Tree Layout with small image indicating valid or invalid nodes

GoJS
1

Sample GoJS Tree View displays the Tree view.

What I need is to display of small image on existing picture (open folder , closed folder or document) to indicate whether the node is valid or not (Visual representation with small green correct mark or red - cross mark)

Can you provide the modified template for same?

2

There are several ways for you to go.

You could have several different images. Bind the Picture.source to your validity property using a conversion function that returns the appropriate URL.

You could have a separate object to indicate validity. Bind its GraphObject.visible or GraphObject.opacity property to your validity property.
http://gojs.net/latest/intro/nodes.html

There are other possibilities as well, but this is probably enough for you to implement what you decide you want.