Identify when a div reaches the end of the screen using CSS

I've developed a custom dropdown feature using Vue 2 and TypeScript to meet our specific requirements (without relying on jQuery).

The dropdown functions correctly, opening the options list downwards when the main box is clicked.

One enhancement I am seeking involves dynamically adjusting the position of the options list. When the screen reaches its end, causing a scrollbar to appear or increase in height due to the dropdown, I want the options list to open upwards instead. How can I implement this functionality?

Dropdown Open & Dropdown Closed

Here is a snippet of my code:

(Insert code here)
htmlcssvue.js

Answer №1

Consider utilizing the Floating-ui library, also known as Poper

Floating UI is a sophisticated tool for positioning "floating" elements and ensuring they stay within view intelligently.

This library has been widely adopted and addresses various edge cases that may arise when implementing dropdowns from scratch.

For more information, you can explore these references:

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