The user handle is visible only when a node with a value is selected. This blog will detail how to dynamically show or hide user handles for diagram objects using the SelectionChange event.

To hide the user handle in a node, set the visibility of the diagram's selection item's user handles to false. This ensures that the user handle is not visible when a node is selected.

Here's an example of how to set the user handle visibility to false for a node:

JS

function selectionChange(args) {
        if (args.state === 'Changed' && args.type === 'Addition') {
            if ((args.newValue[0] instanceof ej.diagrams.Node) && args.newValue[0].id === "node1")
                // Hides the userhandle for specified node id
                diagram.selectedItems.userHandles[0].visible = false;
            else if ((args.newValue[0]instanceof ej.diagrams.Connector) && args.newValue[0].id === "connector1")
               // Hides the userhandle for specified connector id
               diagram.selectedItems.userHandles[0].visible = false;
            else {
               // Sets the visible property to true
                diagram.selectedItems.userHandles[0].visible = true;
            }
        }
    }
 

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

Conclusion

We hope you enjoyed learning about how to load an SVG file into a diagram.

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

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