https://stackblitz.com/edit/kendotreeviewedit?file=index.js
i had a problem about expanding and collapsing the data on my treeview, am sharing my code with this discussion. The problem is i have child data in my treeview that not collapsing, only the parent data was working correctly. On that project Item2 is my parent data and item2.1 and item2.1.1 are my child data, that child data's expand are not working. how can i solve that issue
2 Answers, 1 is accepted
Hello,
Thank you for your example.
After inspecting it I noticed that the expand all and collapse all buttons works as expected.
I saw that only the collapsing of child nodes is not working, but this is expected because indexOf is not working on tree structures and returns -1.
I can suggest using our helper functions as this will allow the method to automatically map the expanded and collapsed items:
https://www.telerik.com/kendo-react-ui/components/treeview/expansion/update-expanded-items/#toc-using-a-helper-function
Regards,
Stefan
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