React: How to shift focus using arrow keys? (TreeView)
I have found a solution to move focus within treeView.First of all you should find all your nodes inside your tree.Then you can find focused element using document.activeElement. After that, you be able to find this item within your array nodes. (document.activeElement == nodes[i]) and remember index i. To move focus using arrow keys, just add eventListener to your node and handle it.
For example, to move upward you can do something like this:
if(arrowUp) { elements[i + 1].focus() }