Drop-up submenu of vertical drop-down menu: implemented with pure CSS
For drop-down menu, transformed into drop -up menus are common, especially when the menu bar is at the bottom of the layout. To achieve this, we need to make some changes to the CSS styles.
Question: Convert drop-down menu to drop-up menu
Given drop-down menu CSS, how to modify the style so that it becomes drop -up menu?
Solution: Adjust #menu:hover ul li:hover ul rule
Can be done by adding bottom: 100%; attribute to #menu:hover ul li:hover ul rules to implement the drop-up function.
#menu:hover ul li:hover ul {
position: absolute;
margin-top: 1px;
font: 10px;
bottom: 100%;
}
Optional improvement: only apply drop-up to top-level submenus
To prevent submenus from also applying drop-up For effect, you can add the following rules:
#menu>ul>li:hover>ul {
bottom: 100%;
}
Other considerations: Restore borders
Adding the bottom: 100%; attribute may remove the border of the submenu. To restore the border, you can add the following attributes:
#menu>ul>li:hover>ul {
bottom: 100%;
border-bottom: 1px solid transparent
}
Demonstration
Here are some examples that demonstrate this technique:
- [ Demo 1](https://jsfiddle.net/W5FWW/4/)
- [Demo 2](https://jsfiddle.net/zyp6c/)
- [Demo 3](https ://jsfiddle.net/phkj20zo/)
The above is the detailed content of How to Transform a CSS Drop-Down Menu into a Drop-Up Menu?. For more information, please follow other related articles on the PHP Chinese website!
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