The answer
Because of event bubbling. The child's click event bubbles up to the parent, triggering the parent's click handler. Fix: call e.stopPropagation() in the click handler to prevent bubbling.
File Explorer Common Bugs and Fixes
Why does clicking a child folder toggle the parent folder in a file explorer?
More FAQs in File Explorer Common Bugs and Fixes
Check if the folder has children before showing the expand icon and click handler: if (node.children && node.children.length > 0). Empty folders should not be clickable or show an expand icon.
Because you are not updating the icon text in the click handler. After toggling, update the icon: icon.textContent = isVisible ? closedIcon : openIcon. The icon must be updated every time the expanded state changes.
Use a scrollable container with overflow: auto so deeply nested nodes are still accessible. Consider a maximum depth with a 'show more' option. Alternatively, use lazy loading to load children on expand instead of rendering the entire tree.
Still have questions?
Browse all our FAQs or reach out to our support team
Want to upskill yourself?
Your learning library
Small steps. Big possibilities.
Find your next course. Build something great.