TreeItem.index readonly property
Get the index of the TreeItem. The index is an integer value representing the numerical position of the TreeItem among all others in the Tree, starting from 1.
Example
local ui = require "ui"
-- create a simple Window
local win = ui.Window("TreeItem.index sample", "fixed", 320, 250)
local tree = ui.Tree(win, {["Tab 1"] = {"SubItem1", "SubItem2"}, "Tab 2", "Tab 3"})
win:status()
tree:center()
function tree:onSelect(item)
win:status("TreeItem.index is "..item.index)
end
-- Launch Task to update user interface
ui.run(win):wait()