amirpc amirpc - 1 year ago 148
CSS Question

twitter bootstrap dropdown popping under elements

You can see in this screenshot, the menu containing "hi" on each line is popping under body elements and also under a button on the screen.

popping under

The dom structure looks like so:

dom structure

The computed style of the dropdown element when open is:

background-color: transparent;
color: #999;
display: block;
font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
font-size: 14px;
height: 20px;
line-height: 20px;
margin-bottom: 0px;
margin-left: 0px;
margin-right: 0px;
margin-top: 0px;
overflow-x: visible;
overflow-y: visible;
position: relative;
width: 1425px;

Here is one of the items that pops "over" the dropdown menu's computed style:

box-sizing: border-box;
color: white;
cursor: pointer;
display: inline-block;
height: 22px;
line-height: 17px;
list-style-image: none;
list-style-position: outside;
list-style-type: none;
overflow-x: visible;
overflow-y: visible;
vertical-align: middle;
width: 74px;
word-spacing: 0px;

I can't seem to strike upon the right dom & css magic to make this work right. I've been playing the position in the dom heirarchy while inside the navbar of the dropdown div. I've also been playing with z-index on both the dropdown, the dropdown-menu and the elements that are popping over.

I feel a bit like there is something fundamental I'm not seeing here. Any thoughts?

Answer Source

Figured it out, the problem was I had a transform3d on the navbar:

-webkit-transform: translate3d(0, 0, 0);

Removing this fixed it. I noticed that when I removed the translate3d that the computed style of the navbar would cause the z-index to go from 0 to auto.

Not sure if this is intended behavior?

Hope this helps someone else down the line.

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