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Asked: 2026-05-16T11:14:20+00:00

What I’m trying to do is have a 3 state tree expansion. I have

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What I’m trying to do is have a 3 state tree expansion.

I have three different icons for “expand” “collapse” “semi-expanded” which I want to use to show a partially populated tree control with all nodes initialized to semi-expanded state and then on clicking the “semi-expanded” icon it gets data from server and populates the tree and open that branch with “expanded” icon.

I tried looking for it but couldn’t find anything close to it except the 3-state checkbox but don’t know how to use it on 3 state icon when tree would only maintain 2 states.

Thanks in advance.

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1 Answer

  1. Editorial Team

    I think what you are looking for is called a lazy-loading tree. There are lots of examples your can google for, but here is a great example.

    As far as the visual part of your request goes (3 different icons to show that state of the branch or node) – you could easily handle that with a custom renderer, by looking at a flag on the node for it’s load status.

    Does that help?

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