What is the best method for adjusting the z-index with relative and absolute positioning?

I'm having an issue with using the z-index property for elements with relative and absolute positioning. The

orcitMultiselectTreeviewDropdownInner
is a child div of orcitMultiselectTreeviewDropdown. While the z-index is working correctly, I encounter a problem when there is a horizontal scroll bar on the page - the position of the
orcitMultiselectTreeviewDropdownInner
div shifts. How can I ensure that the position remains fixed even when scrolling horizontally or vertically?

CSS:

.orcitMultiselectTreeviewPosition .orcitMultiselectTreeviewDropdown .orcitMultiselectTreeviewDropdownInner {
    position: relative;
    z-index:999999;
}    
.orcitMultiselectTreeviewPosition .orcitMultiselectTreeviewDropdown {
    position:absolute;
}

Answer №1

1) To stack elements on top of each other using z-index, it is essential that all parent elements of the child element with a specified z-index also have defined z-index values. Z-indexing enables the stacking of elements in a hierarchical manner, working only within the child-parent relationship regardless of which element is visually in front or behind.

2) Consider utilizing position:absolute; for both elements OR positioning the

.orcitMultiselectTreeviewDropdownInner
with properties like left:0; top:0;.

3) Experiment with applying z-index:999; to one element and z-index:99; to the other for achieving the desired layering effect.

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