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Tree menu

importance: 5

Create a tree that shows/hides node children on click:

Requirements:

  • Only one event handler (use delegation)
  • A click outside the node title (on an empty space) should not do anything.

Open a sandbox for the task.

The solution has two parts.

  1. Wrap every tree node title into <span>. Then we can CSS-style them on :hover and handle clicks exactly on text, because <span> width is exactly the text width (unlike without it).
  2. Set a handler to the tree root node and handle clicks on that <span> titles.

Open the solution in a sandbox.